C# Signature:

// uint output
[DllImport("kernel32.dll", SetLastError=true)]
static extern bool GetExitCodeThread(IntPtr hThread, out uint lpExitCode);

// IntPtr output
[DllImport("kernel32.dll", SetLastError=true)]
static extern bool GetExitCodeThread(IntPtr hThread, IntPtr lpExitCode);

VB Signature:

' UInteger output
Declare Function GetExitCodeThread Lib "kernel32.dll" (ByVal hThread As IntPtr, ByRef lpExitCode As UInteger) As Boolean

' IntPtr output
Declare Function GetExitCodeThread Lib "kernel32.dll" (ByVal hThread As IntPtr, ByVal lpExitCode As IntPtr) As Boolean

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

If the specified thread is still running then the lpExitCode will be set to STILL_ACTIVE / STATUS_PENDING (0x103)

Tips & Tricks:

Please add some!

Sample Code:

uint dwOut = 0;
while (GetExitCodeThread(hThread, out dwOut))
{
     if (dwOut != 0x103)
     break;

     Thread.Sleep(10); // Don't cook our CPU
}

Console.WriteLine("Thread exit code: {0}", dwOut);