读取PPM图像文件(P3)，并使用C++将输出写入file

#include <iostream>
#include <fstream>
#include <string>

struct Pixel {
    int r, g, b;
};

int main() {
    std::ifstream inputFile("input.ppm");
    std::ofstream outputFile("output.ppm");

    if (!inputFile) {
        std::cerr << "Failed to open input file." << std::endl;
        return 1;
    }

    if (!outputFile) {
        std::cerr << "Failed to create output file." << std::endl;
        return 1;
    }

    std::string format;
    int width, height, maxPixelValue;

    // Read file header
    inputFile >> format >> width >> height >> maxPixelValue;

    // Write file header to output file
    outputFile << format << std::endl;
    outputFile << width << " " << height << std::endl;
    outputFile << maxPixelValue << std::endl;

    // Create image data structure
    Pixel** image = new Pixel*[height];
    for (int i = 0; i < height; i++) {
        image[i] = new Pixel[width];
    }

    // Read pixel values
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            inputFile >> image[i][j].r >> image[i][j].g >> image[i][j].b;
        }
    }

    // Process image data (if needed)

    // Write processed image data to output file
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            outputFile << image[i][j].r << " " << image[i][j].g << " " << image[i][j].b << " ";
        }
        outputFile << std::endl;
    }

    // Clean up
    for (int i = 0; i < height; i++) {
        delete[] image[i];
    }
    delete[] image;

    // Close files
    inputFile.close();
    outputFile.close();

    return 0;
}