C / C++ / MFC Discussion Boards

Re: print double array on openGL window???

Richard MacCutchan12-Dec-09 1:50

Richard MacCutchan

12-Dec-09 1:50

This looks good, did you have a question about it?

Convert _variant_t to char*

lemonash11-Dec-09 7:01

lemonash

11-Dec-09 7:01

Hi folks!

Can anyone kindly tell me how to convert _variant_t to char*?

Thanks!

char Buf[100];
_variant_t var;
?

Re: Convert _variant_t to char*

Rolf Kristensen12-Dec-09 2:52

Rolf Kristensen

12-Dec-09 2:52

Found this with a quick google search:

<br />
char Buf[100];<br />
_variant_t var;<br />
if (V_VT(&var) == VT_BSTR)<br />
{<br />
    USES_CONVERSION;<br />
    cont char* pStr = OLE2T(var);<br />
    strcpy(Buf, pStr);<br />
}<br />

http://stackoverflow.com/questions/117755/is-there-a-faster-way-of-getting-a-char-from-a-variantt-than-const-charbs[^]
http://www.ddj.com/architect/184416822[^]

Re: Convert _variant_t to char*

lemonash12-Dec-09 4:11

lemonash

12-Dec-09 4:11

Dear Snakefoot,

Thank you very much!

I will do like this:

<br />
if (V_VT(&var) == VT_BSTR)<br />
{<br />
   strcpy(Buf, (const char*)(_bstr_t)var);<br />
}<br />

I don't like to use mfc and atl(USES_CONVERSION included in afxconv.h or atlconv.h), but thank you all the same for your kindness! Thumbs Up | :thumbsup:

Transparent Window in Remote desktop [modified]

Cvaji11-Dec-09 1:15

Cvaji

11-Dec-09 1:15

I have an MFC dialog which is made transparent usingSetLayeredWindowAttributes().
When i start this transparent window in my machine, i can't click.
When i connect this machine remotely from any other machine and when i try to click the background of that window, i can click.

I tried with different values for alpha in SetLayeredWindowAttributes() and i found that if alpha value is equals or above 5, behavior in both cases are same.

I want to disable the clicking of background of transparent window with alpha value as 1 in remote desktop also. Or any other way for displaying the background clicking in remote desktop

Please help me.

modified on Friday, December 11, 2009 7:24 AM

Re: Transparent Window in Remote desktop

Migounette11-Dec-09 6:09

Migounette

11-Dec-09 6:09

You can check if you are in remote:

Retrieves the Remote Desktop Services session associated with a specified process.

http://msdn.microsoft.com/en-us/library/aa382990(VS.85).aspx[^]

// 0 - Not Remote Session
// 1 - Remote Session
// -1 - Internal Error
//
int isRemoteSession()
{
DWORD sessId = 0;

if(ProcessIdToSessionId(GetCurrentProcessId(), &sessId) != 0)
{
return (sessId == 0) ? 0 : 1;
}

return -1; // Internal Error
}

For the rest, eliminate the alpha when needed

Difference between EndDialog and EndWindow?

Prabhu09200911-Dec-09 0:22

Prabhu092009

11-Dec-09 0:22

I have 2 queries, Kindly clarify it.

1. What is the difference between EndDialog() and EndWindow()?
2. Is it possible to use EndDialog for closing the modeless dialog?

Help me out!

Re: Difference between EndDialog and EndWindow?

Adam Roderick J11-Dec-09 0:42

Adam Roderick J

11-Dec-09 0:42

1. I never heard or used EndWindow. Confused | :confused:

2. For a modeless dialog, why you need EndDialog, i think it wont be needed usually, rather you have to use ShowWindow(SW_HIDE) mostly.Well if you use EndDialog, then you have initialize and dialog once again since it get destroyed on EndDialog.

Величие не Бога может быть недооценена.

Re: Difference between EndDialog and EndWindow?

Richard MacCutchan11-Dec-09 0:54

Richard MacCutchan

11-Dec-09 0:54

See the descriptions here[^] about how to use Dialog boxes correctly.

Re: Difference between EndDialog and EndWindow?

Rajesh R Subramanian11-Dec-09 1:30

Rajesh R Subramanian

11-Dec-09 1:30

Prabhu092009 wrote:
1. What is the difference between EndDialog() and EndWindow()?

EndDialog() is a standard Windows function, and there's no such thing as EndWindow.

“Follow your bliss.” – Joseph Campbell

error LNK2005:

Benjamin Bruno10-Dec-09 23:56

Benjamin Bruno

10-Dec-09 23:56

Hi all

While building my application the compiler shows

msvcrtd.lib(MSVCRTD.dll) : error LNK2005: __splitpath already defined in libcmtd.lib(splitpat.obj)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: __getcwd already defined in libcmtd.lib(getcwd.obj)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: _free already defined in libcmtd.lib(dbgheap.obj)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: _calloc already defined in libcmtd.lib(dbgheap.obj)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: _atoi already defined in libcmtd.lib(atox.obj)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: _atol already defined in libcmtd.lib(atox.obj)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: __CrtDbgReport already defined in libcmtd.lib(dbgrpt.obj)

How to resolve this .

Re: error LNK2005:

Rajesh R Subramanian11-Dec-09 0:02

Rajesh R Subramanian

11-Dec-09 0:02

Hi,

Here are the possible causes[^] why the linker might report this error.

“Follow your bliss.” – Joseph Campbell

Re: error LNK2005:

Richard MacCutchan11-Dec-09 0:55

Richard MacCutchan

11-Dec-09 0:55

See this answer[^] about Link order.

Re: error LNK2005:

KarstenK11-Dec-09 1:08

KarstenK

11-Dec-09 1:08

use /VERBOSE:LIB in the project settings.

You are using some single thread libs with multi thread libs.

Last rescue is /FORCE Unsure | :~

Press F1 for help or google it.
Greetings from Germany

Re: error LNK2005:

Benjamin Bruno11-Dec-09 20:10

Benjamin Bruno

11-Dec-09 20:10

Hi still I am not able to resolve this. Confused | :confused:

Re: error LNK2005:

KarstenK13-Dec-09 21:26

KarstenK

13-Dec-09 21:26

I am sorry for you.

Take out all user libraries dependencies of your project. Or start a new one. You need one that can be build. And than step for step include the libs until it doesnt work.

Press F1 for help or google it.
Greetings from Germany

Child Dialog gets hidden behind activex control [modified]

indra27110-Dec-09 23:27

indra271

10-Dec-09 23:27

Hello,

I have a main dialog in which I have embedded an activex control.
This dialog also has a child dialog.

When the main dialog comes up the child dialog is always partially hidden behind the activex control.
Only on mouse click it comes to the fore front.

CLIP CHILDREN didn't work.

Any help on this problem?

THX

modified on Friday, December 11, 2009 5:40 AM

Re: Child Dialog gets hidden behind activex control

Richard MacCutchan11-Dec-09 0:52

Richard MacCutchan

11-Dec-09 0:52

You should not use Dialogs within Dialogs, it is bad design. Your main window should be a normal window that shows the child dialog as and when it is needed.

Re: Child Dialog gets hidden behind activex control

indra27111-Dec-09 4:55

indra271

11-Dec-09 4:55

well, that may be the case, but i am stuck with this approach for now.

any way to resolve the issue i reported?

Re: Child Dialog gets hidden behind activex control

Abhi Lahare11-Dec-09 5:26

Abhi Lahare

11-Dec-09 5:26

Well I had the same situation few years back, If I remember correctly I handled the OnInitialUpdate() and OnSize() call of Parent class,

The first problem as I see is an repainting problem,
Hope this help.
Abhi

Re: Child Dialog gets hidden behind activex control

Richard MacCutchan11-Dec-09 5:29

Richard MacCutchan

11-Dec-09 5:29

indra271 wrote:
any way to resolve the issue i reported?

Sounds like some sort of focus issue, but it's difficut to guess from your description.

making an non-blocking call in VC++

hrishiS10-Dec-09 23:03

hrishiS

10-Dec-09 23:03

Hi to All,

I have got a message Queue.
A thread function which should be able to process the queue, (that is if any data is available, then do some processing)....otherwise do nothing..

Now, my problem is...I cannot keep a while loop (inside the thread) and keep checking for the queue if there is any element in the queue...because it will consume lots of CPU processing power....Instead, I found the best method is to ......have a method, say getq()...which can be a blocking call...ie, inside my thread while loop , I should be able to do something like

threadFunction()
{
while(1)
{
   if(getq() != 0)
   {
   }
}
}

so the functionality will be...it will go inside(if block)only when there is an element in the queue...otherwise wait there...

Now, I need help/hints to make the getq function...(which will return any value only if there is any elemt in the queue...otherwise it will not return the control...It should keep waiting till any element is there in queue )

thanks in advance

-----------------------------
I am a beginner

Re: making an non-blocking call in VC++

CPallini10-Dec-09 23:15

CPallini

10-Dec-09 23:15

This way you're simply 'passing the problem' to getq method.

BTW when the queue is empty your thread may go to sleep (i.e. call Sleep [^]) to release the CPU.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: making an non-blocking call in VC++

Cedric Moonen10-Dec-09 23:21

Cedric Moonen

10-Dec-09 23:21

You have to use events for that: you can wait (without consuming any CPU time) on an event to be notified. Typically what happens is that you have a thread pushing elements into your queue and a thread popping element from the queue. The thread popping elements wait on an event to be signaled by the other thread after he pushed something into the queue. You will also need to add proper synchronization on your queue to avoid accessing it from both threads at the same time.

I suggest you start by reading this article[^] which will give you an overview of threads and synchronization techniques.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: making an non-blocking call in VC++

Rajesh R Subramanian10-Dec-09 23:47

Rajesh R Subramanian

10-Dec-09 23:47

If you're using MFC, you could simply derive a class from CWinThread. It's really simple and you don't need to maintain a queue or anything. MFC does everything for you. You could use PostThreadMessage[^] to post a message to the message queue of the thread.

I have a feeling that the family of WaitFor... functions may be of help to you if you aren't using MFC!

“Follow your bliss.” – Joseph Campbell

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.