Check if a DLL is present in the system

Question

Hi, quick question. I want to find out if a DLL is present in the system where my application is executing.

Is this possible in C#? (in a way that would work on ALL Windows OS?)

For DLL i mean a non-.NET classic dll (a Win32 dll)

(Basically I want to make a check cause I'm using a DLL that may or may not be present on the user system, but I don't want the app to crash without warning when this is not present :P)

Answer 1

Call LoadLibrary.

http://msdn.microsoft.com/en-us/library/ms684175(VS.85).aspx

Answer 2

I'm assuming this is a PInvoke call?

If so the easiest way to make this determine if it's present is to make the call and catch the exception that results if the file does not exist.

[DllImport("some.dll")]
private static void SomeMethod();

public static void SomeMethodWrapper() {
  try {
    SomeMethod();
  } catch (FileNotFoundException) {
    // Do Nothing 
  }
}

Answer 3

Call the LoadLibrary API function:

[DllImport("kernel32", SetLastError=true)]
static extern IntPtr LoadLibrary(string lpFileName);

static bool CheckLibrary(string fileName) {
    return LoadLibrary(fileName) == IntPtr.Zero;
}