private void Dispose(bool disposing)
{
if (!disposed)
{
CloseSourceManager();
if (disposing)
{
if (hModule != null)
{
hModule.Dispose();
hModule = null;
}
}
if (twEvent.pEvent != IntPtr.Zero)
{
Marshal.FreeHGlobal(twEvent.pEvent);
twEvent.pEvent = IntPtr.Zero;
}
}
}
private bool LoadSourceManager()
{
if (state >= TwainState.SourceManagerLoaded)
{
return(true);
}
if (!string.IsNullOrEmpty(WindowsDirectory))
{
string path = Path.Combine(WindowsDirectory, TwainDllName);
if (File.Exists(path))
{
this.hModule = UnsafeNativeMethods.LoadLibraryW(path);
if (!hModule.IsInvalid)
{
IntPtr entry = UnsafeNativeMethods.GetProcAddress(hModule, TwainEntryPoint);
if (entry != IntPtr.Zero)
{
twainEvent = (TwainDelegates.TwainEvent)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwainEvent));
twainIdentity = (TwainDelegates.TwainIdentity)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwainIdentity));
twainParent = (TwainDelegates.TwianParent)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwianParent));
twainUI = (TwainDelegates.TwainUI)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwainUI));
twainCapability = (TwainDelegates.TwainCapability)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwainCapability));
twainNativeTransfer = (TwainDelegates.TwianNativeTransfer)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwianNativeTransfer));
twainPendingXfers = (TwainDelegates.TwianPendingXfer)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwianPendingXfer));
twainStatus = (TwainDelegates.TwainStatus)Marshal.GetDelegateForFunctionPointer(entry, typeof(TwainDelegates.TwainStatus));
this.state = TwainState.SourceManagerLoaded;
return(true);
}
}
}
}
return(false);
}
internal static extern IntPtr GetProcAddress([In()] SafeLibraryHandle hModule, [In(), MarshalAs(UnmanagedType.LPStr)] string lpProcName);