Flush the GDIplus buffer?

[malu05]

I am making a tool to capture the depth buffer in World of Warcraft, and for that i use the screencapture function.

I manage to capture 57 bitmaps, then the app crashes with a windows buffer overflow error (buffer for creating BITMAPS).

How do i flush the buffer?

Do i have to restart GDIplus after each operation or is there another fancy way?

expandcollapse popup

for $i = 1 to 100 step + 1
disable()
sleep($interval)
$hBitmap = _ScreenCapture_Capture('', 0, 0, 1280, 720, False)
__ScreenCapture_SaveImage($sFile & "Z-buf"& $i & ".jpg", $hBitmap, False, $iQuality)
sleep(10)
enable()
sleep($interval)
$hBitmap = _ScreenCapture_Capture('', 0, 0, 1280, 720, False)
__ScreenCapture_SaveImage($sFile &  "Difu"& $i & ".jpg", $hBitmap, False, $iQuality)
sleep(10)
sleep($interval)
next

...



Func __ScreenCapture_SaveImage($sFileName, $hBitmap, $fFreeBmp, $iQuality)
    Local $hClone, $sCLSID, $tData, $sExt, $hImage, $pParams, $tParams, $iResult, $iX, $iY

    If @error Then Return SetError(-1, -1, False)

    $sExt = StringUpper(_GDIPlus_ExtractFileExt($sFileName))
    $sCLSID = _GDIPlus_EncodersGetCLSID($sExt)
    If $sCLSID = "" Then Return SetError(-2, -2, False)
    $hImage = _GDIPlus_BitmapCreateFromHBITMAP($hBitmap)
    If @error Then Return SetError(-3, -3, False)

    Switch $sExt
        Case "BMP"
            $iX = _GDIPlus_ImageGetWidth($hImage)
            $iY = _GDIPlus_ImageGetHeight($hImage)
            $hClone = _GDIPlus_BitmapCloneArea($hImage, 0, 0, $iX, $iY, $giBMPFormat)
            _GDIPlus_ImageDispose($hImage)
            $hImage = $hClone
        Case "JPG", "JPEG"
            $tParams = _GDIPlus_ParamInit(1)
            $tData = DllStructCreate("int Quality")
            DllStructSetData($tData, "Quality", $iQuality)
            _GDIPlus_ParamAdd($tParams, $GDIP_EPGQUALITY, 1, $GDIP_EPTLONG, DllStructGetPtr($tData))
        Case "TIF", "TIFF"
            $tParams = _GDIPlus_ParamInit(2)
            $tData = DllStructCreate("int ColorDepth;int Compression")
            DllStructSetData($tData, "ColorDepth", $giTIFColorDepth)
            DllStructSetData($tData, "Compression", $giTIFCompression)
            _GDIPlus_ParamAdd($tParams, $GDIP_EPGCOLORDEPTH, 1, $GDIP_EPTLONG, DllStructGetPtr($tData, "ColorDepth"))
            _GDIPlus_ParamAdd($tParams, $GDIP_EPGCOMPRESSION, 1, $GDIP_EPTLONG, DllStructGetPtr($tData, "Compression"))
    EndSwitch
    If IsDllStruct($tParams) Then $pParams = DllStructGetPtr($tParams)

    $iResult = _GDIPlus_ImageSaveToFileEx($hImage, $sFileName, $sCLSID, $pParams)
    _GDIPlus_ImageDispose($hImage)
    If $fFreeBmp Then _WinAPI_DeleteObject($hBitmap)

    Return SetError($iResult = False, 0, $iResult = True)
EndFunc   ;==>_ScreenCapture_SaveImage

[Authenticity]

If you don't need the $hBitmap returned by the _ScreenCapture_Capture() function then release it or specify true in the third parameter of the __ScreenCapture_SaveImage() function. Not sure if this is the cause of the buffer overflow error.

[malu05]

If you don't need the $hBitmap returned by the _ScreenCapture_Capture() function then release it or specify true in the third parameter of the __ScreenCapture_SaveImage() function. Not sure if this is the cause of the buffer overflow error.

Ahh yea, that did it.

There error was caused by _WinAPI_CreateCompatibleBitmap, apparently because _WinAPI_ReleaseDC was not used.