Thread: FindFirstFile()

What would be the first parameter to this function if I want to find the first file in the directory where my program is? This directory will never be the same. Thanks.

GetModuleFileName will get the complete path and filename to the current module. PathRemoveFileSpec will remove the filename and last trailing backslash. Finally we use PathIsRoot to check if it is a root directory. If it is, we must add "\\*" before passing the path to FindFirstFile.

Code:

#include <shlwapi.h>

TCHAR szPath[MAX_PATH + 10];
GetModuleFileName(NULL, szPath, MAX_PATH);
PathRemoveFileSpec(szPath);
if (PathIsRoot(szPath))
    lstrcat(szPath, TEXT("\\*"));

FindFirstFile(szPath, ...);

Code:

#include <stdio.h>
#include <string.h>
#include "shlwapi.h"
#include <windows.h>

int main()
{
    FILE *out;
    char path[MAX_PATH];

    WIN32_FIND_DATA file;
    HANDLE fhandle;

    GetModuleFileName(NULL, path, MAX_PATH);
    PathRemoveFileSpec(path);

    if(PathIsRoot(path))
        strcat(path, "\\*");

    out = fopen("client_list.txt", "w");
    if(out == NULL){
        printf( "Error creating file\n");
        exit(1);
    }

    fhandle = FindFirstFile(path, &file);
    if(fhandle == INVALID_HANDLE_VALUE){
        printf("Invalid File Handle.\n");
        exit(1);
    } 

    while(FindNextFile(fhandle, &file) != 0){
        if(!file.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
            fprintf(out, "%s\n", file.cFileName);
    }

    fclose(out);

    return 0;
}

Why isn't this compiling?

Errors:
linked list error LNK2019: unresolved external symbol __imp__PathIsRootA@4 referenced in function _main
c:\Documents and Settings\kao\My Documents\Visual Studio Projects\linked list\linked list\linked list.cpp(33): warning C4806: '&' : unsafe operation: no value of type 'bool' promoted to type 'int' can equal the given constant
linked list error LNK2019: unresolved external symbol __imp__PathRemoveFileSpecA@4 referenced in function _main
linked list fatal error LNK1120: 2 unresolved externals

Also, if you have any suggestions about this code, please don't hesitate to post. Thanks

Unresolved external symbol errors typically mean that you have to link with the correct library. Down the bottom of the documentation page for a Windows function is the library you need to link to. In this case it is shlwapi.lib. In MSVC, you can link to a library using a pragma (usually placed just below the includes):

Code:

#pragma comment(lib, "shlwapi.lib")

The other error relates to this line:

Code:

if(!file.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)

which should be:

Code:

if (!(file.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))

Code:

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

int main()
{
	FILE *out;
	char path[MAX_PATH];

	WIN32_FIND_DATA file;
	HANDLE fhandle;
	DWORD error;

	error = GetCurrentDirectory(MAX_PATH, path);
	if(error == 0){
		printf( "Error\n");
		exit(1);
	}

	SetCurrentDirectory(path);

	out = fopen("client_list.txt", "w");
	if(out == NULL){
		printf( "Error creating file\n");
		exit(1);
	}

	fhandle = FindFirstFile(path, &file);
	if(fhandle == INVALID_HANDLE_VALUE){
		printf("Invalid File Handle.\n");
		exit(1);
	} 

	while(FindNextFile(fhandle, &file) != 0){
		if(!(file.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
			fprintf(out, "%s\n", file.cFileName);
	}

	fclose(out);

	return 0;
}

This compiles but nothing gets written to the text file (there are files in the directory). What's the reason? Thanks.