在这个示例中,我们首先包含了<iostream>和<fstream>头文件,我们定义了一个字符串变量filename,用于存储要检查的文件名,接着,我们创建了一个ifstream对象file,并将filename作为参数传递给它,我们使用file.good()方法来判断文件是否存在,如果文件存在,file.good()方法返回true,否则返回false。 小标题:捕获异常 在某些情...
* file named "ACCESS.C" to see if it exists and if * writing is allowed.*/#include<io.h>#include<stdio.h>#include<stdlib.h>voidmain(void) {/*Check for existence*/if( (_access("ACCESS.C",0))!=-1) { printf("File ACCESS.C exists");/*Check for write permission*/if( (_acces...
* file named "ACCESS.C" to see if it exists and if * writing is allowed. */ #include <io.h> #include <stdio.h> #include <stdlib.h> void main( void ) { /* Check for existence */ if( (_access( "ACCESS.C", 0 )) != -1 ) { printf( "File ACCESS.C exists " ); /* C...
/* ACCESS.C: This example uses _access to check the * file named "ACCESS.C" to see if it exists and if * writing is allowed. */ #include <io.h> #include <stdio.h> #include <stdlib.h>void main( void ) { /* Check for existence */ if( (_access( "ACCESS.C", 0 )) != ...
fstream _file; _file.open(FILENAME,ios::in); if(!_file) cout<<FILENAME<<"没有被创建"; else cout<<FILENAME<<"已经存在"; return 0; 2.利用 c 语言的库的办法: 函数名: access 功能: 确定文件的访问权限 用法: int access(const char *filename, int amode); ...
fstream _file; _file.open(FILENAME,ios::in); if(!_file) { cout<<FILENAME<<"没有被创建"; } else { cout<<FILENAME<<"已经存在"; } return0; } 2.利用 c 语言的库的办法: 函数名: access 功能: 确定文件的访问权限 用法: int access(const char *filename, int amode); ...
2 #include <fstream> 3 4using namespace std;5 6#define FILENAME "*.dat" // 指定⽂件名 7 8int main( void )9 { 10 fstream _file;11 _file.open(FILENAME, ios::in);12if(!_file)13 { 14 cout<<FILENAME<<"没有被创建!"<<endl;15 } 16else 17 { 18 cou...
使用c++标准库#include "stdafx.h"#include <iostream>#include <fstream>using namespace std;#define FILENAME "C:\\windows"int main(){ fstream file; file.open(FILENAME,ios::in); if(!file) { cout<<FILENAME<<"存在"; } else { cout<<FILENAME<<"不存在"; } return 0;}gcc编译去掉#...
一个c病毒源代码 include <windows.h> include <Shlwapi.h> include <fstream.h> include <TlHelp32.h> include <Dbt.h> pragma comment(lib,"shlwapi.lib")define TIMER 1//计时器 //function LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//窗口过程 //获取盘符 TCHAR FirstDrive...
#include <iostream> #include <fstream> #include <cstdint> #include <experimental/filesystem> namespace fs = std::experimental::filesystem; void demo_exists(const fs::path& p, fs::file_status s = fs::file_status{}) { std::cout << p; if(fs::status_known(s) ? fs::exists(s) :...