1、判断文件夹是否存在 //spath:文件夹路径名usingSystem.IO;if(Directory.Exists(spath)) { }else{ DirectoryInfo directoryInfo=newDirectoryInfo(spath); directoryInfo.Create(); } 2、判断文件是否存在 //filePath 文件路径名if(!File.Exists(filePath)) {//MessageBox.Show(filePath + " not exists!");Fil...
CreateFile用法和例子函数原型： 123456789HANDLE CreateFile( LPCTSTR lpFileName,...
1、CreateFile 是一个多功能的函数，可打开或创建以下对象，并返回可访问的句柄：控制台，通信资源，目录（只读打开），磁盘驱动器，文件，邮槽，管道。2、例程：include <windows.h>int main(){ HANDLE hf = CreateFile(TEXT("C:\\testa.bin"), GENERIC_WRITE, 0, 0, CREATE_ALWAYS, 0...
ENOENT Filename or path not found. EINVALInvalid parameter. 函数功能(MSDN): When used with files, the_accessfunction determines whether the specified file exists and can be accessed as specified by the value of mode(见下图表). When used with directories,_accessdetermines only whether the specifi...
if( (_access( "ACCESS.C", 2 )) != -1 ) printf( "File ACCESS.C has write permission " ); } } 输出: >>File ACCESS.C exists. >>File ACCESS.C has write permission 方法三:使用Windows API函数FindFirstFile(...) (1) 检查某一文件是否存在: ...
例子:create table kk(name char[30],fd int); (2)避免重复创建表 原型:create table if not exists 表名(列名 列的类型,列名 列的类型...); 例子:create table if not exists kk(name char[30],fd int); 查: .table .tables 删: 原型:drop table 表名; ...
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file that is posted.strFileName = oFile.PostedFile.FileName; strFileName = Path.GetFileName(strFileName);if(oFile.Value !="") {// Create the directory if it does not exist.if(!Directory.Exists(strFolder)) { Directory.CreateDirectory(strFolder); }// Save the uploaded file to the...
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For more information, see the C++ team blog post on multi-root workspaces and file-based API. Before generating the CMake cache, your custom or preferred tools might need to create a query file named .cmake/api/v1/query/client-MicrosoftVS/query.json in your build output folder (the ...