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楼主 |
发表于 2021-12-8 12:36:27
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感谢,成功了。本来是准备利用prt sc来实现截屏,最后保存成一张图片。发现没那么简单。抄了一段别人的代码,成了。附上代码。- #include <windows.h>
- BOOL SaveBmp(HBITMAP hBitmap, LPSTR FileName);
- int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
- {
- EmptyClipboard();
- keybd_event(VK_SNAPSHOT,0,0,0);
- OpenClipboard(NULL);
- //OpenClipboard(NULL);
- HBITMAP handle = (HBITMAP)GetClipboardData(CF_BITMAP);
- SaveBmp(handle,"d:\\aaa.bmp");
- CloseClipboard();
- return 0;
- }
- BOOL SaveBmp(HBITMAP hBitmap, LPSTR FileName)
- {
- HDC hDC;
- int iBits;
- WORD wBitCount;
- DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;
- BITMAP Bitmap;
- BITMAPFILEHEADER bmfHdr;
- BITMAPINFOHEADER bi;
- LPBITMAPINFOHEADER lpbi;
- HANDLE fh, hDib, hPal,hOldPal=NULL;
- int aa = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + 288 * 352 * 24 / 8;
- hDC = CreateDC("DISPLAY", NULL, NULL, NULL);
- iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);
- DeleteDC(hDC);
- if(iBits <= 1)
- wBitCount = 1;
- else if(iBits <= 4)
- wBitCount = 4;
- else if(iBits <= 8)
- wBitCount = 8;
- else
- wBitCount = 24;
-
- GetObject(hBitmap, sizeof(Bitmap), (LPSTR)&Bitmap);
- bi.biSize= sizeof(BITMAPINFOHEADER);
- bi.biWidth = Bitmap.bmWidth;
- bi.biHeight = Bitmap.bmHeight;
- bi.biPlanes = 1;
- bi.biBitCount = wBitCount;
- bi.biCompression= BI_RGB;
- bi.biSizeImage = Bitmap.bmWidth * Bitmap.bmHeight * 3;
- bi.biXPelsPerMeter = 0;
- bi.biYPelsPerMeter = 0;
- bi.biClrImportant = 0;
- bi.biClrUsed = 0;
-
- dwBmBitsSize = ((Bitmap.bmWidth *wBitCount+31) / 32)*4* Bitmap.bmHeight;
-
- //为位图内容分配内存
- hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
- lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
- *lpbi = bi;
-
- // 处理调色板
- hPal = GetStockObject(DEFAULT_PALETTE);
- if (hPal)
- {
- hDC = ::GetDC(NULL);
- hOldPal = ::SelectPalette(hDC,(HPALETTE)hPal, FALSE);
- RealizePalette(hDC);
- }
-
- // 获取该调色板下新的像素值
- GetDIBits(hDC,hBitmap, 0,(UINT)Bitmap.bmHeight,
- (LPSTR)lpbi+ sizeof(BITMAPINFOHEADER)+dwPaletteSize,
- (BITMAPINFO *)lpbi, DIB_RGB_COLORS);
-
- //恢复调色板
- if (hOldPal)
- {
- ::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
- RealizePalette(hDC);
- ::ReleaseDC(NULL, hDC);
- }
-
- //创建位图文件
- fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,
- FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
-
- if (fh == INVALID_HANDLE_VALUE) return FALSE;
-
- // 设置位图文件头
- bmfHdr.bfType = 0x4D42; // "BM"
- dwDIBSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;
- bmfHdr.bfSize = dwDIBSize;
- bmfHdr.bfReserved1 = 0;
- bmfHdr.bfReserved2 = 0;
- bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;
- // 写入位图文件头
- WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
- // 写入位图文件其余内容
- WriteFile(fh, (LPSTR)lpbi, dwDIBSize - 14, &dwWritten, NULL);
- //清除
- GlobalUnlock(hDib);
- GlobalFree(hDib);
- CloseHandle(fh);
-
- return TRUE;
- }
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