C# Signature:
[DllImport("kernel32.dll")]
static extern uint GetTempPath(uint nBufferLength,
[Out] StringBuilder lpBuffer);
VB Signature:
Declare Function GetTempPath Lib "kernel32.dll" (nBufferLength As Integer, _
<Out> lpBuffer As StringBuilder) As Integer
Notes:
None.
Tips & Tricks:
Note that there are two entrypoints to GetTempPath in kernel32.dll called "GetTempPathA" and "GetTempPathW". So if you want to use GetTempPath you have to set the EntryPoint on the DllImport-Attribute as follows (C#):
[DllImport("kernel32.dll", EntryPoint = "GetTempPathA")]
Please add some more!
Sample Code:
VB Sample
'TempFile.vb
'(DllImport declarations omitted)
Public Class TempFile
Public Const MAX_PATH As Integer = 260
Public Function Create(ByVal astrFoldername As String, _
ByVal astrPrefix As String) As String
Dim tempPath As New StringBuilder(MAX_PATH - 14)
Dim tempName As New StringBuilder(MAX_PATH)
Dim lngRet As Integer
Dim result As String = ""
lngRet = 1
If (astrFoldername = "") Then
lngRet = GetTempPath(MAX_PATH - 14, tempPath)
astrFoldername = tempPath.ToString
End If
If (lngRet > 0 And lngRet <= MAX_PATH - 14) Then
lngRet = GetTempFileName(astrFoldername, astrPrefix, 0, tempName)
If lngRet <> 0 Then
result = tempName.ToString
End If
End If
Return result
End Function
End Class
'This project references Microsoft.VisualStudio.QualityTools.UnitTestFramework
'TempFileTest.vb
Imports System.IO
Imports System.Text
Imports Microsoft.VisualStudio.TestTools.UnitTesting
'''<summary>
'''This is a test class for TempFileTest and is intended
'''to contain all TempFileTest Unit Tests
'''</summary>
<TestClass()> _
Public Class TempFileTest
Private fFoldername As String = "C:\TempFile"
Private fPrefix As String = "Prefix" ' Only first three characters will be used by Windows API
Private testContextInstance As TestContext
'''<summary>
'''Gets or sets the test context which provides
'''information about and functionality for the current test run.
'''</summary>
Public Property TestContext() As TestContext
Get
Return testContextInstance
End Get
Set(ByVal value As TestContext)
testContextInstance = value
End Set
End Property
'''<summary>
'''A test for Create
'''</summary>
<TestMethod()> _
Public Sub CreateTest()
Dim target As TempFile = New TempFile
Dim expected As String = fFoldername + "\" + Left(fPrefix, 3) 'Only part of the expected answer. The other part is random.
Dim actual As String
Dim dirInfo As DirectoryInfo
If Not Directory.Exists(fFoldername) Then
dirInfo = Directory.CreateDirectory(fFoldername)
If Not dirInfo.Exists Then
Throw New Exception("Directory '" + fFoldername + "' can not be created")
End If
End If
actual = target.Create(fFoldername, fPrefix)
Assert.IsTrue(File.Exists(actual))
'Remove file before procedure exits.
File.Delete(actual)
Assert.AreEqual(Left(expected, Len(fFoldername) + 4), Left(actual, Len(fFoldername) + 4))
Dim shortPath As New StringBuilder(TempFile.MAX_PATH)
TempFile.GetShortPathName(Path.GetTempPath, shortPath, TempFile.MAX_PATH)
expected = shortPath.ToString + Left(fPrefix, 3) ' GetTempPath end with "\"
actual = target.Create("", fPrefix)
Assert.IsTrue(File.Exists(actual))
'Remove file before procedure exits.
File.Delete(actual)
Assert.AreEqual(Left(expected, Len(fFoldername) + 4), Left(actual, Len(fFoldername) + 4))
End Sub
End Class
Alternative Managed API:
