Q. How can I use the API under Mac OS X with XCode and Objective-C?

A. The way to combine C++ and Objective-C is to have the extension on your source file be ".mm" for Objective-C++. With that you can combine C++ and Objective-C code together and make calls to the UPDD API from within an Objective-C method.

Q. What is the simplest way to programmatically check if the touch controller is connected using your API

DWORD iProduct=-1;

      TBApiGetIProduct(device,&iProduct);

      if(iProduct == -1)

      {

        // not connected

      }

else

{

        // connected

Q. I have a number of devices configured in UPDD. My application needs to determine which is the first enabled device. How do I do this in C++?

A. The following code will do just that:-

int aDeviceId; unsigned long lEnabled= 0;

for (int i=0;;i++)

{

          if ((aDeviceId = TBApiGetRelativeDevice(i)) != 0)

          {

                   if   (TBApiGetSettingDWORD(aDeviceId,_T("Enabled"), &lEnabled))

                             if (lEnabled) break;

           }

          else

          {

                   break;

          }

}

Q. I need my device to be disabled on startup. When my application runs, it needs to enable the device. How do I achieve this?

A. The device can be disabled on startup by setting the tbupdd.ini setting InitialMousePortEnabled in [UPDD] to zero. Your application should call TBApiMousePortInterfaceEnable to enable the device.

Q. How can I determine if the touch device is currently enabled?

A. In C++

// To determine if the first  device is enabled

DWORD bEnabled ;

TBApiGetSettingDWORD(TBApiGetRelativeDevice(0),_T("Enabled"),&bEnabled);

// To enable the first device

TBApiSetSettingDWORD(TBApiGetRelativeDevice(0),_T("Enabled"),1);

TBApiApply();

// To disable the first device

TBApiSetSettingDWORD(TBApiGetRelativeDevice(0),_T("Enabled"),0);

TBApiApply(); 

Q. Does your API work with C# and if so, how

A.   The following example demonstrates how to call a (C++) DLL from C Sharp, in this case a function (func_dll) in a DLL called MinGW_dll

using System.Runtime.InteropServices;

using System;

class call_dll {

  [StructLayout(LayoutKind.Sequential, Pack=1)]

  private struct STRUCT_DLL {

    public Int32  count_int;

    public IntPtr ints;

  }

  [DllImport("mingw_dll.dll")]

  private static extern int func_dll(

      int an_int,

      [MarshalAs(UnmanagedType.LPArray)] byte[] string_filled_in_dll,

      ref STRUCT_DLL s

   );

  public static void Main() {

    byte[] string_filled_in_dll = new byte[21];

    STRUCT_DLL struct_dll = new STRUCT_DLL();

    struct_dll.count_int = 5;

    int[]  ia = new int[5];

    ia[0] = 2; ia[1] = 3; ia[2] = 5; ia[3] = 8; ia[4] = 13;

    GCHandle gch    = GCHandle.Alloc(ia);

    struct_dll.ints = Marshal.UnsafeAddrOfPinnedArrayElement(ia, 0);

    int ret=func_dll(5,string_filled_in_dll, ref struct_dll);

    Console.WriteLine("Return Value: " + ret);

    Console.WriteLine("String filled in DLL: " + System.Text.Encoding.ASCII.GetString(string_filled_in_dll));

  }

}

Good article is also available here:

http://www.codeproject.com/KB/cs/C_DLL_with_Csharp.aspx