如何使用 libjpeg 生成原始数据并创建 jpeg？

问：

我正在练习将 libjpeg 库用于一个单独的项目，我只想使用 libjpeg 生成一个蓝色的 100x100 jpeg 图像文件。我遵循了他们文档中的每个步骤，并在 .我已经利用 gdb 来更深入地挖掘正在发生的事情，但我在看到最初调用函数和下一步（在 中）之间发生的情况时遇到了问题。这是我的代码：jpeg_finish_compress()jpeg_finish_compress()

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "jpeglib.h"

int height = 100;
int width = 100;
int i, j;

int main() {
    //init the image
    unsigned char image[height][width][3];
    for(i = 0; i < height; i++) {
        for(j = 0; j < width; j++) {
            image[i][j][0] = 0x0;
            image[i][j][1] = 0x0;
            image[i][j][2] = 0xFF;
        }
    }


    //Create compression objects
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;

    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_compress(&cinfo);

    //Choose a destination and add error handling
    FILE *outfile = (FILE*) malloc(sizeof(FILE));
    char* filename = "test.jpeg";
    if(outfile == fopen(filename, "wb")) {
        fprintf(stderr, "can't open %s\n", filename);
        exit(1);
    }
    jpeg_stdio_dest(&cinfo, outfile);

    //Compression parameters
    cinfo.image_width = width;
    cinfo.image_height = height;
    cinfo.input_components = 3; //RGB. 1 if grayscale
    cinfo.in_color_space = JCS_RGB; //Could be JCS_GRAYSCALE also
    //Note: There are other compression parameters, but for most purposes, you can use:
    jpeg_set_defaults(&cinfo);

    //DO the compression
    jpeg_start_compress(&cinfo, TRUE);

    JSAMPROW row_pointer[1]; //pointer to a row with 12-bit precision

    while(cinfo.next_scanline < cinfo.image_height) {
        row_pointer[0] = *image[cinfo.next_scanline];
        jpeg_write_scanlines(&cinfo, row_pointer, 1);
    }
    
    jpeg_finish_compress(&cinfo);
    fclose(outfile); //close the file, responsibly
    
    jpeg_destroy_compress(&cinfo);
}

我认为这与我构建变量的方式有关，但也可能是我错误地使用了库。究竟是做什么的，如何从一组RGB数据中获取jpeg？imagejpeg_finish_compress