WinAPI nothing happens on button click - c++

Question

My Question is: In the below C++ code, why does clicking on the button do nothing while it is supposed to call MessageBox from WndProc1?
P.S: After compiling, I got some errors like the following:
"C:\Windows\SysWOW64\ntdll.dll", Can't find or open PDB file.
Code:
#include <Windows.h>
LRESULT CALLBACK WndProc(
_In_ HWND hwnd,
_In_ UINT uMsg,
_In_ WPARAM wParam,
_In_ LPARAM lParam
);
LONG WINAPI WndProc1(
_In_ HWND hwnd_button,
_In_ UINT uMsg,
_In_ WPARAM wParam,
_In_ LPARAM lParam
);
//Точка входа в программу
int WINAPI WinMain
(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
{
//Создаем класс окна
WNDCLASS WindowClass;
//Заполняем структуру
WindowClass.style = 0;
WindowClass.lpfnWndProc = (WNDPROC)WndProc;
WindowClass.cbClsExtra = 0;
WindowClass.cbWndExtra = 0;
WindowClass.hInstance = hInstance;
WindowClass.hIcon = LoadIcon(hInstance,
(LPCTSTR)IDI_APPLICATION);
WindowClass.hCursor = LoadCursor(NULL, IDC_ARROW);
WindowClass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
WindowClass.lpszMenuName = 0;
WindowClass.lpszClassName = TEXT("Class");
//Зарегистируем класс окна
RegisterClass(&WindowClass);
//Создаем переменную, в которой поместим идентификатор окна
HWND hWnd;
hWnd = CreateWindow(TEXT("Class"), TEXT("ClickTest"),
WS_OVERLAPPEDWINDOW, 0, 0, 500, 300, NULL, NULL, hInstance, NULL);
//Создаем кнопку
HWND hWnd_button;
hWnd_button = CreateWindow(TEXT("button"), TEXT("Click me"), WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
10, 10, 80, 30, hWnd, (HMENU)10000, hInstance, NULL);
//показать окно
ShowWindow(hWnd, nCmdShow);
//обновить содержимое окна
UpdateWindow(hWnd);
//Создадим переменную для храненния сообщений
MSG msg;
//Создадим цикл обработки сообщений
while(GetMessage(&msg, NULL,0 ,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LONG WINAPI WndProc1(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{
switch (Message){
case WM_COMMAND:
if(LOWORD(wparam)==10000)
{
MessageBox(hwnd, TEXT("Button Pressed"), TEXT(""), 0);
}
return 0;}}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT PS;
switch(message)
{
case WM_CREATE:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_PAINT:
BeginPaint(hWnd, &PS);
EndPaint(hWnd, &PS);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
Now working, just added button function as one of the cases to WndProc (WndProc1 deleted)
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wparam, LPARAM lParam)
{
PAINTSTRUCT PS;
switch(message)
{
case WM_CREATE:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_PAINT:
BeginPaint(hWnd, &PS);
EndPaint(hWnd, &PS);
break;
case WM_COMMAND:
if(LOWORD(wparam)==10000)
{
MessageBox(hWnd, TEXT("Button Pressed"), TEXT(""), 0);
}
default:
return DefWindowProc(hWnd, message, wparam, lParam);
}
return 0;
}
One final newbie question: what's the difference between LRESULT CALLBACK and LONG WINAPI then?

Answer 1

Do this modification on WndProc:
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT PS;
switch(message)
{
case WM_COMMAND:
if(LOWORD(wParam)==10000)
{
MessageBox(hWnd, TEXT("Button Pressed"), TEXT(""), 0);
}
break;
case WM_CREATE:
break;
// ...
I added WM_COMMAND in the switch/case of WndProc.

Answer 2

How do you expect WndProc1 to be called? It isn't associated to any window class... You have to handle the WM_COMMAND inside WndProc (buttons, as well as other common controls, notify their parent of their events via WM_COMMAND).