_DesktopDimensions() - Details about the primary and secondary monitors.

[guinness]

I was looking at Trac on AutoIt and decided just to create this quick function which displays the number of monitors connected as well as the total width/height of all monitors. I know this is available elsewhere but felt I would contribute anyway. Thanks.

Function:

; #FUNCTION# ====================================================================================================================
; Name ..........: _DesktopDimensions
; Description ...: Returns an array containing information about the primary and virtual monitors.
; Syntax ........: _DesktopDimensions()
; Return values .: Success - Returns a 6-element array containing the following information:
;                  $aArray[0] = Total number of monitors.
;                  $aArray[1] = Width of the primary monitor.
;                  $aArray[2] = Height of the primary monitor.
;                  $aArray[3] = Total width of the desktop including the width of multiple monitors. Note: If no secondary monitor this will be the same as $aArray[2].
;                  $aArray[4] = Total height of the desktop including the height of multiple monitors. Note: If no secondary monitor this will be the same as $aArray[3].
; Author ........: guinness
; Remarks .......: WinAPI.au3 must be included i.e. #include <WinAPI.au3>
; Related .......: @DesktopWidth, @DesktopHeight, _WinAPI_GetSystemMetrics
; Example .......: Yes
; ===============================================================================================================================
Func _DesktopDimensions()
    Local $aReturn = [_WinAPI_GetSystemMetrics($SM_CMONITORS), _ ; Number of monitors.
            _WinAPI_GetSystemMetrics($SM_CXSCREEN), _ ; Width or Primary monitor.
            _WinAPI_GetSystemMetrics($SM_CYSCREEN), _ ; Height or Primary monitor.
            _WinAPI_GetSystemMetrics($SM_CXVIRTUALSCREEN), _ ; Width of the Virtual screen.
            _WinAPI_GetSystemMetrics($SM_CYVIRTUALSCREEN)] ; Height of the Virtual screen.
    Return $aReturn
EndFunc   ;==>_DesktopDimensions

Example use of Function:

#include <WinAPI.au3>
#include <WindowsConstants.au3>

Local $aScreenResolution = _DesktopDimensions()
MsgBox($MB_SYSTEMMODAL, '', 'Example of _DesktopDimensions:' & @CRLF & _
        'Number of monitors = ' & $aScreenResolution[0] & @CRLF & _
        'Primary Width = ' & $aScreenResolution[1] & @CRLF & _
        'Primary Height = ' & $aScreenResolution[2] & @CRLF & _
        'Secondary Width = ' & $aScreenResolution[3] & @CRLF & _
        'Secondary Height = ' & $aScreenResolution[4] & @CRLF)

Edited June 20, 2014 by guinness

[martin]

It would be good if you could give information on the sizes and positions of any secondary monitors.

[guinness]

I tried SM_XVIRTUALSCREEN & SM_YVIRTUALSCREEN but this didn't work when I tested it. Just returned 0, 0.

[JScript]

Very useful, thanks!

João Carlos.

[martin]

I tried SM_XVIRTUALSCREEN & SM_YVIRTUALSCREEN but this didn't work when I tested it. Just returned 0, 0.

0,0 could be correct. I think you need to investigate EnumDisplayMonitors.

[guinness]

0,0 could be correct. I think you need to investigate EnumDisplayMonitors.

I started to look at that yesterday but I got a little sidetracked.Thanks for reminding me.

Edit: This isn't a quick 5 minute function as I first thought so I will need some more time to study the best approach of using EnumDisplayMonitors.

Edited November 6, 2011 by guinness

[Zedna]

Edit: This isn't a quick 5 minute function as I first thought so I will need some more time to study the best approach of using EnumDisplayMonitors.

Here is example for EnumDisplayMonitors

EDIT: But this post is rather old so there may be some incompatibility with latest Autoit version or datatypes.

EDIT2: I saw some scripts using WMI with Win32_DesktopMonitor also.

Edited November 7, 2011 by Zedna

[guinness]

Thanks Zedna. The first link I tried just to get an idea and it did give me an insight into the function.

I will delve more into Win32_DesktopMonitor later on today as it was something I did come across and looking at MSDN is something which is easy to implement.

[guinness]

Example using WMI: (Thanks to Zedna & martin for pointing out alternatives.)

#include <Array.au3>

Local $aScreenResolution

$aScreenResolution = _GetActiveMonitors()
For $A = 1 To $aScreenResolution[0][0]
    ConsoleWrite("Monitor " & $A & ":" & @CRLF & _
            "Width = " & $aScreenResolution[$A][0] & @CRLF & _
            "Height = " & $aScreenResolution[$A][1] & @CRLF & @CRLF)
Next

Func _GetActiveMonitors()
    Local $aError[2][2] = [[1, 2],[@DesktopWidth, @DesktopHeight]], $aReturn[1][2] = [[0, 2]], $iDimension = 0, $oColItems, $oWMIService

    $oWMIService = ObjGet("winmgmts:.rootCIMV2")
    $oColItems = $oWMIService.ExecQuery("SELECT * FROM Win32_DesktopMonitor Where Availability='3'", "WQL", 0x30)

    If IsObj($oColItems) Then
        For $oObjItem In $oColItems
            If ($aReturn[0][0] + 1) >= $iDimension Then
                $iDimension = ($aReturn[0][0] + 1) * 2
                ReDim $aReturn[$iDimension][$aReturn[0][1]]
            EndIf
            $aReturn[0][0] += 1
            $aReturn[$aReturn[0][0]][0] = $oObjItem.ScreenHeight
            $aReturn[$aReturn[0][0]][1] = $oObjItem.ScreenWidth
        Next
        ReDim $aReturn[$aReturn[0][0] + 1][$aReturn[0][1]]
        $aReturn[0][1] = ""
        Return $aReturn
    EndIf
    Return SetError(1, 0, $aError)
EndFunc   ;==>_GetActiveMonitors

Edited November 7, 2011 by guinness

[UEZ]

I tried also the WMI variant but it shows me only one monitor although I've two of them in my office. Desktop is extented to both of them.

I found a link in MSDN and trying to get it run properly but there is something wrong with it.

#include <array.au3>
#include <winapi.au3>

Global Const $MONITOR_DEFAULTTONULL = 0x00000000
Global Const $MONITOR_DEFAULTTOPRIMARY = 0x00000001
Global Const $MONITOR_DEFAULTTONEAREST = 0x00000002
Global Const $MONITORINFOF_PRIMARY = 0x00000001

Global Const $RECT = "LONG left;LONG top;LONG right;LONG bottom"

;http://msdn.microsoft.com/en-us/library/windows/desktop/dd145065(v=vs.85).aspx
Global Const $MONITORINFO = "DWORD cbSize;LONG rcMonitor[4];LONG rcWork[4];DWORD dwFlags"

;~ Global $struct_rcMonitor =  DllStructCreate($RECT)
;~ Global $struct_rcWork =  DllStructCreate($RECT)
Global $struct_MONITORINFO = DllStructCreate($MONITORINFO)

;~ DllStructSetData($struct_rcMonitor, "rcMonitor", DllStructGetPtr($struct_rcMonitor))
;~ DllStructSetData($struct_rcWork, "rcWork", DllStructGetPtr($struct_rcWork))
DllStructSetData($struct_MONITORINFO, "dwFlags", $MONITORINFOF_PRIMARY)
DllStructSetData($struct_MONITORINFO, "cbSize", DllStructGetSize($struct_MONITORINFO))

Global $ptrMONITORINFO  = DllStructGetPtr($struct_MONITORINFO)

ConsoleWrite(GetMonitorInfo(_WinAPI_GetDC(0), $ptrMONITORINFO) & @LF)

Func GetMonitorInfo($hMonitor, $pLPMI) ;http://msdn.microsoft.com/en-us/library/windows/desktop/dd144901(v=vs.85).aspx
    Local $aRes = DllCall ("user32.dll",    "int", "GetMonitorInfo", "hwnd", $hMonitor, "ptr", $pLPMI)
    Return $aRes[0]
EndFunc

Further I don't know whether this will get the information which is needed.

Newbie on this section...

Br,

UEZ

MultiMon.h

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//=============================================================================
//
// multimon.h -- Stub module that fakes multiple monitor apis on Win32 OSes
//             without them.
//
// By using this header your code will get back default values from
// GetSystemMetrics() for new metrics, and the new multimonitor APIs
// will act like only one display is present on a Win32 OS without
// multimonitor APIs.
//
// Exactly one source must include this with COMPILE_MULTIMON_STUBS defined.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//=============================================================================

#ifdef __cplusplus
extern "C" {            // Assume C declarations for C++
#endif // __cplusplus

//
// If we are building with Win95/NT4 headers, we need to declare
// the multimonitor-related metrics and APIs ourselves.
//
#ifndef SM_CMONITORS

#define SM_XVIRTUALSCREEN      76
#define SM_YVIRTUALSCREEN      77
#define SM_CXVIRTUALSCREEN    78
#define SM_CYVIRTUALSCREEN    79
#define SM_CMONITORS            80
#define SM_SAMEDISPLAYFORMAT    81

// HMONITOR is already declared if WINVER >= 0x0500 in windef.h
// This is for components built with an older version number.
//
#if !defined(HMONITOR_DECLARED) && (WINVER < 0x0500)
DECLARE_HANDLE(HMONITOR);
#define HMONITOR_DECLARED
#endif

#define MONITOR_DEFAULTTONULL      0x00000000
#define MONITOR_DEFAULTTOPRIMARY    0x00000001
#define MONITOR_DEFAULTTONEAREST    0x00000002

#define MONITORINFOF_PRIMARY        0x00000001

typedef struct tagMONITORINFO
{
    DWORD   cbSize;
    RECT    rcMonitor;
    RECT    rcWork;
    DWORD   dwFlags;
} MONITORINFO, *LPMONITORINFO;

#ifndef CCHDEVICENAME
#define CCHDEVICENAME 32
#endif

#ifdef __cplusplus
typedef struct tagMONITORINFOEXA : public tagMONITORINFO
{
    CHAR        szDevice[CCHDEVICENAME];
} MONITORINFOEXA, *LPMONITORINFOEXA;
typedef struct tagMONITORINFOEXW : public tagMONITORINFO
{
    WCHAR      szDevice[CCHDEVICENAME];
} MONITORINFOEXW, *LPMONITORINFOEXW;
#ifdef UNICODE
typedef MONITORINFOEXW MONITORINFOEX;
typedef LPMONITORINFOEXW LPMONITORINFOEX;
#else
typedef MONITORINFOEXA MONITORINFOEX;
typedef LPMONITORINFOEXA LPMONITORINFOEX;
#endif // UNICODE
#else // ndef __cplusplus
typedef struct tagMONITORINFOEXA
{
    MONITORINFO;
    CHAR        szDevice[CCHDEVICENAME];
} MONITORINFOEXA, *LPMONITORINFOEXA;
typedef struct tagMONITORINFOEXW
{
    MONITORINFO;
    WCHAR      szDevice[CCHDEVICENAME];
} MONITORINFOEXW, *LPMONITORINFOEXW;
#ifdef UNICODE
typedef MONITORINFOEXW MONITORINFOEX;
typedef LPMONITORINFOEXW LPMONITORINFOEX;
#else
typedef MONITORINFOEXA MONITORINFOEX;
typedef LPMONITORINFOEXA LPMONITORINFOEX;
#endif // UNICODE
#endif

typedef BOOL (CALLBACK* MONITORENUMPROC)(HMONITOR, HDC, LPRECT, LPARAM);

#ifndef DISPLAY_DEVICE_ATTACHED_TO_DESKTOP
typedef struct _DISPLAY_DEVICEA {
    DWORD  cb;
    CHAR   DeviceName[32];
    CHAR   DeviceString[128];
    DWORD  StateFlags;
    CHAR   DeviceID[128];
    CHAR   DeviceKey[128];
} DISPLAY_DEVICEA, *PDISPLAY_DEVICEA, *LPDISPLAY_DEVICEA;
typedef struct _DISPLAY_DEVICEW {
    DWORD  cb;
    WCHAR  DeviceName[32];
    WCHAR  DeviceString[128];
    DWORD  StateFlags;
    WCHAR  DeviceID[128];
    WCHAR  DeviceKey[128];
} DISPLAY_DEVICEW, *PDISPLAY_DEVICEW, *LPDISPLAY_DEVICEW;
#ifdef UNICODE
typedef DISPLAY_DEVICEW DISPLAY_DEVICE;
typedef PDISPLAY_DEVICEW PDISPLAY_DEVICE;
typedef LPDISPLAY_DEVICEW LPDISPLAY_DEVICE;
#else
typedef DISPLAY_DEVICEA DISPLAY_DEVICE;
typedef PDISPLAY_DEVICEA PDISPLAY_DEVICE;
typedef LPDISPLAY_DEVICEA LPDISPLAY_DEVICE;
#endif // UNICODE

#define DISPLAY_DEVICE_ATTACHED_TO_DESKTOP 0x00000001
#define DISPLAY_DEVICE_MULTI_DRIVER     0x00000002
#define DISPLAY_DEVICE_PRIMARY_DEVICE     0x00000004
#define DISPLAY_DEVICE_MIRRORING_DRIVER 0x00000008
#define DISPLAY_DEVICE_VGA_COMPATIBLE     0x00000010
#endif

#endif  // SM_CMONITORS

#undef GetMonitorInfo
#undef GetSystemMetrics
#undef MonitorFromWindow
#undef MonitorFromRect
#undef MonitorFromPoint
#undef EnumDisplayMonitors
#undef EnumDisplayDevices

//
// Define COMPILE_MULTIMON_STUBS to compile the stubs;
// otherwise, you get the declarations.
//
#ifdef COMPILE_MULTIMON_STUBS

//-----------------------------------------------------------------------------
//
// Implement the API stubs.
//
//-----------------------------------------------------------------------------

#ifndef _MULTIMON_USE_SECURE_CRT
#if defined(__GOT_SECURE_LIB__) && __GOT_SECURE_LIB__ >= 200402L
#define _MULTIMON_USE_SECURE_CRT 1
#else
#define _MULTIMON_USE_SECURE_CRT 0
#endif
#endif

#ifndef MULTIMON_FNS_DEFINED

int   (WINAPI* g_pfnGetSystemMetrics)(int) = NULL;
HMONITOR (WINAPI* g_pfnMonitorFromWindow)(HWND, DWORD) = NULL;
HMONITOR (WINAPI* g_pfnMonitorFromRect)(LPCRECT, DWORD) = NULL;
HMONITOR (WINAPI* g_pfnMonitorFromPoint)(POINT, DWORD) = NULL;
BOOL     (WINAPI* g_pfnGetMonitorInfo)(HMONITOR, LPMONITORINFO) = NULL;
BOOL     (WINAPI* g_pfnEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM) = NULL;
BOOL     (WINAPI* g_pfnEnumDisplayDevices)(PVOID, DWORD, PDISPLAY_DEVICE,DWORD) = NULL;
BOOL     g_fMultiMonInitDone = FALSE;
BOOL     g_fMultimonPlatformNT = FALSE;

#endif

BOOL IsPlatformNT()
{
    OSVERSIONINFOA osvi = {0};
    osvi.dwOSVersionInfoSize = sizeof(osvi);
    GetVersionExA((OSVERSIONINFOA*)&osvi);
    return (VER_PLATFORM_WIN32_NT == osvi.dwPlatformId);    
}

BOOL InitMultipleMonitorStubs(void)
{
    HMODULE hUser32;
    if (g_fMultiMonInitDone)
    {
        return g_pfnGetMonitorInfo != NULL;
    }

    g_fMultimonPlatformNT = IsPlatformNT();
    hUser32 = GetModuleHandle(TEXT("USER32"));
    if (hUser32 &&
        (*(FARPROC*)&g_pfnGetSystemMetrics  = GetProcAddress(hUser32,"GetSystemMetrics")) != NULL &&
        (*(FARPROC*)&g_pfnMonitorFromWindow   = GetProcAddress(hUser32,"MonitorFromWindow")) != NULL &&
        (*(FARPROC*)&g_pfnMonitorFromRect    = GetProcAddress(hUser32,"MonitorFromRect")) != NULL &&
        (*(FARPROC*)&g_pfnMonitorFromPoint  = GetProcAddress(hUser32,"MonitorFromPoint")) != NULL &&
        (*(FARPROC*)&g_pfnEnumDisplayMonitors = GetProcAddress(hUser32,"EnumDisplayMonitors")) != NULL &&
#ifdef UNICODE
        (*(FARPROC*)&g_pfnEnumDisplayDevices  = GetProcAddress(hUser32,"EnumDisplayDevicesW")) != NULL &&
        (*(FARPROC*)&g_pfnGetMonitorInfo      = g_fMultimonPlatformNT ? GetProcAddress(hUser32,"GetMonitorInfoW") :
                                                GetProcAddress(hUser32,"GetMonitorInfoA")) != NULL
#else
        (*(FARPROC*)&g_pfnGetMonitorInfo      = GetProcAddress(hUser32,"GetMonitorInfoA")) != NULL &&
        (*(FARPROC*)&g_pfnEnumDisplayDevices  = GetProcAddress(hUser32,"EnumDisplayDevicesA")) != NULL
#endif
    ) {
        g_fMultiMonInitDone = TRUE;
        return TRUE;
    }
    else
    {
        g_pfnGetSystemMetrics   = NULL;
        g_pfnMonitorFromWindow   = NULL;
        g_pfnMonitorFromRect     = NULL;
        g_pfnMonitorFromPoint   = NULL;
        g_pfnGetMonitorInfo   = NULL;
        g_pfnEnumDisplayMonitors = NULL;
        g_pfnEnumDisplayDevices  = NULL;

        g_fMultiMonInitDone = TRUE;
        return FALSE;
    }
}

//-----------------------------------------------------------------------------
//
// fake implementations of Monitor APIs that work with the primary display
// no special parameter validation is made since these run in client code
//
//-----------------------------------------------------------------------------

int WINAPI
xGetSystemMetrics(int nIndex)
{
    if (InitMultipleMonitorStubs())
        return g_pfnGetSystemMetrics(nIndex);

    switch (nIndex)
    {
    case SM_CMONITORS:
    case SM_SAMEDISPLAYFORMAT:
        return 1;

    case SM_XVIRTUALSCREEN:
    case SM_YVIRTUALSCREEN:
        return 0;

    case SM_CXVIRTUALSCREEN:
        nIndex = SM_CXSCREEN;
        break;

    case SM_CYVIRTUALSCREEN:
        nIndex = SM_CYSCREEN;
        break;
    }

    return GetSystemMetrics(nIndex);
}

#define xPRIMARY_MONITOR ((HMONITOR)0x12340042)

HMONITOR WINAPI
xMonitorFromPoint(POINT ptScreenCoords, DWORD dwFlags)
{
    if (InitMultipleMonitorStubs())
        return g_pfnMonitorFromPoint(ptScreenCoords, dwFlags);

    if ((dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
        ((ptScreenCoords.x >= 0) &&
        (ptScreenCoords.x < GetSystemMetrics(SM_CXSCREEN)) &&
        (ptScreenCoords.y >= 0) &&
        (ptScreenCoords.y < GetSystemMetrics(SM_CYSCREEN))))
    {
        return xPRIMARY_MONITOR;
    }

    return NULL;
}

HMONITOR WINAPI
xMonitorFromRect(LPCRECT lprcScreenCoords, DWORD dwFlags)
{
    if (InitMultipleMonitorStubs())
        return g_pfnMonitorFromRect(lprcScreenCoords, dwFlags);

    if ((dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
        ((lprcScreenCoords->right > 0) &&
        (lprcScreenCoords->bottom > 0) &&
        (lprcScreenCoords->left < GetSystemMetrics(SM_CXSCREEN)) &&
        (lprcScreenCoords->top < GetSystemMetrics(SM_CYSCREEN))))
    {
        return xPRIMARY_MONITOR;
    }

    return NULL;
}

HMONITOR WINAPI
xMonitorFromWindow(HWND hWnd, DWORD dwFlags)
{
    WINDOWPLACEMENT wp;

    if (InitMultipleMonitorStubs())
        return g_pfnMonitorFromWindow(hWnd, dwFlags);

    if (dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST))
        return xPRIMARY_MONITOR;

    if (IsIconic(hWnd) ?
            GetWindowPlacement(hWnd, &wp) :
            GetWindowRect(hWnd, &wp.rcNormalPosition)) {

        return xMonitorFromRect(&wp.rcNormalPosition, dwFlags);
    }

    return NULL;
}

BOOL WINAPI
xGetMonitorInfo(HMONITOR hMonitor, __inout LPMONITORINFO lpMonitorInfo)
{
    RECT rcWork;

    if (InitMultipleMonitorStubs())
    {
        BOOL f = g_pfnGetMonitorInfo(hMonitor, lpMonitorInfo);
#ifdef UNICODE
        if (f && !g_fMultimonPlatformNT && (lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX)))
        {
            MultiByteToWideChar(CP_ACP, 0,
                (LPSTR)((MONITORINFOEX*)lpMonitorInfo)->szDevice, -1,
                ((MONITORINFOEX*)lpMonitorInfo)->szDevice, (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
        }
#endif
        return f;
    }

    if ((hMonitor == xPRIMARY_MONITOR) &&
        lpMonitorInfo &&
        (lpMonitorInfo->cbSize >= sizeof(MONITORINFO)) &&
        SystemParametersInfoA(SPI_GETWORKAREA, 0, &rcWork, 0))
    {
        lpMonitorInfo->rcMonitor.left = 0;
        lpMonitorInfo->rcMonitor.top  = 0;
        lpMonitorInfo->rcMonitor.right  = GetSystemMetrics(SM_CXSCREEN);
        lpMonitorInfo->rcMonitor.bottom = GetSystemMetrics(SM_CYSCREEN);
        lpMonitorInfo->rcWork = rcWork;
        lpMonitorInfo->dwFlags = MONITORINFOF_PRIMARY;

        if (lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX))
        {
#ifdef UNICODE
            MultiByteToWideChar(CP_ACP, 0, "DISPLAY", -1, ((MONITORINFOEX*)lpMonitorInfo)->szDevice, (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
#else // UNICODE
#if _MULTIMON_USE_SECURE_CRT
            strncpy_s(((MONITORINFOEX*)lpMonitorInfo)->szDevice, (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)), TEXT("DISPLAY"), (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)) - 1);
#else
            lstrcpyn(((MONITORINFOEX*)lpMonitorInfo)->szDevice, TEXT("DISPLAY"), (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
#endif // _MULTIMON_USE_SECURE_CRT
#endif // UNICODE
        }

        return TRUE;
    }

    return FALSE;
}

BOOL WINAPI
xEnumDisplayMonitors(
        HDC          hdcOptionalForPainting,
        LPCRECT      lprcEnumMonitorsThatIntersect,
        MONITORENUMPROC lpfnEnumProc,
        LPARAM        dwData)
{
    RECT rcLimit;

    if (InitMultipleMonitorStubs()) {
        return g_pfnEnumDisplayMonitors(
                hdcOptionalForPainting,
                lprcEnumMonitorsThatIntersect,
                lpfnEnumProc,
                dwData);
    }

    if (!lpfnEnumProc)
        return FALSE;

    rcLimit.left   = 0;
    rcLimit.top = 0;
    rcLimit.right  = GetSystemMetrics(SM_CXSCREEN);
    rcLimit.bottom = GetSystemMetrics(SM_CYSCREEN);

    if (hdcOptionalForPainting)
    {
        RECT    rcClip;
        POINT   ptOrg;

        switch (GetClipBox(hdcOptionalForPainting, &rcClip))
        {
        default:
            if (!GetDCOrgEx(hdcOptionalForPainting, &ptOrg))
                return FALSE;

            OffsetRect(&rcLimit, -ptOrg.x, -ptOrg.y);
            if (IntersectRect(&rcLimit, &rcLimit, &rcClip) &&
                (!lprcEnumMonitorsThatIntersect ||
                     IntersectRect(&rcLimit, &rcLimit, lprcEnumMonitorsThatIntersect))) {

                break;
            }
            //fall thru
        case NULLREGION:
             return TRUE;
        case ERROR:
             return FALSE;
        }
    } else {
        if (    lprcEnumMonitorsThatIntersect &&
                !IntersectRect(&rcLimit, &rcLimit, lprcEnumMonitorsThatIntersect)) {

            return TRUE;
        }
    }

    return lpfnEnumProc(
            xPRIMARY_MONITOR,
            hdcOptionalForPainting,
            &rcLimit,
            dwData);
}

BOOL WINAPI
xEnumDisplayDevices(
    PVOID Unused,
    DWORD iDevNum,
    __inout PDISPLAY_DEVICE lpDisplayDevice,
    DWORD dwFlags)
{
    if (InitMultipleMonitorStubs())
        return g_pfnEnumDisplayDevices(Unused, iDevNum, lpDisplayDevice, dwFlags);

    if (Unused != NULL)
        return FALSE;

    if (iDevNum != 0)
        return FALSE;

    if (lpDisplayDevice == NULL || lpDisplayDevice->cb < sizeof(DISPLAY_DEVICE))
        return FALSE;

#ifdef UNICODE
    MultiByteToWideChar(CP_ACP, 0, "DISPLAY", -1, lpDisplayDevice->DeviceName, (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)));
    MultiByteToWideChar(CP_ACP, 0, "DISPLAY", -1, lpDisplayDevice->DeviceString, (sizeof(lpDisplayDevice->DeviceString)/sizeof(TCHAR)));
#else // UNICODE
#if _MULTIMON_USE_SECURE_CRT
    strncpy_s((LPTSTR)lpDisplayDevice->DeviceName, (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)), TEXT("DISPLAY"), (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)) - 1);
    strncpy_s((LPTSTR)lpDisplayDevice->DeviceString, (sizeof(lpDisplayDevice->DeviceString)/sizeof(TCHAR)), TEXT("DISPLAY"), (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)) - 1);
#else
    lstrcpyn((LPTSTR)lpDisplayDevice->DeviceName,   TEXT("DISPLAY"), (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)));
    lstrcpyn((LPTSTR)lpDisplayDevice->DeviceString, TEXT("DISPLAY"), (sizeof(lpDisplayDevice->DeviceString)/sizeof(TCHAR)));
#endif // _MULTIMON_USE_SECURE_CRT
#endif // UNICODE

    lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ATTACHED_TO_DESKTOP | DISPLAY_DEVICE_PRIMARY_DEVICE;

    return TRUE;
}

#undef xPRIMARY_MONITOR
#undef COMPILE_MULTIMON_STUBS

#else   // COMPILE_MULTIMON_STUBS

extern int  WINAPI xGetSystemMetrics(int);
extern HMONITOR WINAPI xMonitorFromWindow(HWND, DWORD);
extern HMONITOR WINAPI xMonitorFromRect(LPCRECT, DWORD);
extern HMONITOR WINAPI xMonitorFromPoint(POINT, DWORD);
extern BOOL WINAPI xGetMonitorInfo(HMONITOR, LPMONITORINFO);
extern BOOL WINAPI xEnumDisplayMonitors(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
extern BOOL WINAPI xEnumDisplayDevices(PVOID, DWORD, PDISPLAY_DEVICE, DWORD);

#endif  // COMPILE_MULTIMON_STUBS

//
// build defines that replace the regular APIs with our versions
//
#define GetSystemMetrics    xGetSystemMetrics
#define MonitorFromWindow   xMonitorFromWindow
#define MonitorFromRect  xMonitorFromRect
#define MonitorFromPoint    xMonitorFromPoint
#define GetMonitorInfo    xGetMonitorInfo
#define EnumDisplayMonitors xEnumDisplayMonitors
#define EnumDisplayDevices  xEnumDisplayDevices

#ifdef __cplusplus
}
#endif  // __cplusplus

</winapi.au3></array.au3> Edited November 8, 2011 by UEZ

[guinness]

Newbie on this section...

Thanks UEZ, honestly you and me both.

[KaFu]

This also contains tons of useful infos.

[guinness]

Thanks KaFu. I will have a look tomorrow and see if it works.

[martin]

@UEZ,

Your dllstructcreate will fail because "RECT" is not a known data type.Try using "long rcMonitor[4];" instead and comment out the lines

;DllStructSetData($MONITORINFO, "rcMonitor", DllStructGetPtr($struct_rcMonitor))

;DllStructSetData($MONITORINFO, "rcWork", DllStructGetPtr($struct_rcWork))

Also structs should not have a semicolon at the end of all the elements I don't think.

and then you have used $MONITORINFO when you meant to use $struct_MONITORINFO in one place.

The last problem I can see is you need to use "hwnd" instead of "handle" in the call to GetMonitorInfo.

(I think trancexx has a udf somewhere which lets you add a struct inside a struct.)

Edited November 8, 2011 by martin

[UEZ]

@martin: thanks for the information but it seems still not to work properly!

I have to work more on the WinAPI stuff to get more knowledge how to utilize the information from MSDN properly in AutoIt.

Update the code from above.

Br,

UEZ

[martin]

@martin: thanks for the information but it seems still not to work properly!

I have to work more on the WinAPI stuff to get more knowledge how to utilize the information from MSDN properly in AutoIt.

Br,

UEZ

Wideboydixon showed maybe it will help.

[Ascend4nt]

Regarding issues with calling GetMonitorInfo - let me save you the trouble. I pulled the below functions from one of the UDF's I was using to enhanced my Full-Screen Crash Recovery thing.. there's more to it than this (multi-monitor info, power-toggling) but I hadn't thought to release it as a UDF..

expandcollapse popup

#include <WinAPI.au3>
; ===================================================================================================================
; Func _GraphicsCreateDC($sDriver="DISPLAY",$sDevice=0,$pInitData=0)
;
; Function to create a Device Context. With default parameters, it will create a DC covering ALL monitors, rather
;    than getting only the default monitor with GetDC(0)
;    *NOTE: When done with the DC, must use DeleteDC on the returned DC (whereas GetDC uses ReleaseDC)
;
; Author: Ascend4nt
; ===================================================================================================================

Func _GraphicsCreateDC($sDriver="DISPLAY",$sDevice=0,$pInitData=0)
    If Not IsString($sDriver) Then Return SetError(1,0,False)
    Local $aRet,$sDeviceType
    If $sDevice="" Or Not IsString($sDevice) Then
        $sDeviceType="ptr"
        $sDevice=0
    Else
        $sDeviceType="wstr"
    EndIf
    $aRet=DllCall('gdi32.dll',"handle","CreateDCW","wstr",$sDriver,$sDeviceType,$sDevice,"ptr",0,"ptr",$pInitData)
    If @error Then Return SetError(2,@error,0)
    If $aRet[0]=0 Then Return SetError(3,0,0)
    Return $aRet[0]
EndFunc

; ==========================================================================================================================
; Func _MonitorGetInfo($hMonitor,$hMonitorDC=0)
;
; Gets information about a monitor (given a monitor handle).
;
; $hMonitor = Handle to Monitor
; $hMonitorDC = Optional Monitor DC
;
; Returns:
;    Success: 10-element array, with @error=0:
;        $array[0]  = Monitor  upper-left corner X coordinate (this rect is same as full-screen size)
;        $array[1]  = Monitor  upper-left corner Y coordinate
;        $array[2]  = Monitor lower-right corner X coordinate
;        $array[3]  = Monitor lower-right corner Y coordinate
;        $array[4]  = Monitor Work Area  upper-left corner X coordinate (this rect is same as maximized size)
;        $array[5]  = Monitor Work Area  upper-left corner Y coordinate
;        $array[6]  = Monitor Work Area lower-right corner X coordinate
;        $array[7]  = Monitor Work Area lower-right corner Y coordinate
;        $array[8]  = Primary monitor boolean (0 = not, 1 = is)
;        $array[9]  = Monitor Or Display Device Name (usually '.DISPLAY#' where # starts at 1)
;        $array[10] = Bits Per Pixel
;        $array[11] = Vertical Refresh Rate
;    Failure: '' with @error set:
;        @error = 1 = invalid parameter
;        @error = 2 = DLLCall() error, with @extended set to DLLCall() error code (see AutoIt Help)
;        @error = 3 = API call failed
;
; Author: Ascend4nt
; ==========================================================================================================================

Func _MonitorGetInfo($hMonitor,$hMonitorDC=0)
    If Not IsPtr($hMonitor) Or $hMonitor=0 Then Return SetError(1,0,'')
    ; cbSize, rcMonitor (virtual rect of monitor), rcWork (maximized state of window [minus taskbar, sidebar etc]), dwFlags
    Local $aRet,$stMonInfoEx=DllStructCreate('dword;long[8];dword;wchar[32]'),$bMonDCCreated=0
    DllStructSetData($stMonInfoEx,1,DllStructGetSize($stMonInfoEx))        ; set cbSize
    $aRet=DllCall('user32.dll','bool','GetMonitorInfoW','handle',$hMonitor,'ptr',DllStructGetPtr($stMonInfoEx))
    If @error Then Return SetError(2,0,'')
    If Not $aRet[0] Then Return SetError(3,0,'')
    Dim $aRet[12]
    ; Both RECT's
    For $i=0 To 7
        $aRet[$i]=DllStructGetData($stMonInfoEx,2,$i+1)
    Next
    ; 0 or 1 for Primary Monitor [MONITORINFOF_PRIMARY = 1]
    $aRet[8]=DllStructGetData($stMonInfoEx,3)
    ; Device String of type '.DISPLAY1' etc
    $aRet[9]=DllStructGetData($stMonInfoEx,4)
    If $hMonitorDC=0 Then
        $hMonitorDC=_GraphicsCreateDC($aRet[9],$aRet[9])
        $bMonDCCreated=1
    EndIf
    $aRet[10]=_WinAPI_GetDeviceCaps($hMonitorDC,12)    ; Bits-Per-Pixel
    $aRet[11]=_WinAPI_GetDeviceCaps($hMonitorDC,116)    ; Vertical Refresh Rate (Hz)
    If $bMonDCCreated Then _WinAPI_DeleteDC($hMonitorDC)
;~     ConsoleWrite("BitsPerPixel="&$aRet[10]&", Refresh Rate="&$aRet[11]&" Hz"&@CRLF)
    Return $aRet
EndFunc

; ==========================================================================================================================
; Func _MonitorFromWindow($hWnd,$iFlags=2)
;
; Gets monitor handle based on Window handle
;
; $iFlags: 0-2:  (if window doesn't 'intersect' any monitor [i.e. - its off-screen])
;    MONITOR_DEFAULTTONULL (0)
;    MONITOR_DEFAULTTOPRIMARY (1)
;    MONITOR_DEFAULTTONEAREST (2)
;
; Author: Ascend4nt
; ==========================================================================================================================

Func _MonitorFromWindow($hWnd,$iFlags=2)
    If Not IsHWnd($hWnd) Or $iFlags<0 Or $iFlags>2 Then Return SetError(1,0,0)
    Local $aRet=DllCall('user32.dll','handle','MonitorFromWindow','hwnd',$hWnd,'dword',$iFlags)
    If @error Then Return SetError(2,@error,0)
    If $aRet[0]=0 Then Return SetError(3,0,0)
    Return $aRet[0]
EndFunc

; TEST CODE

#include <Array.au3>
$hWnd=WinGetHandle('[CLASS:Shell_TrayWnd]')
$hMonitor=_MonitorFromWindow($hWnd)
$aMonInfo=_MonitorGetInfo($hMonitor)

$aMonInfo[8]="Primary? = "&$aMonInfo[8]&" (0=no,1=yes)"
$aMonInfo[10]&=" bpp"
$aMonInfo[11]="Refresh Rate: "&$aMonInfo[11]&" Hz"

_ArrayDisplay($aMonInfo,"Start Menu Bar ("&$hWnd&")")

[UEZ]

@Ascend4nt: nice function!

Br,

UEZ

[guinness]

Thanks Ascend4nt. I will test tomorrow.

[guinness]

Tidied up the example by removing the usage of magic numbers.