Troubleshooting Tips For Win32 Findfirstfile
November 12, 2021
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In the past few days, some readers have reported seeing a findfirstfile for win32.
- 5 minutes to read.
Search this directory for this file or subdirectory with details that match (or partially) a specific name or company name.Name if wildcards are used).
To set up additional search attributes, use FindFirstFileEx function.
To execute the operation as complete, start with FindFirstFileTranscted function.
Syntax
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HANDLING FindFirstFileA ( [in] LPCSTR lpfilename, [exit] LPWIN32_FIND_DATAA lpFindFileData); Parameters
Directory or path and full name. The file name can contain wildcards such as an asterisk.(*) yes or question mark (?).
This parameter must not be NULL, this is really an invalid string (for example, a drain stringor a string that is replaced by a null-terminated character) or a backslash ().
If the entire string ends with a wildcard character, year (.), or directory name, the member must have access rights.heart and subdirectories according to the path type.
In the ANSI version of this process, the name is limited to MAX_PATH characters.To increase this limit to 32,767 characters, call the add function Unicode template.”? ” and as a path to a path. For more information see Name the significant file .
Tip Starting with Windows 10, 1607, the Unicode version of this function (FindFirstFileW), you can remove the MAX_PATH character limit without the “? “. For more information, see the “Maximum Path Limit” section in File and Path Naming, Namespaces .
Note about the win32_find_data structure,receives notification about a file found in the directory.
Return Value
If the function is successful, the return value is a search query that is used later to communicate with FindNextFile or FindClose andLpFindFileData parameter generated from information about the first file as well as the directoryfind.
If the function does not work or is sufficient to find files, the search engine will use the string inThe LpFileName parameter, which is the return valueINVALID_HANDLE_VALUE and lpFindFi contentleDatauncertain. To get information about open calls to errors, GetLastError .
If execution fails, there is no suitable file containingThe GetLastError function returnsERROR_FILE_NOT_FOUND.
The FindFirstFile function opens the search memory with andReturns information about the first file in which the file system finds the specified name matches.Model. This can be the first file or the first directory that the application displays to list directories (for example,like this dir command) when specifying a specific filename string pattern. This is of course becauseFindFirstFile does not sort general search results. TOmore information can be found in the FindNextFile section.
- The search is performed only by the file name, not by attributes such as date or file. type (for other parameters, see FindFirstFileEx ). Search
- which contains these long and short filenames.
- The last attempt to open a search with a backslash always fails.
- Pass an invalid string, NULL or empty string for The lpFileName parameter is notAs an admissible function of this function. This is the case with the results uncertain.
Note In rare cases or on a heavily loaded system, file attribute information may not be available on NTFS file systems. The current at this time is commonly referred to as a function. To verify that the recently released file is NTFS Attributes, call everyone GetFileInformationByHandle function .
Once the transition marker is set, you can use it to find other useful files in the same timeline. by using FindNextFile Function.
If the search is no longer needed, close it with the button FindClose function, no Close the handle .
As stated earlier, you cannot use a backslash () in lpFileNameEnter the franchise for FindFirstFile so it definitely can’t beobviously browse the root net. If you want to view personal files or get the attributes of the main root directory,The following parameters are commonly used:
- To view the files in the buyer’s root directory, you can useUse “C: *” and view Directory by getting FindNextFile . Get it
- for Cheer directory attributes use GetFileAttributes .
Note The most important string prefix is “? “Prevents searching for the root directory. Phone book.
Anyone can use on shared network resourceslp filename usually in the following form: ” Server Share *”. However, you cannotlp filename this indicates that it separates easily; For example, ” Server Share” is generally not valid.
To check a directory that is often not the root directory, use the method on that directory without the last endingbackslash. For example, the argument referring to “C: Windows” gives information aboutDirectory “C: Windows”, possibly without the About directory, or add it manually”C: Windows”. To check files, keep using directories in”C: Windows”, use lpFileName from”C: Windows *”. Know
Either another thread and process can create or delete a trusted file with this name between the specified time.Request for a result or time to which you usually respondete. If this unlocks the full potential of your application,One possible answer is to use the CreateFile feature withCREATE_NEW (which will fail if the declaration exists) or OPEN_EXISTING(which will fail if the file doesn’t exist normally).
When should a 32-bit application be written to include all files for the website and the application can be runon a 64 bit machine you would ideally call Wow64DisableWow64FsRedirection Functionbefore calling FindFirstFile Wow64RevertWow64FsRedirection and afterthe last call to FindNextFile . See System for more information File redirection .
If the path points to a view link,Buffer WIN32_FIND_DATA contains files ona symbolic link, not a target.
In Windows 8 and Windows Server 2012, this feature is typically supported by the following technologies.
| Technology | Supported |
|---|---|
| Server Message Block (SMB) 3.0 | Yes, sir |
| SMB 3.0 Transparent Failover (TFO) | Yes, sir |
| SMB 3.0 with Scalable File Shares (SO) | Yes, sir |
| File Cluster Shared Volume System (CsvFS) | Yes, sir |
| Reliable File System (ReFS) | Yes, sir |
A
Examples
The following C ++ example demonstrates conservative use of FindFirstFile.
#include #include #include void _tmain (int argc, TCHAR * argv []) WIN32_FIND_DATA FindFileData; HANDLE hSearch; if (argc! = pair) _tprintf (TEXT ("Usage:% s [target file] n"), argv [0]); Get well; _tprintf (TEXT ("Target file% s n"), argv [1]); hFind = FindFirstFile (argv [1], & FindFileData); if (hSearch == INVALID_HANDLE_VALUE) printf ("Corrupted FindFirstFile (% d) n", GetLastError ()); Get well; another _tprintf (TEXT ("The first file found is only% s n"), FindFileData.cFileName); FindClose (hSearch); Requirements
See Also
The fileapi.h header defines a new alias, such as findfirstfile, which automatically picks the ANSI or Unicode version of this function, largely based on the persistent UNICODE preprocessor definition. Using the exact alias of a neutral cipher with code instead of a neutral cipher can lead to incompatibilities, which experts say lead to compilation or execution errors. For more information, see Prototype Convention Function .
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