c++ - 在 OO 中创建一个窗口

Question

这是我的标题

#pragma once
#ifndef BASE_H
#define BASE_H

#include <Windows.h>
#include <windowsx.h>

class Base
{
    HWND hWnd;
    WNDCLASSEX WndCls;
    HRESULT Hr;
public:
    Base();
    static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
    void RegisterWnd(HINSTANCE hInstance);
    void ShowWnd(int nCmdShow);
    ~Base();
};

#endif

这是我的base.cpp

#include "Base.h"


Base::Base()
{
}

static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    // sort through and find what code to run for the message given
    switch (message)
    {
        // this message is read when the window is closed
    case WM_DESTROY:
    {
        // close the application entirely
        PostQuitMessage(0);
        return 0;
    } break;
    }

    // Handle any messages the switch statement didn't
    return DefWindowProc(hWnd, message, wParam, lParam);
}

void Base::RegisterWnd(HINSTANCE hInstance)
{
    ZeroMemory(&WndCls, sizeof(WNDCLASSEX));
    WndCls.cbSize = sizeof(WNDCLASSEX);
    WndCls.hbrBackground = (HBRUSH)COLOR_WINDOW;
    WndCls.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndCls.hIcon = LoadIcon(hInstance, NULL);
    WndCls.hIconSm = LoadIcon(hInstance, NULL);
    WndCls.hInstance = hInstance;
    WndCls.lpfnWndProc = WndProc;
    WndCls.lpszClassName = "ClsName";
    WndCls.style = CS_HREDRAW | CS_VREDRAW;

    Hr = RegisterClassEx(&WndCls);
    if (FAILED(Hr))
        MessageBox(NULL, "Window Class failed to register.", "ERROR", MB_OK);

    hWnd = CreateWindowEx(
        NULL,
        "WndClassName",
        "WndName",
        WS_OVERLAPPEDWINDOW,
        100, 100,
        480, 640,
        NULL,
        NULL,
        hInstance,
        NULL);
    if (FAILED(hWnd))
        MessageBox(NULL, "Window Class failed to create", "ERROR", MB_OK);
}

void Base::ShowWnd(int nCmdShow)
{
    Hr = ShowWindow(hWnd, nCmdShow);
    if (FAILED(Hr))
        MessageBox(NULL, "Failed to display Window", "ERROR", MB_OK);
}

Base::~Base()
{
}

这是我的 main.cpp

#include "Base.h"
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
    Base CreateWnd;

    CreateWnd.RegisterWnd(hInstance);
    CreateWnd.ShowWnd(nCmdShow);

    MSG Msg;
    while (GetMessage(&Msg, NULL, 0, 0))
    {
        // translate keystroke messages into the right format
        TranslateMessage(&Msg);

        // send the message to the WindowProc function
        DispatchMessage(&Msg);
    }

    // return this part of the WM_QUIT message to Windows
    return Msg.wParam;
}

问题是，我不断收到我不理解的错误消息。对不起，不好的解释..仍然是编程的学生......

更新:上面的错误已通过替换得到更正

static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

与

LRESULT CALLBACK Base::WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

感谢 ravi 和 IInspectable 的快速帮助。

现在我遇到了另一个错误 D:当我点击调试时，一切运行正常，但没有任何显示。没有窗口显示。 Visual Studio 以“就绪”状态完美运行。 (抱歉，我不想提出另一个新问题，因为它仍然与在 oo 中创建窗口有关

第二次更新:我在 CreateWindowEx 中的类名与 RegisterWnd 中的类名不同..我的错。再次感谢 IInspectable 的帮助。

Answer 1

static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

你必须用类范围定义它，或者编译器如何知道它是全局静态还是类的静态成员。所以应该是

LRESULT CALLBACK Base::WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)