Dllcall & Sendmessage

[JohnD]

Hi everyone. I am not able to get dllcall to work with send message.

$result = DllCall("user32.dll", "int", "Sendmessage", "hwnd", $Edithwnd, "ULONG", $WM_SETTEXT, "WPARAM", 0, "LPARAM", "Hello World.")

Anyone know what I am missing here? This is for a control not in my application.

Thanks.

-JD

[Minikori]

"ULONG" should be "UINT" and the return value isn't and integer, it's an lresult (not quite sure what that is in DllCall() though)

http://msdn.microsoft.com/en-us/library/ms644950%28VS.85%29.aspx

EDIT: Oh hey 500

Edited February 23, 2010 by Minikori

[wraithdu]

What is @error returned by DllCall? I'll bet it's '3 "function" not found in the DLL file'. DllCall function names are case sensitive.

[JohnD]

What is @error returned by DllCall? I'll bet it's '3 "function" not found in the DLL file'. DllCall function names are case sensitive.

Actually, the return value is 0, indicating success. I changed ULONG to UINT but it still doesn't place the text. The constant is declared along with there being a valid window handle, so I don't know what else it could be.

$result = DllCall("user32.dll", "int", "Sendmessage", "hwnd", $Edithwnd, "UINT", $WM_SETTEXT, "WPARAM", 0, "LPARAM", "Hello World.")

[Richard Robertson]

wraithdu was talking about the value of @error.

Also, when DllCall returns 0, that's an indicator of error. DllCall returns an array on a successful call.

[JohnD]

Sorry, that wasn't clear. It is @error returning 0, not 3.

[trancexx]

Sorry, that wasn't clear. It is @error returning 0, not 3.

...sure it is

[Richard Robertson]

There is no function called "Sendmessage" in that dll. There's no way @error says 0.

[MHz]

Look at SendMessage.au3 in your include folder for some information. Perhaps just include SendMessage.au3 and use that.

Syntax

_SendMessage($hWnd, $iMsg[, $wParam = 0[, $lParam = 0[, $iReturn = 0[, $wParamType = "wparam"[, $lParamType = "lparam"[, $sReturnType = "lresult"]]]]]])

Function in SendMessage.au3

Func _SendMessage($hWnd, $iMsg, $wParam = 0, $lParam = 0, $iReturn = 0, $wParamType = "wparam", $lParamType = "lparam", $sReturnType = "lresult")
    Local $aResult = DllCall("user32.dll", $sReturnType, "SendMessageW", "hwnd", $hWnd, "uint", $iMsg, $wParamType, $wParam, $lParamType, $lParam)
    If @error Then Return SetError(@error, @extended, "")
    If $iReturn >= 0 And $iReturn <= 4 Then Return $aResult[$iReturn]
    Return $aResult
EndFunc   ;==>_SendMessage

Include it

#include <SendMessage.au3>

[JohnD]

Look at SendMessage.au3 in your include folder for some information. Perhaps just include SendMessage.au3 and use that.

Syntax

_SendMessage($hWnd, $iMsg[, $wParam = 0[, $lParam = 0[, $iReturn = 0[, $wParamType = "wparam"[, $lParamType = "lparam"[, $sReturnType = "lresult"]]]]]])

Function in SendMessage.au3

Func _SendMessage($hWnd, $iMsg, $wParam = 0, $lParam = 0, $iReturn = 0, $wParamType = "wparam", $lParamType = "lparam", $sReturnType = "lresult")
    Local $aResult = DllCall("user32.dll", $sReturnType, "SendMessageW", "hwnd", $hWnd, "uint", $iMsg, $wParamType, $wParam, $lParamType, $lParam)
    If @error Then Return SetError(@error, @extended, "")
    If $iReturn >= 0 And $iReturn <= 4 Then Return $aResult[$iReturn]
    Return $aResult
EndFunc   ;==>_SendMessage

Include it

#include <SendMessage.au3>

Thanks MHz! It took a little tinkering bc I am new to this language but I got it working. I appreciate the help.