VC获取窗口图片（截图）

//借鉴网上的文章：

HBITMAP CopyDCToBitmap(HDC hDC, LPRECT lpRect)

{

if(!hDC || !lpRect || IsRectEmpty(lpRect))

return NULL;

HDC hMemDC;

HBITMAP hBitmap, hOldBitmap;

int nX, nY, nX2, nY2;

int nWidth, nHeight;

nX = lpRect->left;

nY = lpRect->top;

nX2 = lpRect->right;

nY2 = lpRect->bottom;

nWidth = nX2 - nX;

nHeight = nY2 - nY;

hMemDC = CreateCompatibleDC(hDC);

hBitmap = CreateCompatibleBitmap(hDC, nWidth, nHeight);

hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

StretchBlt(hMemDC, 0, 0, nWidth, nHeight, hDC, nX, nY, nWidth, nHeight, SRCCOPY);

hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);

DeleteDC(hMemDC);

DeleteObject(hOldBitmap);

return hBitmap;

}

//抓屏，保存为图片

BOOL SaveBmp(HBITMAP bmp,char* path)

{

//把位图的信息保存到bmpinfo;

BITMAP bmpinfo;

GetObject(bmp,sizeof(BITMAP),&bmpinfo);

DWORD dwBmBitsSize = ((bmpinfo.bmWidth * 32+31)/32) * 4 * bmpinfo.bmHeight;

//位图文件头 14字节

BITMAPFILEHEADER bf;

bf.bfType = 0x4D42;

//BM

bf.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwBmBitsSize;

bf.bfReserved1 = 0;

bf.bfReserved2 = 0;

bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);

//位图信息头

BITMAPINFOHEADER bi;

bi.biSize = sizeof(BITMAPINFOHEADER);

bi.biWidth = bmpinfo.bmWidth;

bi.biHeight = bmpinfo.bmHeight;

bi.biPlanes = 1;

bi.biBitCount = 32;

bi.biCompression = BI_RGB;

bi.biSizeImage = 0;

bi.biXPelsPerMeter = 0;

bi.biYPelsPerMeter = 0;

bi.biClrUsed = 8;

bi.biClrImportant = 0;

//位图数据;

char* context = new char[dwBmBitsSize];

HDC dc = ::GetDC(NULL);

GetDIBits(dc, bmp, 0, bi.biHeight, context, (BITMAPINFO*)&bi, DIB_RGB_COLORS);

FILE* f = fopen(path,"wb");

fwrite((char*)&bf,sizeof(BITMAPFILEHEADER),1,f);

fwrite((char*)&bi,sizeof(BITMAPINFOHEADER),1,f);

fwrite(context,dwBmBitsSize,1,f);

fclose(f);

delete context;

::ReleaseDC(NULL,dc);

return 0;

}

void CaptureScreen()

{

int nScreenWidth = GetSystemMetrics(SM_CXSCREEN);

int nScreenHeight = GetSystemMetrics(SM_CYSCREEN);

HWND hDesktopWnd = GetDesktopWindow();

HDC hDesktopDC = GetDC(hDesktopWnd);

HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);

HBITMAP hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC,

nScreenWidth, nScreenHeight);

SelectObject(hCaptureDC,hCaptureBitmap);

BitBlt(hCaptureDC,0,0,nScreenWidth,nScreenHeight,hDesktopDC,0,0,SRCCOPY);

SaveBmp(hCaptureBitmap, "F:\\capture.bmp"); //Place holder - Put your code

//here to save the captured image to disk

ReleaseDC(hDesktopWnd,hDesktopDC);

DeleteDC(hCaptureDC);

DeleteObject(hCaptureBitmap);

}

void CCaptureScreenDlg::OnBnClickedButton1()

{

// TODO: 在此添加控件通知处理程序代码

CaptureScreen();

}