How does VC ++ Save the customer zone as BMP [zz]

Add the following functions to the View class:

Bool ctestestview: writewindowtodib (lptstr szfile, cwnd * pwnd)

{

Cbitmap bitmap;

Cwindowdc DC (pwnd );

CDC memdc;

Crect rect;

Memdc. createcompatibledc (& DC );

Pwnd-> getwindowrect (rect );

Bitmap. createcompatiblebitmap (& DC, rect. Width (), rect. Height ());

Cbitmap * poldbitmap = memdc. SelectObject (& Bitmap );

Memdc. bitblt (, rect. Width (), rect. Height (), & DC, srccopy );

Cpalette pal;

If (DC. getdevicecaps (rastercaps) & rc_palette)

{

Uint nsize = sizeof (logpalette) + (sizeof (paletteentry) * 256 );

Logpalette * PLP = (logpalette *) New byte [nsize];

PLP-> palversion = 0x300;

PLP-> palnumentries = getsystempaletteentries (DC, 0,255, PLP-> palpalentry );

Pal. createpalette (PLP );

Delete [] PLP;

 

}

Memdc. SelectObject (poldbitmap );

Handle hdib = ddbtodib (bitmap, bi_rgb, & pal );

If (hdib = NULL)

Return false;

Writedib (szfile, hdib );

Globalfree (hdib );

Return true;

 

}

 

Handle ctestestview: ddbtodib (cbitmap & bitmap, DWORD dwcompression, cpalette * ppal)

{

Bitmap bm;

Bitmapinfoheader Bi;

Lpbitmapinfoheader lpbi;

DWORD dwlen;

Handle hdib;

Handle handle;

HDC;

Hpalette hpal;

Assert (bitmap. getsafehandle ());

If (dwcompression = bi_bitfields)

Return NULL;

Hpal = (hpalette) ppal-> getsafehandle ();

If (hpal = NULL)

Hpal = (hpalette) getstockobject (default_palette );

Bitmap. GetObject (sizeof (BM), (lpstr) & BM );

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. biclrimportant = 0;

Bi. biclrused = 0;

 

Int ncolors = (1 <bi. bibitcount );

If (ncolors> 256)

Ncolors = 0;

Dwlen = Bi. bisize + ncolors * sizeof (rgbquad );

HDC =: getdc (null );

Hpal = selectpalette (HDC, hpal, false );

Realizepalette (HDC );

Hdib = globalalloc (gmem_fixed, dwlen );

If (! Hdib)

{

Selectpalette (HDC, hpal, false );

: Releasedc (null, HDC );

Return NULL;

 

}

Lpbi = (lpbitmapinfoheader) hdib;

* Lpbi = Bi;

Getdibits (HDC, (hbitmap) bitmap. getsafehandle (), 0l, (DWORD) Bi. biheight, (lpbyte) null, (lpbitmapinfo) lpbi, (DWORD) B _dirgb_colors );

Bi = * lpbi;

If (Bi. bisizeimage = 0)

{

Bi. bisizeimage = (Bi. biwidth * bi. bibitcount) + 31 )&~ 31)/8) * bi. biheight;

If (dwcompression! = Bi_rgb)

Bi. bisizeimage = (Bi. bisizeimage * 3)/2;

}

 

Dwlen + = Bi. bisizeimage;

If (handle = globalrealloc (hdib, dwlen, gmem_moveable ))

Hdib = handle;

Else

{

Globalfree (hdib );

Selectpalette (HDC, hpal, false );

: Releasedc (null, HDC );

Return NULL;

}

Lpbi = (lpbitmapinfoheader) hdib;

Bool bgotbits = getdibits (HDC, (hbitmap) bitmap. getsafehandle (), 0l, (DWORD) Bi. biheight, (lpbyte) lpbi + (Bi. bisize + ncolors * sizeof (rgbquad )),

(Lpbitmapinfo) lpbi, (DWORD) dib_rgb_colors );

If (! Bgotbits)

{

Globalfree (hdib );

Selectpalette (HDC, hpal, false );

: Releasedc (null, HDC );

Return NULL;

}

Selectpalette (HDC, hpal, false );

: Releasedc (null, HDC );

Return hdib;

}

 

Bool ctestestview: 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;

HDR. bftype = (Word) ('M' <8) | 'B ');

HDR. bfsize =: globalsize (hdib) + sizeof (HDR );

HDR. bfreserved1 = 0;

HDR. bfreserved2 = 0;

HDR. bfoffbits = (DWORD) (sizeof (HDR) + lpbi-> bisize + ncolors * sizeof (rgbquad ));

File. Write (& HDR, sizeof (HDR ));

File. Write (lpbi, globalsize (hdib ));

Return true;

 

}

Call the writewindowtodib function when saving ()

Void ctestestview: onfilesave ()

{

// Todo: add your command handler code here

Writewindowtodib ("D: \ my.bmp", this );

}

 

I have tested it. You can add it directly, but note that the class name should be the same as yours.