VC++ 屏幕截图并保存为png格式

谁践踏了优雅 2023-10-04 19:31 133阅读 0赞 
  1. #include <windows.h>
  2. #include <gdiplus.h>
  3. //use  cstring
  4. #include <atlstr.h>
  6. #pragma comment(lib, "gdiplus.lib")
  9. using namespace Gdiplus;
  11. int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
  12. {
  13.     UINT  num = 0;          // number of image encoders  
  14.     UINT  size = 0;         // size of the image encoder array in bytes  
  16.     ImageCodecInfo* pImageCodecInfo = NULL;
  18.     Gdiplus::GetImageEncodersSize(&num, &size);
  19.     if (size == 0)
  20.         return -1;  // Failure  
  22.     pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
  23.     if (pImageCodecInfo == NULL)
  24.         return -1;  // Failure  
  26.     Gdiplus::GetImageEncoders(num, size, pImageCodecInfo);
  28.     for (UINT j = 0; j < num; ++j)
  29.     {
  30.         if (wcscmp(pImageCodecInfo[j].MimeType, format) == 0)
  31.         {
  32.             *pClsid = pImageCodecInfo[j].Clsid;
  33.             free(pImageCodecInfo);
  34.             return j;  // Success  
  35.         }
  36.     }
  38.     free(pImageCodecInfo);
  39.     return -1;  // Failure  
  40. }
  42. void CaptureScreen()
  43. {
  44.     int nScreenWidth = GetSystemMetrics(SM_CXSCREEN);
  45.     int nScreenHeight = GetSystemMetrics(SM_CYSCREEN);
  46.     HWND hDesktopWnd = GetDesktopWindow();
  47.     HDC hDesktopDC = GetDC(hDesktopWnd);
  48.     HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);
  49.     HBITMAP hCaptureBitmap = CreateCompatibleBitmap(hDesktopDC, nScreenWidth, nScreenHeight);
  50.     SelectObject(hCaptureDC, hCaptureBitmap);
  51.     BitBlt(hCaptureDC, 0, 0, nScreenWidth, nScreenHeight, hDesktopDC, 0, 0, SRCCOPY);
  52.     //保存
  54.     //初始化GDI
  55.     Gdiplus::GdiplusStartupInput gdiplusStartupInput;
  56.     ULONG_PTR gdiplusToken;
  57.     if (Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL) != Ok)
  58.     {
  59.         ;
  60.     }
  62.     SYSTEMTIME Systime;
  63.     GetLocalTime(&Systime);
  64.     CString szFileName;
  65.     szFileName.Format(L"%u-%u-%u-%02u%02u.png",
  66.         Systime.wYear, Systime.wMonth, Systime.wDay, Systime.wHour, Systime.wMinute);
  68.     CLSID pngClsid;
  69.     GetEncoderClsid(L"image/png", &pngClsid);
  70.     Gdiplus::Bitmap *pbmSrc = Gdiplus::Bitmap::FromHBITMAP(hCaptureBitmap, NULL);
  71.     if (pbmSrc->Save(szFileName, &pngClsid) == Ok) {
  72.         ;
  73.     }
  74.     //卸载GDI
  75.     Gdiplus::GdiplusShutdown(gdiplusToken);
  77.     DeleteObject(hCaptureBitmap);
  78.     ReleaseDC(hDesktopWnd, hDesktopDC);
  79.     DeleteDC(hCaptureDC);
  81. }
  84. int main()
  85. {
  86.     CaptureScreen();
  87.     return 0;
  88. }

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