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digitalmars.D.learn - Encapsulation Win32 SDK with class in DMD2028 problem--Help wanted

reply Sam Hu <samhudotsamhu gmail.com> writes:
Hello,

After my reading below post:
http://d.puremagic.com/issues/show_bug.cgi?id=2580
I can compile the win32 SDK sample in dmd\sample folder.After that I tried to
encapsulate all those staff in class.Attached is my chance.Below is a short
description about all the 3 classes:
WinClass:Encapsulation of WNDCLASSEX
WinFrame:Encapsulation of window frame
WinApp:Encapsulation of the Gui application 

Here I have a couple of question.It would be grateful if anybody here kindly
let me know,though I do know it is a bit long and it is  just an excise of a
beginner:
1.The program compiled but runs with an Access Violation error.I can not found
the place the error occurred.I tried to comments out the try...catch block,but
the program runs invisible and with 100% CPU usage,I have to aborted from the
task manager. 
2.Is it possible to encapsulate the callback function 
int WindowProc(HWND hWnd, uint uMsg, WPARAM wParam, LPARAM lParam)
into any of the three classes?Which one should be the ideal place?
3.Is is possible to encapsulate all the framework into just one class,say
WinFrame,and then we can call it by 
auto app=new WinFrame;
app.show;
If yes,how?
4.Is it possible to use main() other than int WinMain(),if yes,how?
And I do know point 3 and 4 may be a longer story and there are a lot of GUI
libararies for reference.But I can not gain a clear idea just by reading the
other's large project with out short explanation.So really appreciate,if
anybody can teach me.

Thanks and best regards,
Sam
Apr 17 2009
next sibling parent reply Sam Hu <samhudotsamhu gmail.com> writes:
Forget attachment.Resent.

Sam Hu Wrote:


 Hello,
 
 After my reading below post:
 http://d.puremagic.com/issues/show_bug.cgi?id=2580
 I can compile the win32 SDK sample in dmd\sample folder.After that I tried to
encapsulate all those staff in class.Attached is my chance.Below is a short
description about all the 3 classes:
 WinClass:Encapsulation of WNDCLASSEX
 WinFrame:Encapsulation of window frame
 WinApp:Encapsulation of the Gui application 
 
 Here I have a couple of question.It would be grateful if anybody here kindly
let me know,though I do know it is a bit long and it is  just an excise of a
beginner:
 1.The program compiled but runs with an Access Violation error.I can not found
the place the error occurred.I tried to comments out the try...catch block,but
the program runs invisible and with 100% CPU usage,I have to aborted from the
task manager. 
 2.Is it possible to encapsulate the callback function 
 int WindowProc(HWND hWnd, uint uMsg, WPARAM wParam, LPARAM lParam)
 into any of the three classes?Which one should be the ideal place?
 3.Is is possible to encapsulate all the framework into just one class,say
WinFrame,and then we can call it by 
 auto app=new WinFrame;
 app.show;
 If yes,how?
 4.Is it possible to use main() other than int WinMain(),if yes,how?
 And I do know point 3 and 4 may be a longer story and there are a lot of GUI
libararies for reference.But I can not gain a clear idea just by reading the
other's large project with out short explanation.So really appreciate,if
anybody can teach me.
 
 Thanks and best regards,
 Sam
Apr 17 2009
parent "Denis Koroskin" <2korden gmail.com> writes:
On Fri, 17 Apr 2009 13:22:21 +0400, Sam Hu <samhudotsamhu gmail.com> wrote:


 Forget attachment.Resent.

 Sam Hu Wrote:


 Hello,

 After my reading below post:
 http://d.puremagic.com/issues/show_bug.cgi?id=2580
 I can compile the win32 SDK sample in dmd\sample folder.After that I  
 tried to encapsulate all those staff in class.Attached is my  
 chance.Below is a short description about all the 3 classes:
 WinClass:Encapsulation of WNDCLASSEX
 WinFrame:Encapsulation of window frame
 WinApp:Encapsulation of the Gui application

 Here I have a couple of question.It would be grateful if anybody here  
 kindly let me know,though I do know it is a bit long and it is  just an  
 excise of a beginner:
 1.The program compiled but runs with an Access Violation error.I can  
 not found the place the error occurred.I tried to comments out the  
 try...catch block,but the program runs invisible and with 100% CPU  
 usage,I have to aborted from the task manager.
 2.Is it possible to encapsulate the callback function
 int WindowProc(HWND hWnd, uint uMsg, WPARAM wParam, LPARAM lParam)
 into any of the three classes?Which one should be the ideal place?
 3.Is is possible to encapsulate all the framework into just one  
 class,say WinFrame,and then we can call it by
 auto app=new WinFrame;
 app.show;
 If yes,how?
 4.Is it possible to use main() other than int WinMain(),if yes,how?
 And I do know point 3 and 4 may be a longer story and there are a lot  
 of GUI libararies for reference.But I can not gain a clear idea just by  
 reading the other's large project with out short explanation.So really  
 appreciate,if anybody can teach me.

 Thanks and best regards,
 Sam




Here is a nice article:
http://www.gamedev.net/reference/programming/features/win32wrapper/page2.asp
It's in C++, but still applicable and relevant.
Apr 17 2009
prev sibling parent "Denis Koroskin" <2korden gmail.com> writes:
On Fri, 17 Apr 2009 13:19:16 +0400, Sam Hu <samhudotsamhu gmail.com> wrote:


 Hello,

 After my reading below post:
 http://d.puremagic.com/issues/show_bug.cgi?id=2580
 I can compile the win32 SDK sample in dmd\sample folder.After that I  
 tried to encapsulate all those staff in class.Attached is my  
 chance.Below is a short description about all the 3 classes:
 WinClass:Encapsulation of WNDCLASSEX
 WinFrame:Encapsulation of window frame
 WinApp:Encapsulation of the Gui application

 Here I have a couple of question.It would be grateful if anybody here  
 kindly let me know,though I do know it is a bit long and it is  just an  
 excise of a beginner:
 1.The program compiled but runs with an Access Violation error.I can not  
 found the place the error occurred.I tried to comments out the  
 try...catch block,but the program runs invisible and with 100% CPU  
 usage,I have to aborted from the task manager.


Need to look at source code to determine the reason.


 2.Is it possible to encapsulate the callback function
 int WindowProc(HWND hWnd, uint uMsg, WPARAM wParam, LPARAM lParam)
 into any of the three classes?Which one should be the ideal place?


yes. Once you created a window and received a hWnd handle, bind your class and
hWnd. One of the two ways:
1) global WinClass[HWND] _hWndToWinClass;
_hWndToWinClass[hWnd] = this;

2) SetWindowLong(hWnd, GWL_USERDATA, cast(int)this);

WinClass getWinClassByHWND(HWND hWnd)
{
1)    if (auto ptr = hWnd in _hWndToWinClass) return *ptr;
      return null;

2)    return cast(WinClass)GetWindowLong(hWnd, GWL_USERDATA);
}


Now when you receive a callback, get a corresponding WinClass reference and
redirect to it:
extern(Windows) LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM
lParam)
{
    // a lookup from HWND to WinClass here:
    WinClass win = getWinClassByHWND(hWnd);

    if (win is null) {
        return DefWindowProcW(hWnd, message, wParam, lParam);
    }

    return win.wndProc(hWnd, message, wParam, lParam);
}


 3.Is is possible to encapsulate all the framework into just one  
 class,say WinFrame,and then we can call it by
 auto app=new WinFrame;
 app.show;
 If yes,how?


It's possible, of course, but it's a lot of code to write.


 4.Is it possible to use main() other than int WinMain(),if yes,how?
 And I do know point 3 and 4 may be a longer story and there are a lot of  
 GUI libararies for reference.But I can not gain a clear idea just by  
 reading the other's large project with out short explanation.So really  
 appreciate,if anybody can teach me.


I am successfully using both and have no problems. Just write void main() {} or
follow win32 guide on digitalmars.com
I prefer void main() personally as it is shorter to write :)


 Thanks and best regards,
 Sam
Apr 17 2009