c - 我的子类化公共(public)控件工具提示是否会先于我在 WM_DESTROY 中自行销毁？

Question

下面的程序创建一个带有公共(public)控件工具提示的窗口，该工具提示对该窗口进行了子类化。当我收到 WM_DESTROY 时，我本能地决定销毁工具提示，因为 WM_DESTROY comes before child (and I assume owned as well) windows are destroyed ，但 DestroyWindow() 失败，返回最后一个错误 1400 (ERROR_INVALID_WINDOW_HANDLE)。 (在 wine 上，它返回 5 (ERROR_ACCESS_DENIED)。我假设这是 wine 的一个错误，要么错误地设置了最后一个错误，要么根本没有设置；我可以稍后提交一个。)

我已经在 Windows XP 32 位和 Windows 7 64 位上进行了测试，使用 Common Controls 5 和 6(下面使用了命令行“标志”)，并在 Ubuntu 14.10 和 15.04 beta 上使用 wine 进行了测试。

如果工具提示正在 self 破坏，我可以采取什么措施来处理它？我应该依赖这种行为吗？或者我应该对工具提示进行子类化并自己处理 WM_DESTROY 吗？ (两个窗口相互子类化会导致问题吗？)

谢谢。

// 31 march-2 april 2015
#define UNICODE
#define _UNICODE
#define STRICT
#define STRICT_TYPED_ITEMIDS
#define CINTERFACE
// get Windows version right; right now Windows XP
#define WINVER 0x0501
#define _WIN32_WINNT 0x0501
#define _WIN32_WINDOWS 0x0501       /* according to Microsoft's winperf.h */
#define _WIN32_IE 0x0600            /* according to Microsoft's sdkddkver.h */
#define NTDDI_VERSION 0x05010000    /* according to Microsoft's sdkddkver.h */
#include <windows.h>
#include <commctrl.h>
#include <windowsx.h>
#include <stdio.h>
#include <stdlib.h>

void die(char *why)
{
    fprintf(stderr, "error %s: %I32u\n", why, GetLastError());
    abort();
}

HWND tooltip = NULL;

LRESULT CALLBACK wndproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    CREATESTRUCT *cs = (CREATESTRUCT *) lParam;
    TOOLINFOW ti;

    switch (uMsg) {
    case WM_CREATE:
        tooltip = CreateWindowExW(WS_EX_TOOLWINDOW,
            TOOLTIPS_CLASSW, L"",
            WS_POPUP | TTS_NOPREFIX,
            0, 0,
            0, 0,
            hwnd, NULL, cs->hInstance, NULL);
        if (tooltip == NULL)
            die("creating tooltip");


        ZeroMemory(&ti, sizeof (TOOLINFOW));
        ti.cbSize = TTTOOLINFOW_V2_SIZE;
        ti.uFlags = TTF_IDISHWND | TTF_SUBCLASS | TTF_TRANSPARENT;
        ti.hwnd = hwnd;
        ti.uId = (UINT_PTR) hwnd;
        ti.hinst = cs->hInstance;
        ti.lpszText = L"this is a tooltip! wow!";
        if (SendMessageW(tooltip, TTM_ADDTOOL, 0, (LPARAM) (&ti)) == FALSE)
            die("setting up tooltip");

        break;
    case WM_CLOSE:
        PostQuitMessage(0);
        break;
    case WM_DESTROY:
        if (DestroyWindow(tooltip) == 0)
            die("deleting tooltips");
        break;
    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

void initCommonControls(BOOL);

int main(int argc, char *argv[])
{
    BOOL comctl5;
    WNDCLASSW wc;
    HWND mainwin;
    MSG msg;

    comctl5 = FALSE;
    if (argc > 1)
        comctl5 = strcmp(argv[1], "comctl5") == 0;
    initCommonControls(comctl5);

    ZeroMemory(&wc, sizeof (WNDCLASSW));
    wc.lpszClassName = L"mainwin";
    wc.lpfnWndProc = wndproc;
    wc.hIcon = LoadIconW(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursorW(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
    wc.hInstance = GetModuleHandle(NULL);
    if (RegisterClassW(&wc) == 0)
        die("registering main window class");

    mainwin = CreateWindowExW(0,
        L"mainwin", L"Main Window",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, GetModuleHandle(NULL), NULL);
    if (mainwin == NULL)
        die("creating main window");

    ShowWindow(mainwin, SW_SHOWDEFAULT);
    UpdateWindow(mainwin);

    while (GetMessage(&msg, NULL, 0, 0) > 0) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

// MSDN doesn't list a constant that only includes tooltips but says this and a few others do
#define wantedICCClasses (ICC_BAR_CLASSES)

static ULONG_PTR comctlManifestCookie;
static HMODULE comctl32;

// note that this is an 8-bit character string we're writing; see the encoding clause
static const char manifest[] = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n<assembly xmlns=\"urn:schemas-microsoft-com:asm.v1\" manifestVersion=\"1.0\">\n<assemblyIdentity\n    version=\"1.0.0.0\"\n    processorArchitecture=\"*\"\n    name=\"CompanyName.ProductName.YourApplication\"\n    type=\"win32\"\n/>\n<description>Your application description here.</description>\n<dependency>\n    <dependentAssembly>\n        <assemblyIdentity\n            type=\"win32\"\n            name=\"Microsoft.Windows.Common-Controls\"\n            version=\"6.0.0.0\"\n            processorArchitecture=\"*\"\n            publicKeyToken=\"6595b64144ccf1df\"\n            language=\"*\"\n        />\n    </dependentAssembly>\n</dependency>\n</assembly>\n";

void initCommonControls(BOOL comctl5)
{
    WCHAR temppath[MAX_PATH + 1];
    WCHAR filename[MAX_PATH + 1];
    HANDLE file;
    DWORD nExpected, nGot;
    ACTCTX actctx;
    HANDLE ac;
    INITCOMMONCONTROLSEX icc;
    FARPROC f;
    // this is listed as WINAPI in both Microsoft's and MinGW's headers, but not on MSDN for some reason
    BOOL (*WINAPI ficc)(const LPINITCOMMONCONTROLSEX);

    if (!comctl5) {
        if (GetTempPathW(MAX_PATH + 1, temppath) == 0)
            die("getting temporary path for writing manifest file");
        if (GetTempFileNameW(temppath, L"manifest", 0, filename) == 0)
            die("getting temporary filename for writing manifest file");
        file = CreateFileW(filename, GENERIC_WRITE,
            0,          // don't share while writing
            NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
        if (file == NULL)
            die("creating manifest file");
        nExpected = (sizeof manifest / sizeof manifest[0]) - 1;     // - 1 to omit the terminating null character)
        if (WriteFile(file, manifest, nExpected, &nGot, NULL) == 0)
            die("writing manifest file");
        if (nGot != nExpected)
            die("short write to manifest file");
        if (CloseHandle(file) == 0)
            die("closing manifest file (this IS an error here because not doing so will prevent Windows from being able to use the manifest file in an activation context)");

        ZeroMemory(&actctx, sizeof (ACTCTX));
        actctx.cbSize = sizeof (ACTCTX);
        actctx.dwFlags = ACTCTX_FLAG_SET_PROCESS_DEFAULT;
        actctx.lpSource = filename;
        ac = CreateActCtx(&actctx);
        if (ac == INVALID_HANDLE_VALUE)
            die("creating activation context for synthesized manifest file");
        if (ActivateActCtx(ac, &comctlManifestCookie) == FALSE)
            die("activating activation context for synthesized manifest file");
    }

    ZeroMemory(&icc, sizeof (INITCOMMONCONTROLSEX));
    icc.dwSize = sizeof (INITCOMMONCONTROLSEX);
    icc.dwICC = wantedICCClasses;

    comctl32 = LoadLibraryW(L"comctl32.dll");
    if (comctl32 == NULL)
        die("loading comctl32.dll");
    f = GetProcAddress(comctl32, "InitCommonControlsEx");
    if (f == NULL)
        die("loading InitCommonControlsEx()");
    ficc = (BOOL (*WINAPI)(const LPINITCOMMONCONTROLSEX)) f;
    if ((*ficc)(&icc) == FALSE)
        die("initializing Common Controls (comctl32.dll)");
}

Answer 1

工具提示没有 WS_CHILD 样式。所有此类窗口在所有者窗口收到 WM_DESTROY 之前就被完全销毁。结果 DestroyWindow(tooltip) 并返回错误 - ERROR_INVALID_WINDOW_HANDLE