请问如何用cbitmap类在内存里，画一个图形，然后将该图形存成bmp文件

[myazhe]

请问如何用cbitmap类在内存里，画一个图形，然后将该图形存成bmp文件

[蒋晟]

Must use a memory DC

Command what is yours
Conquer what is not

[apcad]

http://www.vckbase.com/code/
找找吧，应该有你需要的！

[SoftSpider]

建立一个内存DC (CDC memDC)，然后将Bitmap选进DC ,这样可以在DC上画任何东西，然后可以
将这个Bimap存为文件．具体不明白可以再讨论．

[孤必有邻]

这里有个例子，把界面DC中的图像保存到文件，可以参考：
http://www.yangning.com/cgi-bin/topic.cgi?forum=1&topic=82&show=0

[flyelf]

画一个图形比较简单，要保存成bmp文件，就需要了解bmp文件的格式了

[bluebohe]

CBitmap bitmap;
HANDLE h=::LoadImage(0,"f:\\abc.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
bitmap.Attach(h);
CFile file("F:\\abc1.bmp",CFile::modeCreate|CFile::modeWrite);
CArchive ar(&file,CArchive::store);

BITMAP size;
bitmap.GetBitmap(&size);
int iHeight=size.bmHeight;
int iWidth=size.bmWidth;
int WIDTHBYTES;
unsigned char * pBitBuf=NULL;

WIDTHBYTES=(iWidth*3+3)/4*4;
pBitBuf=(unsigned char *)malloc(WIDTHBYTES*iHeight);



BITMAPFILEHEADER BitFileHead;
BITMAPINFOHEADER BitInfoHead;


BitInfoHead.biHeight=iHeight;
BitInfoHead.biWidth=iWidth;
BitInfoHead.biSizeImage=WIDTHBYTES*iHeight;
BitInfoHead.biSize = sizeof(BITMAPINFOHEADER);
BitInfoHead.biPlanes = 1;
BitInfoHead.biBitCount = 24;
BitInfoHead.biCompression = BI_RGB;
BitInfoHead.biXPelsPerMeter = 2952; // 75 DPI
BitInfoHead.biYPelsPerMeter = 2952; // 75 DPI
BitInfoHead.biClrUsed = 0;
BitInfoHead.biClrImportant = 0;

BitFileHead.bfType = 'MB'; // Non-portable... sigh
BitFileHead.bfSize = BitInfoHead.biSizeImage+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
BitFileHead.bfReserved1 = 0;
BitFileHead.bfReserved2 = 0;
BitFileHead.bfOffBits =sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);

BITMAPINFO mapinfo;
mapinfo.bmiHeader=BitInfoHead;
// mapinfo.bmiColors

HDC hdc = CreateIC (TEXT("DISPLAY"), NULL, NULL, NULL) ;
::GetDIBits (hdc, (HBITMAP)h,0, iHeight, pBitBuf, &mapinfo, DIB_RGB_COLORS) ;


file.Write(&BitFileHead,sizeof(BITMAPFILEHEADER));
file.Write(&BitInfoHead,sizeof(BITMAPINFOHEADER));
file.Write(pBitBuf,WIDTHBYTES*iHeight);

free(pBitBuf);



ar.Close();
file.Close();
bitmap.DeleteObject();

[bluebohe]

CBitmap bitmap;
HANDLE h=::LoadImage(0,"f:\\tzg.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
bitmap.Attach(h);
CFile file("F:\\tzg1.bmp",CFile::modeCreate|CFile::modeWrite);
CArchive ar(&file,CArchive::store);

BITMAP size;
bitmap.GetBitmap(&size);
int iHeight=size.bmHeight;
int iWidth=size.bmWidth;
int WIDTHBYTES;
unsigned char * pBitBuf=NULL;

WIDTHBYTES=(iWidth*3+3)/4*4;
pBitBuf=(unsigned char *)malloc(WIDTHBYTES*iHeight);



BITMAPFILEHEADER BitFileHead;
BITMAPINFOHEADER BitInfoHead;


BitInfoHead.biHeight=iHeight;
BitInfoHead.biWidth=iWidth;
BitInfoHead.biSizeImage=WIDTHBYTES*iHeight;
BitInfoHead.biSize = sizeof(BITMAPINFOHEADER);
BitInfoHead.biPlanes = 1;
BitInfoHead.biBitCount = 24;
BitInfoHead.biCompression = BI_RGB;
BitInfoHead.biXPelsPerMeter = 2952; // 75 DPI
BitInfoHead.biYPelsPerMeter = 2952; // 75 DPI
BitInfoHead.biClrUsed = 0;
BitInfoHead.biClrImportant = 0;

BitFileHead.bfType = 'MB'; // Non-portable... sigh
BitFileHead.bfSize = BitInfoHead.biSizeImage+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
BitFileHead.bfReserved1 = 0;
BitFileHead.bfReserved2 = 0;
BitFileHead.bfOffBits =sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);

BITMAPINFO mapinfo;
mapinfo.bmiHeader=BitInfoHead;
// mapinfo.bmiColors

HDC hdc = CreateIC (TEXT("DISPLAY"), NULL, NULL, NULL) ;
::GetDIBits (hdc, (HBITMAP)h,0, iHeight, pBitBuf, &mapinfo, DIB_RGB_COLORS) ;


file.Write(&BitFileHead,sizeof(BITMAPFILEHEADER));
file.Write(&BitInfoHead,sizeof(BITMAPINFOHEADER));
file.Write(pBitBuf,WIDTHBYTES*iHeight);

free(pBitBuf);



ar.Close();
file.Close();
bitmap.DeleteObject();

[shanjicn]

http://www.vckbase.com/document/viewdoc.asp?id=674
对你也许会有帮助！