how to display large data in wxListCtrl with using concept of wxThread

Question

I'm capable to fill the database table in wxListCtrl, my problem is to handle high range of data, I want to do this with the help of thread concept , perhaps it will save to hang the frame because of high amount of data. I'm new in thread concept so your single lines will be a book for me.

Update:

My question was- how to display large data in wxListCtrl with using concept of wxThread so for this I used thread concept I add two more files thread.c and thread.cpp my entry thread code is shown below

void *MyThread :: Entry()
{
    int i=1,j,k=0;
    while(i!=400)
    {
        long index=this->temp->data_list_control->InsertItem(i,wxT("amit"));
        for(j=1; j<3; j++) {
            this->temp->data_list_control->SetItem(index,j,wxT("pathak"));
        }

        k++;

        if(k==30) {
            this->Sleep(1000);
            k=0;
        }
        i++;
    }
}

It is sometimes working fine but when I try to increase the value of i, it shows an error like

-*showingdatainwxlistctrl: ../../src/XlibInt.c:595: _XPrivSyncFunction: Assertion `dpy->synchandler == _XPrivSyncFunction' failed.*

or sometime it gives error like

***[Xcb] xcb_io.c:378: _XAllocID: Assertion `ret != inval_id' failed***

Why it is happening to me?

Answer 1

1. When you are performing high range of data you are bound to use WXThread in your program
2. Firstly was trying to fill wxListCtrl from wxEntry point, it was wrong u can not hit any main thread control from entry point, it does not give error, but it is a wrong concept

3. Here u need to pass the data to handler, handler will use it to fill wxListCtrl code look like this->

   void *MyThread :: Entry() { int a; Handler handler_obj; char *database_name=DATABASE_NAME; connection =handler_obj.handler(101,database_name); if(connection==NULL) { wxMessageBox(wxT("CAN NOT CONNECT TO DATABASE"), wxT("Message"), wxOK | wxICON_INFORMATION, NULL, -1, -1); } else { List_Ctrl_Data list_ctrl_data_object; table_data=list_ctrl_data_object.fetch_table(connection);

       MYSQL_ROW row;
       while((row=mysql_fetch_row(table_data))!=NULL)
           {
   
               wxCommandEvent event( wxEVT_COMMAND_TEXT_UPDATED, 100000 );
               void *row_data;
               row_data=(void *)row;
               event.SetClientData(row_data);
               temp->GetEventHandler()->AddPendingEvent( event );
               this->Sleep(1000);
           }
   }
   

   }

to handle the row data we will use

void Id_Search_Report::onNumberUpdate(wxCommandEvent& evt)
    {
        int j;
        void* hold_row;
        hold_row=(void *)evt.GetClientData();
        MYSQL_ROW row;
        row=(MYSQL_ROW)hold_row;

            const char* chars1 = row[0];
            wxString mystring1(chars1, wxConvUTF8);
            long index=data_list_control->InsertItem(this->counter,mystring1);
        this->counter++;
            for(j=1;j<12;j++)
                {
                const char* chars2=row[j];
                wxString mystring2(chars2,wxConvUTF8);
                data_list_control->SetItem(index,j,mystring2);
                }

    }

thread is returning a row , this method will handle the row and fill ListCtrl , it is a proper way to fill wxListCtrl.