问从PPM文件加载的QImage显示不正确

EN

//... opens the file and pulling out headers & etc...

            unsigned char* data = new unsigned char[width*height*3];

            //Manual loading each byte into char array
            for(long h = 0; h < height; h++){ //for all 600 rows
                getline(readPPM,temp); //readPPM is an ifstream, temp is a string
                std::stringstream oneLine(temp);

                for(long w = 0; w < width*3; w++){ //to every position in that line 800*3
                    int readVal;
                    oneLine >> readVal; //string stream autofill get the int value instead of just one number
                    data[width*h+w] = (unsigned char)readVal; //put it into unsign char
                }
            }


            //Method 1: create the QImage with constructor 
(it blacked out 2/3 of the bottom of the image, and I'm not exactly familiar with QImage data type)
            imageData = QImage(data,width,height,QImage::Format_BGR888);

            //Method 2: manually setting each pixel
            for(int h = 0; h < height; h++){
                for(int w = 0; w < width; w++){
                    int r,g,b;
                    r = (int)data[width*h+w*3];
                    g = (int)data[width*h+w*3+1];
                    b = (int)data[width*h+w*3+2];
                    QColor color = qRgb(r,g,b);
                    imageData.setPixelColor(w,h,color);
                }
            }

//...set image to display...