DllCall() issues

[hgeras]

I know not much about dll's but i can realize how im goin to call one once i have the reference for it ...But i have some issues with nvcpl.dll...

From Nvidia:

NvCplGetThermalSettings()

Function Prototype

BOOL CDECL NvCplGetThermalSettings

(IN UINT nWindowsMonitorNumber,

OUT DWORD* pdwCoreTemp,

OUT DWORD* pdwAmbientTemp,

OUT DWORD* pdwUpperLimit);

Parameters In UINT nWindowsMonitorNumber -- The display number shown on

the Windows Display Properties->Settings page.

A value of 0 indicates the current primary Windows display device.

DWORD* must be a valid pointer --

pdwCoreTemp -- GPU temperature in degrees Celsius.

pdwAmbientTemp -- Ambient temperature in degrees Celsius.

pdwUpperLimit -- Upper limit of the GPU temperature specification.

Return Values True on success.

False on failure.

How am i supposed to work with pointers? I tried this:

$test=DllOpen("Nvcpl.dll")
$ret=DllCall($test,"int","NvCplGetThermalSettings","int",0,"int_ptr","","int_ptr","","int_ptr","")
if @error then MsgBox(0,"","ERROR")
MsgBox(0,"",$ret[0] & ret[1]& ret[2])

I always get "ERROR"...I have tried many variations of it and nothing seems to work...Should i use DllStruct()? And if yes how am i goin to use it in DllCall()?

Thanx in advance.

C ya

Edited August 15, 2005 by hgeras

[Manko]

Sorry to bump this thread, but since I was searching for how to read GPU temperature and found this and other outdated code, I had to come up with a solution by myself, I thought I'd share:

The part that got me stuck was that I needed to change calling convention from stdcall to cdecl, a problem I have been suffering for some time (DOH!!), like so:

$ret = DllCall($test,"int:cdecl", "NvC....

Dim $pdwCoreTemp
Dim $pdwAmbientTemp
Dim $pdwUpperLimit
$nWindowsMonitorNumber=0

$test=DllOpen("Nvcpl.dll")
$ret = DllCall($test,"int:cdecl", "NvCplGetThermalSettings", "int",$nWindowsMonitorNumber, "long*", $pdwCoreTemp, "long*", $pdwAmbientTemp, "long*", $pdwUpperLimit)
if @error then MsgBox(0,"","ERROR")
MsgBox(0,"",$ret[0] & " " & $ret[1] & " " & $ret[2])

Ofcourse knowing if you have to call with INTs or LONGs is also good.

Edited September 11, 2008 by Manko

[rover]

Sorry to bump this thread, but since I was searching for how to read GPU temperature and found this and other outdated code, I had to come up with a solution by myself, I thought I'd share:

The part that got me stuck was that I needed to change calling convention from stdcall to cdecl, a problem I have been suffering for some time (DOH!!), like so:

$ret = DllCall($test,"int:cdecl", "NvC....

Dim $pdwCoreTemp
Dim $pdwAmbientTemp
Dim $pdwUpperLimit
$nWindowsMonitorNumber=0

$test=DllOpen("Nvcpl.dll")
$ret = DllCall($test,"int:cdecl", "NvCplGetThermalSettings", "int",$nWindowsMonitorNumber, "long*", $pdwCoreTemp, "long*", $pdwAmbientTemp, "long*", $pdwUpperLimit)
if @error then MsgBox(0,"","ERROR")
MsgBox(0,"",$ret[0] & " " & $ret[1] & " " & $ret[2])

Ofcourse knowing if you have to call with INTs or LONGs is also good.

you should be able to replace $pdwCoreTemp, $pdwAmbientTemp and $pdwUpperLimit with 0 as the return array has the values

can't test it though, one of my machines has an older Nvidia card (non gaming) that doesn't report temps