USB Connection

USB Connection

• Konstantin Kosinsky

  hey man,

  try this article out. Theres C# Code to download with it too. Should really help

  http://weblogs.asp.net/israelio/archive/2005/08/15/422637.aspx

  
  
  

• Nirbho

  The problem was, this is a Blackberry which I'm trying to connect to, they provided a sample code which in C++ and I was trying to run from C#...When you open the connection you have to pass some events of the device, which is defined as HANDLE in C++ and I found no way, to convert that in C#...So i thought is a good idea, to maybe write something myself which can talk...and have no clue how USB communication works...any suggestions or some sample code highly appreciated.......

  If you want I can provide with that C++ sample code, if you have any idea how we can use HANDLE in C#....

  Thanks,

  Harsimrat

  
  

• gunn

  does the devide get a Drive Letter assigned to it

  It should, and you can use System.IO Namespace to traverse the directory and get the directory and file structure.

  HTH

  
  
  

• Dwain Douglas

  I have a different post, where i posted this.....
  

• Dan Clash

  Really Appreciate,

  Its nothing Blackberry specific it is just talking to USB.....Do you have any idea how we can change this piece of code to C#, will solve lot of my issues......

  I have a device which connects using USB and had the sample code which in C++, I thought is a good idea to move it to C#. You have already helped me in calling the COM function from C#.

  When I try to open the channel, using

  _channel = d.OpenChannel(Channel, eve);

  where IChannel _channel;

  string Channel = "Client";

  The only problem here is (eve) which is events...i.e IChannelEvents eve; and when I do that it is null....

  But in the C Code....it does something like this....

  enum { READ_EVENT, CLOSE_EVENT, NUM_EVENTS };

  then in the int run() // something along these lines......

  {

  //create some events for listening for notifications from the device

  _events[READ_EVENT] = CreateEvent(NULL, FALSE, FALSE, NULL); //unnamed

  _events[CLOSE_EVENT] = CreateEvent(NULL, TRUE, FALSE, NULL); //unnamed

  if( _events[READ_EVENT] == INVALID_HANDLE_VALUE || _events[CLOSE_EVENT] == INVALID_HANDLE_VALUE ) {

  return false;

  }

  private :

  ULONG _refcount;

  HANDLE _events[NUM_EVENTS];

  ublic:

  //implementation of the IChannelEvents interface

  virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid, void **ppvObject )

  {

  if ( riid == IID_IChannelEvents || riid == IID_IUnknown) {

  *ppvObject = (IChannelEvents*)this;

  AddRef();

  return 0;

  }

  return E_NOINTERFACE;

  }

  virtual ULONG STDMETHODCALLTYPE AddRef()

  {

  return ++_refcount;

  }

  virtual ULONG STDMETHODCALLTYPE Release()

  {

  ULONG count = --_refcount;

  if ( count == 0 )

  {

  delete this;

  }

  return count;

  }

  .........................................................

  Now all the question starts is how can I incorporate this HANDLE into my IChannelEvents, so that its not null.....thats is the reason its throwing me exceptions..........

  If I can convert this piece of code to C# will solve my problems...

  Do you have any idea.....

  
  

• AMasson

  This link is about how to PUSH Html to a blackberry, but it's all i could find about C# and blackberry's. Unfortunately i know nothing about Blackberry's so i can't help, but maybe this project has a class library that allows access to a blackberry or some useful code in it you can look at.

  http://www.codeproject.com/cs/webservices/MdsBlackberryPush.asp

  HTH,

  
  
  
• USB Connection