Re: http GET/POST request through proxy - C / C++ / MFC Discussion Boards

Implementation of GetSafeHandle and siblings.

Johann Gerell2-Dec-02 1:59

Johann Gerell

2-Dec-02 1:59

Hi,

An hour ago or so I was hit by the lightning Dead | X|

when I realized that I hadn't a clue on how MS implemented the set of GetSafe... functions.

I can not find their implemntations in the MFC sources. Where can I find them, or, better, could someone please explain to me how a member function can be called for NULL object without wreaking havoc? Confused | :confused:

Thanks!

Don't _think_ you are, _know_ you are! (Morpheus in The Matrix)

Re: Implementation of GetSafeHandle and siblings.

Tim Smith2-Dec-02 2:30

Tim Smith

2-Dec-02 2:30

As long as the method isn't virtual, there is no problem with calling a member function where "this" is NULL. At no time is "this" ever dereferenced during the call process. So as long as you check for "this == NULL" in the member function, things will work just fine.

return this ? m_hWnd : NULL;

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Implementation of GetSafeHandle and siblings.

Johann Gerell2-Dec-02 2:58

Johann Gerell

2-Dec-02 2:58

Thanks,

It's so much fun to learn new details on C++. Big Grin | :-D

I've always (up until now) checked for NULL _before_ calling a member function for an object that may be NULL. Now I have my very own GetSafe... functions Poke tongue | ;-P

But, the nitpicker in me still wants to know where these MFC functions are implemented. Have I failed to install _all_ MFC sources (is that even possible?) perhaps... Unsure | :~

Re: Implementation of GetSafeHandle and siblings.

Alois Kraus2-Dec-02 6:41

Alois Kraus

2-Dec-02 6:41

_AFXWIN_INLINE HWND CWnd::GetSafeHwnd() const
{ return this == NULL ? NULL : m_hWnd; }

in MFC\Include\AFXWIN2.INL

Yours,

Alois Kraus

Scrolling a CListBox

Jase Jennings2-Dec-02 0:00

Jase Jennings

2-Dec-02 0:00

Hi,

I'm having big problems trying to scroll a listbox in code. I can set the scrollbar ok, but I can't figure out how to scroll the text properly.

Can anybody suggest how i can instruct a CListBox to scroll by a given amount, and have the listbox take care of updating both the scrollbar and the client area (i.e. have it scroll the text correctly). Clearly CListBox knows how to do this, because if i just grab the scrollbar of a standard CListBox, it works. So how do i ask it to do this for me. Effectively, i want to 'emulate' having dragged the scrollbar.

Thanks

Jase

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Re: Scrolling a CListBox

Iain Clarke, Warrior Programmer2-Dec-02 5:39

Iain Clarke, Warrior Programmer

2-Dec-02 5:39

Have a look at LB_SETTOPINDEX / CListBox::SetTopIndex. These should help you.
Or you could simply send the listbox WM_VSCROLL messages.

Iain Clarke.

http GET/POST request through proxy

Chintan1-Dec-02 23:59

Chintan

1-Dec-02 23:59

Sir, my computer is running under the proxy server. I want to developed application which is able to make http GET and POST request to a specified server.

C.R.Naik

Re: http GET/POST request through proxy

rrrado2-Dec-02 0:35

rrrado

2-Dec-02 0:35

Send GET/POST as usually, instead that you will connect your socket to proxy server instead of HTTP server. Headers will remail the same, in simple case (no proxy authorization ...)

rrrado

Re: http GET/POST request through proxy

geo_m2-Dec-02 2:38

geo_m

2-Dec-02 2:38

good behavior is also to send the complete url of the request, which is not necessary when using direct connection. Instead of

<br />
GET /index.htm HTTP/1.1<br />
Header: Value<br />

which is allowed for direct connecting, you should use the full syntax:

<br />
GET http://www.codeguru.com/index.htm HTTP/1.1<br />
Header: Value<br />

from this the proxy will be able to know, where you want to connect Wink | ;)

Minimize to task bar

rrrado1-Dec-02 23:26

rrrado

1-Dec-02 23:26

I have modeless dialog windiw created in separate thread. Clicking to minimize button cause shrinking this window to size of title bar and it moves to bottom left corner of rhe desktop. How to minimize this window to task bar ? And show this window in task list so i could switch to this window by Alt+Tab ?

Thank you

rrrado

Re: Minimize to task bar

Paul M Watt2-Dec-02 9:53

Paul M Watt

2-Dec-02 9:53

It sounds like you are using the WS_EX_TOOLWINDOW style.

What you will need to do is remove the WS_EX_TOOLWINDOW style in the SC_MINIMIZE portion of the WM_SYSCOMMAND message handler, and restore this style setting when the SC_RESTORE event is received in the WM_SYSCOMMAND handler.

The toolwindow prevents your windows from appearing in the Taskbar, however it also makes your windows minimize to the desktop like you have described.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: Minimize to task bar

rrrado2-Dec-02 22:25

rrrado

2-Dec-02 22:25

I'm not using WS_EX_TOOLWINDOW style. It is ordinal dialog box window, i tried popup and also overlapped type, without any extended styles set in resource editor.

rrrado

Re: Minimize to task bar

Paul M Watt3-Dec-02 6:00

Paul M Watt

3-Dec-02 6:00

Could you view your windows styles in Spy++ and let me know which styles both regular and EX that your window is using? That would help me figure out whats causing your problems.

Thanks

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: Minimize to task bar

rrrado3-Dec-02 7:23

rrrado

3-Dec-02 7:23

Dialog style :

14CF0044 (WS_OVERLAPPEDWINDOW|WS_VISIBLE|WS_CLIPSIBLINGS|WS_OVERLAPPED|DS_3DLOOK|DS_SETFONT)

EXTENDED STYLES :

00010100 (WS_EX_LEFT|WS_EX_LTRREADING|WS_EX_RIGHTSCROLLBAR|WS_EX_WINDOWEDGE|WS_EX_CONTROLPARENT)

Parent window : NONE ( created with NULL parent window)

Thank you.

PS

I create more ot this modeless dialog windows, each in separate UI-thread. Another bug is that sometimes more of them are dreawn with active title bar, like when all of them would have focus set. So after creating of dialog i set focus for it, but it still happens rarely.

Thank you

rrrado

Re: Minimize to task bar

Paul M Watt3-Dec-02 8:09

Paul M Watt

3-Dec-02 8:09

It looks like if you add the WS_EX_APPWINDOW style you will be all set!

Good Luck

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: Minimize to task bar

rrrado3-Dec-02 22:39

rrrado

3-Dec-02 22:39

I tried to set WS_EX_APPWINDOW style, now it is in task bar next to main window, but windows is not able to switch to main window, it always switch to my dialog even if i click to main window in task bar Unsure | :~

I will perhaps write my own window switching wihtin my application with ctrl-tab.

Thank you very much

rrrado

Disable Close button in titlebar

rrrado1-Dec-02 22:22

rrrado

1-Dec-02 22:22

Hi,

how to disable Close button in titlebar of Popup window with minimize and maximize button enabled ?

Thanks

rrrado

Re: Disable Close button in titlebar

Rickard Andersson²⁰1-Dec-02 23:15

Rickard Andersson²⁰

1-Dec-02 23:15

In MFC:

CMenu* mnu = this->GetSystemMenu(FALSE);
mnu->ModifyMenu(SC_CLOSE, MF_BYCOMMAND ,MF_GRAYED);

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Disable Close button in titlebar

rrrado1-Dec-02 23:22

rrrado

1-Dec-02 23:22

Thank you ! Rose | [Rose]

rrrado

Comparing images

Ravish1-Dec-02 22:20

Ravish

1-Dec-02 22:20

Any pointers to implementations which compare two images ?
Thanks

Re: Comparing images

Rickard Andersson²⁰1-Dec-02 23:41

Rickard Andersson²⁰

1-Dec-02 23:41

I think it's just to read the bitmap data of the images and then compare the BITMAP structures(?)

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Comparing images

Jase Jennings2-Dec-02 0:06

Jase Jennings

2-Dec-02 0:06

load them into memory and memcmp ? alternatively, crc check the files ?
either of the above will work. could use some more information on what it is you're trying to achieve ...

Jase

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Re: Comparing images

Scott H. Settlemier2-Dec-02 5:15

Scott H. Settlemier

2-Dec-02 5:15

Trying to find differences in two images?
Trying to determine if two images are of the same thing?
Trying to determine if two images are of the same scene?
What sort of comparison?

Adding Folders to the Projects in the Workspace

Franz Klein1-Dec-02 21:00

Franz Klein

1-Dec-02 21:00

:Does anybody know how to add folders to a project, so that it gets displayed in the workspace on Visual C++ 6.0.

I know one can do it with the mouse, but I want to have my AppWizard do it according to the options the user has chosen. Are there any functions that I can call.

The only other way is to parse the .dsp file and add the folders there.

Smile | :)

Franz Klein

CryptEncrypt

devvvy1-Dec-02 19:56

devvvy

1-Dec-02 19:56

hi, having trouble debugging my lil subroutine that encrypt and decrypt a buffer.

algorithm used is RC2 (8 BYTE PER BLOCK). HKEY derived from a passwd with MD5. API used:
(a) CryptEncrypt
(b) CryptDecrypt

The plaintext buffer going INTO CryptEncrypt was 28 BYTE (This means that u will have to call CryptEncrypt four times). The number of bytes in the returned encrypted buffer is 40 BYTE.

Now, i know that the encrypted buffer may be "up to a block size" larger than the plaintext buffer (according to MSDN). Since I called CryptEncrypt four times, the encrypted buffer can be as large as:

encrypted buffer size = 28 BYTE + 4 x 8 BYTE = 60 BYTE

QUESTION 1: Is this understanding correct?
QUESTION 2:
* RC2 used - 8 BYTE per Block.
* plain text buffer = 28 BYTEs
* return buffer = 40 BYTEs (Is this reasonable?)

Thanks.

norm

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