file operation

C

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

int main(){
    FILE * fp;
    char ch;
    char str[10];
    if((fp = fopen("test.csv", "r"))==NULL){
        printf("文件打开失败！\n");
        exit(1);
    };
    // fgetc 方法
    // while( ! feof(fp) ){
    //     ch = fgetc(fp);
    //     printf("%c", ch);
    // };

    // fgets 方法
    while( ! feof(fp) ){
        fgets(str, 10, fp);
        printf("%s", str);
    };

    fclose(fp);
}

C++

#include <iostream>
#include <fstream>

using namespace std;

int main(){
    const char * filename = "cat.jpg";
    ifstream infile;
    infile.open(filename, ios::in|ios::binary);
    // 检查是否打开成功
    if (!infile){
        cerr << "error: unable to open file" << endl;
        return -1;
    }
    // 计算尺寸
    long l, m;
    l = infile.tellg();
    cout << "begin pointer is " << l << endl;
    infile.seekg(0, ios::end);
    m = infile.tellg();
    cout << "end pointer is " << m << endl;
    cout << "size of " << filename << " is " << m-l << " bytes" << endl;
    infile.close();

    // 读入动态数组内, 并遍历输出
    long size;
    char * buffer;
    infile.open(filename, ios::in|ios::binary|ios::ate);
    size = infile.tellg();
    infile.seekg(0, ios::beg);
    buffer = new char [size];
    infile.read(buffer, size);
    for(int i=0; i<size; i++){
        cout << "buffer" << i << " is: " << buffer[i] << endl;
    }
    delete [] buffer;
    infile.close();
    
    return 0;

}