將字符串轉換爲整數數組c

Question

我是這個主題的新手。 我想將整數數組轉換爲字符串。然後將字符串轉換爲整型數組，以檢查是否獲得相同的輸入。

gint16 frame[5] = {10, 2, 3, 7, 5}; 
char *str = malloc(sizeof(char) * (sizeof(frame)+1)); 
char *strp = str; 
size_t j; 
for (j= 0; j < sizeof(frame); j++) { 
    snprintf(strp, 4, "%02x", frame[j]); //hexadecimal 
     strp++; 
} 
// from hexa string to 16 bit integer array 
gint16 n_oframe[5]; 
size_t i_m; 
for (i_m = 0; i_m < 5; i_m++) { 
    char *d = (char*)malloc(sizeof(gint16)); 
    strncpy(d,str,2); 
    n_oframe[i_m] = atol(d); 
    str = str + 2; 
    free(d); 
} 

當我嘗試打印出來n_oframe值，我得到的正確的結果。請幫我

Answer 1

使用這些功能：

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

typedef int16_t gint16; // define gint16 if not compiling with glib.h 

char *gint16_to_string(gint16 *p, int n) { 
    char *str = malloc(n * 4 + 1); 
    if (str) { 
     for (int i = 0; i < n; i++) { 
      snprintf(str + i * 4, 5, "%04X", p[i] & 0xFFFF); 
     } 
    } 
    return str; 
} 

void string_to_gint16(gint16 *p, int n, const char *str) { 
    if (str) { 
     for (int i = 0; i < n; i++) { 
      unsigned int x = 0; 
      sscanf(str + i * 4, "%4x", &x); 
      p[i] = (gint16)x; 
     } 
    } 
} 

int main(void) { 
    gint16 frame[5] = { 10, 2, 3, 7, 5 }; 

    // encoding in hexadecimal 
    char *str = gint16_to_string(frame, 5); 
    printf("encoded string: %s\n", str); 

    // from hexa string to 16 bit integer array 
    gint16 n_oframe[5]; 
    string_to_gint16(n_oframe, 5, str); 

    printf("n_oframe: "); 
    for (int i = 0; i < 5; i++) { 
     printf("%d, ", n_oframe[i]); 
    } 
    printf("\n"); 

    free(str); 
    return 0; 
} 

Answer 2

的評論者發現，大多數的，所以把它放在一起

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

// ALL CHECKS OMMITTED! 

int main() 
{ 
    int16_t frame[5] = { 10, 2, 3, 7, 5 }; 
    // hexadecimal string = 2 characters plus NUL 
    // sizeof(char) == 1, if compiler is standard compliant 
    char *str = malloc(3 * (sizeof(frame)/sizeof(frame[0]) +1)); 
    char *strp = str; 
    size_t j; 
    for (j = 0; j < sizeof(frame)/sizeof(frame[0]); j++) { 
    // again: hexadecimal string = 2 characters plus NUL 
    snprintf(strp, 3, "%02x", frame[j]);  //hexadecimal 
    strp += 2; 
    } 
    // we need a pointer to the start of the string to free it later 
    strp = str; 
    // let's see if we gott all of them 
    printf("str = %s\n",str); 
    // from hexa string to 16 bit integer array 
    int16_t n_oframe[5]; 
    size_t i_m; 
    // and again: hexadecimal string = 2 characters plus NUL 
    // a simple char d[3]; would have been more than suffcient 
    // for the task, but if stack is precious... 
    char *d = (char *) malloc(3); 
    for (i_m = 0; i_m < 5; i_m++) { 
    // it's always the same, just do it once at the beginning 
    //char *d = (char *) malloc(3); 
    strncpy(d, str, 2); 
    // atol() is for base 10 input only, use strtol() instead 
    n_oframe[i_m] = (int16_t)strtol(d,NULL,16); 
    str = str + 2; 
    //free(d); 
    } 
    for (j = 0; j < 5; j++) { 
    printf("%d ", n_oframe[j]); 
    } 
    putchar('\n'); 

    free(d); 
    free(strp); 
    exit(EXIT_SUCCESS); 
} 

我改變gint16到int16_t，因爲我不知道那是什麼應該是。你很可能用gint16代替它，沒有問題。