C++ OBJ 文件解析器

Question

我正在为 OBJ 文件制作一个文件解析器，所有内容都会进入正确的位置，但由于某种原因它不会运行到文件末尾。

    void loader::readIn()
{
    //!takes in the all the data and 
    //!puts in string first.
    std::string line;

    while(!myFile.eof())
    {

        linetype = unknown;//enum set to uknown
        line.clear(); // clear line
        ss.clear();  // clear string stream
        std::getline(myFile,line); //intake line , to string line

        //found = line.find("v "); //enum to check the line type i,e Face ,vertex
        if(line[0] == 'v') //! check to see if the first char is v
           {
             linetype = vertex;   

           }

    //  found = line.find("f ");
        if(line[0] == 'f') //! checkl to see if the first char is f
        {
            linetype = face;

        }

    //  found = line.find("vn ");
        if(line[0] == 'vn') //! checkl to see if the first char is vn 
        {

            linetype = vertexNormal;

        }
        //  found = line.find("vt ")
        if(line[0] == 'vt') //! checkl to see if the first char is vt
        {
            linetype = vertexTexture;

        }

            if(line[0] == ' ' || '#') // if the start of the line is empty or a #
        {
            line.clear();   //clear line
                std::getline(myFile,line); // intake the next line
        }



        switch(linetype)
        { 
        case vertex:     //!stores the verrtex floats in vert.

            ss >> vertexFloat[0] >> vertexFloat[1] >> vertexFloat[2];
            verts.push_back(new coordinate(vertexFloat[0],vertexFloat[1],vertexFloat[2])); //creates new coord
            linetype = unknown;
            break;

        case face:
            int n; // these are the counters for the float arrays
            int m;
            int b;
            n = 0;
            m = 0;
            b = 0;
            int faces[3];   //temperary float array
            int faceText[3];
            int faceNorm[3];
            ss.str(line);  //string stream  intake line
            ss.ignore(1); 
            while( !ss.eof())
            {

                ss >> faces[n]; // intake first umber
                n++;

                 if(ss.peek() == '/')
                 {
                     ss.ignore(1);

                     if(ss.peek() != '/')
                    { 
                      ss >> faceText[m];
                      m++;
                     }
                 }

                ss.ignore(1);
                ss >> faceNorm[b];
                b++;

             }


            for( int i = 0; i < 3 ; ++i)
            {
            totalFaces.push_back(faces[i]);  // push back all the ints on the correct
            faceTexture.push_back(faceText[i]); // vector
            faceNormal.push_back(faceNorm[i]);
            }
            break;

这是前 3 行代码，然后就停止了。我正在检查totalFaces向量，它接受每组3个中的第一个数字。

**f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9
f 1/2/3 4//6 7/8/9**

是我的 obj 文件。

Answer 1

eof()检查循环条件是不正确的。这不是一个预测，它表明之前的读取由于 EOF 而失败。例如，即使是空文件也不以.eoftrue 开头。

另外，“vn”既不是一个字符也不是两个字符。line[0]肯定是一个字符，显然不能等于两个字符“vn”。