c說話讀取csv文件和c++讀取csv文件示例分享

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C讀取csv文件

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

char *trim(char *str)
{
    char *p = str;
    while (*p == ' ' || *p == '\t' || *p == '\r' || *p == '\n')
        p ++;
    str = p;
    p = str + strlen(str) - 1;
    while (*p == ' ' || *p == '\t' || *p == '\r' || *p == '\n')
        -- p;
    *(p + 1) = '\0';
    return str;
}

int main()
{
 FILE *fp = fopen("test.csv", "r");
 if(fp == NULL) {
  return -1;
 }

 char line[1024];
 while(fgets(line, sizeof(line), fp)) {
  //printf("%s", line);

  char *save_ptr;
  char *name = strtok_r(line, ",", &save_ptr);
  if (name == NULL) {
   return -1;
  }  
  char *age = strtok_r(NULL, ",", &save_ptr);
  char *birthday = strtok_r(NULL, ",", &save_ptr);
  printf("%s\t%s\t%s\n", trim(name), trim(age), trim(birthday));
 }

 return 0;
}

C++讀取csv文件

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>

using namespace std;

string Trim(string& str)
{
 str.erase(0,str.find_first_not_of(" \t\r\n"));

 str.erase(str.find_last_not_of(" \t\r\n") + 1);

 return str;
}

int main()
{
 ifstream fin("test.csv");

 string line; 
 while (getline(fin, line)) {
  //cout << line << endl;

  istringstream sin(line); 
  vector<string> fields; 
  string field;
  while (getline(sin, field, ',')) {
   fields.push_back(field); 
  }

  string name = Trim(fields[0]); 
  string age = Trim(fields[1]); 
  string birthday = Trim(fields[2]); 
  cout << name << "\t" << age << "\t" << birthday << endl;
 }
}


csv文件

alice, 22, 1992/03/05
bob, 33, 1981/11/21
cart, 40, 1974/07/13