使用wxClientDc的wxWidgets问题

void MyFrame::OnPaint(wxPaintEvent& event) {
    wxPaintDC dc(this);
    // 绘制代码...
}

void MyFrame::OnPaint(wxPaintEvent& event) {
    wxAutoBufferedPaintDC dc(this);
    // 绘制代码...
}

#include <wx/wx.h>

class MyApp : public wxApp {
public:
    virtual bool OnInit();
};

class MyFrame : public wxFrame {
public:
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

private:
    void OnPaint(wxPaintEvent& event);
    wxDECLARE_EVENT_TABLE();
};

enum {
    ID_Hello = 1
};

wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_PAINT(MyFrame::OnPaint)
wxEND_EVENT_TABLE()

IMPLEMENT_APP(MyApp)

bool MyApp::OnInit() {
    MyFrame* frame = new MyFrame("Hello wxWidgets", wxPoint(50, 50), wxSize(450, 340));
    frame->Show(true);
    return true;
}

MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
    : wxFrame(NULL, wxID_ANY, title, pos, size) {
}

void MyFrame::OnPaint(wxPaintEvent& event) {
    wxPaintDC dc(this);
    dc.SetBrush(*wxRED_BRUSH);
    dc.DrawRectangle(10, 10, 100, 100);
}