将屏幕保存为图片 将当前MFC程序保存为图片 c++ vc

将屏幕保存为图片，使用vs2008编译通过。

 #include "stdafx.h"
 #include <windows.h>
 #include <atlimage.h>

 int __stdcall WinMain(
             HINSTANCE hInstance,
             HINSTANCE hPrevInstance,
             LPSTR lpCmdLine,
             int nShowCmd)
 {
     HWND hwnd = ::GetDesktopWindow();
     HDC hDC = ::GetDC(hwnd);//获取屏幕DC

     RECT rect;
     ::GetClientRect(hwnd, &rect);//获取屏幕大小
     HDC hDCMem = ::CreateCompatibleDC(hDC);//创建兼容DC

     HBITMAP hBitMap = ::CreateCompatibleBitmap(hDC, rect.right, rect.bottom);//创建兼容位图
     HBITMAP hOldMap = (HBITMAP)::SelectObject(hDCMem, hBitMap);//将位图选入DC，并保存返回值

     ::BitBlt(hDCMem, 0, 0, rect.right, rect.bottom, hDC, 0, 0, SRCCOPY);//将屏幕DC的图象复制到内存DC中

     CImage image;
     image.Attach(hBitMap);
     image.Save(_T("c://B.jpg"));//如果文件后缀为.bmp，则保存为为bmp格式
     image.Detach();

     ::SelectObject(hDCMem, hOldMap);//选入上次的返回值

     //释放
     ::DeleteObject(hBitMap);
     ::DeleteDC(hDCMem);
     ::DeleteDC(hDC);

     return 0;
 }

 

 

 

 

将当前MFC程序（这里是单文档程序）保存为图片，使用vs2005。第一个使用CImage类保存图片，第二个使用BITMAPINFO。

第一个：

 void CMainFrame::OnGetMap()
 {

     HWND hwnd = this->GetSafeHwnd();
     HDC hDC = ::GetWindowDC(hwnd);//获取DC


     RECT rect;
     ::GetWindowRect(hwnd, &rect);//获取屏幕大小
     HDC hDCMem = ::CreateCompatibleDC(hDC);//创建兼容DC

     HBITMAP hBitMap = ::CreateCompatibleBitmap(hDC, rect.right-rect.left, rect.bottom-rect.top);//创建兼容位图
     HBITMAP hOldMap = (HBITMAP)::SelectObject(hDCMem, hBitMap);//将位图选入DC，并保存返回值

     ::BitBlt(hDCMem, 0, 0, rect.right-rect.left, rect.bottom-rect.top, hDC, 0, 0, SRCCOPY);//将屏幕DC的图象复制到内存DC中

     CImage image;//需要#include <atlimage.h>
     image.Attach(hBitMap);
     image.Save(_T("c://B.jpg"));//如果文件后缀为.bmp，则保存为为bmp格式
     image.Detach();

     ::SelectObject(hDCMem, hOldMap);//选入上次的返回值

     //释放
     ::DeleteObject(hBitMap);
     ::DeleteDC(hDCMem);
     ::DeleteDC(hDC);
 }

 

第二个：

 void CMainFrame::OnGetMap()
 {

     CDC* pDC = GetWindowDC();
     CBitmap bitmap;
     CDC memDC ;
     CRect rect;
     GetWindowRect(rect);
     memDC.CreateCompatibleDC(pDC);

     bitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());
     memDC.SelectObject(&bitmap);
     memDC.BitBlt(0,0,rect.Width(),rect.Height(),pDC,0,0,SRCCOPY);

     CFileDialog fDlg(FALSE,_T("bmp"),NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("位图文件|*.bmp"),this);
     if (fDlg.DoModal()==IDOK)
     {

         CString bmpfile = fDlg.GetPathName();

         CFile file(bmpfile,CFile::modeCreate|CFile::modeWrite);

         BITMAP bInfo;
         bitmap.GetBitmap(&bInfo);

         //计算调色板大小
         int panelsize = 0;
         if (bInfo.bmBitsPixel<24) //非真彩色
         {
             panelsize = pow((double)2,bInfo.bmBitsPixel)*sizeof(RGBQUAD);
         }

         //定义位图信息
         BITMAPINFO*  bMapInfo = (BITMAPINFO*)LocalAlloc(LPTR,sizeof(BITMAPINFO)+panelsize);
         bMapInfo->bmiHeader.biBitCount = bInfo.bmBitsPixel;
         bMapInfo->bmiHeader.biClrImportant = 0;
         bMapInfo->bmiHeader.biCompression = 0;
         bMapInfo->bmiHeader.biHeight = bInfo.bmHeight;
         bMapInfo->bmiHeader.biPlanes = bInfo.bmPlanes;
         bMapInfo->bmiHeader.biSize = sizeof(BITMAPINFO);
         bMapInfo->bmiHeader.biSizeImage = bInfo.bmHeight*bInfo.bmWidthBytes;
         bMapInfo->bmiHeader.biWidth = bInfo.bmWidth;
         bMapInfo->bmiHeader.biXPelsPerMeter = 0;
         bMapInfo->bmiHeader.biYPelsPerMeter = 0;

         //获取位图的实际数据
         char* pData = new char[bMapInfo->bmiHeader.biSizeImage];
         int len = GetDIBits(pDC->m_hDC,bitmap,0,bInfo.bmHeight,pData,bMapInfo,DIB_RGB_COLORS);

         BITMAPFILEHEADER bFileHeader;
         bFileHeader.bfType = 0x4D42;
         bFileHeader.bfReserved1 = 0;
         bFileHeader.bfReserved2 = 0;
         bFileHeader.bfSize = sizeof(BITMAPFILEHEADER);
         bFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+panelsize;

         //向文件中写入位图数据
         file.Write(&bFileHeader,sizeof(BITMAPFILEHEADER));
         file.Write(&bMapInfo->bmiHeader,sizeof(BITMAPINFOHEADER));
         file.Write(pData,bMapInfo->bmiHeader.biSizeImage+panelsize);
         file.Close();
         delete pData;
         LocalFree(bMapInfo);
     }
     bitmap.DeleteObject();
     memDC.DeleteDC();

 }