C# Signature:
[DllImport("kernel32.dll")]
static extern uint GetTempFileName(string lpPathName, string lpPrefixString,
uint uUnique, [Out] StringBuilder lpTempFileName);
User-Defined Types:
None.
Notes:
None.
Tips & Tricks:
/// <summary>
/// The GetTempFileName and GetTempFolderName methods (and overloads) provide
/// the same level of convenience as the managed Path.GetTempFileName (including
/// support for folders), but provide access to the Win32 functionality of providing
/// an optional prefix, unique suffix and base folder name, as well as the Win32
/// functionality of creating the temp file or folder as soon as the name is generated.
/// </summary>
class Win32Utility {
[DllImport("kernel32.dll", SetLastError = true)]
static extern uint GetTempFileName(string lpPathName, string lpPrefixString, uint uUnique, [Out] StringBuilder lpTempFileName);
public static string GetTempFileName() {
return GetTempFileName("tmp");
}
public static string GetTempFileName(string prefix) {
return GetTempFileName(prefix, 0);
}
public static string GetTempFileName(string prefix, uint unique) {
return GetTempFileName(prefix, unique, Path.GetTempPath());
}
public static string GetTempFileName(string prefix, uint unique, string basePath) {
StringBuilder sb = new StringBuilder();
uint result = GetTempFileName(basePath, prefix, unique, sb);
if( result == 0 ) {
throw new Exception("Win32 Error: " + System.Runtime.InteropServices.Marshal.GetLastWin32Error());
}
return sb.ToString();
}
public static string GetTempFolderName() {
return GetTempFolderName("tmp");
}
public static string GetTempFolderName(string prefix) {
return GetTempFolderName(prefix, 0);
}
public static string GetTempFolderName(string prefix, uint unique) {
return GetTempFolderName(prefix, unique, Path.GetTempPath());
}
public static string GetTempFolderName(string prefix, uint unique, string basePath) {
string tempFolderName = GetTempFileName(prefix, unique, basePath);
if( unique == 0 ) {
// Delete created file and create folder name instead
File.Delete(tempFolderName);
Directory.CreateDirectory(tempFolderName);
}
return tempFolderName;
}
}
Sample Code:
string tempFile = Win32Utility.GetTempFileName();
...
File.Delete(tempFile);
string tempFolder = Win32Utility.GetTempFolderName();
...
Folder.Delete(tempFolder);
Alternative Managed API:
System.IO.Path
[Visual Basic]
Public Shared Function GetTempFileName() As String
[C#]
public static string GetTempFileName();
[C++]
public: static String* GetTempFileName();
public static function GetTempFileName() : String;
Credits
Tips & Tricks: Chris Sells (csells@sellsbrothers.com)
Sample Code: Chris Sells (csells@sellsbrothers.com)
