can you add a multi window example? about examples_win32

[gammasoft71]

Hello,

You just have to define and associate a WndProc for each window.

The following example shows how to create two windows, we associate to each of them a WndProc function.
When you click on a window, a MessageBox appears mentioning which window has received the mouse down message.
Only window 1 closes the application when you click the close button.

#pragma comment(linker,"\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")

#include <Windows.h>
#include <CommCtrl.h>

HWND window1 = nullptr;
WNDPROC defWndProcWindow1 = nullptr;

HWND window2 = nullptr;
WNDPROC defWndProcWindow2 = nullptr;

LRESULT CALLBACK WndProcWindow1(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
  if (message == WM_CLOSE && hwnd == window1) PostQuitMessage(0);
  if (message == WM_LBUTTONDOWN) MessageBox(window1, L"Window1 click", L"", MB_OK);
  return CallWindowProc(defWndProcWindow1, hwnd, message, wParam, lParam);
}

LRESULT CALLBACK WndProcWindow2(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
  if (message == WM_CLOSE && hwnd == window2) CloseWindow(window2);
  if (message == WM_LBUTTONDOWN) MessageBox(window2, L"Window2 click", L"", MB_OK);
  return CallWindowProc(defWndProcWindow2, hwnd, message, wParam, lParam);
}

int main() {
  window1 = CreateWindowEx(0, WC_DIALOG, L"Window1", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 300, nullptr, nullptr, nullptr, nullptr);
  defWndProcWindow1 = (WNDPROC)SetWindowLongPtr(window1, GWLP_WNDPROC, (LONG_PTR)WndProcWindow1);
  ShowWindow(window1, SW_SHOW);

  window2 = CreateWindowEx(0, WC_DIALOG, L"Window2", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 300, nullptr, nullptr, nullptr, nullptr);
  defWndProcWindow2 = (WNDPROC)SetWindowLongPtr(window2, GWLP_WNDPROC, (LONG_PTR)WndProcWindow2);
  ShowWindow(window2, SW_SHOW);

  MSG message = { 0 };
  while (GetMessage(&message, nullptr, 0, 0))
    DispatchMessage(&message);
  return (int)message.wParam;
}

But if you want to use a GUI close to the Win32 API, but much easier to use.
I suggest you to look at my xtd project.

Here is the same example with xtd :

#include <xtd/xtd>

using namespace xtd::forms;

int main() {
  form form1;
  form1.text("form1");
  form1.click += [&] {
    message_box::show(form1, "form1 click");
  };
  
  form form2;
  form2.text("form2");
  form2.click += [&] {
    message_box::show(form2, "form2 click");
  };
  form2.show();
  
  application::run(form1);
}

Regards,
Gammasoft