捕捉屏幕类【收藏】【原作者：freefalcon(心宇—小小菜鸟想高飞) 】

///////////////////////////////////////////////////////
// CaptureControl.h
// freefalcon 2004.12.10
#include <afxwin.h>
#ifndef __CAPTURE_CONTROL_H__
#define __CAPTURE_CONTROL_H__

#define CAPTURE_DEST_CLIPBOARD 0
#define CAPTURE_DEST_FILE  1

class CCaptureControl
{
public:
 CCaptureControl()
 {
  m_hWnd = NULL;
  m_nDest = CAPTURE_DEST_CLIPBOARD;
  m_strFilePath = ".";
  m_strFileName = "NoName";
  m_nWidth = 0;
  m_nHeight = 0;
 }

 virtual ~CCaptureControl()
 {
 }
 
 HWND SetWindow(HWND hWnd = NULL)
 {
  HWND oldhWnd = m_hWnd;
  m_hWnd = hWnd;
  return oldhWnd;
 }
 
 void SetDestination(UINT nDest)
 {
  m_nDest = nDest;
 }

 void SetFilePath(const CString& strFilePath)
 {
  m_strFilePath = strFilePath;
 }

 void SetFileName(const CString& strFileName)
 {
  m_strFileName = strFileName;
 }
 
 int GetWidth() const
 {
  return m_nWidth;
 }
 
 int GetHeight() const
 {
  return m_nHeight;
 }
 
 BOOL Capture()
 {
  BOOL ret = TRUE;
  CDC dc;
  int nWidth;
  int nHeight;  
  
  if(m_hWnd == NULL)
  {
   dc.CreateDC("DISPLAY",NULL,NULL,NULL);
   nWidth = GetSystemMetrics(SM_CXSCREEN);
   nHeight = GetSystemMetrics(SM_CYSCREEN);
  }
  else
  {
   CWnd* pWnd = CWnd::FromHandle(m_hWnd);
   CDC* pDC = pWnd->GetDC();
   dc.Attach(pDC->GetSafeHdc());
   CRect rect;
   pWnd->GetClientRect(&rect);
   nWidth = rect.Width();
   nHeight = rect.Height();
  }
  
  m_nWidth = nWidth;
  m_nHeight = nHeight;
  
  CDC dcMem;
  dcMem.CreateCompatibleDC(&dc);
  CBitmap bitmap;
  bitmap.CreateCompatibleBitmap(&dc, nWidth, nHeight);
  CBitmap *pOldBitmap = dcMem.SelectObject(&bitmap);
  dcMem.BitBlt(0,0,nWidth,nHeight,&dc,0,0,SRCCOPY);
  dcMem.SelectObject(pOldBitmap);
  
  if(m_nDest == CAPTURE_DEST_CLIPBOARD)
  {
   ret = CopyBitmapToClipboard(bitmap);
  }
  else if(m_nDest == CAPTURE_DEST_FILE)
  {
   CString strFileFullPath = m_strFilePath+"\\"+m_strFileName + ".bmp";
   ret = SaveBitmapToFile(dc.GetSafeHdc(), bitmap, strFileFullPath);
  }  
  
  if(m_hWnd == NULL)
  {
   dc.DeleteDC();
  }
  else
  {
   dc.Detach();
  }

  return ret;
 }

protected:
 BOOL CopyBitmapToClipboard(const CBitmap& bitmap)
 {
  BOOL ret = FALSE;
  if((::OpenClipboard(NULL) != 0) && (::EmptyClipboard() != 0))
  {   
   if(::SetClipboardData(CF_BITMAP,bitmap.GetSafeHandle()) != NULL)
   {
    ret = TRUE;
   }
   ::CloseClipboard(); 
  }

  return ret;
 }

 BOOL SaveBitmapToFile(HDC hDC, CBitmap& bitmap, LPCTSTR lpszFileName)
 {
  BOOL ret = TRUE;
  BITMAP btm;
  bitmap.GetBitmap(&btm);
  DWORD size = btm.bmWidthBytes * btm.bmHeight;

  HGLOBAL hMem = GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT,size);
  if(hMem == NULL)
  {
   return FALSE;
  }
  LPSTR lpData = (LPSTR)GlobalLock(hMem);

  /////////////////////////////////////////////
  BITMAPINFOHEADER bih;
  bih.biSize = sizeof(BITMAPINFOHEADER);
  bih.biWidth = btm.bmWidth;
  bih.biHeight = btm.bmHeight;
  bih.biPlanes = 1;
  bih.biBitCount = btm.bmBitsPixel;
  bih.biCompression = 0;
  bih.biSizeImage = size;
  bih.biXPelsPerMeter = 0;
  bih.biYPelsPerMeter = 0;
  bih.biClrUsed = 0;
  bih.biClrImportant = 0;
  if(GetDIBits(hDC,bitmap,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS) == 0)
  {
   GlobalFree(hMem);
   return FALSE;
  }
  //bitmap.GetBitmapBits(size,lpData);//此函数在处理5-5-5模式的16位色下会出现颜色混乱
  
  BITMAPFILEHEADER bfh;
  bfh.bfType = ((WORD)('M'<< 8)|'B');
  bfh.bfReserved1 = 0;
  bfh.bfReserved2 = 0;
  bfh.bfSize = 54+size;
  bfh.bfOffBits = 54;
  
  CFile bf;
  if(bf.Open(lpszFileName, CFile::modeCreate|CFile::modeWrite))
  {
   bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));
   bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
   bf.WriteHuge(lpData,size);
   bf.Close();
  }
  else
  {
   ret = FALSE;
  }
  
  GlobalFree(hMem);

  return ret;
 }

protected:
 UINT  m_nDest;
 HWND  m_hWnd;
 CString  m_strFilePath;
 CString  m_strFileName;
 int   m_nWidth;
 int   m_nHeight;
};

#endif//__CAPTURE_CONTROL_H__
int main()
{
  CBitmap const bitmap;
  CString const path="C:\\";
  CString const fileName="ok.bmp";
  CCaptureControl c;
 
  c.SetFilePath(path);
  c.SetFileName(fileName);
  c.SetDestination(1);
  c.Capture();
  c.~CCaptureControl();
  return 0;
}

说明：该类由csdn朋友freefalcon(心宇—小小菜鸟想高飞) 设计，我只是收藏

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