Thread: problem with edit-window

hi

i'm just reading petzold and learning to programm the winapi. i'm doing this, by writing an ide (or gui if you want like that) for a command line tool i once wrote. i am setting up a control pannel with several buttons and one editwin, in which later the output of the command-line tool will be shown and can be edited.
to my problem: i read, that edit-windows do send messages of the type WM_COMMAND to the main window of the application. LOWORD(wParam) contains the ID and HIWORD(wParam) contains the action-code, lParam the handle of the child. But I don't receive messages like this in the main loop, which makes the check if the file needs to be safed sensless. why?

Code:

switch(message) {
case WM_CREATE:
	//define buttons
	...
	//Make Editwin
	hwndEditWin=CreateWindow(TEXT("edit"),NULL,
		WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL | WS_BORDER | ES_LEFT | ES_MULTILINE | ES_AUTOVSCROLL,
		0,0,0,0,hwnd, (HMENU) ID_EDITWIN, ((LPCREATESTRUCT) lParam)->hInstance,NULL);
		OldEditWin=(WNDPROC)SetWindowLong(hwndEditWin,GWL_WNDPROC,(LONG) EditWinProc);
...

case WM_COMMAND:
	//Reactions to the panel
	if(lParam) {
		switch(LOWORD(wParam)) {
		case ID_START:
				
			if( (int)SendMessage(hwndPanel[ID_OUTPUTDETMIN],BM_GETCHECK,0,0L) )
				strcat(szExternalProg,"-o- ");
			else if( (int)SendMessage(hwndPanel[ID_OUTPUTDETMED],BM_GETCHECK,0,0L) )
				strcat(szExternalProg,"-o ");
			else if( (int)SendMessage(hwndPanel[ID_OUTPUTDETMAX],BM_GETCHECK,0,0L) )
				strcat(szExternalProg,"-o+ ");
			else
				MessageBox(hwnd,TEXT("Fehler. Ausführlichkeit d. Ausgabe nicht bestimmt."),szAppName,MB_OK | MB_ICONSTOP);		
				if( (int)SendMessage(hwndPanel[ID_OUTPUTFORMCSV],BM_GETCHECK,0,0L) )
				strcat(szExternalProg,"-f csv ");
			else if( (int)SendMessage(hwndPanel[ID_OUTPUTFORMHTML],BM_GETCHECK,0,0L) )
				strcat(szExternalProg,"-f html ");
			else
				MessageBox(hwnd,TEXT("Fehler. Ausgabeformat nicht bestimmt."),szAppName,MB_OK | MB_ICONSTOP);

			system(szExternalProg);
				// Nachricht, dass die ausgabe des EditWin noch nicht implementiert ist direkt ins editwin schreiben
			SetWindowText(hwndEditWin,TEXT("Die Ausgabe der Zusammenfassung befindet sich in smt_out.csv, resp .html, da das EditWindow noch nicht voll funktionsfähig ist."));
				//Für erneutes drücken von start vorbereiten
			strcpy(szExternalProg,"smt ");
			return 0;
			case ID_END:
			if(HIWORD(wParam)==BN_CLICKED) 
				SendMessage(hwnd,WM_CLOSE,0,0);
			return 0;
			case ID_EDITWIN:
			MessageBox(hwnd,TEXT("Edit control is sending messages."),szAppName,MB_OK | MB_ICONSTOP);
			switch(HIWORD(wParam)) {
			
			case EN_UPDATE:
				bNeedSave = TRUE;
				return 0;
			
			case EN_ERRSPACE:
			case EN_MAXTEXT:
				MessageBox(hwnd,TEXT("Edit control out of space."),szAppName,MB_OK | MB_ICONSTOP);
				return 0;
			}
			case ID_OUTPUTFORMCSV:
			SendMessage(hwndPanel[ID_OUTPUTFORMHTML],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTFORMCSV],BM_SETCHECK,1,0L);
			return 0;
			case ID_OUTPUTFORMHTML:
			SendMessage(hwndPanel[ID_OUTPUTFORMCSV],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTFORMHTML],BM_SETCHECK,1,0L);
			return 0;
			case ID_OUTPUTDETMIN:
			SendMessage(hwndPanel[ID_OUTPUTDETMAX],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTDETMED],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTDETMIN],BM_SETCHECK,1,0L);
			return 0;
			case ID_OUTPUTDETMED:
			SendMessage(hwndPanel[ID_OUTPUTDETMIN],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTDETMAX],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTDETMED],BM_SETCHECK,1,0L);
			return 0;
	
		case ID_OUTPUTDETMAX:
			SendMessage(hwndPanel[ID_OUTPUTDETMIN],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTDETMED],BM_SETCHECK,0,0L);
			SendMessage(hwndPanel[ID_OUTPUTDETMAX],BM_SETCHECK,1,0L);
			return 0;
		}
	}
	else switch(LOWORD(wParam)) {
		//Reactions to the Menu

		case ID_DATEI_NEU:
			if(bNeedSave && (IDCANCEL == AskAboutSave(hwnd,szTitleName)))
				return 0;
				SetWindowText(hwndEditWin,TEXT("\0"));
			szFileName[0] = '\0';
			szTitleName[0] = '\0';
			DoCaption(hwnd,szTitleName);
			bNeedSave = FALSE;
			return 0;
			case ID_DATEI_FFNEN:
		case ID_DATEI_SPEICHERN:
		...
		}
return 0;

.....
.....

is it because i'm giving the edit win another procedure to run for the keybord interface? (looking like the following)

Code:

LRESULT CALLBACK EditWinProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	
	switch(message) {
	
	case WM_KEYDOWN: 
		if(wParam==VK_TAB) {
			if(GetKeyState(VK_SHIFT)<0)
				SetFocus(GetDlgItem(GetParent(hwnd),ID_START));
		}
		break;

	case WM_SETFOCUS:
		idFocus = ID_EDITWIN;
		break;
	}
	
	if((wParam==VK_TAB) && (GetKeyState(VK_SHIFT) <0))
		return 0;
	else
		return CallWindowProc(OldEditWin,hwnd,message,wParam, lParam);
}

i'll post more proper formatet code next time. anyway, i found the error, which was a pretty simple one. i had ID_EDITWIN defined like that:

#define NUMOFBUTTONS 14
#define ID_EDITWIN NUMOFBUTTONS+1

which causes somehow the edit window not sending messages to the main window. (what the problem was). however, writin it like this:

#define NUMOFBUTTONS 14
#define (ID_EDITWIN NUMOFBUTTONS+1)

works perfectly good.

thank you for helping

another question. i set the number of text in the dit window to unlimited (well, limited by memory) with:

Code:

SendMessage(hwndEditWin,EM_LIMITTEXT,-1,0L);

lets say i open a 25meg text file in that window. it allocates 25megs all alone and cares about the input. when i ope a new file, this memory stays allocated, cause i simply open a new one with:

Code:

case ID_DATEI_NEU:
   if(bNeedSave && (IDCANCEL == AskAboutSave(hwnd,szTitleName)))
      return 0;

   SetWindowText(hwndEditWin,TEXT("\0"));
   szFileName[0] = '\0';
   szTitleName[0] = '\0';
   DoCaption(hwnd,szTitleName);
   bNeedSave = FALSE;
   return 0;

My qustion: Is it possible to tell the edit window to free al unused space (means all the space behind the termination '\0'?

thank you