在vc中怎么把自己在界面上画的保存为图片？

char path[_MAX_PATH+1];
GetCurrentDirectory(_MAX_PATH+1, path);
CFileDialog dlg(FALSE, _T("*.bmp"), _T("MyBmp"), OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT|OFN_NOCHANGEDIR, _T("Bmp Files (*.bmp)|*.bmp||"));
dlg.DoModal();
CString szFile = dlg.GetPathName()；
CDC* pdc = GetDC();
CDC dcImage;
if (!dcImage.CreateCompatibleDC(pdc))
{
ReleaseDC(pdc);
return;
}
CRect rectcc;
GetClientRect(&rectcc);
CBitmap bitmap;
bitmap.CreateCompatibleBitmap(pdc,rectcc.Width(), rectcc.Height());
CBitmap* oldbmp1 = dcImage.SelectObject(&bitmap);
//OnDraw(&dcImage);
//CBitmap* oldbmp = m_pMemDC->SelectObject(m_pBitmap);
dcImage.BitBlt(0,0,rectcc.Width(),rectcc.Height(), pdc,0,0,SRCCOPY);
//m_pMemDC->SelectObject(oldbmp);
dcImage.SelectObject(oldbmp1);

WriteDIB((LPSTR)(LPCTSTR)szFile, DDBToDIB(bitmap, BI_RGB, NULL));
ReleaseDC(pdc);
SetCurrentDirectory(path);

// DDBToDIB - Creates a DIB from a DDB
// bitmap - Device dependent bitmap
// dwCompression - Type of compression - see BITMAPINFOHEADER
// pPal - Logical palette
HANDLE DDBToDIB( CBitmap& bitmap, DWORD dwCompression, CPalette* pPal )
{
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hDIB;
HANDLE handle;
HDC hDC;
HPALETTE hPal;
ASSERT( bitmap.GetSafeHandle() ); // The function has no arg for bitfields
if( dwCompression == BI_BITFIELDS )
return NULL; // If a palette has not been supplied use defaul palette
hPal = (HPALETTE) pPal->GetSafeHandle();
if (hPal==NULL)
hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE); // Get bitmap information
bitmap.GetObject(sizeof(bm),(LPSTR)&bm); // Initialize the bitmapinfoheader
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = bm.bmPlanes * bm.bmBitsPixel;
bi.biCompression = dwCompression;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0; // Compute the size of the infoheader and the color table
int nColors = (1 << bi.biBitCount);
if( nColors > 256 )
nColors = 0;
dwLen = bi.biSize + nColors * sizeof(RGBQUAD); // We need a device context to get the DIB from
hDC = GetDC(NULL);
hPal = SelectPalette(hDC,hPal,FALSE);
RealizePalette(hDC); // Allocate enough memory to hold bitmapinfoheader and color table
hDIB = GlobalAlloc(GMEM_FIXED,dwLen); if (!hDIB){
SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return NULL;
} lpbi = (LPBITMAPINFOHEADER)hDIB; *lpbi = bi; // Call GetDIBits with a NULL lpBits param, so the device driver
// will calculate the biSizeImage field
GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS); bi = *lpbi; // If the driver did not fill in the biSizeImage field, then compute it
// Each scan line of the image is aligned on a DWORD (32bit) boundary
if (bi.biSizeImage == 0){
bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
* bi.biHeight; // If a compression scheme is used the result may infact be larger
// Increase the size to account for this.
if (dwCompression != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
} // Realloc the buffer so that it can hold all the bits
dwLen += bi.biSizeImage;
if (handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE))
hDIB = handle;
else{
GlobalFree(hDIB); // Reselect the original palette
SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return NULL;
} // Get the bitmap bits
lpbi = (LPBITMAPINFOHEADER)hDIB; // FINALLY get the DIB
BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
0L, // Start scan line
(DWORD)bi.biHeight, // # of scan lines
(LPBYTE)lpbi // address for bitmap bits
+ (bi.biSize + nColors * sizeof(RGBQUAD)),
(LPBITMAPINFO)lpbi, // address of bitmapinfo
(DWORD)DIB_RGB_COLORS); // Use RGB for color table if( !bGotBits )
{
GlobalFree(hDIB);

SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return NULL;
} SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return hDIB;
}// WriteDIB - Writes a DIB to file
// Returns - TRUE on success
// szFile - Name of file to write to
// hDIB - Handle of the DIB
BOOL WriteDIB( LPTSTR szFile, HANDLE hDIB)
{
BITMAPFILEHEADER hdr;
LPBITMAPINFOHEADER lpbi; if (!hDIB)
return FALSE; CFile file;
if( !file.Open( szFile, CFile::modeWrite|CFile::modeCreate) )
return FALSE; lpbi = (LPBITMAPINFOHEADER)hDIB; int nColors = 1 << lpbi->biBitCount;
if( nColors > 256 )
nColors = 0; // Fill in the fields of the file header
hdr.bfType = ((WORD) ('M' << 8) | 'B'); // is always "BM"
hdr.bfSize = GlobalSize (hDIB) + sizeof( hdr );
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
hdr.bfOffBits = (DWORD) (sizeof( hdr ) + lpbi->biSize +
nColors * sizeof(RGBQUAD)); // Write the file header
file.Write( &hdr, sizeof(hdr) ); // Write the DIB header and the bits
file.Write( lpbi, GlobalSize(hDIB) ); return TRUE;
}

刚好做过一个相同的东西，发个程序给你吧。
void CUSBSENDDlg::OnSave()
{
// TODO: Add your control notification handler code here
CRect rect;
HBITMAP hBmp; GetDlgItem(IDC_PIC)->GetWindowRect(rect);
ScreenToClient(rect); CString strFilter="Bitmap Files (*.bmp)|*.bmp||";
CFileDialog dlg(FALSE,"bmp", NULL, OFN_HIDEREADONLY|OFN_EXPLORER, strFilter, NULL);
if (dlg.DoModal() == IDOK)
    {
hBmp=GetSrcBit(rect);
SaveBmp(hBmp,dlg.GetPathName());
}
}HBITMAP CUSBSENDDlg::GetSrcBit(CRect rect)
{
HDC  hBufDC,hDC;
HBITMAP  hBitmap,  hBitTemp; CClientDC dc(this);
hDC=dc.GetSafeHdc();
//创建设备上下文(HDC)
hBufDC  =  CreateCompatibleDC(NULL);

//创建HBITMAP
hBitmap  =  CreateCompatibleBitmap(hDC,rect.Width(),rect.Height());
hBitTemp  =  (HBITMAP)  SelectObject(hBufDC,  hBitmap);

//得到位图缓冲区
StretchBlt(hBufDC,0,0,rect.Width(),rect.Height(),
hDC,rect.left,rect.top,rect.Width(),rect.Height(),SRCCOPY);

//得到最终的位图信息
hBitmap  =  (HBITMAP)  SelectObject(hBufDC,  hBitTemp);

//释放内存

DeleteObject(hBitTemp);
::DeleteDC(hBufDC);
ReleaseDC(&dc);
return  hBitmap;
}  BOOL CUSBSENDDlg::SaveBmp(HBITMAP  hBitmap,  CString  FileName)
{
//设备描述表
HDC  hDC;
//当前分辨率下每象素所占字节数
int  iBits;
//位图中每象素所占字节数
WORD  wBitCount;
//定义调色板大小，  位图中像素字节大小  ，位图文件大小  ，  写入文件字节数
DWORD  dwPaletteSize=0,  dwBmBitsSize=0,  dwDIBSize=0,  dwWritten=0;
//位图属性结构
BITMAP  Bitmap;
//位图文件头结构
BITMAPFILEHEADER  bmfHdr;
//位图信息头结构
BITMAPINFOHEADER  bi;
//指向位图信息头结构
LPBITMAPINFOHEADER  lpbi;
//定义文件，分配内存句柄，调色板句柄
HANDLE fh,hDib,hOldPal=NULL;
// HANDLE hPal;
//计算位图文件每个像素所占字节数
hDC  =  CreateDC("DISPLAY",  NULL,  NULL,  NULL); iBits  =  GetDeviceCaps(hDC,  BITSPIXEL)  *  GetDeviceCaps(hDC,  PLANES);
DeleteDC(hDC);
if  (iBits  <=  1) wBitCount  =  1;
else  if  (iBits  <=  4)   wBitCount  =  4;
else  if  (iBits  <=  8)   wBitCount  =  8;
else   wBitCount  =  24;

GetObject(hBitmap,  sizeof(Bitmap),  (LPSTR)&Bitmap);
bi.biSize =  sizeof(BITMAPINFOHEADER);
bi.biWidth =  Bitmap.bmWidth;
bi.biHeight =  Bitmap.bmHeight;
bi.biPlanes =  1;
bi.biBitCount =  wBitCount;
bi.biCompression =  BI_RGB;
bi.biSizeImage =  0;
bi.biXPelsPerMeter =  0;
bi.biYPelsPerMeter =  0;
bi.biClrImportant =  0;
bi.biClrUsed =  0;

dwBmBitsSize  =  ((Bitmap.bmWidth  *  wBitCount  +  31)  /  32)  *  4  *  Bitmap.bmHeight;

//为位图内容分配内存
hDib  =  GlobalAlloc(GHND,dwBmBitsSize  +  dwPaletteSize  +  sizeof(BITMAPINFOHEADER));
lpbi  =  (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi  =  bi;

//  处理调色板
// hPal  =  GetStockObject(DEFAULT_PALETTE);
// if  (hPal)
// {
hDC  =  ::GetDC(NULL);
// hOldPal  =  ::SelectPalette(hDC,  (HPALETTE)hPal,  FALSE);
// RealizePalette(hDC);
// }

//  获取该调色板下新的像素值
GetDIBits(hDC,  hBitmap,  0,  (UINT)  Bitmap.bmHeight,  (LPSTR)lpbi  +  sizeof(BITMAPINFOHEADER)
+dwPaletteSize, (BITMAPINFO  *)lpbi,  DIB_RGB_COLORS);

//恢复调色板
// if  (hOldPal)
// {
// ::SelectPalette(hDC,  (HPALETTE)hOldPal,  TRUE);
// RealizePalette(hDC);
// ::ReleaseDC(NULL,  hDC);
// }

//创建位图文件
fh  =  CreateFile(FileName,  GENERIC_WRITE,0,  NULL,  CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL |  FILE_FLAG_SEQUENTIAL_SCAN,  NULL);

if  (fh  ==  INVALID_HANDLE_VALUE) return  FALSE;

//  设置位图文件头
bmfHdr.bfType  =  0x4D42;  //  "BM"
dwDIBSize  =  sizeof(BITMAPFILEHEADER)  +  sizeof(BITMAPINFOHEADER)  +  dwPaletteSize  +  dwBmBitsSize;
bmfHdr.bfSize  =  dwDIBSize;
bmfHdr.bfReserved1  =  0;
bmfHdr.bfReserved2  =  0;
bmfHdr.bfOffBits  =  (DWORD)sizeof(BITMAPFILEHEADER)  +  (DWORD)sizeof(BITMAPINFOHEADER)  +  dwPaletteSize;
//  写入位图文件头
WriteFile(fh,  (LPSTR)&bmfHdr,  sizeof(BITMAPFILEHEADER),  &dwWritten,  NULL);
//  写入位图文件其余内容
WriteFile(fh,  (LPSTR)lpbi,  dwDIBSize,  &dwWritten,  NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);

return  TRUE;
}

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调试易

在vc中怎么把自己在界面上画的保存为图片？

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