linkink erro Topic is solved

[marcelovvm]

Dear friends,

I'm triyng to do socket server follow the example at the wxWidgets book (code bellow), but when I build the app same errors are show. I'm using VS2005 + PSDK + wxWidgets 2.6.3

main.h

Code: Select all

#ifndef INCLUDED_SOCKETAPP_H
#define INCLUDED_SOCKETAPP_H
 
class MyFrame: public wxFrame 
{ 
public:

	MyFrame( const wxString& title );

	void OnServerStart( wxCommandEvent& event );

	void OnServerEvent(wxSocketEvent& event );

	void OnSocketEvent(wxSocketEvent& event);

	wxSocketServer* m_server;

	DECLARE_EVENT_TABLE()
};

class MyApp: public wxApp 
{ 
	bool OnInit();
}; 

#endif

main.cpp

Code: Select all

#include "wx/wx.h"
#include "wx/socket.h"
#include "main.h"

enum 
{ 
	SERVER_START = 100,
	SERVER_STOP,
	SERVER_ID,
	SOCKET_ID
};

BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(SERVER_START, MyFrame::OnServerStart)
    EVT_SOCKET(SERVER_ID,  MyFrame::OnServerEvent)
    EVT_SOCKET(SOCKET_ID,  MyFrame::OnSocketEvent)
END_EVENT_TABLE()

MyFrame::MyFrame ( const wxString& title ): wxFrame(NULL, wxID_ANY, title)
{ 
	// Criando a barra de menus - menuBar
	wxMenuBar *menuBar = new wxMenuBar;

	// Criando o primeiro item de menu - menuFile
	wxMenu *menuServer = new wxMenu;
	menuBar->Append( menuServer , "&Server" );
	menuServer->Append( SERVER_START , "&Start" , "Start Server" );
	menuServer->Append( SERVER_STOP , "&Stop" , "Stop Server" );
	//menuServer->Append( wxID_SAVE , "&Save...\tCtrl+S" , "Open account" );
	//menuServer->Append( wxID_CLOSE , "&Close\tCtrl+F4" , "Close this account" );
	
	// Anexando o menuBar criado ao MenuBar do frame
	SetMenuBar( menuBar );
}

void MyFrame::OnServerStart(wxCommandEvent& WXUNUSED(event))
{
    // Create the address - defaults to localhost:0 initially
    wxIPV4address addr;
    addr.Service(3000);

    // Create the socket. We maintain a class pointer so we can
    // shut it down
	
	m_server = new wxSocketServer(addr);

    // We use Ok() here to see if the server is really listening
    if (! m_server->Ok())
    {
        return;
    }

    // Set up the event handler and subscribe to connection events
    m_server->SetEventHandler(*this, SERVER_ID);
    m_server->SetNotify(wxSOCKET_CONNECTION_FLAG);
    m_server->Notify(true);
}

void MyFrame::OnServerEvent(wxSocketEvent& WXUNUSED(event))
{
    // Accept the new connection and get the socket pointer
    wxSocketBase* sock = m_server->Accept(false);

    // Tell the new socket how and where to process its events
    sock->SetEventHandler(*this, SOCKET_ID);
    sock->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
    sock->Notify(true);
}

void MyFrame::OnSocketEvent(wxSocketEvent& event)
{
    wxSocketBase *sock = event.GetSocket();

    // Process the event
    switch(event.GetSocketEvent())
    {
        case wxSOCKET_INPUT:
        {
            char buf[10];

            // Read the data
            sock->Read(buf, sizeof(buf));

            // Write it back
            sock->Write(buf, sizeof(buf));

            // We are done with the socket, destroy it
            sock->Destroy();

            break;
        }
        case wxSOCKET_LOST:
        {
            sock->Destroy();
            break;
        }
    }
}


bool MyApp::OnInit()
{
	MyFrame *frame = new MyFrame( "Socket Application" );
	frame->CreateStatusBar();
	frame->SetStatusText("Socket");
	frame->Show(TRUE);
	SetTopWindow(frame);
	return true;
}

Debug error (using static lib)

------ Build started: Project: socket, Configuration: Debug Win32 ------
Compiling...
main.cpp
Linking...
wxbase26d_net.lib(sckaddr.obj) : error LNK2019: unresolved external symbol "public: void __thiscall wxStringData::Free(void)" (?Free@wxStringData@@QAEXXZ) referenced in function "public: void __thiscall wxStringData::Unlock(void)" (?Unlock@wxStringData@@QAEXXZ)
MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
Debug/socket.exe : fatal error LNK1120: 2 unresolved externals
Build log was saved at "file://c:\Documents and Settings\Marcelo Magalh

[lowjoel]

in your source file you need to do IMPLEMENT_APP(MyApp) to let wxWidgets know your app entry point.

-Joel

[micros]

The StringData:: unresolved externals are most likely caused by using different CRT libraries. Make sure you link against the same C runtime when building wxWidgets and your app (Project Properties -> C/C++ -> Code Generation -> Runtime Library (hope the location didn't change in VS2005)).

[marcelovvm]

Dear micros,

I cheked the Runtime Library and it is configured for DLL exactaly the configuration when I build wxWidgets. I builded wxWidgets as static and DLL. How can I know here is the conflit beetwen this libraries CRT?

[]s.

[HK]

It works at Linux OS, if
IMPLEMENT_APP(MyApp)
added.

[dsilvia]

As per C:\wxWidgets-2.6.3\src\common\string.cpp

Code: Select all

// ===========================================================================
// wxStringData class deallocation
// ===========================================================================

#if defined(__VISUALC__) && defined(_MT) && !defined(_DLL)
#  pragma message (__FILE__ ": building with Multithreaded non DLL runtime has a performance impact on wxString!")
void wxStringData::Free()
{
    free(this);
}
#endif

Which means that your wxWidgets libraries in vc_lib and your current code you're working with in Visual Studio 2005 must be in synch. If one qualifies to have the subject member function defined and included, so must the other, and the converse is true.

I had built my vc_lib using DialogBlocks which defaults to DLLs, so, the above code was never compiled into my wxWidgets libraries for vc_lib. Now, I went to Visual Studio 2005 Express to build some existing code and it defaulted to /MT. This meant that the above code was compiled into my application, so up popped the unresolved references. On changing to /MD everything was hunkey-dorey!

HTH,
Dave S.