如何保存CBitmap对象到磁盘文件*.bmp

[nothank]

[土豆]

table(天刹孤星)的方法较好，
tangl_99(Min-Kyeong)恐怕有问题，要是文件是低于256色的你这样处理不就错了，没有考虑到调色板吧

[wmouse]

好像可以在Resourse中的Stringtable中改一下，但具体细节我忘了。而且此法只是限制存储格式，我只对CDib稍有了解。

[五行擒拿术]

BOOL CCovImage::SaveBitmapToFile(HBITMAP hBitmap, LPCTSTR lpFileName , HDC hWndDC )
{
HDC hDC; //设备描述表
int iBits; //当前显示分辨率下每个像素所占字节数
WORD wBitCount; //位图中每个像素所占字节数
DWORD dwPaletteSize=0, //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
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap; //位图属性结构
BITMAPFILEHEADER bmfHdr; //位图文件头结构
BITMAPINFOHEADER bi; //位图信息头结构
LPBITMAPINFOHEADER lpbi; //指向位图信息头结构

HANDLE fh, hDib, hPal,hOldPal=NULL; //定义文件，分配内存句柄，调色板句柄

//计算位图文件每个像素所占字节数
//hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
hDC = ::CreateCompatibleDC( hWndDC ) ;
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 if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 24 ;

//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) * sizeof(RGBQUAD);

//设置位图信息头结构
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.biClrUsed = 0;
bi.biClrImportant = 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,
(LPBITMAPINFO )
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(lpFileName, 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;

}

[HashCodeWithJava]

void CAppDlg::WriteBmp(CBitmap *PBitmap)
{
BITMAPINFO *m_pBMI;
BYTE *m_pDIBData;
BITMAPFILEHEADER bfh;
BITMAPINFOHEADER bi;
BITMAP BM;
PBitmap->GetObject(sizeof(BM),&BM);
CClientDC dc(this);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = BM.bmWidth;
bi.biHeight = BM.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = 24;
bi.biCompression = 0;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;

bfh.bfType=0x4d42;
bfh.bfOffBits=sizeof(bfh)+sizeof(BITMAPINFOHEADER);
bfh.bfSize=bfh.bfOffBits+BM.bmWidth*BM.bmHeight*3;
bfh.bfReserved1=0;
bfh.bfReserved2=0;

m_pBMI=(BITMAPINFO*)new char[sizeof(BITMAPINFO)];
m_pDIBData=(BYTE*)new char[bfh.bfSize-bfh.bfOffBits];

memcpy(m_pBMI,&bi,sizeof(BITMAPINFOHEADER));
GetDIBits(dc.GetSafeHdc(), (HBITMAP)PBitmap->GetSafeHandle(), 0l, (DWORD)bi.biHeight,
(LPVOID)m_pDIBData,(LPBITMAPINFO)m_pBMI, (DWORD)DIB_RGB_COLORS);
CFile file;
if(!file.Open(m_FileName,CFile::modeCreate|CFile::modeWrite))
{
MessageBox("error!");
return;
}
file.Write(&bfh,sizeof(bfh));
file.Write(m_pBMI,sizeof(BITMAPINFOHEADER));
file.Write(m_pDIBData,BM.bmWidth*BM.bmHeight*3);
file.Close();
}

[wistaria]

http://www.csdn.net/expert/topic/65/65798.shtm

[litian]

我有一个读写图象文件的类，可以读写bmp，jpeg，gif文件等。

[nothank]

tuktkuk

[qingyidance]

Thank you!