jrfdsa's questions

使用open62541编写的服务器，为什么只能通过localhost访问？

我尝试像这样添加服务器网址

UA_String serverUrls[2];
size_t serverUrlsSize = 0;

UA_String_clear(config.serverUrls);

serverUrls[serverUrlsSize] = UA_STRING("opc.tcp://:48440");
serverUrlsSize++;
serverUrls[serverUrlsSize] = UA_STRING("opc.tcp://192.9.200.93:48440");
serverUrlsSize++;

retval = UA_Array_copy(serverUrls, serverUrlsSize,
        (void**)&config.serverUrls, &UA_TYPES[UA_TYPES_STRING]);
if (retval != UA_STATUSCODE_GOOD)
{
    return retval;
}
config.serverUrlsSize = serverUrlsSize;

但没有任何帮助，所以我需要一个 lds 服务器来进行外部访问？

PS它不允许你创建标签，但是没有opcua和open62541标签

ListView_SortItemsEx之后ListView_FindItem总是返回-1，即没有找到任何东西。告诉我为什么会有这种行为？最小可重复示例

#include "windows.h"
#include "commctrl.h"
#include "vector"
#include "string"
#pragma comment(lib, "Comctl32.lib")

HINSTANCE hinst;
HWND hwndMain;
HWND hwndList;

LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);

int CreateColumn(HWND hwndLV, int iCol, CHAR* Text, int iWidth)
{
    LVCOLUMN lvc;

    lvc.mask = LVCF_FMT | LVCF_WIDTH | LVCF_TEXT | LVCF_SUBITEM;
    lvc.fmt = LVCFMT_LEFT;
    lvc.cx = iWidth;
    lvc.pszText = Text;
    lvc.iSubItem = iCol;
    return ListView_InsertColumn(hwndLV, iCol, &lvc);
}

int CreateItem(HWND hwndList, CHAR* text, int index)
{
    LVITEM lvi = { 0 };
    int res;

    lvi.mask = LVIF_TEXT | LVIF_PARAM | LVIF_IMAGE;
    lvi.iItem = index;
    lvi.pszText = text;
    lvi.lParam = 0;
    res = ListView_InsertItem(hwndList, &lvi);

    if (res >= 0)
    {
        ListView_SetItemText(hwndList, res, 0, text);
    }

    return res;
}

void fillListView()
{
    for (int i = 0; i < 10; ++i)
    {
        CreateItem(hwndList, (CHAR*)std::to_string(i).c_str(), i);
    }
}

// функция обратново вызова для сортировки
int CALLBACK CompareListViewFunc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
{
    std::vector<CHAR> str1(MAX_PATH);
    std::vector<CHAR> str2(MAX_PATH);

    ListView_GetItemText(hwndList, lParam1, 0, &str1.front(), MAX_PATH);
    ListView_GetItemText(hwndList, lParam2, 0, &str2.front(), MAX_PATH);

    if (strcmp(&str1.front(), &str2.front()) == 0)
    {
        return NULL;
    }

    if (strcmp(&str1.front(), &str2.front()) == 1)
    {
        return TRUE;
    }

    return -1;
}

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpszCmdLine, int nCmdShow)
{
    MSG msg;
    BOOL bRet;
    WNDCLASS wc;
    UNREFERENCED_PARAMETER(lpszCmdLine);

    // Register the window class for the main window. 

    if (!hPrevInstance)
    {
        wc.style = 0;
        wc.lpfnWndProc = (WNDPROC)WndProc;
        wc.cbClsExtra = 0;
        wc.cbWndExtra = 0;
        wc.hInstance = hInstance;
        wc.hIcon = LoadIcon((HINSTANCE)NULL,
            IDI_APPLICATION);
        wc.hCursor = LoadCursor((HINSTANCE)NULL,
            IDC_ARROW);
        wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
        wc.lpszMenuName = "MainMenu";
        wc.lpszClassName = "MainWndClass";

        if (!RegisterClass(&wc))
            return FALSE;
    }

    hinst = hInstance;  

    hwndMain = CreateWindow("MainWndClass", "Sample",
        WS_OVERLAPPEDWINDOW, 500, 30, 700, 700, (HWND)NULL,
        (HMENU)NULL, hinst, (LPVOID)NULL);

    hwndList = CreateWindow(WC_LISTVIEW, "", WS_VISIBLE | WS_BORDER | WS_CHILD | LVS_REPORT |
        LVS_NOCOLUMNHEADER | LVS_SORTDESCENDING, 5, 5, 470, 630, hwndMain, (HMENU)44444, 0, 0);

    HWND btn = CreateWindow("Button", "Select element 2", WS_CHILD | BS_PUSHBUTTON | WS_VISIBLE, 500, 5, 150, 30, hwndMain, (HMENU)44445, 0, 0);

    HWND btn2 = CreateWindow("Button", "Sorting", WS_CHILD | BS_PUSHBUTTON | WS_VISIBLE, 500, 55, 150, 30, hwndMain, (HMENU)44446, 0, 0);

    ListView_SetExtendedListViewStyleEx(hwndList, 0, LVS_EX_FULLROWSELECT | LVS_EX_FLATSB);

    CreateColumn(hwndList, 1, 0, 450);

    fillListView();


    if (!hwndMain)
        return FALSE;

    ShowWindow(hwndMain, nCmdShow);
    UpdateWindow(hwndMain);

    while ((bRet = GetMessage(&msg, NULL, 0, 0)) != 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {

    case WM_COMMAND:
    {
        int wmId = LOWORD(wParam);
        switch (wmId)
        {
        case 44445:
        {
            LVFINDINFO lvfiInfo;
            lvfiInfo.flags = LVFI_STRING;
            lvfiInfo.psz = "2";
            int iIndex = ListView_FindItem(hwndList, -1, &lvfiInfo);
            if (iIndex != -1)
            {
                ListView_SetItemState(hwndList, iIndex, LVIS_SELECTED, LVIS_SELECTED);
                SetFocus(hwndList);
            }
            else
            {
                MessageBox(hWnd, "Not found", "ERROR", MB_ICONINFORMATION);
            }

            break;
        }
        case 44446:
        {
            ListView_SortItemsEx(hwndList, CompareListViewFunc, 0);

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

任务是在窗口淡入背景时将其最小化。我想过捕捉移动到后台的消息并将其最小化，但我没有找到这样的消息。也许还有其他选择？谢谢。

如何逐步将文本添加到小部件？例子：

from tkinter import tk
import time

root = tk.Tk()

label = tk.Label(root, text='Stroka 1')
label.grid()
time.sleep(1)

label = tk.Label(root, text='Stroka 2')
label.grid()
time.sleep(1)

root.mainloop()

我知道它实际上每秒都会添加行，但它只在到达 root.mainloop() 时显示。请告诉我如何实施。