I put a bitmap pointer into this class
1class skyGUIEditBox : public skyGUIObject{
2public:
3 skyGUIEditBox(int _id,int _w,int _h,float _x,float _y,ALLEGRO_FONT * _fnt,ALLEGRO_DISPLAY* _dispaly);
4 ~skyGUIEditBox();
5 void SetText(const wchar_t* _text);
6 const wchar_t* GetText();
7
8 void Focus(bool bFocused);
9 void Render();
10 void Update(double dt,ALLEGRO_EVENT * _event=0);
11private:
12 void OnKey( UINT nKey, UINT nRepCnt, UINT nFlags );
13 void OnChar( UINT nChar, UINT nRepCnt, UINT nFlags );
14 void InsertChar(wchar_t aChar);
15 void DeleteChar(TDP aPos);
16 void ClearCookie();
17
18private:
19 int m_wdith;
20 int m_height;
21 ALLEGRO_FONT *m_fnt;
22 ALLEGRO_USTR *m_str;
23 ALLEGRO_BITMAP *m_bg; //I put a bitmap pointer into this class
24 wchar_t m_textbuff[1024];
25 UINT m_charpos;
26 bool m_posI;
27 bool m_gposI;
28 static LRESULT CALLBACK SkyEditWndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam);
29};
Then, in the constructor to initialize it
1skyGUIEditBox::skyGUIEditBox(int _id,int _w,int _h,float _x,float _y,ALLEGRO_FONT * _fnt,ALLEGRO_DISPLAY* _dispaly)
2{
3
4 id=_id;
5
6 bStatic=false;
7 m_wdith=_w;
8 m_height=_h;
9 bVisible=true;
10 bEnabled=true;
11 rect.Set(_x, _y, _x+_w, _y+_h);
12 m_fnt=_fnt;
13 m_charpos=0;
14 m_gposI=false;
15 HWND hWnd = al_get_win_window_handle(_dispaly);
16
17 if (g_LastWndProc == NULL)
18 {
19 g_LastWndProc = (WNDPROC)::GetWindowLong(hWnd,GWL_WNDPROC);
20 if(g_LastWndProc != (WNDPROC)::SetWindowLong(hWnd,GWL_WNDPROC,(LONG)SkyEditWndProc))throw NULL;
21 }
22 ClearCookie();
23 m_str=al_ustr_new_from_utf16((uint16_t*)m_textbuff);
24///////////////////////Here/////////////////////////////////////
25 m_bg=0;
26 m_bg=al_create_bitmap(_w,_h);
27 if(!m_bg)throw NULL;
28////////////////////////////////////////////////////////////////
29}
use it in following function
1void skyGUIEditBox::Render(){
2
3 al_set_target_bitmap(m_bg);
4 al_clear_to_color(al_map_rgba(0,0,0,0));
5 al_draw_ustr(m_fnt,color,1,1,0,m_str);
6 al_draw_rectangle(0,0,m_wdith,m_height,color,1.0f);
7 if(m_posI && m_gposI){
8 int f_height=al_get_font_line_height(m_fnt)-4;
9 int t_width =al_get_ustr_width(m_fnt,m_str);
10 int x1=t_width+1;
11 int y1=2;
12 int x2=x1;
13 int y2=y1+f_height;
14 al_draw_line(x1,y1,x2,y2,color,1.0f);
15 }
16 ALLEGRO_DISPLAY *dis=al_get_current_display();
17 al_set_target_bitmap(al_get_backbuffer(dis));
18 al_draw_bitmap(m_bg,rect.x1,rect.y1,0);
19}
but,when i destory it in destructor function,
skyGUIEditBox::~skyGUIEditBox(){ if(m_bg){ al_destroy_bitmap(m_bg); } ClearCookie(); m_fnt=0; }
The following error occurred:
"Unhandled exception: 0xC0000005: read location 0x00000000 when an access violation occurs in the 0x645c4b16 at 地图编辑器.exe "
.
