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)
#include <Shlwapi.h> //Windows API PathFileExists #pragma comment(lib, "shlwapi.lib") int main(void) { if(PathFileExists("setting.ini")){ printf("load custom setting...\n"); }else{ printf("setting file missing,load default..\n"); } return 0; } 1. 2. 3. 4. 5. 6. 7. 8...
*/#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 " ); /* Check for write permission */ if( (_access( "ACCESS.C", 2 )) != -1 ) printf( ...
判断文件夹是否存在 //spath：文件夹路径名 using System.IO; if (Directory.Exists(spath))...
{/*Check for existence*/if( (_access("ACCESS.C",0)) != -1) { printf("File ACCESS.C exists");/*Check for write permission*/if( (_access("ACCESS.C",2)) != -1) printf("File ACCESS.C has write permission"); } } 输出:>>File ACCESS.C exists.>>File ACCESS.C has write perm...
if (COMMAND cmd):如果 cmd 确实是命令并可调用为真; if (EXISTS dir) if (EXISTS file):如果目录或文件存在为真; if (file1 IS_NEWER_THAN file2):当 file1 比 file2 新,或 file1/file2 中有一个不存在时为真,文件名需使用全路径; if (IS_DIRECTORY dir):当 dir 是目录时为真; if (DEFINED...
CREATE TABLE IF NOT EXISTS STUDENT(Sno integer primary key, Sname text not null, Ssex text,Sage integer check(Sage>14),Sdept text default 'CS'); 该表的属性就是按照上一节表属性 执行结果: 查看表: 看到STUDENT,说明该表创建好了。【注意】 ...
if(EXISTSpath-to-file-or-directory) 如果文件或者目录存在返回True,否则返回False。 判断是不是目录[IS_DIRECTORY] if(IS_DIRECTORYpath) 此处目录的 path 必须是绝对路径[ 如/home/user/] 如果目录存在返回True,目录不存在返回False。 判断是不是软连接[IS_SYMLINK] ...
[HUAWEI]smart-upgrade right-nowInfo: Getting version information from houp, please wait ... Info: If you want to stop the upgrade, please press CTRL + C. Info: Downloading file basic-soft.cc ... Info: The file already exists, check whether it can be resumed from the breakpoint. Info...
definition name in "file-1"[, "file-2" ..., "file-n"] [nocheck "options"]; The options must be enclosed in quotes (" "). In the following example, the compiler locates the template function foo in foo.cc, and instantiates it. If a reinstantiation check is later required, the ...