写BMP文件格式

FILE *fp; // 定义一个文件指针
     BMP_HEADER bmpHeader; // 定义一个 BMP 文件头的结构体
     BMP_INFO bmpInfo; // 定义一个 BMP 文件信息结构体    if((fp = fopen(BMPFile.c_str(), "wb")) == NULL){
         MSG("Cann't open the file!","Error",MB_OK);
         return -1;
     }    bmpInfo.bSize = 40;  //固定
     bmpInfo.bWidth = Width;
     bmpInfo.bHeight = Height;
     bmpInfo.bBitCount = BitCount;    //计算四字节对齐的宽度*高度
     long ImageSize4bytes;
     ImageSize4bytes = bmpInfo.bWidth*sizeof(BMP_POINT);    if(ImageSize4bytes % 4!=0){ImageSize4bytes += 4-(ImageSize4bytes % 4);}
     ImageSize4bytes *= bmpInfo.bHeight;
     
     bmpInfo.bImageSize = ImageSize4bytes;
     bmpInfo.bCompression = 0;
     bmpInfo.bClrImportant = 0;
     bmpInfo.bClrUsed = 0;
     bmpInfo.bXPelsPerMeter = 0;
     bmpInfo.bYPelsPerMeter = 0;
     bmpInfo.bPlanes = 1; // 调色板数量    bmpHeader.bType = 0x4D42; //BM ascii码
     bmpHeader.bOffset = 54;
     bmpHeader.bSize = bmpInfo.bImageSize + bmpHeader.bOffset;
     bmpHeader.bReserved1 = 0;
     bmpHeader.bReserved2 = 0;    //让 fp 指向 bmp 文件的开始
     //第 2 个参数是偏移量 第三个参数是文件起始地址 所以此函数执行成功后文件指
     fseek(fp, 0, SEEK_SET);
     // 写入文件
     fwrite(&bmpHeader, sizeof(bmpHeader), 1, fp);
     fwrite(&bmpInfo, sizeof(bmpInfo), 1, fp);
     fwrite(pData, 1, bmpInfo.bImageSize, fp);    fclose(fp);