Question

在使用C ++编写的Windows应用程序中使用TreeView公共控件并使用Windows API（没有MFC或其他！）时遇到了一个奇怪的问题：只有加载了ComCtl32.dll的6.0版本时才会发送TVN_ITEMCHANGED和TVN_ITEMCHANGING（自Windows Vista以来可用）两个重要通知（通过清单说服链接器这样做） AND 如果Unicode字符集是采用。使用多字节字符集会导致上述两个通知消失。使用Unicode和版本5.82的ComCtl32.dll产生相同的结果。顺便说一句，我使用的是Windows 7 x64和Visual Studio 2010。

下面，您会找到一个＆＃34; minimal＆＃34; （＆gt; 180行代码：/）工作示例。使用Unicode字符集（配置属性＆gt;常规＆gt;字符集）在Visual Studio 2010下构建使程序按预期工作，但使用多字节字符集使TVN_ITEMCHANGED和TVN_ITEMCHANGING消失。无论如何其他通知都会到达。

我是否忽视了某些内容，或者我遇到了Common Controls实施中的错误？我真诚地希望这是我以前的猜测，我非常感谢你对此事的回答和想法！

祝你好运， D.费尔德曼

#include <Windows.h>
#include <CommCtrl.h>

#include <iostream>

#pragma comment(linker, "\"/manifestdependency:type='win32'\
    name='Microsoft.Windows.Common-Controls'\
    version='6.0.0.0'\
    processorArchitecture='*'\
    publicKeyToken='6595b64144ccf1df'\
    language='*'\"")

HINSTANCE g_hInst = 0;
HWND hwndTV_ = 0;

bool setupTreeView(HWND hwnd)
{
    RECT rc = {0};
    GetClientRect(hwnd, &rc);

    DWORD style = WS_CHILD | WS_VISIBLE | WS_OVERLAPPED | TVS_HASBUTTONS | TVS_HASLINES | TVS_LINESATROOT;
    hwndTV_ = CreateWindowEx(WS_EX_CLIENTEDGE, WC_TREEVIEW, 0, style,
        10, 10, (rc.right - rc.left) - 20, (rc.bottom - rc.top) - 20,
        hwnd, (HMENU) 0xDF, g_hInst, 0);

    if (! hwndTV_)
        return false;

    style |= TVS_CHECKBOXES;
    SetWindowLong(hwndTV_, GWL_STYLE, style);

    HIMAGELIST hil = ImageList_Create(24, 24, ILC_COLOR | ILC_COLOR32, 2, 0);
    const int img1 = ImageList_AddIcon(hil, LoadIcon(0, IDI_QUESTION));
    const int img2 = ImageList_AddIcon(hil, LoadIcon(0, IDI_INFORMATION));
    SendMessage(hwndTV_, TVM_SETIMAGELIST, TVSIL_NORMAL, (LPARAM) hil);

    TVINSERTSTRUCT tvis = {0};
    tvis.hParent =  TVI_ROOT;
    tvis.hInsertAfter = TVI_ROOT;
    tvis.item.mask = TVIF_TEXT | TVIF_STATE | TVIF_IMAGE | TVIF_SELECTEDIMAGE;
    tvis.item.cchTextMax = 5;
    tvis.item.pszText = TEXT("root\0");
    tvis.item.state = (2 << 12) | TVIS_EXPANDED;
    tvis.item.stateMask = TVIS_STATEIMAGEMASK | TVIS_EXPANDED;
    tvis.item.iImage = img1;
    tvis.item.iSelectedImage = img2;
    HTREEITEM hRoot = (HTREEITEM) SendMessage(hwndTV_, TVM_INSERTITEM, 0, (LPARAM) &tvis);

    tvis.hParent = hRoot;
    tvis.hInsertAfter = TVI_LAST;
    tvis.item.cchTextMax = 7;
    tvis.item.pszText = TEXT("item 1\0");
    SendMessage(hwndTV_, TVM_INSERTITEM, 0, (LPARAM) &tvis);

    tvis.item.pszText = TEXT("item 2\0");
    SendMessage(hwndTV_, TVM_INSERTITEM, 0, (LPARAM) &tvis);

    return true;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    LRESULT res = 0u;
    bool handled = true;
    switch (msg)
    {
        case WM_CLOSE:
            PostQuitMessage(0);
            break;

        case WM_CREATE:
            setupTreeView(hwnd);
            break;

        case WM_NOTIFY:
        {
            NMHDR* const nmhdr = (NMHDR*)lParam;
            switch (nmhdr->code)
            {
                case NM_CUSTOMDRAW:
                    std::cout << "NM_CUSTOMDRAW\n";
                    break;

                case NM_CLICK:
                    std::cout << "NM_CLICK\n";
                    break;

                case TVN_ITEMCHANGING:
                    std::cout << "!!! TVN_ITEMCHANGING !!!\n";
                    break;

                case TVN_ITEMCHANGED:
                    std::cout << "!!! TVN_ITEMCHANGED !!!\n";
                    break;

                case TVN_SELCHANGED:
                    std::cout << "TVN_SELCHANGED\n";
                    break;

                case TVN_SELCHANGING:
                    std::cout << "TVN_SELCHANGING\n";
                    break;

                case TVN_ITEMEXPANDED:
                    std::cout << "TVN_ITEMEXPANDED\n";
                    break;

                case TVN_ITEMEXPANDING:
                    std::cout << "TVN_ITEMEXPANDING\n";
                    break;

                default:
                    break;
            }   // switch (
            break;
        }

        default:
            handled = false;
            break;
    }   // switch (msg

    if (! handled)
        res = DefWindowProc(hwnd, msg, wParam, lParam);
    return res;
}

int run(HINSTANCE hInst)
{
    g_hInst = hInst;

    WNDCLASSEX wndCls = {0};
    wndCls.cbSize = sizeof(WNDCLASSEX);
    wndCls.cbClsExtra = 0;
    wndCls.cbWndExtra = 0;
    wndCls.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wndCls.hCursor = LoadCursor(0, IDC_HAND);
    wndCls.hIcon = LoadIcon(0, IDI_WINLOGO);
    wndCls.hIconSm = LoadIcon(0, IDI_WINLOGO);
    wndCls.hInstance = g_hInst;
    wndCls.lpfnWndProc = WindowProc;
    wndCls.lpszClassName = TEXT("TestWindowClass");
    wndCls.lpszMenuName = 0;
    wndCls.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
    RegisterClassEx(&wndCls);

    INITCOMMONCONTROLSEX cc = {0};
    cc.dwSize = sizeof(INITCOMMONCONTROLSEX);
    cc.dwICC = ICC_TREEVIEW_CLASSES;
    InitCommonControlsEx(&cc);

    HWND hwnd = CreateWindowEx(0, TEXT("TestWindowClass"), TEXT("Test TreeView"),
        WS_VISIBLE | WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION, CW_USEDEFAULT,
        CW_USEDEFAULT, 400, 300, NULL, NULL, hInst, 0);

    MSG msg = {0};
    for (BOOL res = TRUE; res != 0; )
    {
        res = GetMessage(&msg, 0, 0, 0);
        if (res != -1)
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        if (msg.message == WM_QUIT)
            res = 0;
    }

    HIMAGELIST hil = (HIMAGELIST) SendMessage(hwndTV_, TVM_GETIMAGELIST, (WPARAM) TVSIL_NORMAL, 0);
    if (hil)
        ImageList_Destroy(hil);

    UnregisterClass(TEXT("TestWindowClass"), g_hInst);

    return 0;
}

// Please build using /subsystem:console
int main(int /*argc*/, char** /*argv*/)
{
    return run(GetModuleHandle(0));
}

Answer 1

他们不会消失，你只是不在你的WindowProc()中寻找他们。与许多API一样，通知也可以具有Ansi和Unicode版本，但您只需要查找其中一个，具体取决于您是要编译MBCS还是Unicode。 Ansi TreeView可以接收Unicode通知，反之亦然。您应该查找通知的A和W版本并相应地处理它们：

switch (nmhdr->code)
{
    ...

    case TVN_ITEMCHANGINGA:
        std::cout << "!!! TVN_ITEMCHANGINGA !!!\n";
        break;

    case TVN_ITEMCHANGINGW:
        std::cout << "!!! TVN_ITEMCHANGINGW !!!\n";
        break;

    case TVN_ITEMCHANGEDA:
        std::cout << "!!! TVN_ITEMCHANGEDA !!!\n";
        break;

    case TVN_ITEMCHANGEDW:
        std::cout << "!!! TVN_ITEMCHANGEDA !!!\n";
        break;

    case TVN_SELCHANGEDA:
        std::cout << "TVN_SELCHANGEDA\n";
        break;

    case TVN_SELCHANGEDW:
        std::cout << "TVN_SELCHANGEDW\n";
        break;

    case TVN_SELCHANGINGA:
        std::cout << "TVN_SELCHANGINGA\n";
        break;

    case TVN_SELCHANGINGW:
        std::cout << "TVN_SELCHANGINGW\n";
        break;

    case TVN_ITEMEXPANDEDA:
        std::cout << "TVN_ITEMEXPANDEDA\n";
        break;

    case TVN_ITEMEXPANDEDW:
        std::cout << "TVN_ITEMEXPANDEDW\n";
        break;

    case TVN_ITEMEXPANDINGA:
        std::cout << "TVN_ITEMEXPANDINGA\n";
        break;

    case TVN_ITEMEXPANDINGW:
        std::cout << "TVN_ITEMEXPANDINGW\n";
        break;

    ...
}

Windows TreeView公共控件通知和多字节字符集的问题

1 个答案: