函數調用使用字符串文字但不帶字符串變量C

Question

我試圖從file1.txt中的id代碼服務器獲取一些數據。如果我使用字符串文字d.id = "ABC"，則電話號碼fetchData(&d)工作得很好，但如果在從文件中讀取它們後使用包含每個id的變量array[idx]，則不起作用。任何人都可以給我一個暗示我做錯了什麼（不知道內部的fetchData()）？我正在學習C，請耐心等待。

的file1.txt看起來像這樣的內容：

ABC 
DEF 
... 

我的代碼如下：

/* #include "myapi.h" */ //fetchData 

#include <stdlib.h> 
#include <stdio.h> 
#include <string.h> 

typedef struct param { 
     char *id; 
    } param_t; 

int countlines(char filename[]) 
{ 
    // count the number of lines in the file called filename          
    FILE *fp = fopen(filename,"r"); 
    int ch=0; 
    int lines=0; 

    while(!feof(fp)) 
    { 
     ch = fgetc(fp); 
     if(ch == '\n') 
    { 
     lines++; 
    } 
    } 

    fclose(fp); 
    return lines; 
} 

int main() 
{ 

    char filename[] = "file1.txt"; 
    int N = countlines(filename); 

    // open the file for reading 
    FILE *file = fopen(filename, "r"); 

    // make sure the file opened properly 
    if(NULL == file) 
    { 
     fprintf(stderr, "Cannot open file: %s\n", filename); 
     return 1; 
    } 

    size_t buffer_size = 10; 

    /* create an array of char pointers */ 
    char **array = malloc(N * buffer_size * sizeof(char*)); 

    /* allocate space for each string: */ 
    int line_number = 0; 
    for (line_number = 0; line_number < N; ++line_number) { 
    array[line_number] = (char *)malloc(buffer_size+1); 
    } 

    // read each line into the string array 
    line_number = 0; 
    while(-1 != getline(&(array[line_number]), &buffer_size, file)) 
    ++line_number; 

    fclose(file); 

    param_t d, dempty; 

    memset(&d, 0, sizeof d); 
    memset(&dempty, 0, sizeof dempty); 

    int idx; 
    for (idx=0; idx<N; idx++) 
    { 

     if(!(d.id = malloc(strlen(array[idx]) + 1))) 
    { 
     //allocation failed 
    } 

     /* if initialized with string literals the data request works */ 
     d.id= "ABC"; 

     /* if d is initialized with a variable the data request doesn't work */ 
     // strcpy(d.id, array[idx]); 

     fetchData(&d); 

     /* reset structure*/ 
     d = dempty; 

    } 

    /*free memory */ 
    for (;idx>=0;idx--) 
     free(array[idx]); 
    free(array); 

    return 0; 
} 

編輯：我的問題得到了每個array[idx]取出\n字符後解決。

Answer 1

我的問題得到了每個array[idx]