/** 从BMP图像文件数据流中生成IPLIMAGE对象
*/
IplImage* GetIplFromBmp(BYTE* pBmp, DWORD size)
{
    BYTE* p = pBmp;
    BITMAPFILEHEADER fheader;
    memcpy(&fheader, p, sizeof(BITMAPFILEHEADER));
    BITMAPINFOHEADER bmphdr;
    p += sizeof(BITMAPFILEHEADER);
    memcpy(&bmphdr, p, sizeof(BITMAPINFOHEADER));
    int w = bmphdr.biWidth;
    int h = bmphdr.biHeight;
    
    p = pBmp + fheader.bfOffBits;
    
    //reverse(p, w, h);
    IplImage* pIpl = cvCreateImage(cvSize(w,h),8,3);
    
    memcpy(pIpl->imageData, p, w * h * 3 *sizeof(char));
    return pIpl;
}

/** 从IPLIMAGE对象中生成BMP的图像文件流
*/
bool GetBmpFromIpl(IplImage* pIpl, BYTE* &pBmp, DWORD& size)
{
    BITMAPFILEHEADER bfh = {0};
    DWORD dwImageSize = 0;
    DWORD dwBytesRead = 0;
    
    int w = pIpl->width;
    int l = ((w * 24 +31) & ~31) /8;
    int h = pIpl->height;
    dwImageSize    = l * h;
    
    bfh.bfType        = (WORD)'M' << 8 | 'B';            //定义文件类
    bfh.bfOffBits    = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);    //定义文件头大小
    bfh.bfSize        = bfh.bfOffBits + dwImageSize;        //文件大小
    
    BITMAPINFOHEADER  bih = {0};
    bih.biSize = sizeof(BITMAPINFOHEADER);
    bih.biWidth = pIpl->width;
    bih.biHeight = pIpl->height;
    bih.biPlanes = 1;
    bih.biBitCount = 24;
    bih.biCompression = BI_RGB;
    bih.biSizeImage    = 0;
    bih.biXPelsPerMeter    = 0;
    bih.biYPelsPerMeter    = 0;
    bih.biClrUsed = 0;
    bih.biClrImportant = 0;
    
    size = bfh.bfSize;
    pBmp = new BYTE[bfh.bfSize+1];
    
    memset(pBmp, 0, bfh.bfSize + 1);
    memcpy(pBmp, &bfh, sizeof(BITMAPFILEHEADER));
    memcpy(pBmp+sizeof(BITMAPFILEHEADER), &bih, sizeof(BITMAPINFOHEADER));
    BYTE* p = pBmp+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
    memcpy(p, (BYTE*)pIpl->imageData, dwImageSize);

    return true;
}