c++ - 添加编辑窗口后,win32 GUI 无法正确加载
问题描述
当我在 Visual Studio 中构建程序时,它需要很长时间才能构建并且无法正确显示,在此过程中,它会在控制台中加载和卸载许多看似 dll 文件的内容。如果我删除以程序开头的一行CreateWindowW(L"EDIT"
将完美运行。我已经阅读了文档,但我找不到它有什么问题。任何帮助表示赞赏。
这是完整的代码
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include<iostream>
#define file_menu_new 1
#define help_menu 2
#define file_menu_open 3
#define file_menu_exit 4
void AddMenus(HWND hwind);
HMENU hMenu;
void AddControls(HWND hwnd);
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance,_In_ PSTR szCmdLine, _In_ int iCmdShow)
{
// 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;
//regesters class above with operateing system
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 | WS_VISIBLE, // Window style
// Size and position
500, 200, 800, 500,//WS_DEFAULT OR SOMETHING LIKE THAT
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, iCmdShow);
// 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_COMMAND:
{
switch (wParam)
{
case file_menu_new:
MessageBeep(MB_OK);//this creates a sound
break;
case file_menu_exit:
DestroyWindow(hwnd);
break;
case file_menu_open:
MessageBeep(MB_ICONINFORMATION);
default:
break;
}
}
case WM_CREATE:
{
AddControls(hwnd);
AddMenus(hwnd);
break;
}
case WM_DESTROY:
{
PostQuitMessage(0);
break;
}
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));
EndPaint(hwnd, &ps);
break;
}
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
void AddMenus(HWND hwind)
{
hMenu = CreateMenu();//main menu bar
HMENU hFileMenu = CreateMenu();//this is a drop down menu for the file part of main menu
//AppendMenu(hMenu, MF_STRING, 1, L"File");//1 is the identity of this main menu
AppendMenu(hMenu, MF_POPUP, (UINT_PTR)hFileMenu, L"File");//this is how you make it pop up another menu
AppendMenu(hFileMenu, MF_STRING, file_menu_new, L"New");//adds stuff to hFileMenu with the id of 1
AppendMenu(hFileMenu, MF_STRING, file_menu_open, L"Open");//adds stuff to hFileMenu with the id of 3
AppendMenu(hFileMenu, IMFT_SEPARATOR, NULL, NULL);//creates a seperator or a line under open
AppendMenu(hFileMenu, MF_STRING, file_menu_exit, L"Exit");
AppendMenu(hMenu, MF_STRING, help_menu, L"Help");//2 is the identity of this main menu
//sets the hMenu to the hwind menu or the main menu
SetMenu(hwind, hMenu);
}
void AddControls(HWND hwnd)
{
CreateWindowW(L"static", L"Enter Text here: ", WS_VISIBLE | WS_CHILD | WS_BORDER | SS_CENTER | WS_EX_TRANSPARENT,
200, 100, 100, 50, hwnd, NULL, NULL, NULL);
CreateWindowW(L"EDIT", L"Enter Text here: ", WS_VISIBLE | WS_CHILD | WS_BORDER | SS_CENTER,
200, 160, 100, 50, hwnd, NULL, NULL, NULL);
}
解决方案
添加wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
和删除WM_PAINT
. 如果您没有设置类背景,则需要处理WM_ERASEBKGND
或以其他方式验证背景颜色绘制。
推荐阅读
- reactjs - GithubPages 的问题
- python - 如何将函数输出转储到 .txt 文件?
- python - Djago rest 框架 - 尝试更新用户信息时用户名/电子邮件已经存在
- python - 运行 Dataflow 管道时出现 Apache Beam 2.31 弃用警告
- javascript - React Testing Library with Redux - 在动作创建者中模拟 Axios
- components - Reactstrap Card 组件无法正常工作
- javascript - 带有打开按钮的 DOM 操作模式窗口错误
- go - 如何向 map[string]interface{} 添加新值
- java - 使用名称 TABHIBERNATE_SEQUENCES 生成 HIBERNATE_SEQUENCES 表
- sql - 在通常的 FROM 子句中添加 JOINS