| 发表于：2007-02-06 16:14:59 楼主 |
哪位朋友对gdi函数比较熟悉，帮个忙好吗，我有个函数是截取屏幕然后保存为bmp文件，我想修改这些代码，使保存的bmp文件为256色，或者单色，如果能压缩尺寸就更好了，我贴出代码，希望熟悉gdi的朋友帮个忙，急用啊 50分相送
我想不会修改太多地方的吧
int saveclienttofile（hwnd hwnd, lpctstr szfname)
{
hdc hdc, hmemdc;
handle hbits, hfile;
hbitmap hbitmap, htmpbmp;
hpalette hpal;
lpvoid lpbits;
rgbquad rgbquad;
dword imgsize, plsize, dwwritten;
int i, cres, height, width;
bitmapfileheader bmfh;
lpbitmapinfo pbminfo, pbminfomem;
lplogpalette lp;
if（（hfile = createfile（szfname, generic_write,0,null,create_always,file_attribute_normal,null)) == null)
return 1; //按照参数szfname指定的路径创建文件
//setcursor（loadcursor（null, idc_wait)); //我日，居然让鼠标成漏斗状
if（hwnd==hwnd_desktop)
{
width = getsystemmetrics（sm_cxscreen);
height = getsystemmetrics（sm_cyscreen);
}
else
{
rect rc;
getclientrect（hwnd,&rc);
width = rc.right-rc.left;
height = rc.bottom-rc.top;
}
hdc = getdc（hwnd); //获取指定的dc
hmemdc = createcompatibledc（hdc);
hbitmap= createcompatiblebitmap（hdc, width, height);
htmpbmp= createcompatiblebitmap（hdc, 8, 8);
pbminfomem = （lpbitmapinfo)globalalloc（ghnd, sizeof（bitmapinfo)+256*sizeof（rgbquad));
pbminfo = （lpbitmapinfo)globallock（pbminfomem);
selectobject（hmemdc, hbitmap);
bitblt（hmemdc,0,0,width,height,hdc,0,0,srccopy);
selectobject（hmemdc, htmpbmp);
zeromemory（pbminfo, sizeof（bitmapinfo));
pbminfo-> bmiheader.bisize = （dword)sizeof（bitmapinfoheader);
pbminfo-> bmiheader.biwidth = width;
pbminfo-> bmiheader.biheight = height;
pbminfo-> bmiheader.biplanes = 1;
pbminfo-> bmiheader.bibitcount = （word)getdevicecaps（hdc, bitspixel);
pbminfo-> bmiheader.bicompression = bi_rgb;
//pbminfo-> bmiheader.bicompression = bi_rle8;
getdibits（hdc, hbitmap, 0,height, null, pbminfo, dib_rgb_colors);
if（!pbminfo-> bmiheader.bisizeimage)
pbminfo-> bmiheader.bisizeimage = （（（（pbminfo-> bmiheader.biwidth * pbminfo-> bmiheader.bibitcount) + 31) & ~31) / 8)
* pbminfo-> bmiheader.biheight;
cres = getdevicecaps（hdc, sizepalette);
plsize = cres*sizeof（rgbquad);
imgsize= pbminfo-> bmiheader.bisizeimage;
bmfh.bftype = 0x4d42; // "bm "
bmfh.bfoffbits = plsize + sizeof（bitmapinfoheader) + sizeof（bitmapfileheader);
bmfh.bfsize = imgsize + bmfh.bfoffbits;
bmfh.bfreserved1 = 0;
bmfh.bfreserved2 = 0;
writefile（hfile, &bmfh, sizeof（bitmapfileheader), &dwwritten, null);
writefile（hfile, &（pbminfo-> bmiheader), sizeof（bitmapinfoheader), &dwwritten, null);
if（cres)
{
hpal=（hpalette)globalalloc（ghnd, sizeof（logpalette) + （cres*sizeof（paletteentry)));
lp=（lplogpalette)globallock（hpal);
lp-> palnumentries=（word)cres;
lp-> palversion=0x0300;
getsystempaletteentries（hdc, 0, cres, lp-> palpalentry);
rgbquad.rgbreserved=0;
for（i=0; i <cres; i++)
{
rgbquad.rgbred = lp-> palpalentry[i].pered;
rgbquad.rgbgreen = lp-> palpalentry[i].pegreen;
rgbquad.rgbblue = lp-> palpalentry[i].peblue;
writefile（hfile, &rgbquad, sizeof（rgbquad), &dwwritten, null);
}
globalunlock（hpal);
globalfree（hpal);
}
hbits = globalalloc（ghnd, pbminfo-> bmiheader.bisizeimage);
lpbits = （lpvoid)globallock（hbits);
getdibits（hdc, hbitmap, 0,height, lpbits, pbminfo, dib_rgb_colors);
writefile（hfile,lpbits,imgsize,&dwwritten,null);
globalunlock（hbits);
globalfree（hbits);
globalunlock（pbminfo);
globalfree（pbminfomem);
deleteobject（htmpbmp);
deleteobject（hbitmap);
deletedc（hmemdc);
releasedc（hwnd,hdc);
closehandle（hfile);
//setcursor（loadcursor（null,idc_arrow));
return 0;
}
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