CheckIfFileExist

/* Credits: w2ch Anon */
/* File:CheckIfFileExist.cpp */

#include <windows.h>
#include <stdio.h>


bool DoesFileExist(const char *szpFilePath, const char *szFileName)
{
    WIN32_FIND_DATA ffd;
    char szDir[MAX_PATH];
    HANDLE hFind = INVALID_HANDLE_VALUE;
    DWORD dwRet;


    /* If no file to search for: Return false. */
    if (szFileName == NULL) return false;

    /* Check that the input path plus 3 is not longer than MAX_PATH.
     * Three characters are for the "\*" plus NULL appended below.
     * At the same time prepare string for use with FindFile functions. */
    if (szpFilePath == NULL)
    {
        /* If no szpFilePath, use the directory the file is in */
        dwRet = GetCurrentDirectory((sizeof(szDir) / sizeof(*szDir)) - 3, szDir);

        /* ERROR: GetCurrentDirectory failed, GetLastError() */
        if (dwRet == 0) return 0;
        /* ERROR: Buffer(string) too small; need %d characters\n, */
        if (dwRet > MAX_PATH - 3) return 0;
    }
    else
    {
        for (dwRet = 0; szpFilePath[dwRet] != '\0'; ++dwRet);
        /* ERROR: Buffer(string) too small; need %d characters\n, */
        if (dwRet > MAX_PATH - 3) return 0;
        for (int n = dwRet; n; szDir[n] = szpFilePath[n], --n);
        szDir[0] = szpFilePath[0];
    }

    /* Add "\*" to the directory name. */
    szDir[dwRet]   = '\\';
    szDir[++dwRet] = '*';
    szDir[++dwRet] = '\0';


    /* Find the first file in the directory. */
    hFind = FindFirstFileA(szDir, &ffd);
    if (INVALID_HANDLE_VALUE == hFind) return 0; /* ERROR "FindFirstFile" */

    /* List all the files in the directory with some info about them. */
    do
    {
        /* Only compare to files and not other objects, e.g: directorys */
        if (!(ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
        {
            /* Compare if ffd.cFileName match szFileName and if yes return true */
            for (dwRet = 0; ffd.cFileName[dwRet] == szFileName[dwRet] && szFileName[dwRet]; ++dwRet);
            if (!ffd.cFileName[dwRet])
            {
                FindClose(hFind);
                return true;
            }
        }
    } while (FindNextFile(hFind, &ffd) != 0);

    dwRet = GetLastError();
    if (dwRet != ERROR_NO_MORE_FILES); // ERRPR: "FindFirstFile"

    /* If we return here we did not find the file we were looking for */
    FindClose(hFind);
    return false;
}


/* find if in the current directory there is a file named argv[0] */
int main(int argc, char *argv[])
{
    bool bFileExist;
    if (argc == 2)      bFileExist = DoesFileExist(NULL, argv[1]);
    else if (argc == 3) bFileExist = DoesFileExist(argv[1], argv[2]);
    else
    {
        fprintf(stdout, "Usages:%s [filepath] [file]", argv[0]);
        return 0;
    }

    if (bFileExist)
    {
        fprintf(stdout, "The file exist!");
    }
    else
    {
        fprintf(stdout, "The file dose not exist!");
    }

    return 0;
}