opencv根据图像的二进制内存创建Mat

opencv根据图像的二进制内存创建Mat
例如 文件sPicPath是jpg格式的文件但不带扩展名，
或者只有其它模块获得的图像数据（jpg等）的情况下可以参考下面代码生成Mat
cv::Mat CMy2CRecorderDlg::MyReadPic(CString sPicPath)
{
Mat matImg;
//读取文件流
FILE* read_image = fopen(CString2string(sPicPath).c_str(), “rb”);
if (read_image == NULL)
return matImg;

fseek(read_image, 0, SEEK_END);
int fileLen = ftell(read_image);
fseek(read_image, 0, SEEK_SET);
if (fileLen <= 0)
{
	fclose(read_image);
	return matImg;
}

unsigned char* pre_image = new unsigned char[fileLen];
size_t data = fread(pre_image, 1, fileLen, read_image);
fclose(read_image);

//去掉前面11位加密头
vector buffer(pre_image, pre_image + data);
matImg = imdecode(buffer, IMREAD_ANYCOLOR);

delete[]pre_image;

return matImg;

}