怎么样获得HBITMAP句柄的位图的数据流信息

[tjshif]

怎么样获得句柄HBITMAP的位图数据流信息；代码如下：

CRect Rect;
::GetWindowRect(hwnd,Rect);
HDC hSourceDC = ::GetDC(hwnd);
HDC hdc = ::CreateCompatibleDC(hSourceDC);

HBITMAP hCaptureBitmap = ::CreateCompatibleBitmap(hSourceDC, Rect.Width(), Rect.Height());
::BitBlt(hdc,0,0,Rect.Width(),Rect.Height(),hSourceDC,0,0,SRCCOPY);

怎么样获得hCaptureBitmap的位图数据流呢
我采用
BITMAP bm;
::GetObject(hCaptureBitmap,sizeof(bm),(LPVOID)&bm);
可是bm的bmBits为NULL
各位有什么办法嘛

[WecanHuang]

把结构头去掉就是位图的实际信息了

[Snow_Ice11111]

先把HBITMAP用CBitmap::FromHandle转为CBitmap*，再用CBitmap::GetBitmapBits获取。

[tjshif]

GetBitmapBits会进行一次内存拷贝，可以避免马

[Snow_Ice11111]

不想Copy内存中数据的话，就按一楼WecanHuang(曾阿牛)朋友的方法，bmp文件格式看这里：
http://community.csdn.net/Expert/topic/4614/4614713.xml?temp=9.312075E-02
希望能帮到你！

[Snow_Ice11111]

又没人回答了，唉，这的人也太。。。
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我不知道楼主以前在什么论坛上提问的，这里的人气太旺，贴子沉得太快，一两个小时后就到第二页了，大家就懒得翻了，回的人也少了，所以你希望有更多人关注的话可以隔段时间自己顶一下，一点点建议！

[jackwuwei]

BOOL SaveBitmap(HDC hDC,HBITMAP hBitmap,CString szPath)
{
FILE * fp= NULL;
fp = fopen(szPath.GetBuffer(1),"wb");
if(fp == NULL)
return false;

BITMAP Bm;
BITMAPINFO BitInfo;
ZeroMemory(&BitInfo, sizeof(BITMAPINFO));
BitInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
BitInfo.bmiHeader.biBitCount = 0;

if(!::GetDIBits(hDC, hBitmap, 0, 0, NULL, &BitInfo, DIB_RGB_COLORS))
return (false);

Bm.bmHeight = BitInfo.bmiHeader.biHeight;
Bm.bmWidth = BitInfo.bmiHeader.biWidth;

BITMAPFILEHEADER BmHdr;

BmHdr.bfType = 0x4d42; // 'BM' WINDOWS_BITMAP_SIGNATURE
BmHdr.bfSize = (((3 * Bm.bmWidth + 3) & ~3) * Bm.bmHeight)
+ sizeof(BITMAPFILEHEADER)
+ sizeof(BITMAPINFOHEADER);
BmHdr.bfReserved1 = BmHdr.bfReserved2 = 0;
BmHdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER)
+ sizeof(BITMAPINFOHEADER);

BitInfo.bmiHeader.biCompression = 0;
// Writing Bitmap File Header ////
fwrite(&BmHdr,sizeof(BITMAPFILEHEADER),1,fp);

fwrite(&BitInfo.bmiHeader,sizeof(BITMAPINFOHEADER),1,fp);

BYTE *pData = new BYTE[BitInfo.bmiHeader.biSizeImage + 5];
if(!::GetDIBits(hDC, hBitmap, 0, Bm.bmHeight,
pData, &BitInfo, DIB_RGB_COLORS))
return (false);
if(pData != NULL)
fwrite(pData,1,BitInfo.bmiHeader.biSizeImage,fp);

fclose(fp);
delete (pData);

return (true);
}

[tjshif]

又没人回答了，唉，这的人也太。。。

[bobob]

int GetObject(
HGDIOBJ hgdiobj, // handle to graphics object
int cbBuffer, // size of buffer for object information
LPVOID lpvObject // buffer for object information
);


If hgdiobj is a handle to a bitmap created by calling CreateDIBSection, and the specified buffer is large enough, the GetObject function returns a DIBSECTION structure. In addition, the bmBits member of the BITMAP structure contained within the DIBSECTION will contain a pointer to the bitmap's bit values.

If hgdiobj is a handle to a bitmap created by any other means, GetObject returns only the width, height, and color format information of the bitmap. You can obtain the bitmap's bit values by calling the GetDIBits or GetBitmapBits function.

[Leeu]

兄弟我综合你们的, 搞定了.谢谢


CFileDialog dlg(true,_T("BMP"),_T("bmp"),OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("*.bmp|*.bmp|*.*|*.*|"));

if (dlg.DoModal()!=IDOK)
return;
CString ss=dlg.GetPathName();
//m_bmp.LoadBitmap(ss);
hBmp=(HBITMAP)LoadImage(AfxGetInstanceHandle(),ss,
IMAGE_BITMAP,0,0,LR_LOADFROMFILE);

CBitmap *pBmp=CBitmap::FromHandle(hBmp);
BITMAP bm;
::GetObject(hBmp,sizeof(bm),(LPVOID)&bm);
m_bmWidth=bm.bmWidth;
m_bmHeight=bm.bmHeight;