.NET StillImage, RegisterLaunchApplication

Question

I am trying to register my application for scanner's scanning action. Following code should do that:

public class Class1
{
    [ComImport]
    [Guid("641BD880-2DC8-11D0-90EA-00AA0060F86C")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IStillImage
    {
        [PreserveSig]
        int RegisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)] string pwszAppName, [In, MarshalAs(UnmanagedType.LPWStr)] string pwszCommandLine);
    }

    [DllImport("kernel32.dll")]
    static extern IntPtr GetModuleHandle(
    [MarshalAs(UnmanagedType.LPWStr)] string lpModuleName);

    [DllImport("sti.dll", EntryPoint = "StiCreateInstanceW")]
    static extern int StiCreateInstance(IntPtr hinst, int dwVer, out IStillImage ppSti, IntPtr punkOuter);

    const int STI_VERSION_3 = 0x01000003;

    public static void DoStaff()
    {
        IntPtr hinst = GetModuleHandle(null);
        IStillImage sti;
        int ret = StiCreateInstance(hinst, STI_VERSION_3, out sti, IntPtr.Zero);
        ret = sti.RegisterLaunchApplication("SuperTruperApp", @"c:\Windows\notepad.exe");
    }

}

But after running this code I am always getting error -2147024809 => 0x80070057 which should stand for wrong argument.

I found same issue on http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.interop/2008-04/msg00123.html does any one have working solution?

Next question will be about successful unregister :-)

Thanks a lot

Answer 1

I made a great progress on this topic. I copied STI interface implementation from EverNote source code and this solution was working as well.

namespace StiWorks
{
//COPY OF https://github.com/ryanmcdonnell/ScanToEvernote/blob/c8fd7dfed041950499afe7578700199461a37c65/ScanToEvernote/Sti.cs


public enum STI_DEVICE_TYPE : int
{
    StiDeviceTypeDefault = 0,
    StiDeviceTypeScanner = 1,
    StiDeviceTypeDigitalCamera = 2,
    StiDeviceTypeStreamingVideo = 3
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct STI_DEV_CAPS
{
    public int dwGeneric;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct STI_DEVICE_INFORMATIONW
{
    private const int STI_MAX_INTERNAL_NAME_LENGTH = 128;

    public int dwSize;

    public STI_DEVICE_TYPE DeviceType;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = STI_MAX_INTERNAL_NAME_LENGTH)]

    string szDeviceInternalName;

    public STI_DEV_CAPS DeviceCapabilities;

    public int dwHardwareConfiguration;

    [MarshalAs(UnmanagedType.LPWStr)]

    public string pszVendorDescription;

    [MarshalAs(UnmanagedType.LPWStr)]

    public string pszDeviceDescription;

    [MarshalAs(UnmanagedType.LPWStr)]

    public string pszPortName;

    [MarshalAs(UnmanagedType.LPWStr)]

    public string pszPropProvider;

    [MarshalAs(UnmanagedType.LPWStr)]

    public string pszLocalName;

}

[Guid("641BD880-2DC8-11D0-90EA-00AA0060F86C"), // IStillImageW
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IStillImage // cannot list any base interfaces here
{
    // note that IUnknown Interface members are NOT listed here
    void Initialize(IntPtr hinst, [In] int dwVersion);

    void GetDeviceList([In] int dwType, [In] int dwFlags, [Out] out int pdwItemsReturned, [In, Out] IntPtr ppBuffer);

    void GetDeviceInfo([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName, [In, Out] IntPtr ppBuffer);

    void CreateDevice([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName, [In] int dwMode, [In, Out] IntPtr pDevice, [In, Out] IntPtr punkOuter);

    void GetDeviceValue([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName, [In, MarshalAs(UnmanagedType.LPWStr)] string pValueName, [In, Out] ref int pType, [In, Out] StringBuilder pData, [In, Out] ref int cbData);

    void SetDeviceValue([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName, [In, MarshalAs(UnmanagedType.LPWStr)] string pValueName, [In] int Type, [In, Out] IntPtr pData, [In] int cbData);

    void GetSTILaunchInformation([In, Out, MarshalAs(UnmanagedType.LPWStr)] ref string pwszDeviceName, [In, Out] ref int pdwEventCode, [In, Out, MarshalAs(UnmanagedType.LPWStr)] ref string pwszEventName);

    void RegisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)] string pwszAppName, [In, MarshalAs(UnmanagedType.LPWStr)] string pwszCommandLine);

    void UnregisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)] string pwszAppName);

    void EnableHwNotifications([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName, [In] bool bNewState);

    void GetHwNotificationState([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName, [In, Out] ref bool pbCurrentState);

    void RefreshDeviceBus([In, MarshalAs(UnmanagedType.LPWStr)] string pwszDeviceName);

    void LaunchApplicationForDevice([In, MarshalAs(UnmanagedType.LPWStr)]
            string pwszDeviceName, [In, MarshalAs(UnmanagedType.LPWStr)] string
            pwszAppName, [In, Out] IntPtr pStiNofify);

    void SetupDeviceParameters([In, Out] ref STI_DEVICE_INFORMATIONW pDeviceInfo);

    void WriteToErrorLog([In] int dwMessageType, [In, MarshalAs(UnmanagedType.LPWStr)] string pszMessage);
}

[ComImport, Guid("B323F8E0-2E68-11D0-90EA-00AA0060F86C")]
public class Sti
{

}

and usage in code for application registration

        Sti sti = new Sti();
        IStillImage stillImage = (IStillImage) sti;
        stillImage.RegisterLaunchApplication("MY_ID_I_WANT_TO_BE_IN_REGISTRY", "C:\ApplicationToRegister.exe");

usage in code for application unregistration

        Sti sti = new Sti();
        IStillImage stillImage = (IStillImage) sti;
        stillImage.UnregisterLaunchApplication("MY_ID_I_WANT_TO_BE_IN_REGISTRY");

Answer 2

You missed some methods in your interface and as result you called Initialize method instead of RegisterLaunchApplication method. Please, try use next interface (all methods except RegisterLaunchApplication and UnregisterLaunchApplication are stubs):

[ComImport]
[Guid("641BD880-2DC8-11D0-90EA-00AA0060F86C")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IStillImage
{
    int Initialize();

    int GetDeviceList();

    int GetDeviceInfo();

    int CreateDevice();

    int GetDeviceValue();

    int SetDeviceValue();

    int GetSTILaunchInformation();

    [PreserveSig]
    int RegisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)] string pwszAppName, [In, MarshalAs(UnmanagedType.LPWStr)] string pwszCommandLine);

    [PreserveSig]
    int UnregisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)] string pwszAppName);
}