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  1. /*****************************************************************
  2. Name : C 檔案<->結構 讀寫
  3. Date : 2017/06/17
  4. By   : CharlotteHonG
  5. Final: 2017/06/17
  6. *****************************************************************/
  7. #include <stdio.h>
  8. #include <stdlib.h>
  9. #include <string.h>
  10.  
  11. typedef struct {
  12.     int No;
  13.     char name [20];
  14.     char phoneNumber[30];
  15.     char Email_address[45];
  16. } Contact;
  17. // 新增一筆資料
  18. void app_Person(char* filename, Contact* con) {
  19.     char* lf="\n";
  20.     char* tok=",";
  21.  
  22.     char temp[32];
  23.     itoa(con->No, temp, 10);
  24.  
  25.     FILE *pFile = fopen(filename,"ab+");
  26.     fwrite(temp, sizeof(char), strlen(temp), pFile);
  27.     fwrite(tok, sizeof(char), strlen(tok), pFile);
  28.     fwrite(con->name, sizeof(char), strlen(con->name), pFile);
  29.     fwrite(tok, sizeof(char), strlen(tok), pFile);
  30.     fwrite(con->phoneNumber, sizeof(char), strlen(con->phoneNumber), pFile);
  31.     fwrite(tok, sizeof(char), strlen(tok), pFile);
  32.     fwrite(con->Email_address, sizeof(char), strlen(con->Email_address), pFile);
  33.     fwrite(lf, sizeof(char), strlen(lf), pFile);
  34.     fclose(pFile);
  35. }
  36. // 寫入通訊錄
  37. void write_Contacts(char* filename ,Contact* con, size_t len) {
  38.     FILE *pFile = fopen(filename,"wb+");
  39.     if(!pFile) {
  40.         perror("Error opening file");
  41.         exit(1);
  42.     }
  43.     fclose(pFile);
  44.     for(unsigned i = 0; i < len; ++i) {
  45.         app_Person(filename, con+i);
  46.     }
  47. }
  48. // 讀取通訊錄
  49. void read_Contacts(char* filename ,Contact* con, size_t len) {
  50.     FILE *pFile = fopen(filename,"rb");
  51.     if(!pFile) {
  52.         perror("Error opening file");
  53.         exit(1);
  54.     }
  55.     for(char buf[128], *pch; fgets(buf, 128, pFile) != NULL; ++con) {
  56.         pch = strtok (buf,",");
  57.         con->No = atoi(pch);
  58.         pch = strtok (NULL, ",");
  59.         strcpy(con->name, pch);
  60.         pch = strtok (NULL, ",");
  61.         strcpy(con->phoneNumber, pch);
  62.         pch = strtok (NULL, ",");
  63.         strcpy(con->Email_address, pch);
  64.     }
  65.     fclose(pFile);
  66. }
  67. // 讀取通訊錄RAW
  68. void read_ContactsRaw(char* filename, char* buf) {
  69.     FILE *pFile = fopen(filename,"rb");
  70.     if(!pFile) {
  71.         perror("Error opening file");
  72.         exit(1);
  73.     }
  74.     fseek(pFile, 0, SEEK_END);
  75.     long lSize = ftell(pFile);
  76.     rewind(pFile);
  77.     fread(buf, 1, lSize, pFile);
  78.     fclose(pFile);
  79. }
  80. // 印出結構
  81. void pri_person(Contact* con){
  82.     printf("%d, %s, %s, %s", con->No, con->name, con->phoneNumber, con->Email_address);
  83. }
  84. void pri_Contacts(Contact* con, size_t len){
  85.     for(unsigned i = 0; i < len; ++i) {
  86.         pri_person(con+i);
  87.     }
  88. }
  89. // 印出通訊錄
  90. int main(void) {
  91.     Contact w_con[2] = {
  92.         {1, "AAA", "0912345678", "AAA@gmail.com"},
  93.         {2, "BBB", "0912345678", "BBB@gmail.com"}
  94.     };
  95.     // 寫入通訊錄
  96.     write_Contacts("Contact.bin", w_con, 2);
  97.     // 讀取通訊錄
  98.     Contact r_con[2];
  99.     read_Contacts("Contact.bin", r_con, 2);
  100.     pri_Contacts(r_con, 2);
  101.     // 讀取檔案
  102.     char buf[256];
  103.     read_ContactsRaw("Contact.bin", buf);
  104.     printf("%s\n", buf);
  105. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments ()
stdin
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Standard input is empty
compilation info 
prog.c: In function ‘app_Person’:
prog.c:23:5: warning: implicit declaration of function ‘itoa’ [-Wimplicit-function-declaration]
     itoa(con->No, temp, 10);
     ^~~~
/home/0FNL6n/ccbTCZnK.o: In function `app_Person':
prog.c:(.text+0x1f): undefined reference to `itoa'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/b8vd27
C 檔案<->結構 讀寫
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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