Scan button on scanner button panel

[loki_dre]

Hello,
I am using the Canon P-150.
I am trying to make the ‘scan button’ on the scanner’s button panel run a program when it is pushed. I have heard this can be done with the function RegisterLaunchApplication from the STI (Still Image) API. Anyone have some experience with doing this.

the code I have right now is listed below, however I keep getting an error (0x80070057) when I execute the function ‘RegisterLaunchApplication’:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Reflection;

using System.Management;

using System.Management.Instrumentation;



private void button1_Click(object sender, EventArgs e)

{

IntPtr hinst = GetModuleHandle(null);

IStillImage sti;

int ret = StiCreateInstance(hinst, STI_VERSION_3, out sti, IntPtr.Zero);

string commandline = """ + Assembly.GetEntryAssembly().Location + "" /StiDevice:%1 /StiEvent:%2";

MessageBox.Show(commandline);

ret = sti.RegisterLaunchApplication("MyApp", commandline);

MessageBox.Show(ret.ToString());

}





[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 = 0x01000002;

const int STI_VERSION_3 = 0x01000003;

[dpenney]

@loki_dre wrote:

…I keep getting an error (0x80070057) when I execute the function ‘RegisterLaunchApplication’

According to winerror.h: 0x80070057 = E_INVALIDARG = “One or more arguments are invalid”

I bet the second parameter is required to be a full path to an EXE file (e.g. C:windowsnotepad.exe).
–

[loki_dre]

I believe the code has the full path for the 2nd argument, but correct me if I am wrong

[dpenney]

@loki_dre wrote:

I believe the code has the full path for the 2nd argument, but correct me if I am wrong

What exactly does commandline contain before the call to RegisterLaunchApplication?

As an experiment try:

  ret = sti.RegisterLaunchApplication("MyApp", "C:\windows\notepad.exe");

in place of:

  ret = sti.RegisterLaunchApplication("MyApp", commandline); 

If that works, your second argument is invalid for some reason.
–

[Author]

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