STL valarray usage - C / C++ / MFC Discussion Boards

Rama Krishna Vavilala13-Jun-02 14:45

13-Jun-02 14:45

wilche wrote:
PostThreadMessage.
It did not post to the thread as expected, but GetLastError did not indicate that an error has occurred.

Does the thread in question has it's message queue created. That is does it call any of GetMessage, PeekMessage etc. functions before you call PostThreadMessage from other threads. That might be the problem.

Re: PostThreadMessage

wilche13-Jun-02 16:36

wilche

13-Jun-02 16:36

Sorry my fault,

I have made sure that the message queue has been created properly.

This is because the messages inside the queue were correctly being processed.

Thanks for picking this up!

wilche

link error

13-Jun-02 12:44

Hi,

this was a release build after the code had successfully compiled in debug mode .

nafxcw.lib(winctrl5.obj) : error LNK2005: "public: virtual struct CRuntimeClass * __thiscall CDateTimeCtrl::GetRuntimeClass(void)const " (?GetRuntimeClass@CDateTimeCtrl@@UBEPAUCRuntimeClass@@XZ) already defined in TreeOptionsCtrl.obj

nafxcw.lib(winctrl5.obj) : error LNK2005: "public: static struct CRuntimeClass const  CDateTimeCtrl::classCDateTimeCtrl" (?classCDateTimeCtrl@CDateTimeCtrl@@2UCRuntimeClass@@B) already defined in TreeOptionsCtrl.obj

Do you have an idea what actually the problem is?

Thanks

R.

Re: link error

Rama Krishna Vavilala13-Jun-02 12:52

Rama Krishna Vavilala

13-Jun-02 12:52

How does TreeOptionsControl.cpp look like. Does it by any chance has a definition of CDateTimeCtrl like IMPLEMENT_DYNAMIC(CDateTimeCtrl) or in any of the headers it includes?

Re: link error

13-Jun-02 12:57

TreeOptionsCtrl is from this site (PJ Naughter).
It has definitely IMPLEMENT_DYNAMIC(CDateTimeCtrl, CWnd) in TreeOptionsCtrl.cpp

10x

13-Jun-02 13:00

...and compiles fine without.
Thanks very much

Open files by double clicking

Sun666613-Jun-02 10:48

Sun6666

13-Jun-02 10:48

Hi,

Does anybody know how to associate some file types with a specific application so I can open those files by double clicking them from the Explorer? Can I use the following functions?

EnableShellOpen();
RegisterShellFileTypes(true);

Even if these two functions can be used for this, how can I add my file types to the CSingleDocTemplate(since I am using Single document in my application)?

Thanks!

STL valarray usage

David Leikis13-Jun-02 10:23

David Leikis

13-Jun-02 10:23

I am attempting to use the valarray STL in an MFC app, but I get a compiler error immediately from within the valarray include. I am copying the code sample provided on MSDN at the following location:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcstdlib/html/vclrf_valarray_pow.asp

In particular, the compiler states that "there are not enough parameters in the Min/Max macros"; with just the include file, no code at all! So, MFC can't even build the include!

I am trying to build an RMS average function for a number of points and it would be great if I could use the speed optimization built into the valarray.

If I build the example code from above within a console app, it works well without any errors and it functions also....

Is there something within MFC that is predefining these macros that interferes with the valarray include?

Can this be done as a library function so that I could reference the class that I am attempting to build?

Thanks in advance for any help,
Dave Leikis Confused | :confused:

Re: STL valarray usage

Joaquín M López Muñoz13-Jun-02 12:20

Joaquín M López Muñoz

13-Jun-02 12:20

I guess this is a problem having to do with <windows.h> and the STL headers defining differently min and max. Try #undefining min and max before including the header for valarray.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed?

redeemer13-Jun-02 9:20

redeemer

13-Jun-02 9:20

thanks

Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed? Ans: you can set the parent window as parent to the dialog or disable te window and enalbe it when the dialog is closed

loket13-Jun-02 9:43

loket

13-Jun-02 9:43

redeemer13-Jun-02 9:39

redeemer

13-Jun-02 9:39

How do i set the parent window as parent to the dialog? In the CreateDialog, i give it a parent window, but i can still use the parent window even when the dialog isn't closed.

<b></b>

Rama Krishna Vavilala13-Jun-02 10:10

Rama Krishna Vavilala

13-Jun-02 10:10

Now this is turning into a game OMG | :OMG:

Marc Richarme13-Jun-02 13:13

Marc Richarme

13-Jun-02 13:13

Rama Krishna wrote:
Now this is turning into a game

Yup.. and that message wasn't easy to reply to. Poke tongue | ;-P

Cheers,
Marc
_{Click to see my *real* signature}

Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed?

Tim Smith13-Jun-02 9:43

Tim Smith

13-Jun-02 9:43

thanks

Thanks for what?

Or are you trying to ask a question?

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed?

redeemer13-Jun-02 10:06

redeemer

13-Jun-02 10:06

Thanks for reading my thread.

Passing an object from VB to VC++ ActiveX control

13-Jun-02 8:36

Hi,
I have a Visual C++ ActiveX control and a VB project who is using it and I would like to know how I can pass an object from the control to VB.

The VC++ control "knows" that object from #import but I cannot write it as a parameter type because it's not a COM standard.
I have used a VARIANT type to pass the object to the Control from VB and it seems to work, but I just can't figure out how to make it work the other way around.

Any help would be appreciated.

Thanks,

Re: Passing an object from VB to VC++ ActiveX control

13-Jun-02 9:20

O.k. Thanks for nothing. I just figured it out.

I just use LPUNKNOWN and then after casting it i copy all the data.

Big Grin | :-D

Deleting STL list elements

moredip13-Jun-02 8:38

moredip

13-Jun-02 8:38

Hi all,

So I have a list< double* >, which contains arrays which were created with something like new double[4]. When I'm done with the list I need to free all of the elements. At first I tried this:

list< double* > ::iterator it = my_list.begin();
while( it != my_list.end() )
   delete [](*it);

but that didn't work, with MFC saying the pointer was still valid, I think because the list still contained references to the element.

So I figured the best way would be to walk thru the list, removing, then deleting, elements as I go. But I'm a little unsure about the behaviour of iterators in this situation. For example after the following code:

list< double* > ::iterator my_it = my_list.begin();
my_list.pop_front();

Would my_it stil be valid? Where would it be pointing to?

I need to figure out the quickest way to safely []delete all elements in the list.

Any pointers?

TIA,

Pete

Re: Deleting STL list elements

moredip13-Jun-02 9:06

moredip

13-Jun-02 9:06

Doh!

this code:
while( it != my_list.end() )
delete [](*it);

should have been:
while( it != my_list.end() )
delete [](*it++);

I guess I'm too used to good old for loops Smile | :)

well, I can now just run thru the list, deleting all the elements, then just delete the list.

This is probably the quickest way.... right?

Pete

Re: Deleting STL list elements

Oz Ben Eliezer13-Jun-02 9:09

Oz Ben Eliezer

13-Jun-02 9:09

Try the following:

list< double* >::iterator i;
while ((i = my_list.begin()) != my_list.end())
{
double *p = *i;
my_list.pop_front();
delete [] p;
}

Re: Deleting STL list elements

moredip13-Jun-02 9:18

moredip

13-Jun-02 9:18

That looks like it would work, but I'm not sure if it's the quickest way to do it, calling begin() every time...

Re: Deleting STL list elements

jbarton13-Jun-02 10:20

jbarton

13-Jun-02 10:20

I like to use something like:

while ( ! my_list.empty() )
{
delete [] my_list.front();
my_list.pop_front();
}

Best regards,
John

Re: Deleting STL list elements

moredip13-Jun-02 10:19

moredip

13-Jun-02 10:19

Yeah, that looks nice

Do you think it'd be quicker this way...

for( i = my_list.size(); i >= 0; i-- )
{
delete [] my_list.front();
my_list.pop_front();
}

Im guessing the lack of a function call would speed it up, what do you think?

Pete

Re: Deleting STL list elements

jbarton13-Jun-02 10:34

jbarton

13-Jun-02 10:34

The speed difference would be insignificant. The members of list are generally inlined, so don't add any function call overhead.

John

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