安装扩展cmake tools
c/c++
c/c++ Extension pack

CMakeLists.txt

cmake_minimum_required(VERSION 3.20)
project(NotepadApp)set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)# Windows specific settings
if(WIN32)set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
endif()# Include Windows SDK
if(WIN32)include_directories($ENV{WindowsSdkDir}Include/10.0.26100.0/um)include_directories($ENV{WindowsSdkDir}Include/10.0.26100.0/shared)link_directories($ENV{WindowsSdkDir}Lib/10.0.26100.0/um/x64)
endif()# Add executable
add_executable(NotepadApp WIN32 src/main.cpp)# Windows specific libraries
if(WIN32)target_link_libraries(NotepadAppComctl32.libComdlg32.libGdi32.libUser32.libShell32.lib)
endif()

src/main.cpp

#include <windows.h>
#include <commdlg.h> // 用于打开文件对话框const char g_szClassName[] = "notepadWindowClass";// 保存文件函数
void SaveFile(HWND hwnd) {HWND hEdit = GetWindow(hwnd, GW_CHILD);int len = GetWindowTextLength(hEdit) + 1;char* text = new char[len];GetWindowText(hEdit, text, len);OPENFILENAME ofn;char szFileName[MAX_PATH] = "";ZeroMemory(&ofn, sizeof(ofn));ofn.lStructSize = sizeof(ofn);ofn.hwndOwner = hwnd;ofn.lpstrFilter = "Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0";ofn.lpstrFile = szFileName;ofn.nMaxFile = MAX_PATH;ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;ofn.lpstrDefExt = "txt";if (GetSaveFileName(&ofn)) {HANDLE hFile = CreateFile(ofn.lpstrFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);if (hFile != INVALID_HANDLE_VALUE) {DWORD dwBytesWritten;WriteFile(hFile, text, len - 1, &dwBytesWritten, NULL);CloseHandle(hFile);}}delete[] text;
}// 打开文件函数
void OpenFile(HWND hwnd) {HWND hEdit = GetWindow(hwnd, GW_CHILD);OPENFILENAMEW ofn;wchar_t szFileName[MAX_PATH] = L"";ZeroMemory(&ofn, sizeof(ofn));ofn.lStructSize = sizeof(ofn);ofn.hwndOwner = hwnd;ofn.lpstrFilter = L"Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0";ofn.lpstrFile = szFileName;ofn.nMaxFile = MAX_PATH;ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;ofn.lpstrDefExt = L"txt";if (GetOpenFileNameW(&ofn)) {HANDLE hFile = CreateFileW(ofn.lpstrFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);if (hFile != INVALID_HANDLE_VALUE) {DWORD dwFileSize = GetFileSize(hFile, NULL);char* text = new char[dwFileSize + 1];DWORD dwBytesRead;ReadFile(hFile, text, dwFileSize, &dwBytesRead, NULL);text[dwFileSize] = '\0'; // 添加字符串结束符// 将UTF-8转换为宽字符int wideLen = MultiByteToWideChar(CP_UTF8, 0, text, -1, NULL, 0);wchar_t* wideText = new wchar_t[wideLen];MultiByteToWideChar(CP_UTF8, 0, text, -1, wideText, wideLen);SetWindowTextW(hEdit, wideText);CloseHandle(hFile);delete[] text;delete[] wideText;}}
}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{switch(msg){case WM_CREATE: {// 创建字体HFONT hFont = CreateFont(16, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE,DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE,"微软雅黑");// 创建编辑框HWND hEdit = CreateWindow("EDIT", "", WS_VISIBLE | WS_CHILD | WS_BORDER | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,0, 0, 100, 100, hwnd, NULL, NULL, NULL);// 设置字体SendMessage(hEdit, WM_SETFONT, (WPARAM)hFont, TRUE);// 创建菜单栏HMENU hMenu = CreateMenu();HMENU hFileMenu = CreatePopupMenu();AppendMenu(hFileMenu, MF_STRING, 1, "Open");AppendMenu(hFileMenu, MF_STRING, 2, "Save");AppendMenu(hMenu, MF_POPUP, (UINT_PTR)hFileMenu, "File");SetMenu(hwnd, hMenu); // 将菜单栏附加到窗口break;}case WM_COMMAND: {switch (LOWORD(wParam)) {case 1: // OpenOpenFile(hwnd);break;case 2: // SaveSaveFile(hwnd);break;}break;}case WM_SIZE: {HWND hEdit = GetWindow(hwnd, GW_CHILD);SetWindowPos(hEdit, NULL, 0, 0, LOWORD(lParam), HIWORD(lParam), SWP_NOZORDER);break;}case WM_CLOSE:DestroyWindow(hwnd);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd, msg, wParam, lParam);}return 0;
}int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{WNDCLASSEX wc;HWND hwnd;MSG Msg;wc.cbSize        = sizeof(WNDCLASSEX);wc.style         = 0;wc.lpfnWndProc   = WndProc;wc.cbClsExtra    = 0;wc.cbWndExtra    = 0;wc.hInstance     = hInstance;wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);wc.hCursor       = LoadCursor(NULL, IDC_ARROW);wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);wc.lpszMenuName  = NULL;wc.lpszClassName = g_szClassName;wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);if(!RegisterClassEx(&wc)){MessageBox(NULL, "Window Registration Failed!", "Error!",MB_ICONEXCLAMATION | MB_OK);return 0;}hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,g_szClassName,"Notepad",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, 800, 600,NULL, NULL, hInstance, NULL);if(hwnd == NULL){MessageBox(NULL, "Window Creation Failed!", "Error!",MB_ICONEXCLAMATION | MB_OK);return 0;}ShowWindow(hwnd, nCmdShow);UpdateWindow(hwnd);while(GetMessage(&Msg, NULL, 0, 0) > 0){TranslateMessage(&Msg);DispatchMessage(&Msg);}return Msg.wParam;
}

终端命令
1

cd build; cmake .. -G "Visual Studio 17 2022" -A x64 

2

cmake --build . --clean-first --config Release  

3

 bin/Release/NotepadApp.exe