Question

我刚开始在网上学习C ++后开始了解WINAPI。我知道我应该阅读更多有关WINAPI的内容，但我想同时进行学习和编码。

这是我的代码。它的目的是检查WINAPI中的函数，但我一直收到错误。我的代码出了什么问题？

#ifndef UNICODE
#define UNICODE
#endif

#include <windows.h>
#include <WinUser.h>



LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";

WNDCLASS wc = {};

wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;

RegisterClass(&wc);

// Create the window.

HWND hwnd = CreateWindowEx(
    0,                              // Optional window styles.
    CLASS_NAME,                     // Window class
    L"Learn to Program Windows",    // Window text
    WS_OVERLAPPEDWINDOW,            // Window style

    // Size and position
    CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

    NULL,       // Parent window
    NULL,       // Menu
    hInstance,  // Instance handle
    NULL        // Additional application data
    );

if (hwnd == NULL)
{
    return 0;
}

ShowWindow(hwnd, nCmdShow);
HPOWERNOTIFY WINAPI RegisterPowerSettingNotification(_In_  HANDLE hwnd, _In_  LPCGUID GUID_LIDCLOSE_ACTION, _In_ DWORD DEVICE_NOTIFY_WINDOW_HANDLE);//the problem is HERE i think why is not accepting DEVICE_NOTIFY_WINDOW_HANDLE if i leave it blank it works and compile but i don't get a msg 

// Run the message loop.

MSG msg = {};
while (GetMessage(&msg, NULL, 0, 0))
{
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}

return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_POWERBROADCAST:
    PostQuitMessage(0);
    return 0;


case WM_DESTROY:
    PostQuitMessage(0);
    return 0;

case WM_PAINT:
{
    PAINTSTRUCT ps;
    HDC hdc = BeginPaint(hwnd, &ps);

    FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));

    EndPaint(hwnd, &ps);
}
return 0;

}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

错误：

Error   1   error C2143: syntax error : missing ')' before 'constant'   c:\users\0110\documents\visual studio 2013\projects\lidclosingevent\lidclosingevent\source.cpp  48  1   LidClosingEvent
Error   2   error C2143: syntax error : missing ';' before 'constant'   c:\users\0110\documents\visual studio 2013\projects\lidclosingevent\lidclosingevent\source.cpp  48  1   LidClosingEvent
Error   3   error C2059: syntax error : ')' c:\users\0110\documents\visual studio 2013\projects\lidclosingevent\lidclosingevent\source.cpp  48  1   LidClosingEvent
    4   IntelliSense: expected a ')'    c:\Users\0110\documents\visual studio 2013\Projects\LidClosingEvent\LidClosingEvent\Source.cpp  48  121 LidClosingEvent

我使用VS2013并以空项目开始。

Answer 1

看起来您将RegisterPowerSettingNotification函数签名复制到main方法中并更改了它的参数。

你有：

HPOWERNOTIFY WINAPI RegisterPowerSettingNotification(_In_  HANDLE hwnd, _In_  LPCGUID GUID_LIDCLOSE_ACTION, _In_ DWORD DEVICE_NOTIFY_WINDOW_HANDLE);

当你应该：

RegisterPowerSettingNotification(hWnd, &GUID_LIDCLOSE_ACTION, DEVICE_NOTIFY_WINDOW_HANDLE);

使用RegisterPowerSettingNotification时出现语法错误

1 个答案: