search
HomeDatabaseMysql TutorialVC判断文件目录是否存在

VC判断文件目录是否存在

Jun 07, 2016 pm 03:32 PM
httpjudgmentaddressexistdocumentTable of contents

原文地址::http://blog.csdn.net/pgshow/article/details/7684822 相关网帖 1、VC中 判断 目录 , 文件 是否 存在 ,创建 目录 的方法 ----http://www.cnblogs.com/kiddo/archive/2007/09/03/879950.html 1. 使用_ access 函数,函数原型为 int _access( const

原文地址::http://blog.csdn.net/pgshow/article/details/7684822

 

 相关网帖

1、VC中判断目录,文件是否存在,创建目录的方法 ----http://www.cnblogs.com/kiddo/archive/2007/09/03/879950.html

 

 

1. 使用_access函数,函数原型为 int _access( const char *path, int mode );


2. 使用CreateFile函数,函数原型为:

HANDLE CreateFile( LPCTSTR lpFileName, // pointer to name of the file DWORD dwDesiredAccess, // access (read-write) mode DWORD dwShareMode, // share mode LPSECURITY_ATTRIBUTES lpSecurityAttributes, // pointer to security attributes DWORD dwCreationDisposition, // how to create DWORD dwFlagsAndAttributes, // file attributes HANDLE hTemplateFile // handle to file with attributes to // copy );
3. 使用FindFirstFile函数,函数原型为: HANDLE FindFirstFile( LPCTSTR lpFileName, // pointer to name of file to search for LPWIN32_FIND_DATA lpFindFileData // pointer to returned information );
//例子:

BOOL CPubFunc::DirectoryExist(CString Path)
{
 WIN32_FIND_DATA fd;
 BOOL ret = FALSE;
    HANDLE hFind = FindFirstFile(Path, &fd);
    if ((hFind != INVALID_HANDLE_VALUE) && (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
    {  //目录存在
            ret = TRUE;    
    }
   FindClose(hFind);
 return ret;
}
 4. 使用GetFileAttributes函数,函数原型如下: DWORD GetFileAttributes( LPCTSTR lpFileName // pointer to the name of a file or directory );
5. 使用Shell Lightweight Utility APIs函数 PathFileExists()专门判断文件目录时否存在的函数文件名可读性比较强还可以判断目录是否存在 Header: Declared in Shlwapi.h Import Library: Shlwapi.lib 以上的各种方法供参考,函数具体用法需参见MSDN。
//这是MSDN中的例子:
#include
#include
#include "Shlwapi.h"

void main( void )
{
// Valid file path name (file is there).
char buffer_1[] = "C:\\TEST\\file.txt";
char *lpStr1;
lpStr1 = buffer_1;
// Invalid file path name (file is not there).
char buffer_2[] = "C:\\TEST\\file.doc";
char *lpStr2;
lpStr2 = buffer_2;
// Return value from "PathFileExists".
int retval; 
// Search for the presence of a file with a true result.
retval = PathFileExists(lpStr1);
if(retval == 1)
{
cout cout cout }
else{
cout cout }
// Search for the presence of a file with a false result.
retval = PathFileExists(lpStr2);
if(retval == 1)
{
cout cout cout }
else{
cout cout }
}

6.使用CFileFind 类....这是一个InternetServices类,在此可以借用一下。也可以用于遍历文件夹(s可指定深度)
BOOL CPubFunc::FileExist(CString FileName)
{
 CFileFind fFind;
 return fFind.FindFile(FileName);
}

//创建目录
 #include
BOOL CreateDirectory(
  LPCTSTR
lpPathName,                         // pointer to directory path string
  LPSECURITY_ATTRIBUTES lpSecurityAttributes  // pointer to security descriptor
);

1. 使用_access函数,函数原型为 int _access( const char *path, int mode );


2. 使用CreateFile函数,函数原型为:

HANDLE CreateFile( LPCTSTR lpFileName, // pointer to name of the file DWORD dwDesiredAccess, // access (read-write) mode DWORD dwShareMode, // share mode LPSECURITY_ATTRIBUTES lpSecurityAttributes, // pointer to security attributes DWORD dwCreationDisposition, // how to create DWORD dwFlagsAndAttributes, // file attributes HANDLE hTemplateFile // handle to file with attributes to // copy );
3. 使用FindFirstFile函数,函数原型为: HANDLE FindFirstFile( LPCTSTR lpFileName, // pointer to name of file to search for LPWIN32_FIND_DATA lpFindFileData // pointer to returned information );
//例子:

BOOL CPubFunc::DirectoryExist(CString Path)
{
 WIN32_FIND_DATA fd;
 BOOL ret = FALSE;
    HANDLE hFind = FindFirstFile(Path, &fd);
    if ((hFind != INVALID_HANDLE_VALUE) && (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
    {  //目录存在
            ret = TRUE;    
    }
   FindClose(hFind);
 return ret;
}
 4. 使用GetFileAttributes函数,函数原型如下: DWORD GetFileAttributes( LPCTSTR lpFileName // pointer to the name of a file or directory );
5. 使用Shell Lightweight Utility APIs函数 PathFileExists()专门判断文件目录时否存在的函数文件名可读性比较强还可以判断目录是否存在 Header: Declared in Shlwapi.h Import Library: Shlwapi.lib 以上的各种方法供参考,函数具体用法需参见MSDN。
//这是MSDN中的例子:
#include
#include
#include "Shlwapi.h"

void main( void )
{
// Valid file path name (file is there).
char buffer_1[] = "C:\\TEST\\file.txt";
char *lpStr1;
lpStr1 = buffer_1;
// Invalid file path name (file is not there).
char buffer_2[] = "C:\\TEST\\file.doc";
char *lpStr2;
lpStr2 = buffer_2;
// Return value from "PathFileExists".
int retval; 
// Search for the presence of a file with a true result.
retval = PathFileExists(lpStr1);
if(retval == 1)
{
cout cout cout }
else{
cout cout }
// Search for the presence of a file with a false result.
retval = PathFileExists(lpStr2);
if(retval == 1)
{
cout cout cout }
else{
cout cout }
}

6.使用CFileFind 类....这是一个InternetServices类,在此可以借用一下。也可以用于遍历文件夹(s可指定深度)
BOOL CPubFunc::FileExist(CString FileName)
{
 CFileFind fFind;
 return fFind.FindFile(FileName);
}

//创建目录
 #include
BOOL CreateDirectory(
  LPCTSTR
lpPathName,                         // pointer to directory path string
  LPSECURITY_ATTRIBUTES lpSecurityAttributes  // pointer to security descriptor
);

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
MySQL String Types: Storage, Performance, and Best PracticesMySQL String Types: Storage, Performance, and Best PracticesMay 10, 2025 am 12:02 AM

MySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,

Understanding MySQL String Types: VARCHAR, TEXT, CHAR, and MoreUnderstanding MySQL String Types: VARCHAR, TEXT, CHAR, and MoreMay 10, 2025 am 12:02 AM

MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

What are the String Data Types in MySQL?What are the String Data Types in MySQL?May 10, 2025 am 12:01 AM

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

How to Grant Permissions to New MySQL UsersHow to Grant Permissions to New MySQL UsersMay 09, 2025 am 12:16 AM

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

How to Add Users in MySQL: A Step-by-Step GuideHow to Add Users in MySQL: A Step-by-Step GuideMay 09, 2025 am 12:14 AM

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

MySQL: Adding a new user with complex permissionsMySQL: Adding a new user with complex permissionsMay 09, 2025 am 12:09 AM

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

MySQL: String Data Types and CollationsMySQL: String Data Types and CollationsMay 09, 2025 am 12:08 AM

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

MySQL: What length should I use for VARCHARs?MySQL: What length should I use for VARCHARs?May 09, 2025 am 12:06 AM

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools