Creating a pointer to a widget(wxTextCtrl) in a function - c++

Question

I've trying to get a pointer to a widget (in the code it's named text). But at least I've got only this
error: no matching function for call to 'std::basic_ostream::basic_ostream(wxWindow*)'
my code:
gui.h
#include <wx/wx.h>
class wxWCK : public wxFrame
{
public:
wxWCK(const wxString& title);
void OnClickCon(wxCommandEvent& event);
void OnClickSta(wxCommandEvent& event);
private:
wxButton *connect;
wxButton *start;
wxTextCtrl *text;
};
const int ID_CON = 100;
const int ID_STA = 101;
const int ID_MF0 = 102;
const int ID_TEX = 103;
void Connect();
void Start();
and gui.cpp
#include "gui.h"
wxWCK::wxWCK(const wxString& title)
: wxFrame(NULL, ID_MF0, title, wxDefaultPosition, wxSize(400,300))
{
wxPanel *panel = new wxPanel(this, -1);
wxBoxSizer *vbox = new wxBoxSizer(wxVERTICAL);
wxBoxSizer *hbox1 = new wxBoxSizer(wxHORIZONTAL);
wxBoxSizer *hbox2 = new wxBoxSizer(wxHORIZONTAL);
//Outputwidget
text = new wxTextCtrl(panel, ID_TEX, _T(""),
wxPoint(-1, -1), wxSize(1000, 1000), wxTE_MULTILINE);
//redirecting stream to the outputwidget
//std::ostream stream(text);
stream << "Hello" << std::endl;
connect = new wxButton(panel, ID_CON, _T("Connect"));
start = new wxButton(panel, ID_STA, _T("Start"));
hbox1->Add(text);
hbox2->Add(connect);
hbox2->Add(start);
vbox->Add(hbox1, 1, wxEXPAND);
vbox->Add(hbox2, 0, wxALIGN_LEFT | wxRIGHT | wxBOTTOM, 10);
panel->SetSizer(vbox);
Connect(ID_CON, wxEVT_COMMAND_BUTTON_CLICKED,
wxCommandEventHandler(wxWCK::OnClickCon));
//Connect(ID_STA, wxEVT_COMMAND_BUTTON_CLICKED,
// wxCommandEventHandler(wxWCK::OnClickSta));
}
void wxWCK::OnClickCon(wxCommandEvent& WXUNUSED(event))
{ void Connect(); }
void wxWCK::OnClickSta(wxCommandEvent& WXUNUSED(event))
{ void Start(); }
void Connect()
{
//Try to get a pointer to 'text'
std::ostream stream(wxWindow::FindWindowById(ID_TEX));
stream << "Connected" << std::endl;
}
/*
void Start()
{
//Try to get a pointer to 'text'
std::ostream stream(wxWindow::FindWindowById(ID_TEX));
stream << "Started" << std::endl;
}
*/
I hope somebody can help me. A other solution can be to get the stream as global. But when I try to get the stream-declaration in the header, he says he dont know any text so I move the text-declaration outside the class and I got a muliple declaration error... I think, because I include the gui.h in gui.cpp and main.h .
-Casisto
edit:
I changed the the function to:
void Connect()
{
//Try to get a pointer to 'text'
std::ostream stream((wxTextCtrl*) wxWindow::FindWindowById(ID_TEX));
stream << "Connected" << std::endl;
}
Now I don't get a error or a warning, but when I click on "Connect"-Button, the wxTextCtrl get no "Input" (I mean, there is only "Hello" in there)

Answer 1

The initial error must have been from the old code of Connect() because wxWindow::FindWindowById() returns a wxWindow*.
First thing to try: change wxWCK::OnClickCon() to { (*text) << "Connected\n"; }. This should just work.
Next, if you really need that void Connect(), try again without creating the std::ostream (you don't really need it); something like { (*(wxTextCtrl*)wxWindow::FindWindowById(ID_TEX)) << "Connected\n"; }.
However, this might still not work, so make ID_CON = wxID_HIGHEST + 1, ID_STA = wxID_HIGHEST + 2 etc and try again. IIRC I've seen cases where ids with low values caused curious behaviour.

Answer 2

The error message doesn't fit the code you show, in it text is a wxTextCtrl, which derives from std::streambuf and so can be used to construct an associated std::ostream, and not a wxWindow.
IOW your code should work as shown, you must be not showing us everything.