Проблема в функции CreateCompatibleBitmap: на 29 кадре возвращает нуль и код ошибки 8 (ERROR_NOT_ENOUGH_MEMORY). Причина: неправильно освобождается этот ресурс.
| Код | #include <windows.h>
#include <gdiplus.h>
#include <tchar.h>
#pragma comment (lib, "gdiplus.lib")
using namespace Gdiplus;
int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
UINT num = 0; // number of image encoders
UINT size = 0; // size of the image encoder array in bytes
ImageCodecInfo* pImageCodecInfo = NULL;
GetImageEncodersSize(&num, &size);
if(size == 0)
return -1; // Failure
pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
if(pImageCodecInfo == NULL)
return -1; // Failure
GetImageEncoders(num, size, pImageCodecInfo);
for(UINT j = 0; j < num; ++j)
{
if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
{
*pClsid = pImageCodecInfo[j].Clsid;
free(pImageCodecInfo);
return j; // Success
}
}
free(pImageCodecInfo);
return -1; // Failure
}
void GetScreen(LPWSTR filename)
{
int Width, Height;
HDC scrdc, memdc;
HBITMAP membit;
scrdc = GetDC(0);
Height = GetSystemMetrics(SM_CYSCREEN);
Width = GetSystemMetrics(SM_CXSCREEN);
memdc = CreateCompatibleDC(scrdc);
membit = CreateCompatibleBitmap(scrdc, Width, Height);
HGDIOBJ oldbit = SelectObject(memdc, membit);
BitBlt(memdc, 0, 0, Width, Height, scrdc, 0, 0, SRCCOPY);
Bitmap * bmp = new Bitmap(membit, NULL);
Image * img = bmp->GetThumbnailImage(720, 540);
CLSID imgClsid;
EncoderParameters encoderParams;
int quality = 65;
encoderParams.Count = 1;
encoderParams.Parameter[0].Guid = EncoderQuality;
encoderParams.Parameter[0].Type = 4;
encoderParams.Parameter[0].NumberOfValues = 1;
encoderParams.Parameter[0].Value = &quality;
GetEncoderClsid(L"image/jpeg", &imgClsid);
int status;
status = img->Save(filename, &imgClsid, &encoderParams);
delete bmp;
delete img;
SelectObject(memdc, oldbit); // отсоединяет совм. битмап от совм. контекста.
DeleteObject(membit);
//ReleaseDC(0, memdc); // gdi resource leak (исправил: 26.01.2009)
DelectObject(memdc);
ReleaseDC(0, scrdc);
}
int APIENTRY _tWinMain(HINSTANCE, HINSTANCE, LPCTSTR, INT)
{
ULONG_PTR gdiplusToken;
GdiplusStartupInput gdiplusStartupInput;
wchar_t buff[260];
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
for(int i = 0; i<100; ++i)
{
//if(i >= 28) __asm int 3;
swprintf(buff, L"C:\\output\\%d.jpg", i);
GetScreen(buff);
}
GdiplusShutdown(gdiplusToken);
return 0;
} |
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