if (access(filename, F_OK) != -1) { printf("File exists\n"); } else { printf("File does not exist\n"); } return 0; } ``` 在上面的示例中,我们首先定义了一个文件名为test.txt,然后使用access函数来检查文件是否存在。如果文件存在,则输出“File exists”;否则输出“File does not exist...
if (access(file_path, F_OK) != -1) { printf("File %s exists.\n", file_path); } else { printf("File %s does not exist.\n", file_path); } return 0; } ``` 在上面的示例代码中,我们首先定义了一个文件路径`test.txt`,然后使用`access()`函数判断该文件是否存在。如果文件存在,则输...
1、判断文件夹是否存在 //spath:文件夹路径名 using System.IO; if (Directory.Exists(spath)) { } else { DirectoryInfo...directoryInfo = new DirectoryInfo(spath); di...
4.使用boost的filesystem类库的exists函数 复制代码代码如下: #include <boost/filesystem/operations.hpp> #include <boost/filesystem/path.hpp> #include <boost/filesystem/convenience.hpp> int GetFilePath(std::string &strFilePath) string strPath; int nRes = 0; //指定路径 strPath = "D:/myTest/T...
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("ACCESS.C",2))!=-1) printf("File ACCESS.C has write permission"); } } Output FileACCESS.C existsFileACCESS.C has write permission 3.在windows平台下用API函数FindFirstFile(...): (1)检查文件是否存在: #define_WIN32_WINNT 0x0400 ...
前面我们已经提到了,使用${}进行变量的引用。在 IF 等语句中,是直接使用变量名而不通过${}取值 二,cmake 自定义变量的方式: 主要有隐式定义和显式定义两种,前面举了一个隐式定义的例子,就是 PROJECT 指令,他会隐式的定义<projectname>_BINARY_DIR 和<projectname>_SOURCE_DIR 两个变量。
fflush/fclose都有刷新缓冲区的作用。...二、文件读取结束原因在C语言文件中,主要使用feof、ferror两个函数来判断文件读取结束的原因。...FILE* p = fopen("test.bin", "rb"); //判断文件是否被打开 if (p == NULL) { perror("fopen...", "wb"); //判断文件是否被打开 if (p == NULL) { ...
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set(test 100) if(test) message("var test exists and it's value is ${test}") endif() # 命令行中执行cmake .后的输出 var test not exists var test exists and it's value is 100 if(<string>) string为双引号括起来的字符串,除了以下两种情况外,其他情况均为假: ...