|
|
|
How do I call functions in a DLL not in the default search path?
Written: 6/23/2002 Updated: 6/23/2002
You can load the DLL manually before the CLR tries to do it for you, using the LoadLibrary
Win32 API. By passing it the fully qualified path, you can bypass the regular search path rules.
The following code calls the exported function MyFunc in unmanaged.dll, located in the
..\unmanaged directory relative to the executable.
| C# |
[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
static extern IntPtr LoadLibrary(string lpFileName);
[DllImport("unmanaged.dll")]
static extern int MyFunc(int i);
static void Main()
{
// Ensure current directory is exe directory
Environment.CurrentDirectory = Path.GetDirectoryName( Assembly.GetExecutingAssembly().Location );
string dllPath = Path.GetFullPath( @"..\unmanaged\unmanaged.dll" );
LoadLibrary( dllPath );
Console.WriteLine( MyFunc( 5 ) );
}
|
| VB.NET |
Declare Auto Function LoadLibrary Lib "kernel32.dll" (ByVal lpFileName As String) As IntPtr
Declare Function MyFunc Lib "unmanaged.dll" (ByVal i As Integer) As Integer
Shared Sub Main()
' Ensure current directory is exe directory
Environment.CurrentDirectory = Path.GetDirectoryName([Assembly].GetExecutingAssembly().Location)
Dim dllPath As String = Path.GetFullPath("..\unmanaged\unmanaged.dll")
LoadLibrary(dllPath)
Console.WriteLine(MyFunc(5))
End Sub
|
|
