16,472
社区成员
发帖
与我相关
我的任务
分享
HBITMAP hBitmap = .....;
HBITMAP hOldBmp = (HBITMAP)::SelectObject(memdc,hBitmap);//将上面创建的位图选入内存DC中,返回Bitmap的指针并赋给hOldBmp
// lpszFileName:文件名
// saveDC:图片DC
// rc:图片大小
BOOL Save( LPCTSTR lpszFileName, HDC saveDC, RECT rc )
{
BITMAPFILEHEADER bf = { 0 };
BITMAPINFOHEADER bi = { 0 };
HDC hMemDC;
HBITMAP hBitmap;
LPBYTE lpBits;
bi.biSize = sizeof( BITMAPINFOHEADER );
bi.biBitCount = 24; // 保存为true color
bi.biWidth = rc.right - rc.left;
bi.biHeight = rc.bottom - rc.top;
bi.biPlanes = 1;
bi.biCompression = BI_RGB;
bi.biSizeImage = WIDTHBYTES( bi.biWidth, bi.biBitCount ) * bi.biHeight;
HDC hdc = GetDC(NULL);
if( !hdc )
{
return FALSE;
}
hBitmap = CreateDIBSection( hdc, ( CONST BITMAPINFO * )&bi, DIB_RGB_COLORS,( VOID ** )&lpBits, NULL, 0 );
if( !hBitmap )
{
ReleaseDC(NULL,hdc);
return FALSE;
}
hMemDC = CreateCompatibleDC( hdc );
HBITMAP hOldBmp = ( HBITMAP )SelectObject( hMemDC, hBitmap );
BitBlt( hMemDC, 0, 0, bi.biWidth, bi.biHeight, saveDC, rc.left, rc.top, SRCCOPY );
SelectObject( hMemDC, hOldBmp );
ReleaseDC( NULL, hdc );
DeleteDC( hMemDC );
bf.bfType = 0x4d42;
bf.bfSize = sizeof( BITMAPFILEHEADER ) + sizeof( BITMAPINFOHEADER )
+ bi.biSizeImage;
bf.bfOffBits = sizeof( BITMAPFILEHEADER ) + sizeof( BITMAPINFOHEADER );
DWORD dwWrite;
HANDLE fh = CreateFile( lpszFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL );
WriteFile( fh, ( LPBYTE )&bf, sizeof( BITMAPFILEHEADER ), &dwWrite, NULL );
WriteFile( fh, ( LPBYTE )&bi, sizeof( BITMAPINFOHEADER ), &dwWrite, NULL );
WriteFile( fh, ( LPBYTE )lpBits, bi.biSizeImage, &dwWrite, NULL );
DeleteObject( hBitmap );
return TRUE;
}
RECT rc;
rc.bottom = bm.bmHeight;
rc.left = 0;
rc.right = bm.bmWidth;
rc.top = 0;
Save(_T("C:\\A.BMP"),memdc,rc);