LInet::SendShowWinCmd

#include " ltwrappr.h "

L_INT LInet::SendShowWinCmd (plRemoteComp, uCommandID, uWindowID, nCmdShow)

LInet * plRemoteComp;	/* instance of a remote computer */
L_UINT uCommandID;	/* command id */
LONG_PTR uWindowID;	/* window id */
L_INT nCmdShow;	/* show flag */

Sends a show window command to a remote computer.

Parameter	Description
plRemoteComp	Instance of the remote computer to which the command will be sent.
uCommandID	Command ID. Each command sent by a member of a connection should have a unique ID. Since a member of a connection may send several commands, this ID allows that member to identify when a specific command request has been completed.
uWindowID	The id of the window to show.
nCmdShow	Specifies how the window is to be shown. The possible values are the same as the nCmdShow parameter of the ShowWindow command from the Windows SDK.

Returns

SUCCESS	This function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

The remote computer should respond by calling LInet::SendShowWinRsp in its LInet::CommandCallBack function.

The LInet::CommandCallBackfunction will receive the uWindowID and the nCmdShow information in the pParams parameter. The uWindowID information will be in pParams[0] and the nCmdShow information will be in pParams[1].

To process responses to commands, a class must be derived from LInet and the LInet::ResponseCallBackmember function must be overridden.

Required DLLs and Libraries

LTNET

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LInet::SendShowWinRsp, LInet::ResponseCallBack, LInet::CommandCallBack, Class Members
Topics:	Sending Commands and Responses
	A Client Server Diagram: Sending Commands and Responses

Example

//This example sends a message to a remote connection to create a window.
//It is assumed that:
//1.  the network as been started (LInet::StartUp()) 
//2.  a connection has been established with a remote server (LInet::m_Inet.Connect())
class LUserNet7 : public LInet
{
public:
   L_INT  OnConnect(LInet *plConnection, L_INT nError)
   {
      L_INT   nRet = SUCCESS;
      L_CHAR  *pszHostName;
      L_TCHAR strMsg[L_MAXPATH];
      
      if(nError != SUCCESS)
      {
         wsprintf(strMsg, _T("Error[%d]: OnConnect"), nRet);
         MessageBox(NULL, strMsg, 0 , 0);
         return nError;
      }
      
      // Get the remote computer name   
      if ((pszHostName = plConnection->GetHostName(HOST_NAME_IP)) == NULL)      
         return FAILURE;   
      wsprintf(strMsg, _T("OnConnect: Connected to %hs"), (LPTSTR)pszHostName);
      MessageBox(0, strMsg, 0, 0);
      this->SendLoadCmd(plConnection, CMD_LOAD, TEXT("E:\\Program Files\\LEAD Technologies\\LEADTOOLS 16\\Images\\IMAGE1.CMP"));
      return nRet;
   }
   L_INT CommandCallBack (LInet * plConnection,
                          CMDTYPE     uCommand,
                          L_UINT      uCommandID,
                          L_INT       nError,
                          L_UINT      uParams, 
                          pPARAMETER  pParams, 
                          L_UINT      uExtra,
                          L_CHAR*pExtra);
};
LUserNet7 m_ClientInet;
L_INT LInet__SendShowWinCmdExample(LInet * pInetRemoteServer, L_UINT uWindowID)
{
   L_INT nRet = SUCCESS;
   nRet = m_ClientInet.SendShowWinCmd(
      pInetRemoteServer,
      0,
      uWindowID, 
      SW_SHOWMAXIMIZED);
   if(nRet != SUCCESS && nRet != ERROR_DATA_QUEUED)
      return nRet;
   return SUCCESS;
}
//The CommandCallBack() is processed on the server
//To process the commands sent to the computer, you must:
//1. Derive a class from LInet
//2. Override the CommandCallBack member function
L_INT LUserNet7::CommandCallBack (LInet * plConnection,
                              CMDTYPE     uCommand,
                              L_UINT      uCommandID,
                              L_INT       nError,
                              L_UINT      uParams, 
                              pPARAMETER  pParams, 
                              L_UINT      uExtra,
                              L_CHAR*pExtra)
{
   UNREFERENCED_PARAMETER(pExtra);
   UNREFERENCED_PARAMETER(uExtra);
   UNREFERENCED_PARAMETER(uParams);
   UNREFERENCED_PARAMETER(pParams);
   UNREFERENCED_PARAMETER(uCommandID);
   UNREFERENCED_PARAMETER(plConnection);
   L_INT nStatus = ERROR_FEATURE_NOT_SUPPORTED;
   if(nError != SUCCESS)
      nStatus = ERROR_TRANSFER_ABORTED;
   else
   {
      switch(uCommand)
      {
      case CMD_SHOW_WIN:
         {
            L_INT  nStatus = SUCCESS;
            L_INT  nRet;
            HWND   uWindowID = (HWND)(INT_PTR)(pParams[0].uiValue);
            L_INT  nCmdShow  = pParams[1].iValue;
            if (IsWindow((HWND)(INT_PTR)uWindowID))
            {
               nRet = ::ShowWindow(::GetParent((HWND)uWindowID), nCmdShow);
               if (nRet == 0)
                  nStatus = FAILURE;
            }
         }
         break;
         default: 
         {
            return nStatus; 
         }
      }
   }
   return nStatus;
}