1. 强大, 可配合FindNextFile(), FindClose(), 其中后者是必备. WIN32_FIND_DATA m_data; HANDLE hFile; hFile=FindFirstFile(filename,&m_data) if(hFile==INVALID_HANDLE_VALUE) //file not found Make sure you close the handle if the file is found. FindClose(hFile); 2. You can use SHGet...
例2下面的代码首先实例化一个 FileInfo 对象，然后使用该对象调用 FileInfo 类中的 Exists 属性判断 C 盘根目录下是否存在 Test.txt 文件。FileInfo finfo = new FileInfo("C:\\Test.txt");if（finfo.Exists）{ }02 创建文件创建文件可以使用 File 类的 Create 方法或者 FileInfo 类的 Create 方法来实现，...
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...
/* 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 )) != -1 )...
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: ...
complete the test mea complete tractor complete turnround of complete unsuccessful complete vector latti complete works completeantibody completed roentgenogr completed sales basis completed well completed work has completefertilizer completely absolute completely continuous completely customizab completely cut off...
(int argc,char *argv[]) { int ch,i; struct stat buf; opterr = 0; //解析命令...if(lflag)//ls -l file display_file(argv[i],argv[i]); else//...ls file printf("%s",argv[i]); printf("\n"); } return 0; } 编译 gcc test.c.../test -a test .test.c.bak test.c ....
control point adjustm control point curve control self-test control space control system design control the main cond control the main cond control transfer swit control vlan control your own devi controlbenchboard controlchangeminor controlcharacteristic controleerbaarheid controlhole controllable range con...
总结来说,Linux系统中的`if`语句可以很方便地判断文件是否存在、是否为空以及目录是否存在。我们可以通过`test`命令或方括号来实现这些条件判断,根据不同的结果执行相应的操作。通过灵活运用if语句,我们能够更好地控制程序的流程,提高工作效率。 希望通过本文的介绍,读者能够对Linux系统中if语句的文件判断有所了解,并能...
Example 8-1. A makefile separating source and binary that can be executed from the source tree SOURCE_DIR := /test/book/examples/ch07-separate-binaries-1 BINARY_DIR := /test/book/out/mp3_player_out # $(call source-dir-to-binary-dir, directory-list) source-dir-to-binary-dir = $(ad...