C++ win32 GUI code in classes - c++

Question

I made a simple win32 application. I placed my GUI code in a class, but I got some bugs.
Main.cpp
#include "Form.h"
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
Form form(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
form.show();
form.set_title("Testing this stuff");
}
Form.h
#pragma once
#include <Windows.h>
class Form
{
private:
HWND hwnd;
char* title = "Form";
static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
public:
Form(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow);
void set_title(const char* title);
void show();
~Form();
};
Form.cpp
#include "Form.h"
LRESULT CALLBACK Form::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg) {
case WM_KEYDOWN:
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_COMMAND:
switch (LOWORD(wParam)) {
}
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
Form::Form(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = &WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);// LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_MYICON));
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wc.lpszMenuName = NULL;
wc.lpszClassName = "test_class";
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); // (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_MYICON), IMAGE_ICON, 16, 16, 0);
if (RegisterClassEx(&wc))
{
hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, "test_class", title, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 300, NULL, NULL, NULL, NULL);
if (!hwnd == NULL)
{
ShowWindow(this->hwnd, SW_NORMAL);
UpdateWindow(this->hwnd);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
}
void Form::show() {
ShowWindow(this->hwnd, SW_NORMAL);
UpdateWindow(this->hwnd);
}
void Form::set_title(const char* title) {
SetWindowText(this->hwnd, title);
}
Form::~Form()
{
}
Now, what I wanted it to do is show the window and change the title; however, the GUI doesn't show up and the set_title doesn't work either. I also tried for the set_title:
SendMessage(this->hwnd, WM_SETTEXT, 0, (LPARAM)title);
This doesn't work either. Also, this->hwnd is a variable I made in my class. I'm uncertain what's wrong and how to fix it. I want to make a similar Form system like Windows Form Application from .NET but without using any framework (only win32).