程序代码：

bool ImageSize::LoadImage(string ImageName,int flag)
{
    if(0 == ImageName.length())
        return false;
    
    ifstream ffin(ImageName.c_str(),std::ios::binary);
    
    if(!ffin)
        return false;
    
    short s,s1;
    switch(flag)
    {
    case 0:
        bool bVal = isVaild(ffin);
        if(bVal == false)
            return false;
        
        ffin.seekg(6);
        ffin.read((char*)&s,2);
        ffin.read((char*)&s1,2);
        width = s;
        height = s1;
        break;
    }
    
    
    ffin.close();
    
    return true;
}