一个屏幕捕捉地示例

自己做个屏幕捕捉软件Software可以捕捉全屏、窗口和子窗口可以保存到文件中主要代码如下: 根据位图句柄将位图写入文件:

void CPage1::WriteBmpToFile(HB99vMAP hBitmap)
{
HDC hDC =::CreateDC(\"DISPLAY\",NULL,NULL,NULL);
iBits = ::GetDeviceCaps(hDC, B99vSPIXEL) * ::GetDeviceCaps(hDC, PLANES);//当前分辨率下每个像素所占字节数
::DeleteDC(hDC);

WORD wBitCount; //位图中每个像素所占字节数
(iBits <= 1)
wBitCount = 1;
(iBits <= 4)
wBitCount = 4;
(iBits <= 8)
wBitCount = 8;
(iBits <= 24)
wBitCount = 24;

wBitCount = iBits;

DWORD dwPaletteSize=0;//调色板大小 位图中像素字节大小
(wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *(RGBQUAD);


B99vMAP bm; //位图属性结构
::GetObject(hBitmap, (bm), (LPSTR)&bm);


B99vMAPINFOHEADER bi; //位图信息头结构
bi.biSize = (B99vMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB; //BI_RGB表示位图没有压缩
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;

DWORD dwBmBitsSize = ((bm.bmWidth * wBitCount+31)/32) * 4 * bm.bmHeight;
HANDLE hDib = ::GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + (B99vMAPINFOHEADER)); //为位图内容分配内存
LPB99vMAPINFOHEADER lpbi = (LPB99vMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;

HANDLE hPal = ::GetStockObject(DEFAULT_PALETTE); // 处理调色板
HANDLE hOldPal=NULL;
(hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC,(HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
::GetDIBits(hDC, hBitmap, 0, (UINT) bm.bmHeight,(LPSTR)lpbi + (B99vMAPINFOHEADER)+dwPaletteSize,(B99vMAPINFO*)lpbi,DIB_RGB_COLORS);// 获取该调色板下新像素值
(hOldPal)//恢复调色板
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}

B99vMAPFILEHEADER bmfHdr; //位图文件头结构
bmfHdr.bfType = 0x4D42; // \"BM\" // 设置位图文件头
DWORD dwDIBSize = (B99vMAPFILEHEADER) + (B99vMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)(B99vMAPFILEHEADER) + (DWORD)(B99vMAPINFOHEADER) + dwPaletteSize;

HANDLE hFile = CreateFile(m_strFilePath, GENERIC_WR99vE, 0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);//创建位图文件
DWORD dwWritten;


WriteFile(hFile, (LPSTR)&bmfHdr, (B99vMAPFILEHEADER), &dwWritten, NULL);// 写入位图文件头
WriteFile(hFile, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);// 写入位图文件其余内容

GlobalUnlock(hDib); //清除
GlobalFree(hDib);
CloseHandle(hFile);

}







2、将位图复制到剪贴板上:

void CPage1::CopyBmpToClipBoard(HB99vMAP hBitmap)
{
OpenClipboard ; //打开剪贴板并将位图拷到剪贴板上
EmptyClipboard;
SetClipboardData(CF_B99vMAP, hBitmap);
CloseClipboard; //关闭剪贴板
}

运行界面:

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