ListBox Dialog

A compact working example of driving a ListBox control from a modal dialog. The Add button copies the text from an edit box into the list with LB_INSERTSTRING (position 0 = top), the Delete button removes whatever is currently selected by asking for LB_GETCURSEL first, and Ok closes the dialog. It also shows a few nice-to-haves: single-instance enforcement with OpenMutex, adding custom entries to the system menu in WM_INITDIALOG, and setting the window icon. Use it as a template whenever you need the basic add/remove/selected-item triad for a list control.

/////////////////////////////////////////////////////////////////////

#include <Windows.H>
#include <WindowsX.H>
#include <ShellAPI.H>
#include <Stdio.H>
#include <Stdlib.H>

#include "Headers/Definitions.H"
#include "Headers/Functions.H"
#include "Dialogs/MainDialog.H"
#include "Dialogs/AboutDialog.H"

/////////////////////////////////////////////////////////////////////

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevious, LPSTR CmdLine, int CmdShow)
{
	if(OpenMutex(SYNCHRONIZE, FALSE, TitleCaption))
	{
		MessageBox (NULL, "Only One Instance Can Be Run At A Time!" , TitleCaption, 0 + MB_ICONASTERISK + MB_SYSTEMMODAL);
		return 0;
	}
	CreateMutex(NULL, FALSE, TitleCaption);

	MainInstance = hInstance;

	DialogBox(MainInstance,MAKEINTRESOURCE(100),0,MainDialog);

	return 0;
}

The dialog procedure:

char Temp[1024];

BOOL CALLBACK MainDialog(HWND hDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
{
	static HWND InputText_hWnd;
	static HWND ListBox;

	static HMENU SystemMenu;

	while(1) // Loop Forever
	{
		if(Msg==WM_INITDIALOG)
		{
			MainDialog_hWnd=hDlg;

			SystemMenu = GetSystemMenu(MainDialog_hWnd,FALSE);
			AppendMenu(SystemMenu,MF_SEPARATOR,0,0);
			AppendMenu(SystemMenu,MF_STRING,1000,"www.NetWorkDLS.Com");
			AppendMenu(SystemMenu,MF_STRING,1001,"Version");

			SendMessage(MainDialog_hWnd,(UINT)WM_SETTEXT,(WPARAM)0,(LPARAM)TitleCaption);
			SendMessage(MainDialog_hWnd,WM_SETICON,TRUE,(LPARAM)LoadIcon(GetWindowInstance(MainDialog_hWnd),MAKEINTRESOURCE(300)));

			InputText_hWnd = GetDlgItem(MainDialog_hWnd, 1500);
			ListBox = GetDlgItem(MainDialog_hWnd, 2000);

			CenterWindow(MainDialog_hWnd);
			break;
		}

		if(Msg==WM_COMMAND)
		{
			if(wParam==100) // Add Button
			{
				sprintf(Temp,"%s", GetText(InputText_hWnd));
				SendMessage(ListBox,LB_INSERTSTRING,0,(LPARAM)(LPSTR)Temp);
				SetText(InputText_hWnd,"");
			}

			if(wParam==101) // Delete Button
			{
				DWORD LineNumber;
				LineNumber = SendMessage(ListBox,LB_GETCURSEL,0,0);
				SendMessage(ListBox,LB_DELETESTRING,LineNumber,0);
			}

			if(wParam==102) // Ok Button
			{
				EndDialog(MainDialog_hWnd,0);
			}
			break;
		}

		if(Msg==WM_SYSCOMMAND)
		{
			if(LOWORD(wParam)==1000) //- NetWorkDLS.Com (SysMenu Command)
			{
				ShellExecute(0,"Open","Http://www.NetWorkDLS.com",NULL,NULL,SW_SHOWNORMAL);
			}
			if(LOWORD(wParam) == 1001) //- Version (SysMenu Command)
			{
				MessageBox(MainDialog_hWnd, FileVersion, TitleCaption, 0 + MB_ICONASTERISK + MB_TASKMODAL);
			}
		}

		if(Msg==WM_CLOSE) //Exit (Windows Message)
		{
			KillTimer(MainDialog_hWnd,0);
			EndDialog(MainDialog_hWnd,0);
		}

		if(Msg==WM_TIMER) //Timer (Windows Message)
		{

		}
		break;
	}
	return 0;
}

One caution carried over from the original: LB_DELETESTRING with no selection passes LB_ERR (-1) as the index, which on some Windows versions deletes the last item rather than doing nothing - check the return of LB_GETCURSEL before deleting if that matters to you.