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c++ - 尝试在 Visual Studio 上用 C++ 创建桌面应用程序

问题描述

我正在尝试编写一个桌面应用程序，该应用程序最终将与 arduino（尚未进入）进行通信，以控制我房间和 PC 周围的 LED 灯。我在 microsoft 的关于如何创建桌面应用程序的页面上，并从他们那里复制了 99% 的这个程序，所以我可以玩弄它，看看它做了什么。但是，由于两个问题，我什至无法运行该东西。

  1. 当我尝试使用 WndProc 时，它显示“未找到 WndProc 的函数定义，并且，
LRESULT CALLBACK WndProc(
    _In_ HWND   hWnd,
    _In_ UINT   message,
    _In_ WPARAM wParam,
    _In_ LPARAM lParam
);
  1. 当我尝试使用 WinMain 时，它显示“WinMain 的注释不一致：此实例没有注释”
int WINAPI WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow)

这是完整的源代码：


#include <windows.h>
#include <tchar.h>
#include <stdlib.h>
#include <string.h>


static TCHAR szWindowClass[] = _T("Colour Control");
static TCHAR szTitle[] = _T("Colour Control 1.0");

HINSTANCE hInst;

int CALLBACK WinMain(
    _In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPSTR     lpCmdLine,
    _In_ int       nCmdShow
);

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

int WINAPI WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);

    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Windows Desktop Guided Tour"),
            NULL);

        return 1;
    }



    // The parameters to CreateWindow explained:
    // szWindowClass: the name of the application
    // szTitle: the text that appears in the title bar
    // WS_OVERLAPPEDWINDOW: the type of window to create
    // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
    // 500, 100: initial size (width, length)
    // NULL: the parent of this window
    // NULL: this application dows not have a menu bar
    // hInstance: the first parameter from WinMain
    // NULL: not used in this application
    HWND hWnd = CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        500, 100,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hWnd)
    {
        MessageBox(NULL,
            _T("Call to CreateWindow failed!"),
            _T("Windows Desktop Guided Tour"),
            NULL);

        return 1;
    }
    // Store instance handle in our global variable
    hInst = hInstance;

    // The parameters to ShowWindow explained:
    // hWnd: the value returned from CreateWindow
    // nCmdShow: the fourth parameter from WinMain
    ShowWindow(hWnd,
        nCmdShow);
    UpdateWindow(hWnd);

    // Main message loop:
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

标签： c++desktop

解决方案

为什么要在 .cpp 文件中定义 WinMain 和 WndProc。您不应该这样做，而是必须只提供这些函数的定义。喜欢 WindowsProc

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{ 
    switch(msg)
    {
        case WM_LBUTTONDOWN:
          //Code 
          break;                  
        case WM_CLOSE:
          DestroyWindow(hwnd);
          break;
        case WM_DESTROY:
          PostQuitMessage(0);
          break;
        default:
          return DefWindowProc(hwnd, msg, wParam, lParam);
    } 
    return 0;

}

您必须删除 WndProc 和 WinMain 的减速。

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