C++捕获全屏(截全屏)

函数：捕获全屏图片
参数：LPRECT lpRect 图片大小

返回：HBITMAP hBitmap

HBITMAP CopyScreenToBitmap(LPRECT lpRect)
{HDC hScrDC, hMemDC;HBITMAP hBitmap, hOldBitmap;int       nX, nY, nX2, nY2;int       nWidth, nHeight;int       xScrn, yScrn;if (IsRectEmpty(lpRect))return NULL;hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);hMemDC = CreateCompatibleDC(hScrDC);nX = lpRect->left;nY = lpRect->top;nX2 = lpRect->right;nY2 = lpRect->bottom;xScrn = GetDeviceCaps(hScrDC, HORZRES);yScrn = GetDeviceCaps(hScrDC, VERTRES);if (nX < 0)nX = 0;if (nY < 0)nY = 0;if (nX2 > xScrn)nX2 = xScrn;if (nY2 > yScrn)nY2 = yScrn;nWidth = nX2 - nX;nHeight = nY2 - nY;hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);DeleteDC(hScrDC);DeleteDC(hMemDC);return hBitmap;
}

函数：将Bitmap另存为文件
参数：HBITMAP hBitmap 图片数据

LPSTR lpFileName 文件路径名称

返回：成功/失败

bool SaveBitmapToFile(HBITMAP hBitmap, LPSTR lpFileName)
{                                                        HDC    hDC;int     iBits;WORD    wBitCount;DWORD          dwPaletteSize = 0, dwBmBitsSize, dwDIBSize, dwWritten;BITMAP         Bitmap;BITMAPFILEHEADER  bmfHdr;BITMAPINFOHEADER  bi;LPBITMAPINFOHEADER lpbi;HANDLE         fh, hDib, hPal;HPALETTE     hOldPal = NULL;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 if (iBits <= 24)wBitCount = 24;elsewBitCount = 32;if (wBitCount <= 8)dwPaletteSize = (1 << wBitCount) * sizeof(RGBQUAD);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 = 0;bi.biXPelsPerMeter = 0;bi.biYPelsPerMeter = 0;bi.biClrUsed = 0;bi.biClrImportant = 0;dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;hDib = GlobalAlloc(GHND, dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);*lpbi = bi;hPal = GetStockObject(DEFAULT_PALETTE);if (hPal){hDC = ::GetDC(NULL);hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);RealizePalette(hDC);}GetDIBits(hDC, hBitmap, 0, (UINT)Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER) + dwPaletteSize, (BITMAPINFO*)lpbi, DIB_RGB_COLORS);if (hOldPal){SelectPalette(hDC, hOldPal, TRUE);RealizePalette(hDC);::ReleaseDC(NULL, hDC);}fh = CreateFile(lpFileName, 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;WriteFile(fh, (LPSTR)& bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);WriteFile(fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize, &dwWritten, NULL);GlobalUnlock(hDib);GlobalFree(hDib);CloseHandle(fh);return TRUE;
}

调用方法：

bool ScreenshotRect(LPRECT rect, LPSTR lpFileName, CString& strErrmsg)
{HBITMAP hMap = CopyScreenToBitmap(rect);  //捕获图片if (hMap != nullptr){bool bSuccessSaveBitmp = SaveBitmapToFile(hMap, lpFileName);  //保存图片DeleteObject(hMap);if (!bSuccessSaveBitmp){strErrmsg = "截图存储失败！";}return bSuccessSaveBitmp;}else{strErrmsg = "截图失败";return false;}
}

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