c++winapi无法创建2个控件

Question

我正在尝试创建包含richedit控件和listbox控件的窗口，问题是我创建的第二个控件没有出现。我的意思是：

case WM_CREATE: // In main window procedure
{
    /* Center the main window */
    This->CenterWindow(hwnd);
    /* Initialize the clients list */
    This->InitListClients(hwnd);
    /* Initialize the server log */
    This->InitEditLog(hwnd);
    return 0;
}

如果InitListClients函数将首先出现，则只显示列表框，如果InitEditLog将是第一个，则只显示richedit。

以下是功能：

void ApostleServer::InitEditLog(HWND &_hwnd)
{
    LoadLibrary(TEXT("Riched32.dll"));
    hEditLog = CreateWindowEx(WS_EX_STATICEDGE, "richedit", "bla", WS_CHILD | WS_VISIBLE | ES_MULTILINE, 10, 10, 390, 310, _hwnd, NULL, (HINSTANCE)GetWindowLong(_hwnd, GWL_HINSTANCE), NULL);
}
void ApostleServer::InitListClients(HWND &_hwnd)
{
    hListClients = CreateWindowEx(WS_EX_STATICEDGE, "listbox", "bla", WS_CHILD | WS_VISIBLE | LBS_NOTIFY, 550, 20, 150, 150, _hwnd, NULL, (HINSTANCE)GetWindowLong(_hwnd, GWL_HINSTANCE), NULL);
}

我是winapi的新手，我找不到这个问题的解决方案。谢谢

编辑：正如我所评论的，问题的原因是使用了类成员。这是我写的一整段代码，也有同样的问题：

#include <Windows.h>
#include <stdlib.h>
class Server
{
public:
    /* Fields */
    MSG* msg;
    WNDCLASSW* wc;
    HWND hListClients;
    HWND hEditLog;
    /* Methods */
    void InitEditLog(HWND &_hwnd)
    {
        LoadLibrary(TEXT("Riched32.dll"));
        hEditLog = CreateWindowExW(WS_EX_STATICEDGE, L"richedit", L"Text", WS_CHILD | WS_VISIBLE | ES_MULTILINE, 10, 10, 390, 306, _hwnd, (HMENU)2, (HINSTANCE)GetWindowLong(_hwnd, GWL_HINSTANCE), NULL);
    }
    void InitListClients(HWND &_hwnd)
    {
        // Here I'm using hListClients class member, and that what cause the problem (I will see only the list on the window)
        hListClients = CreateWindowExW(WS_EX_STATICEDGE, L"listbox", L"asd", WS_CHILD | WS_VISIBLE | LBS_NOTIFY, 410, 10, 160, 306, _hwnd, (HMENU)1, (HINSTANCE)GetWindowLong(_hwnd, GWL_HINSTANCE), NULL);
        // If I was only creating the listbox (without returning handler), I will see the listbox and the richedit.
    }
    static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
    {
        Server* This = (Server*)GetWindowLongW(hwnd, GWL_USERDATA);
        switch(msg)
        {
            case WM_CREATE:
            {
                /* Initialize the clients list */
                This->InitListClients(hwnd); // Attention that I called this function first.
                /* Initialize the server log */
                This->InitEditLog(hwnd);
                // If I would call this function first, I will see only the richedit.
                return 0;
            }
            case WM_DESTROY:
            {
                PostQuitMessage(0);
                return 0;
            }
        }
        return DefWindowProcW(hwnd, msg, wParam, lParam);
    }
    Server(HINSTANCE &_hInstance)
    {
        msg = new MSG;
        wc = new WNDCLASSW;
        wc->style = CS_HREDRAW | CS_VREDRAW;
        wc->cbClsExtra = 0;
        wc->cbWndExtra = 0;
        wc->lpszClassName = L"ApostleServer";
        wc->hInstance = _hInstance;
        wc->hbrBackground = GetSysColorBrush(COLOR_3DFACE);
        wc->lpszMenuName = NULL;
        wc->lpfnWndProc = WndProc;
        wc->hCursor = LoadCursor(NULL, IDC_ARROW);
        wc->hIcon = LoadIcon(NULL, IDI_APPLICATION);
        RegisterClassW(&(*wc));
        CreateWindowW(wc->lpszClassName, L"Apostle Server", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 600, 400, 0, 0, _hInstance, 0);
        while(GetMessage(&(*msg), NULL, 0, 0))
        {
            TranslateMessage(&(*msg));
            DispatchMessage(&(*msg));
        }
    }
};
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
    Server* srvr = new Server(hInstance);
    return 0;
}

Answer 1

通过在WM_CREATE消息上创建控件（但不设置控件处理程序。

WM_CREATE消息：

    case WM_CREATE:
    {
        /* Center the main window */
        This->CenterWindow(hwnd);
        /* Initialize the clients list */
        This->InitListClients(hwnd);
        /* Initialize the server log */
        This->InitEditLog(hwnd);

        return 0;
    }

主窗口创建后：

RegisterClassW(&(*wc));
hMainWindow = CreateWindowW(wc->lpszClassName, L"Apostle Server", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 600, 400, 0, 0, _hInstance, 0);
/* Set controls handlers */
hListClients = GetDlgItem(hMainWindow, IDC_LISTCLIENTS);
hEditLog = GetDlgItem(hMainWindow, IDC_EDITLOG);

InitEditLog和InitListClients的功能：

void ApostleServer::InitEditLog(HWND &_hwnd)
{
    LoadLibrary(TEXT("Riched32.dll"));
    CreateWindowExW(WS_EX_STATICEDGE, L"richedit", L"Text", WS_CHILD | WS_VISIBLE | ES_MULTILINE, 10, 10, 390, 306, _hwnd, (HMENU)IDC_EDITLOG, (HINSTANCE)GetWindowLong(_hwnd, GWL_HINSTANCE), NULL);
}
void ApostleServer::InitListClients(HWND &_hwnd)
{
    CreateWindowExW(WS_EX_STATICEDGE, L"listbox", L"asd", WS_CHILD | WS_VISIBLE | LBS_NOTIFY, 410, 10, 160, 306, _hwnd, (HMENU)IDC_LISTCLIENTS, (HINSTANCE)GetWindowLong(_hwnd, GWL_HINSTANCE), NULL);
}