Win32：更多"object oriented"窗口消息处理系统

在Win32 API中，一个窗口有一个指针，指向一个用户定义的WndProc函数的版本，用来处理它的消息。

有一些方法可以用MFC消息映射等解决方案来覆盖这种低级机制。

在我的小应用程序中，我正在寻找一种方法来封装这个低级的东西与面向对象的解决方案。

我试图用HWND键和"MyWindowClass"项目创建一个c++地图，当我创建MyClass的对象时，我向地图添加了一对，然后通过HWN寻找MyWindowClass对象。但是问题是在CreateWindowEx调用Win32内部发送WM_CREATE消息到刚刚创建的窗口之后，所以我不能在此消息之前在映射中添加pair，也不能通过将其传递给实例化的WndProc对象来控制WM_CREATE。

代码是:

#ifndef NOTIFYWINDOW_H
#define NOTIFYWINDOW_H
#include "Bacn.h"
class NotifyWindow
{
private:
    HWND m_hWnd;
    Gdiplus::Graphics* m_graphics;
protected:
    static std::map<HWND, NotifyWindow*> s_NotifyWindows;
    static LRESULT CALLBACK s_WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
    static void s_WndMessageLoop();
    LRESULT WndProc(UINT uMsg, WPARAM wParam, LPARAM lParam);
    void Initialize();
    void OnPaint();
    void OnCreate();
public: 
    NotifyWindow();
    ~NotifyWindow();
};
#endif //NOTIFYWINDOW_H

及其实现:

#include "NotifyWindow.h"
using namespace Gdiplus;
using namespace std;
map<HWND*, NotifyWindow> NotifyWindow::s_NotifyWindows;
LRESULT CALLBACK NotifyWindow::s_WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    map<HWND, NotifyWindow*>::iterator search = s_NotifyWindows.find(hWnd);
    if (search != s_NotifyWindows.end())
    {
        search->second->WndProc(uMsg, wParam, lParam);
    }
    return DefWindowProc(hWnd, uMsg, wParam, lParam);   
}
void NotifyWindow::s_WndMessageLoop()
{
}
LRESULT NotifyWindow::WndProc(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_CREATE:
        OnCreate();
        break;
    case WM_PAINT:
        OnPaint();
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    case WM_SIZE:
        break;
    case WM_SETFOCUS:
        break;
    case WM_KILLFOCUS:
        break;
    case WM_MOUSEMOVE:
        break;
    default:
        return DefWindowProc(m_hWnd, uMsg, wParam, lParam);
    }
    return 0;
}
void NotifyWindow::Initialize()
{
    WNDCLASSEX wc;
    const wchar_t *className = L"BacnNotifyWindowClass";
    const wchar_t *windowName = L"BacnNotifyWindow";
    HINSTANCE hInstance = GetModuleHandle(NULL);
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.lpszClassName = className;
    wc.lpfnWndProc = NotifyWindow::s_WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hIcon = NULL;
    wc.hIconSm = NULL;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    RegisterClassEx(&wc);
    DWORD dwExtStyle = WS_EX_TOPMOST;
    DWORD dwStyle = WS_POPUP | WS_SYSMENU;  
    m_hWnd = CreateWindowEx(
        dwExtStyle,
        className,
        windowName,
        dwStyle,
        300,
        300,
        100,
        100,
        NULL,
        NULL,
        hInstance,
        NULL);  
    s_NotifyWindows.insert(pair<HWND, NotifyWindow*>(m_hWnd, this));
    ShowWindow(m_hWnd, SW_SHOW);
}
NotifyWindow::NotifyWindow()
{
    Initialize();   
}
NotifyWindow::~NotifyWindow()
{
}
void NotifyWindow::OnPaint()
{
}
void NotifyWindow::OnCreate()
{
}