图像保存为二进制文件及二进制文件读出图像数据

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[先在循环外定义static int save_count]
save_count++;
        std::string ssave_cnt = std::to_string(save_count);
        std::string file_name =  ssave_cnt+".bin";
        //保存rgba数据--------------------------
            FILE *fpw = fopen(file_name.c_str(), "wb");
            if ( fpw == NULL )
            {
                std::cout << "Open error!" << std::endl;
                fclose(fpw);
                return;
            }
            if ( !img_rgba.data || img_rgba.channels() != 4 )
            {
                std::cout << "Image read failed or image channels isn‘t equal to 3."
                << std::endl;
                return;
            }
            
            int labelw = 1;
            int rows = img_rgba.rows;
            int cols = img_rgba.cols;
            
            fwrite( &labelw, sizeof(char), 1, fpw );
            
            char* dp = (char*)img_rgba.data;
            for ( int i=0; i<rows*cols; i++ )
            {
                fwrite( &dp[i*4],   sizeof(char), 1, fpw );
                fwrite( &dp[i*4+1], sizeof(char), 1, fpw );
                fwrite( &dp[i*4+2], sizeof(char), 1, fpw );
                fwrite( &dp[i*4+3], sizeof(char), 1, fpw );
            }
            fclose(fpw);

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        save_count++;
        std::string ssave_cnt = std::to_string(save_count);
        std::string file_name =  "/Users/gd-npc-701/Desktop/bin_files/"+ssave_cnt+".bin";
        
        
        int rows = 1920;
        int cols = 1080;
        FILE *fpr = fopen( file_name.c_str(), "rb" );
        if ( fpr == NULL )
        {
            std::cout << "Open error!" << std::endl;
            fclose(fpr);
            return;
        }
        
        int labelr(0);
        fread( &labelr, sizeof(char), 1, fpr );
        
        std::cout << "label: " << labelr << std::endl;
        
        cv::Mat img_rgba_from_bin( rows, cols, CV_8UC4, cv::Scalar::all(0) );
        
        unsigned char* pData = (unsigned char*)img_rgba_from_bin.data;
        for ( int i=0; i<rows*cols; i++ )
        {
            fread( &pData[i*4],   sizeof(char), 1, fpr );
            fread( &pData[i*4+1], sizeof(char), 1, fpr );
            fread( &pData[i*4+2], sizeof(char), 1, fpr );
            fread( &pData[i*4+3], sizeof(char), 1, fpr );

        }
        fclose(fpr);