How to use Static label and Buttons in Gui win32 Programming - c++

Question

I'm learning win32 Programming. In order to better comprehend the concepts of the programming in win32 framework, So that I am going to write a simple calculator. I design its view but now I want when a user click on a button, for example button 1, Its number shows on a static label. I used SetDlgItemText, But it doesn't work. I put the picture of the program in the following:
I have 12 button with IDs IDC_Button01 to IDC_Button12 and I have a static label element with IDC_Display ID. I put my code in the following section.
#include <windows.h>
#include <tchar.h>
#include "resource.h"
#pragma comment(linker, \
"\"/manifestdependency:type='Win32' "\
"name='Microsoft.Windows.Common-Controls' "\
"version='6.0.0.0' "\
"processorArchitecture='*' "\
"publicKeyToken='6595b64144ccf1df' "\
"language='*'\"")
#pragma comment(lib, "ComCtl32.lib")
// Step 4: the Window Procedure
INT_PTR CALLBACK DialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);
const char g_szClassName[] = "myWindowClass";
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
HWND hDlg;
BOOL ret;
MSG msg;
hDlg = CreateDialogParam(hInstance, MAKEINTRESOURCE(IDD_MainWindow), 0, DialogProc, 0);
ShowWindow(hDlg, nCmdShow);
// Step 3: The Message Loop
while ((ret = GetMessage(&msg, 0, 0, 0)) != 0) {
if (ret == -1) /* error found */
return -1;
if (!IsDialogMessage(hDlg, &msg)) {
TranslateMessage(&msg); /* translate virtual-key messages */
DispatchMessage(&msg); /* send it to dialog procedure */
}
}
return msg.wParam;
}
// Step 4: the Window Procedure
INT_PTR CALLBACK DialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDCANCEL:
SendMessage(hDlg, WM_CLOSE, 0, 0);
return TRUE;
case IDOK:
MessageBox(hDlg, TEXT("Program will quit."), TEXT("Message"), MB_ICONQUESTION);
PostQuitMessage(0);
return TRUE;
}
break;
case IDC_BUTTON1:
SetDlgItemText(hDlg, IDC_Display, TEXT("1"));
case WM_CLOSE:
if (MessageBox(hDlg, TEXT("Close the program?"), TEXT("Close"), MB_ICONQUESTION | MB_YESNO) == IDYES)
{
DestroyWindow(hDlg);
}
return TRUE;
case WM_DESTROY:
PostQuitMessage(0);
return TRUE;
}
return FALSE;
}

Answer 1

The resource ID is not a valid Windows message, the WM_COMMAND is used to send a notification to a parent window
INT_PTR CALLBACK DialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
..
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDC_BUTTON1: {
SetDlgItemText(hDlg, IDC_Display, TEXT("1"));
return TRUE;
} break;
break;
wParam is set to the control identifier.