WinAPI点击按钮时什么也没发生

WinAPI nothing happens on button click

本文关键字：什么 按钮 WinAPI      更新时间：2023-10-16

我的问题是:在下面的c++代码中，为什么点击按钮什么都不做，而它应该从WndProc1调用MessageBox ?

p。S:编译后，我得到了一些错误，如下所示:

"C:WindowsSysWOW64ntdll.dll", Can't find or open PDB file.
代码:

#include <Windows.h>
LRESULT CALLBACK WndProc(
  _In_  HWND hwnd,
  _In_  UINT uMsg,
  _In_  WPARAM wParam,
  _In_  LPARAM lParam
);
LONG WINAPI WndProc1(
  _In_  HWND hwnd_button,
  _In_  UINT uMsg,
  _In_  WPARAM wParam,
  _In_  LPARAM lParam
);
//Точка входа в программу
int WINAPI WinMain
    (
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
{
//Создаем класс окна
WNDCLASS WindowClass;
//Заполняем структуру 
WindowClass.style       = 0;
WindowClass.lpfnWndProc     = (WNDPROC)WndProc;
WindowClass.cbClsExtra      = 0;
WindowClass.cbWndExtra      = 0;
WindowClass.hInstance       = hInstance;
WindowClass.hIcon       = LoadIcon(hInstance,
                  (LPCTSTR)IDI_APPLICATION);
WindowClass.hCursor     = LoadCursor(NULL, IDC_ARROW);
WindowClass.hbrBackground   = (HBRUSH)(COLOR_WINDOW+1);
WindowClass.lpszMenuName    = 0;
WindowClass.lpszClassName   = TEXT("Class");
//Зарегистируем класс окна
RegisterClass(&WindowClass);
//Создаем переменную, в которой поместим идентификатор окна
HWND hWnd;
hWnd = CreateWindow(TEXT("Class"), TEXT("ClickTest"),
       WS_OVERLAPPEDWINDOW, 0, 0, 500, 300, NULL, NULL, hInstance, NULL); 
//Создаем кнопку
HWND hWnd_button;
hWnd_button = CreateWindow(TEXT("button"), TEXT("Click me"), WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
10, 10, 80, 30, hWnd, (HMENU)10000, hInstance, NULL);
//показать окно
ShowWindow(hWnd, nCmdShow);
//обновить содержимое окна
UpdateWindow(hWnd);
//Создадим переменную для храненния сообщений
MSG msg;
//Создадим цикл обработки сообщений
while(GetMessage(&msg, NULL,0 ,0))
{
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}
return 0;
}
LONG WINAPI WndProc1(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{
switch (Message){
case WM_COMMAND:
    if(LOWORD(wparam)==10000)
    {
        MessageBox(hwnd, TEXT("Button Pressed"), TEXT(""), 0);
    }
    return 0;}}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT PS;
switch(message)
{
case WM_CREATE:
    break;
case WM_DESTROY:
    PostQuitMessage(0);
    break;
case WM_PAINT:
    BeginPaint(hWnd, &PS);
    EndPaint(hWnd, &PS);
    break;
default:
    return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

正在工作，刚刚添加了按钮功能，作为WndProc的一个案例(WndProc1删除)

  LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wparam, LPARAM lParam)
 {
 PAINTSTRUCT PS;
 switch(message)
 {
 case WM_CREATE:
    break;
 case WM_DESTROY:
    PostQuitMessage(0);
    break;
case WM_PAINT:
    BeginPaint(hWnd, &PS);
    EndPaint(hWnd, &PS);
    break;
case WM_COMMAND:
    if(LOWORD(wparam)==10000)
    {
        MessageBox(hWnd, TEXT("Button Pressed"), TEXT(""), 0);
    }
default:
    return DefWindowProc(hWnd, message, wparam, lParam);
}
return 0; 
  }

最后一个新手问题:LRESULT CALLBACK和LONG WINAPI有什么区别?

修改WndProc:

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT PS;
switch(message)
{
case WM_COMMAND:
    if(LOWORD(wParam)==10000)
    {
        MessageBox(hWnd, TEXT("Button Pressed"), TEXT(""), 0);
    }
    break;
case WM_CREATE:
    break;
// ...

我在WndProc的switch/case中添加了WM_COMMAND

您希望如何调用WndProc1 ?它不关联到任何窗口类…你必须在WndProc中处理WM_COMMAND(按钮以及其他常见控件，通过WM_COMMAND通知它们的父它们的事件)。

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