Question

prgchDirPath是char指针。但预计是LPCWSTR。如何改变这个？

prgchDirPath是一个目录路径。 文件不存在。但我想确定目录/路径是否存在。以下API可以帮助我吗？如果有，怎么样？

unsigned char IsFilePathCorrect(char* prgchDirPath)
{
        WIN32_FIND_DATA FindFileData;
        HANDLE handle;
        int found=0;

        //1. prgchDirPath is char pointer. But expected is LPCWSTR.
        //How to change this?
        //2. prgchDirPath is a directory path. File is not existed.
        //But I want to make sure if directory/path exists or not.
        //Can the API below helps me? if yes, how?
        handle = FindFirstFile(prgchDirPath, &FindFileData);
        if(handle != INVALID_HANDLE_VALUE)
        found = 1;
        if(found) 
        {
            FindClose(handle);
        }
        return found;
}

我想检查目录路径是否存在。请提供一个示例代码。谢谢。

Answer 1

您可以简单地使用access，它在Windows，Linux，Mac等广泛支持：access(filepath, 0)如果文件存在则返回0，否则返回错误代码。在Windows上，您需要#include <io.h>。

Answer 2

如何使用getAttributes函数执行此操作： -

BOOL DirectoryExists(LPCTSTR szPath)
{
  DWORD dwAttrib = GetFileAttributes(szPath);

  return (dwAttrib != INVALID_FILE_ATTRIBUTES && 
         (dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
}

或者您也可以尝试： -

#include <io.h>     // For access().
#include <sys/types.h>  // For stat().
#include <sys/stat.h>   // For stat().

bool DirectoryExists( const char* path){

    if( _access( path, 0 ) == 0 ){

        struct stat s;
        stat( path, &s);

        return (s.st_mode & S_IFDIR) != 0;
    }
    return false;
}

Answer 3

如果不使用任何Windows API，您可以检查路径是否正确，如下所示

    /*
     * Assuming that prgchDirPath is path to a directory
     * and not to any file.
     */
    unsigned char IsFilePathCorrect(char* prgchDirPath)
    {
        FILE *fp;
        char path[MAX_PATH] = {0};

        strcpy(path, prgchDirPath);
        strcat(path, "/test.txt");

        fp = fopen(path, "w");
        if (fp == NULL)
            return 0;

        fclose(fp);
        return 1;
    }

Answer 4

#include<stdio.h>
#include<fcntl.h>

#define DEVICE "test.txt"

int main()
{
    int value = 0;
    if(access(DEVICE, F_OK) == -1) {
        printf("file %s not present\n",DEVICE);
        return 0;
    }
    else
        printf("file %s present, will be used\n",DEVICE);
    return 0;
}

检查c中是否存在文件

4 个答案: