c – ifstream未能打开

所以我必须打开一个.ppm图像文件并对它做一些工作,但是我试图用来读取数据的ifstream无法打开图像文件.我很确定图像文件在工作目录中(我已经创建并读取了一些简单的.txt文件以确保).即使经过过度研究,我也无法弄清楚发生了什么.

这是相关的代码

编辑：我添加了一些代码来了解我正在尝试做什么

Image * PPMImageReader::read(std::string filename){

        std::string line;
        int width,height,max_val;


        std::ifstream src(filename,std::ios_base::binary);



        if (src.fail()) { //failbit is always set but not badbit
            perror("Logical error on i/o operation. failbit was setn");
            if (src.bad())
                perror("Read/writing error on i/o operation. badbit was set");
        } 
        if (!src.is_open()) { //and of course this return true
            printf("File was not openedn");
            exit(1);
        }

     //Edited

     getline(src,line,'n');

        if (line.empty())
            getline(src,line);

        if (line.find("P6") == std::string::npos) {
            printf("wrong formatn");
            exit(1);
        }