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。

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#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：

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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：

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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();

}
http://blog.csdn.net/hityct1/article/details/3918305