C / C++ / MFC

How to view MFC class's code?

4-Jun-02 19:33

Hello all,

I have drawn some stuff on my view Smile | :)

[Those who have been following my GDI threads would know I am trying to decode a funny image format]

Well now I have sorta decoded it and I wanna save it as a bitmap.

Any help is hugely appreciated!

Nish Smile | :)

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

dazinith4-Jun-02 17:46

dazinith

4-Jun-02 17:46

if i want to look at the actual code behind something like CEdit, how do i look at the actual code of that class? the way i have been doing it is deriving a class from it and then looking at the base class functions.. i know there has to be another way right?

p.s. im using .net

thanks!

-dz

Nish Nishant4-Jun-02 17:42

4-Jun-02 17:42

%Program Files%\Microsoft Visual Studio.NET\Vc7\atlmfc\src\mfc

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

dazinith4-Jun-02 18:05

dazinith

4-Jun-02 18:05

hrm.. no easy browser tho eh? i see the filenames aren't exactly descriptive.. i tried doing a text search in the folder for CEdit, but of the 4 files it returned none really seemed like the right thing.. im just using CEdit as an example tho.. thanks for the info!

-dz

Alexandru Savescu4-Jun-02 22:04

Alexandru Savescu

4-Jun-02 22:04

The files are AfxWin.h, AfxCmn.inl, AfxWin2.inl, WinCtrl1.cpp. They containt the declaration of the class and the implementation. What exactly are you looking for.

Best regards,
Alexandru Savescu

Michael P Butler4-Jun-02 22:56

Michael P Butler

4-Jun-02 22:56

CEdit inherits from CWnd, you might need to look at the CWnd source code too.

Michael Smile | :)

Errata 1: p. 154, section 'Defusing'. For 'red wire' read 'blue wire'.

Confusion regarding the "smartness" of smart pointers

Tomasz Sowinski5-Jun-02 0:21

Tomasz Sowinski

5-Jun-02 0:21

You have the following browsing options in vs.net:

1) Object Browser - in View|Other Windows. This window also opens when you select 'Browse definition' from context menu invoked on class name in ClassView
2) You can open mfc.bsc file using File|Open, this will show the complete hierarchy in Object Browser window. mfc.bsc is in vc7\atlmfc\src\mfc
3) ClassView displays 'Base classes and Interfaces' for each class in your project. Just expand it and you'll see base class --and-- its base classes as well, so you'll be able to drill down from CYourEdit through CEdit, CWnd, CCmdTarget to CObject

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

Nish Nishant4-Jun-02 17:29

Re: Confusion regarding the "smartness" of smart pointers

4-Jun-02 17:29

CoInitialize(NULL);	
ISimplePgpPtr p(__uuidof(SimplePgp)); 	
p->EncryptFile("d:\\in.txt","d:\\a90.pgp","test@test.com");
p.Release();			
CoUninitialize();

Notice how I am calling Release()

My question is this. If it's a smart pointer shouldn't it automatically call Release() in its destructor?

Nish

p.s. I tried leaving out the call to Release() and it crashed Smile | :)

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Jim Crafton4-Jun-02 17:41

Jim Crafton

4-Jun-02 17:41

because you called CoUninitialize which happens before the smart pointer falls off the stack and has it's destructor called
try this:

CoInitialize(NULL);	
{
     ISimplePgpPtr p(__uuidof(SimplePgp)); 	
     p->EncryptFile("d:\\in.txt","d:\\a90.pgp","test@test.com");
     p.Release();			
}
CoUninitialize();

Re: Confusion regarding the "smartness" of smart pointers

Nish Nishant4-Jun-02 17:41

Re: Confusion regarding the "smartness" of smart pointers

4-Jun-02 17:41

Jim Crafton wrote:

CoInitialize(NULL);
{
ISimplePgpPtr p(__uuidof(SimplePgp));
p->EncryptFile("d:\\in.txt","d:\\a90.pgp","test@test.com");
p.Release();
}
CoUninitialize();

Thanks. That worked even when I commented out the call to Release()

Nish Smile | :)

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Ed Gadziemski5-Jun-02 14:45

Ed Gadziemski

5-Jun-02 14:45

Making it a statement block (enclosed in braces { }) forces the code to execute as a block and clean up after itself.

Smart Pointers - revisited

Nish Nishant4-Jun-02 17:16

Re: Smart Pointers - revisited

4-Jun-02 17:16

First of all, Thanks to Rama, Mazy and Jason.

Here is my code now. It works by the way Smile | :)

ISimplePgpPtr p(__uuidof(SimplePgp)); 	
p->EncryptFile("d:\\in.txt","d:\\a90.pgp","test@test.com");
p.Release();	
CoUninitialize();

Now this is my problem. I am puzzled by the behavior of p.

When I hit a . after p and when I type a -> after p I get different drop downs from intellisense.

Can someone clear all this up?

I tried a . instead of -> for the EncryptFile but got a compile error!

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Le centriste4-Jun-02 17:26

Le centriste

4-Jun-02 17:26

The . shows the member of _com_ptr_t class. this class has the -> operator overloaded, which shows you the member of ISimplePgp class.

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Re: Smart Pointers - revisited

Nish Nishant4-Jun-02 17:26

Re: Smart Pointers - revisited

4-Jun-02 17:26

Michel Prévost wrote:
The . shows the member of _com_ptr_t class. this class has the -> operator overloaded, which shows you the member of ISimplePgp class.

Thanks Michel. Makes sense now Smile | :)

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

nay4-Jun-02 18:23

nay

4-Jun-02 18:23

Michel is right it's just overloaded.

Extra info.

I finished a Design Patterns class last semester and the overloaded operator -> was given as an example. It's a Proxy design pattern. If you're interested here's a link.

Houston Design Patterns [same page]

It's in the Structural Patterns. Check out the C++ demo for Proxy design pattern. When you get to the source I believe it's the 3rd example.

nay

Help, please! How to getactiveview from MyApp

lucy4-Jun-02 16:49

lucy

4-Jun-02 16:49

Hello, CPians, I have an MFC SDI application, and I want to access to CMyView from CMyApp::InitInstance(), how can I get it?

Thanks a lot in advance! Rose | [Rose]

Nish Nishant4-Jun-02 17:18

4-Jun-02 17:18

lucy wrote:
I want to access to CMyView from CMyApp::InitInstance(),

Have you created your main frame window? If so you can call GetActiveView on the main frame pointer.

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

lucy4-Jun-02 17:26

lucy

4-Jun-02 17:26

yes, it should be created in the standard initialization code in CMyApp::InitInstance(). But what is the pointer to the main frame window? I tried to use m_pMainWnd, but it has no member function of GetActiveView.

Nish Nishant4-Jun-02 17:25

4-Jun-02 17:25

((CFrameWnd*)m_pMainWnd)->GetActiveView()

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.