这里的文件名是demo.txt。C 程序和demo.txt文件在同一个目录下。所以输出的结果是file exists。 如果C 程序位置和文件位置不同,我们必须指定文件的完整路径。 我们可以创建一个用户自定义函数,检查文件是否存在。下面是带有用户自定义函数的程序。 #include<stdio.h>intcheckIfFileExists(constchar*filename);intmain...
File.Exists(fileFullName)) { result = false; }else {//看看文件是否能用程序打开。 System.IO.FileStream fileStream = null;try { fileStream = System.IO.File.Open(fileFullName, System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite, System.IO.FileShare.None);//能正常打...
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#include "stdafx.h"即可 4. 使用Windows API PathFileExists #include "stdafx.h" #include <iostream> #include <windows.h> ...
Minimum supported server: Windows 2000 Server [desktop apps only] DLL: Shlwapi.dll (version 4.71 or later)*/#include<Windows.h>//Windows API FindFirstFile#include <Shlwapi.h>//Windows API PathFileExists#pragmacomment(lib, "shlwapi.lib")intmain(void) {if(PathFileExists("setting.ini")){ prin...
Using the fopen() Function to Check if a File Exists in C Using the stat() Function to Check if a File Exists in C Using the access() Function to Check if a File Exists in C Conclusion In the realm of C programming, the ability to check the existence of a file is a ...
if(access(file_name, F_OK ) != -1) {//file exists}else{//file doesn't exist} You can also useR_OK,W_OK, andX_OKin place ofF_OKto check for read permission, write permission, and execute permission (respectively) rather than existence, and you can OR any of them together (i.e...
Is this a good way to check wheter a file already exists? [snip] Testing whether a file exists often (not always, but often) means you're asking the wrong question. Why do you want to know whether the file exists? If it's so you can decide whether to attempt some operation (e....
* 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( (_...
EXISTS是CMake的内置函数,用于检查文件或目录是否存在。它的语法是if(EXISTS <file-or-directory>),其中<file-or-directory>是你想要检查的文件或目录的路径。如果指定的文件或目录存在,EXISTS函数会返回true,否则返回false。你可以在if语句中使用它来根据文件或目录是否存在来执行不同的操作。
Usually when you want to check if a file exists, it's because you want to create that file if it doesn't. Graeme Perrow's answer is good if you don't want to create that file, but it's vulnerable to a race condition if you do: another process could create the file in between ...