如何将函数内的二维数组返回到C中的main(How do I return a 2D array inside a function to main in C)

 我读了一个文本文件并将内容存储在一个名为H的2D数组中，我需要将这个2D数组以某种方式返回到main，所以我可以在那里使用它并将其传递给其他函数。 我不知道如何让返回工作，也许使用指针。 我将readTxtFile函数设置为void函数来测试文件读取是否正常工作（它确实如此）但我无法对函数外部的2D数组做任何事情。 我有两个函数getRows（）和getCols（），我没有在这里显示，我可以，如果需要的话。 
 
 到目前为止，我的代码是： 
 
int main(void){

    //  int *H;
    //  H = readTxtFile("H.txt");
    readTxtFile("H.txt");
    return 0;
}

void readTxtFile(char *filename){
    int rows, cols;
    FILE *fp = fopen(filename, "r");
    if (!fp){
        perror("can't open H.txt\n");
        //return EXIT_FAILURE;
    }
    rows = getRows(fp);
    cols = getCols(fp);
    int (*H)[cols] = malloc(sizeof(int[rows][cols]));
    if(!H){
        perror("fail malloc\n");
        exit(EXIT_FAILURE);
    }

    for(int r = 0; r < rows; ++r){
        for(int c = 0; c < cols; ++c){
            if(EOF==fscanf(fp, "%d", &H[r][c])){
                fprintf(stderr, "The data is insufficient.\n");
                free(H);
                exit(EXIT_FAILURE);
            }
        }
    }
    fclose(fp);

    // printH(rows,cols,H);
    //  return H;


}
 
 这是文本文件的样子： 
 
1 1 0 1 0 0
0 1 1 0 1 0
1 0 0 0 1 1
0 0 1 1 0 1
2 2 2 2 2 2
 
 任何帮助，将不胜感激 

I read a text file and store the contents in a 2D array called H inside a function, I need to return this 2D array to main somehow so I can use it there and pass it to other functions. I'm not sure how to get the return to work, maybe using pointers. I made the readTxtFile function into a void function to test if the file reading was working (it does) but I can't do anything with the 2D array outside the function. I have two functions getRows() and getCols() that I didn't show here, I can if needed though. 
 
Heres my code so far:
 
int main(void){

    //  int *H;
    //  H = readTxtFile("H.txt");
    readTxtFile("H.txt");
    return 0;
}

void readTxtFile(char *filename){
    int rows, cols;
    FILE *fp = fopen(filename, "r");
    if (!fp){
        perror("can't open H.txt\n");
        //return EXIT_FAILURE;
    }
    rows = getRows(fp);
    cols = getCols(fp);
    int (*H)[cols] = malloc(sizeof(int[rows][cols]));
    if(!H){
        perror("fail malloc\n");
        exit(EXIT_FAILURE);
    }

    for(int r = 0; r < rows; ++r){
        for(int c = 0; c < cols; ++c){
            if(EOF==fscanf(fp, "%d", &H[r][c])){
                fprintf(stderr, "The data is insufficient.\n");
                free(H);
                exit(EXIT_FAILURE);
            }
        }
    }
    fclose(fp);

    // printH(rows,cols,H);
    //  return H;


}
 
This is what the text file looks like:
 
1 1 0 1 0 0
0 1 1 0 1 0
1 0 0 0 1 1
0 0 1 1 0 1
2 2 2 2 2 2
 
Any help would be appreciated

原文：https://stackoverflow.com/questions/40090326