帮我用c++写一个获取所有窗口id

#include <Windows.h>

int main() {
HWND hwnd = GetTopWindow(NULL);
while (hwnd) {
char title[256];
GetWindowText(hwnd, title, sizeof(title));
if (IsWindowVisible(hwnd)) {
printf("Window ID: %d, Title: %s\n", (int)hwnd, title);
}
hwnd = GetNextWindow(hwnd, GW_HWNDNEXT);
}
return ;
}

相关问题

用C++写一个windows记事本

好的，首先你需要开启一个新的项目，然后在项目中创建一个新的文本文件，保存文件名为“记事本.c”。接下来，你需要在代码中添加所需的库文件，如下所示：

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

然后，你需要定义一些常量，如下所示：

#define IDM_NEW 1
#define IDM_OPEN 2
#define IDM_SAVE 3

在主函数中，你需要设置窗口的大小和标题，如下所示：

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow) {
HWND hWnd;
MSG msg;
WNDCLASS wc;

// 设置窗口类
wc.style = CS_HREDRAW | CS_VREDRAW;
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 = "记事本";

// 注册窗口类
RegisterClass(&wc);

// 创建窗口
hWnd = CreateWindow(
"记事本",
"记事本",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);

// 显示窗口
ShowWindow(hWnd, nCmdShow);

// 进入消息循环
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return (int)msg.wParam;
}

在窗口过程函数中，你需要处理菜单命令、文本编辑和文件保存等功能，如下所示：

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
static HWND hEdit;
static char szFileName[MAX_PATH];

switch (message) {
case WM_CREATE:
// 创建编辑框
hEdit = CreateWindow(
"EDIT",
"",
WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL |
ES_LEFT | ES_MULTILINE | ES_AUTOHSCROLL | ES_AUTOVSCROLL,
0, 0, 0, 0,
hWnd,
(HMENU)ID_EDIT,
((LPCREATESTRUCT)lParam)->hInstance,
NULL);

// 设置菜单
{
HMENU hMenu, hSubMenu;

hMenu = CreateMenu();

hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu, MF_STRING, IDM_NEW, "新建(&N)");
AppendMenu(hSubMenu, MF_STRING, IDM_OPEN, "打开(&O)");
AppendMenu(hSubMenu, MF_STRING, IDM_SAVE, "保存(&S)");
AppendMenu(hMenu, MF_POPUP, (UINT_PTR)hSubMenu, "文件(&F)");

SetMenu(hWnd, hMenu);
}
break;
case WM_SIZE:
// 调整编辑框大小
MoveWindow(hEdit, 0, 0, LOWORD(lParam), HIWORD(lParam), TRUE);
break;
case WM_COMMAND:
// 处理菜单命令
switch (LOWORD(wParam)) {
case IDM_NEW:
SendMessage(hEdit, WM_SETTEXT, 0, (LPARAM)"");
*szFileName = '\0';
break;
case IDM_OPEN:
{
OPENFILENAME ofn;

ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hWnd;
ofn.lpstrFilter = "文本文件(*.txt)\0*.txt\0所有文件(*.*)\0*.*\0";
ofn.lpstrFile = szFileName;
ofn.nMaxFile = MAX_PATH;
ofn.lpstrTitle = "打开";
ofn.Flags = OFN_FILEMUSTEXIST;

if (GetOpenFileName(&ofn)) {
HANDLE hFile;
DWORD dwSize, dwRead;

hFile = CreateFile(szFileName, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE) {
MessageBox(hWnd, "无法打开文件", "错误", MB_ICONERROR);
break;
}

dwSize = GetFileSize(hFile, NULL);
if (dwSize == INVALID_FILE_SIZE) {
MessageBox(hWnd, "无法获取文件大小", "错误", MB_ICONERROR);
CloseHandle(hFile);
break;
}

char* pText = (char*)malloc(dwSize + 1);
if (!pText) {
MessageBox(hWnd, "内存不足", "错误", MB_ICONERROR);
CloseHandle(hFile);
break;
}

if (!ReadFile(hFile, pText, dwSize, &dwRead, NULL)) {
MessageBox(hWnd, "无法读取文件", "错误", MB_ICONERROR);
free(pText);
CloseHandle(hFile);
break;
}

pText[dwSize] = '\0';
SendMessage(hEdit, WM_SETTEXT, 0, (LPARAM)pText);
free(pText);

CloseHandle(hFile);
}
}
break;
case IDM_SAVE:
{
OPENFILENAME ofn;

ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hWnd;
ofn.lpstrFilter = "文本文件(*.txt)\0*.txt\0所有文件(*.*)\0*.*\0";
ofn.lpstrFile = szFileName;
ofn.nMaxFile = MAX_PATH;
ofn.lpstrTitle = "保存";
ofn.Flags = OFN_OVERWRITEPROMPT;

if (GetSaveFileName(&ofn)) {
HANDLE hFile;
DWORD dwSize, dwWritten;

hFile = CreateFile(szFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE) {
MessageBox(hWnd, "无法创建文件", "错误", MB_ICONERROR);
break;
}

dwSize = GetWindowTextLength(hEdit);
if (dwSize == 0) {
MessageBox(hWnd, "没有内容需要保存", "提示", MB_ICONINFORMATION);
CloseHandle(hFile);
break;
}

char* pText = (char*)malloc(dwSize + 1);
if (!pText) {
MessageBox(hWnd, "内存不足", "错误", MB_ICONERROR);
CloseHandle(hFile);
break;
}

if (!GetWindowText(hEdit, pText, dwSize + 1)) {
MessageBox(hWnd, "无法获取文本内容", "错误", MB_ICONERROR);
free(pText);
CloseHandle(hFile);
break;
}

if (!WriteFile(hFile, pText, dwSize, &dwWritten, NULL)) {
MessageBox(hWnd, "无法保存数据", "错误", MB_ICONERROR);
free(pText);
CloseHandle(hFile);
break;
}

free(pText);

CloseHandle(hFile);
}
}
break;
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}

return 0;
}

这样就完成了一个简单的 Windows 记事本程序的开发。

C++中怎样在窗口中设置一个计时器

在C++中，您可以使用Windows API中的SetTimer()函数来设置一个计时器。以下是一个简单的示例程序，它使用SetTimer()函数在窗口中设置了一个计时器：

#include <windows.h>

// 定义计时器ID
#define TIMER_ID 1

// 定义计时器时间间隔（毫秒）
#define TIMER_INTERVAL 1000

// 窗口过程函数
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
        // 在窗口创建时设置计时器
        SetTimer(hWnd, TIMER_ID, TIMER_INTERVAL, NULL);
        break;
    case WM_TIMER:
        // 计时器消息处理代码
        // TODO: 在这里编写计时器处理代码
        break;
    case WM_DESTROY:
        // 在窗口销毁时清除计时器
        KillTimer(hWnd, TIMER_ID);
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// WinMain函数
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 注册窗口类
    WNDCLASS wc = {0};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "MyWindowClass";
    RegisterClass(&wc);

    // 创建窗口
    HWND hWnd = CreateWindow("MyWindowClass", "My Window", WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, NULL, NULL, hInstance, NULL);

    // 显示窗口
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

在这个示例程序中，我们在窗口创建时使用SetTimer()函数设置了一个计时器，计时器的ID为1，时间间隔为1秒。在窗口消息循环中，我们使用GetMessage()函数获取消息，如果收到计时器消息，就在WM_TIMER分支中编写计时器处理代码。

需要注意的是，在窗口销毁时，我们需要使用KillTimer()函数清除计时器，以免内存泄漏。