C++ 在Win32桌面应用程序上创建按钮时出错
我正试图在Windows32桌面应用程序的主窗口上创建一个按钮,但当我运行该按钮时,该窗口显示“Hello,Windows Desktop!”但该按钮不显示,我不确定原因。我认为问题出在“HWND hwndButton=CreateWindow”上,但我不确定问题是什么,或者我可能遗漏了什么。我的代码如下所示:C++ 在Win32桌面应用程序上创建按钮时出错,c++,user-interface,winapi,button,desktop,C++,User Interface,Winapi,Button,Desktop,我正试图在Windows32桌面应用程序的主窗口上创建一个按钮,但当我运行该按钮时,该窗口显示“Hello,Windows Desktop!”但该按钮不显示,我不确定原因。我认为问题出在“HWND hwndButton=CreateWindow”上,但我不确定问题是什么,或者我可能遗漏了什么。我的代码如下所示: #include <windows.h> #include <stdlib.h> #include <string.h> #include <t
#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>
#define IDC_BUTTON 3456
// Global variables
// The main window class name.
static TCHAR szWindowClass[] = _T("CD_ROM_READER_APP");
// The string that appears in the application's title bar.
static TCHAR szTitle[] = _T("CD Rom Reader App");
HINSTANCE hInst;
// Forward declarations of functions included in this code module:
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int CALLBACK WinMain(
_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPSTR lpCmdLine,
_In_ 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 + 2);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);
if (!RegisterClassEx(&wcex))
{
MessageBox(NULL,
_T("Call to RegisterClassEx failed!"),
_T("CD Rom Reader App"),
NULL);
return 1;
}
// Store instance handle in our global variable
hInst = hInstance;
// 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 does 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,
1000, 500,
NULL,
NULL,
hInstance,
NULL
);
if (!hWnd)
{
MessageBox(NULL,
_T("Call to CreateWindow failed!"),
_T("CD Rom Reader App"),
NULL);
return 1;
}
// 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;
}
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
TCHAR greeting[] = _T("Hello, Windows desktop!");
switch (message)
{
case WM_CREATE:
return 0;
case WM_COMMAND:
{
switch (LOWORD(wParam))
{
case IDC_BUTTON:
HWND hwndButton = CreateWindow(
L"BUTTON", // Predefined class; Unicode assumed
L"OK", // Button text
WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, // Styles
10, // x position
10, // y position
100, // Button width
100, // Button height
hWnd, // Parent window
NULL, // No menu.
(HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE),
NULL); // Pointer not needed.
//do whatever you want to do here when button is pressed
break;
}
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// Here your application is laid out.
// For this introduction, we just print out "Hello, Windows desktop!"
// in the top left corner.
TextOut(hdc,
5, 5,
greeting, _tcslen(greeting));
// End application-specific layout section.
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
return 0;
}
#包括
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#定义IDC_按钮3456
//全局变量
//主窗口类名称。
静态TCHAR szWindowClass[]=“CD_ROM_READER_APP”);
//显示在应用程序标题栏中的字符串。
静态TCHAR szTitle[]=“CD-Rom阅读器应用程序”);
HINSTANCE hInst;
//转发此代码模块中包含的函数声明:
LRESULT回调WndProc(HWND、UINT、WPARAM、LPARAM);
int回调WinMain(
_在uhinstance中,
_在当前情况下,
_在LPSTR lpCmdLine中,
_In_uuint 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=加载图标(hInstance,IDI_应用程序);
wcex.hCursor=LoadCursor(空,IDC_箭头);
wcex.hbrBackground=(HBRUSH)(彩色窗口+2);
wcex.lpszMenuName=NULL;
wcex.lpszClassName=szWindowClass;
wcex.hIconSm=加载图标(wcex.hInstance,IDI_应用程序);
如果(!RegisterClassEx(&wcex))
{
MessageBox(空,
_T(“调用RegisterClassEx失败!”),
_T(“CD-Rom阅读器应用程序”),
无效);
返回1;
}
//将实例句柄存储在全局变量中
hInst=hInstance;
//CreateWindow的参数解释如下:
//szWindowClass:应用程序的名称
//szTitle:出现在标题栏中的文本
//WS_OVERLAPPEDWINDOW:要创建的窗口类型
//CW_使用默认值,CW_使用默认值:初始位置(x,y)
//500、100:初始尺寸(宽度、长度)
//NULL:此窗口的父级
//NULL:此应用程序没有菜单栏
//hInstance:WinMain的第一个参数
//NULL:此应用程序中未使用
HWND HWND=CreateWindow(
szWindowClass,
szTitle,
WS_重叠窗口,
CW_USEDEFAULT,CW_USEDEFAULT,
1000, 500,
无效的
无效的
hInstance,
无效的
);
如果(!hWnd)
{
MessageBox(空,
_T(“调用CreateWindow失败!”),
_T(“CD-Rom阅读器应用程序”),
无效);
返回1;
}
//ShowWindow的参数解释如下:
//hWnd:从CreateWindow返回的值
//nCmdShow:WinMain的第四个参数
展示窗口(hWnd,
nCmdShow);
更新窗口(hWnd);
//主消息循环:
味精;
while(GetMessage(&msg,NULL,0,0))
{
翻译信息(&msg);
发送消息(&msg);
}
返回(int)msg.wParam;
}
//功能:WndProc(HWND、UINT、WPARAM、LPARAM)
//
//用途:处理主窗口的消息。
//
//WM_绘制-绘制主窗口
//WM_DESTROY-发布退出消息并返回
LRESULT回调WndProc(HWND HWND,UINT消息,WPARAM WPARAM,LPARAM LPARAM)
{
PAINTSTRUCT-ps;
HDC-HDC;
TCHAR问候语[]=\T(“你好,Windows桌面!”);
开关(信息)
{
案例WM_创建:
返回0;
case WM_命令:
{
开关(LOWORD(wParam))
{
机箱按钮:
HWND hwndButton=创建窗口(
L“BUTTON”,//预定义类;假定为Unicode
L“确定”,//按钮文本
WS|TABSTOP | WS|u VISIBLE | WS|u CHILD | BS|u def按钮,//样式
10,//x位置
10,//y位置
100,//按钮宽度
100,//按钮高度
hWnd,//父窗口
NULL,//没有菜单。
(HINSTANCE)GetWindowLongPtr(hWnd,GWLP_HINSTANCE),
NULL);//不需要指针。
//按下按钮后,在此处执行任何操作
打破
}
}
打破
案例WM_油漆:
hdc=开始喷漆(hWnd和ps);
//这是你的申请表。
//对于本介绍,我们只需打印“你好,Windows桌面!”
//在左上角。
文本输出(hdc,
5, 5,
问候语;
//结束特定于应用程序的布局部分。
端漆(hWnd和ps);
打破
案例WM_销毁:
PostQuitMessage(0);
打破
违约:
返回DefWindowProc(hWnd、message、wParam、lParam);
打破
}
返回0;
}
您应该在WM\u create
中(或在主功能中)创建一个按钮,并传递HMENU
参数,然后使用WM\u命令
处理按钮按下功能
您可以参考以下代码:
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
TCHAR greeting[] = _T("Hello, Windows desktop!");
switch (message)
{
case WM_CREATE:
{
HWND hwndButton = CreateWindow(
L"BUTTON", // Predefined class; Unicode assumed
L"OK", // Button text
WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, // Styles
10, // x position
10, // y position
100, // Button width
100, // Button height
hWnd, // Parent window
(HMENU)IDC_BUTTON, // No menu.
(HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE),
NULL); // Pointer not needed.
return 0;
}
case WM_COMMAND:
{
switch (LOWORD(wParam))
{
case IDC_BUTTON:
//do whatever you want to do here when button is pressed
//like
MessageBox(NULL,L"hello windows", L"title", 0);
}
}
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// Here your application is laid out.
// For this introduction, we just print out "Hello, Windows desktop!"
// in the top left corner.
TextOut(hdc,
5, 5,
greeting, _tcslen(greeting));
// End application-specific layout section.
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
return 0;
}
您将在何处(或如何)向主窗口发送IDC\u按钮
命令?代码仅在消息循环处理该消息时创建该按钮。