Re: PostMessageand SendMessage - C / C++ / MFC Discussion Boards

Waldermort18-Nov-06 7:33

18-Nov-06 7:33

yeah. I was hoping for something like sizeof() which would guarantee the allocated size. Calculating it from the data within the struct could lead to problems if the data was deleted or incorrect.

And once again, your 'Image Viewer' is making my life easier Big Grin | :-D

I just re-coded a lot of my region creating functions only to find the output is not what I expected. My first thought was "$%^&# I calculated the rectangles wrong", so fire up the old viewer, and guess what, the regions are perfect. Without your work I would have spent all night tearing my functions apart trying to find the fault, at least now I know where not to look. Thankyou Rose | [Rose]

Re: dynamic array sizes

PJ Arends18-Nov-06 7:38

PJ Arends

18-Nov-06 7:38

WalderMort wrote:
Thankyou

Hey, I am just glad that someone finds that little app useful.:->

WalderMort wrote:
My first thought was "$%^&# I calculated the rectangles wrong", so fire up the old viewer, and guess what, the regions are perfect. Without your work I would have spent all night tearing my functions apart trying to find the fault, at least now I know where not to look.

And now you know exactly why I wrote it to begin with. Been there, done that D'Oh! | :doh:

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

Re: dynamic array sizes

Waldermort18-Nov-06 7:46

Waldermort

18-Nov-06 7:46

Well I found the problem ( a region being inverted when it no longer needs to be ). I still say you should sell it, even if you sell the development rights, it's a great tool and I'm sure many coders would benefit from it.

Re: dynamic array sizes

Michael Dunn18-Nov-06 14:00

Michael Dunn

18-Nov-06 14:00

You know the size when you do the alloc. If you need to keep that size around for later use, then you have to store it somewhere.
An alternative is to use a vector of bytes:

vector<BYTE> vec(1000);
RGNDATA* pData = (RGNDATA*) &vec[0];
vector<BYTE>::size_type cbyBuffer = vec.size();

--Mike--
Visual C++ MVP Cool | :cool:

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Re: dynamic array sizes

Christian Graus18-Nov-06 14:15

Christian Graus

18-Nov-06 14:15

WalderMort wrote:
Why is it that C has a whole bunch of other functions like calloc(), realloc() and _msize()? The latter is what pains me today.

C is a pain Smile | :)

WalderMort wrote:
Most of you will say to use a vector,

Yes...

WalderMort wrote:
For example I need to allocate space for a RGNDATA struct which is a little more than a simple array. Allocating the space is no problem, but how is it possible to later find out how much memory was allocated? In C a call to _msize() would do the job, but experience tells me not to mix C and C++ when it comes to memory.

The way that classes like vector do it is to store the size in a variable, I am sure.

WalderMort wrote:
Is there a way to do this other than storing the size when it was allocated?

There are tricks with sizeof that I've seen used, such as sizeof(x)/sizeof(char) for the size of a char array. But, I'd be inclined to use vector, the address of item [0] is the address of the whole array. Or, write your own class to handle it.

Christian Graus - C++ MVP

Re: dynamic array sizes

David Crow20-Nov-06 3:25

David Crow

20-Nov-06 3:25

WalderMort wrote:
Allocating the space is no problem, but how is it possible to later find out how much memory was allocated?

This *might* work:

int *x = new int[345];
printf("You allocated %lu bytes\n", *((unsigned long *) x - 4)); // 1380

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

PostMessageand SendMessage

neha.agarwal2718-Nov-06 1:46

neha.agarwal27

18-Nov-06 1:46

I am making a SDI application.In that when a user click a tool bar button a dialog box opens up in that user have to fill sum values n then he has to press save button ...
what i want to do is when user click on save button that particular dialog box s'ld colse down n the values from that dialog box should go in list ctrl made in sdi application

I m not getting the way to it..may be post message or send message is helpful in it but i do not knw how to use them

can anyone help in this

thanxs

Re: PostMessageand SendMessage

Arman S.18-Nov-06 6:59

Arman S.

18-Nov-06 6:59

Hi,

Actually, you'd use PostMessage if your dlg were modeless.
Probably not. The save button closes the dlg, but after that you hold the C++ object of that dlg. So you can retrieve the entered values from the dlg and pass them to the list ctrl;

<br />
CMyDlg dlg;<br />
if (IDOK == dlg.DoModal())<br />
{ // Save button was pressed<br />
    CString val1 = dlg.m_val1;<br />
    // .. and so on<br />
<br />
    m_list.Add (val1); // something like this<br />
}

--
======
Arman

how to register ATL COM object in MFC

kiranin17-Nov-06 23:56

kiranin

17-Nov-06 23:56

After adding ATL Aupport to MRFC application, then i added ATL COM object ,but this object is not registering.... how can i register?

Re: how to register ATL COM object in MFC

ThatsAlok18-Nov-06 0:47

ThatsAlok

18-Nov-06 0:47

kiranin wrote:
After adding ATL Aupport to MRFC application, then i added ATL COM object ,but this object is not registering.... how can i register?

what error is it giving~

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Re: how to register ATL COM object in MFC

kiranin18-Nov-06 0:53

kiranin

18-Nov-06 0:53

no error, just it cant registered in registry, for example when i add context menu items to textfiles it cannot displayed when create through MFC. Now what i want is how can i register ATL COM object in MFC Application

Add context menu item through MFC Application

kiranin17-Nov-06 23:59

kiranin

17-Nov-06 23:59

how can i Add context menu item through MFC Application,
i saw many examples, in all examples context menu item is added through ATL COM wizard,
but my application is MFC, when i launch my application context menu item will be added .

Re: Add context menu item through MFC Application

ThatsAlok18-Nov-06 0:47

ThatsAlok

18-Nov-06 0:47

kiranin wrote:
i saw many examples, in all examples context menu item is added through ATL COM wizard,
but my application is MFC, when i launch my application context menu item will be added .

Handle OnLButtonDown Message and generate your own context menu there

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you

Re: Add context menu item through MFC Application

kiranin18-Nov-06 0:59

kiranin

18-Nov-06 0:59

i want to add shell context menu item to explorer not to my application items.

Re: Add context menu item through MFC Application

Hamid_RT18-Nov-06 1:08

Hamid_RT

18-Nov-06 1:08

I think I saw examples of this object on codeproject did you search?

WhiteSky

Re: Add context menu item through MFC Application

ThatsAlok18-Nov-06 1:28

ThatsAlok

18-Nov-06 1:28

kiranin wrote:
i want to add shell context menu item to explorer not to my application items.

you have to write com component for that... there is no other way! http://www.codeproject.com/shell/shellextguide1.asp[^] series

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
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VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you

SHGetFolderLocation() function gives compile time error.

Sameer_Thakur17-Nov-06 21:40

Sameer_Thakur

17-Nov-06 21:40

Hi all.

In my application I am calling a SHGetFolderLocation() function to load a browse Folder dialog.

I have included Shlobj.h and also I have added shell32.lib file in
Project->Settings->Lib tab.
The version of shell32.dll is 6.0.2900.2180.

But when I tried to compile a program, it gives me a compile time error
" error C2065: 'SHGetFolderLocation' : undeclared identifier "

Can anybody help?

Thanks

Rakesh Thakur

Re: SHGetFolderLocation() function gives compile time error.

Hamid_RT17-Nov-06 23:47

Hamid_RT

17-Nov-06 23:47