类

Question

我制作了一个简单的win32应用程序。我把我的GUI代码放在一个类中，但是我遇到了一些错误。

Main.cpp的

#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()
{
}

现在，我想要它做的是显示窗口并更改标题;但是，GUI不会显示，而set_title也不起作用。我也尝试过set_title：

SendMessage(this->hwnd, WM_SETTEXT, 0, (LPARAM)title);

这也不起作用。另外，this->hwnd是我在班上制作的变量。我不确定错误是什么，以及如何解决它。我想在.NET中制作类似Windows Form Application的Form系统，但不使用任何框架（仅限win32）。