#include <iostream>#include <fstream>using namespace std;#define FILENAME "stat.dat"int main(){ 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: ...
* 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 )) != ...
C/C++中判断某一文件或目录是否存在 1.C++很简单的一种办法：#include <iostream>#include <fstream>using namespace std;#define FILENAME "stat.dat"int main(){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...
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); ...
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); ...
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#...
Check if a float is valid? check if directory exists Check if Iterator is valid Check if the value exist in the Registry. child process limits in service context and conhost.exe chkstk.asm is throwing an unhandled exception at start up cl.exe can't find stdlib.h on a 64 bit machine?
if(fp==NULL) { printf("ERROR: Open file %s failed.\n", filename); return 0; } fseek( fp, SEEK_SET, SEEK_END ); size=ftell(fp); fclose(fp); return size; } 没有想到的是,在程序执行后发现有的文件能正确的获取大小,而有的文件则不能正确的获取到文件大小,检查了代码,也没有发现有什么...
#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) :...