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void Cvc2005Dlg::OnBnClickedButton1()
{
// 目标窗体不能最小化
HWND src_hWnd = ::FindWindowW(NULL, L"计算器");
RECT rc;
::GetWindowRect(src_hWnd, &rc);
// 24位图的BITMAPINFO
BITMAPINFO *pBITMAPINFO = (BITMAPINFO*)malloc(sizeof(BITMAPINFOHEADER));
memset(pBITMAPINFO, 0, sizeof(BITMAPINFOHEADER));
BITMAPINFOHEADER *pInfo_Header = (BITMAPINFOHEADER *)pBITMAPINFO;
pInfo_Header->biSize = sizeof(BITMAPINFOHEADER);
pInfo_Header->biWidth = rc.right - rc.left;
pInfo_Header->biHeight = rc.bottom - rc.top;
pInfo_Header->biPlanes = 1;
pInfo_Header->biBitCount = 24;
pInfo_Header->biCompression = BI_RGB;
// 创建兼容DC 打印目标窗体
HDC src_hdc = ::GetWindowDC(src_hWnd);
HBITMAP hBitmap = ::CreateCompatibleBitmap(src_hdc,
pInfo_Header->biWidth, pInfo_Header->biHeight);
HDC hdcCompatible = CreateCompatibleDC(src_hdc);
::SelectObject(hdcCompatible, hBitmap);
::PrintWindow(src_hWnd, hdcCompatible, 0);
CDC *pdcCompatible = CDC::FromHandle(hdcCompatible);
::ReleaseDC(src_hWnd, src_hdc);
// 把兼容DC贴到DC上
CDC *pCurDC = this->GetDC();
pCurDC->BitBlt(0,0,pInfo_Header->biWidth, pInfo_Header->biHeight,pdcCompatible,0,0,SRCCOPY);
// 获得数据buf
DWORD bufSize = (pInfo_Header->biWidth * 3 + 3) / 4 * 4 * pInfo_Header->biHeight;
BYTE * pBuffer = new BYTE[bufSize];
if(GetDIBits(hdcCompatible, hBitmap, 0, pInfo_Header->biHeight, pBuffer,
pBITMAPINFO, DIB_RGB_COLORS) == 0)
{
AfxMessageBox(L"GetDIBits");
}
// 建立文件
CFile file;
file.Open(L"D:\\新图.bmp", CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
// 写文件头
BITMAPFILEHEADER File_Header;
File_Header.bfType = 0x4d42;
File_Header.bfOffBits = sizeof(BITMAPFILEHEADER) + pInfo_Header->biSize;
File_Header.bfSize = File_Header.bfOffBits + bufSize;
File_Header.bfReserved1 = 0;
File_Header.bfReserved2 = 0;
file.Write(&File_Header, sizeof(BITMAPFILEHEADER));
// 写数据头
file.Write(pInfo_Header, sizeof(BITMAPINFOHEADER));
// 写数据
file.Write(pBuffer, bufSize);
// 关闭文件 释放内存
file.Close();
delete []pBuffer;
free(pBITMAPINFO);
::DeleteObject(hdcCompatible);
::DeleteObject(hBitmap);
this->ReleaseDC(pCurDC);
}