保存画面为图片 当前MFC保存该程序为图片 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的图象拷贝到内存DC中

    CImage image;
    image.Attach(hBitMap);
    image.Save(_T("c://B.jpg"));//假设文件后缀为.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的图象拷贝到内存DC中

    CImage image;//须要#include <atlimage.h>
    image.Attach(hBitMap);
    image.Save(_T("c://B.jpg"));//假设文件后缀为.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;

        //向文件里写入位图数据
        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();

}

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