C / C++ / MFC Discussion Boards

Re: Serial communication and how to timeout

J.B.9-Jan-04 4:09

J.B.

9-Jan-04 4:09

Thank you again Antti,

they are the perfect answers. Really appreciated.

Re: Serial communication and how to timeout

SiddharthAtw8-Jan-04 21:41

SiddharthAtw

8-Jan-04 21:41

Use Mutex object.Although it is bit heavy interms of speed. But it is reliable and U will have control on it

Re: Serial communication and how to timeout

J.B.9-Jan-04 1:29

J.B.

9-Jan-04 1:29

Thanks SiddharthAtw,

I will have a look that as well.

Please help me!!

Ryulee8-Jan-04 18:16

Ryulee

8-Jan-04 18:16

How return the system menu ID when chlick and select "move" or "Size" or "Close" of the system menu?Please write some code for me, thanks!!

Re: Please help me!!

David Crow9-Jan-04 3:32

David Crow

9-Jan-04 3:32

Look for WM_SYSCOMMAND, SC_MOVE, SC_SIZE, and SC_CLOSE.

A rich person is not the one who has the most, but the one that needs the least.

Re: Please help me!!

Ryulee11-Jan-04 17:42

Ryulee

11-Jan-04 17:42

Thanks!But i think is how return the menu ID, that is when you click the "move" or "Size" or "Close".How doing i know click which command?Thanks!

Re: Please help me!!

David Crow12-Jan-04 2:32

David Crow

12-Jan-04 2:32

Those are the menu identifiers. When you interact with the system menu, the window receives a WM_SYSCOMMAND message. Depending on the menu option selected, one of the SC_xxx types will be in the wParam parameter. Check out MSDN for plenty of examples.

A rich person is not the one who has the most, but the one that needs the least.

Re: Please help me!!

Ryulee14-Jan-04 17:11

Ryulee

14-Jan-04 17:11

Thank you!

How can i get this event what the virtual address of my process be changed by the windows??

zx_sanjin8-Jan-04 15:14

zx_sanjin

8-Jan-04 15:14

e.g.

int *pA = new int;
*pA = 10; //此时捕获事件？

SetAValue(10);

I don't want to overload the operator '='.

Can I do it?

or

What is the way the transaction of the database?

Best regards!

Re: How can i get this event what the virtual address of my process be changed by the windows??

l a u r e n8-Jan-04 17:04

l a u r e n

8-Jan-04 17:04

ummmmm
ur posting makes absolutely no sense whatsoever
please try to ask a meaningful question so all of chris's happy helpers (thats us btw) can answer you
Smile | :)

"there is no spoon"
biz stuff about me

Grabbing messages while busy

Ernesto D.8-Jan-04 15:07

Ernesto D.

8-Jan-04 15:07

Hi all, my app has a very time consuming function where all files on the computer are ennumerated, and ibe put a "cancel" button on the dialog so the user can cancel the ongoing operation, but (of course) the app doesnt process its messages while the ennumeration is running, so it never sees the user pressing the cancel button.
I know im supposed to implement some code inside the time consuming function so the app has a chance to get and process its messages, but i dont know exacly what functions to call. BTW, the app is a WTL - dialog based app (not MFC).
Any help would be much appreciated.

Re: Grabbing messages while busy

Christian Graus8-Jan-04 15:15

Christian Graus

8-Jan-04 15:15

Ernesto D. wrote:
I know im supposed to implement some code inside the time consuming function so the app has a chance to get and process its messages, but i dont know exacly what functions to call.

You're supposed to do the work in a worker thread, which will leave your UI thread responsive. Smile | :)

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Grabbing messages while busy

l a u r e n8-Jan-04 17:06

l a u r e n

8-Jan-04 17:06

or ... worst case scenario (if ur allergic to multi-threading) you should use PeakMessage() etc to see if anythings waiting

but thats bad and we dont do lazy bad things here do we?

Roll eyes | :rolleyes:

"there is no spoon"
biz stuff about me

Re: Grabbing messages while busy

Tim Smith9-Jan-04 4:08

Tim Smith

9-Jan-04 4:08

Multithreading isn't something you just flip a switch and now your application is multithreaded. If you haven't laid the groundwork for resource locking, it would be a VERY bad idea to try to make an application multithreaded when a message pump is such a simple and functional alternative.

Tim Smith

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

Re: Grabbing messages while busy

Ernesto D.8-Jan-04 18:27

Ernesto D.

8-Jan-04 18:27

Thanks for your answers, i was hoping to avoid multple treads, since the app is just a very "basic" utility that searches for certain files, but if its the only way to go then, so be it.
why would it be considered "bad" to use PeakMessage() etc.?
thanks.

Re: Grabbing messages while busy

2249178-Jan-04 22:29

224917

8-Jan-04 22:29

Try this in your while loop..

<br />
if(GetMessage(&msg,NULL,0,0))<br />
{<br />
      DispatchMessage(&msg);<br />
      if(msg.wParam==WM_DESTROY)<br />
	{<br />
		PostQuitMessage(0);<br />
		return;<br />
	}<br />
}<br />

greatest thing is to do wot others think you cant Smile | :)

suhredayan@omniquad.com

Urgent: Calling Child Dialog when press F2.

IrishSonic8-Jan-04 14:08

IrishSonic

8-Jan-04 14:08

Hiya I want to call my child dialog(a dialog for searching..) when F2 is pressed. But I keep getting:
Debug Assertion Failed! File: wincore.cpp Line: 880

I call the dialog in PreTranslateMessage i.e

BOOL CCreateCustomerInvoice::PreTranslateMessage(MSG* pMsg)
{
// TODO: Add your specialized code here and/or call the base class
if( pMsg->message == WM_KEYDOWN )
{
switch( pMsg->wParam )
{
case VK_F2: // if F2 key is pressed
CSearch search; // child dialog class
search.DoModal(); // call dialog
break;
} //end of switch
} //end of if

return CDialog::PreTranslateMessage(pMsg);
}

How do I do this?? Thanks.

Re: Urgent: Calling Child Dialog when press F2.

l a u r e n8-Jan-04 14:39

l a u r e n

8-Jan-04 14:39

ummmmm isnt ur child dialog being declared within the function and thereby it is a local variable that will disappear when the function exits?

make it class level and show it in the keypress handler

"there is no spoon"
biz stuff about me

Re: Urgent: Calling Child Dialog when press F2.

Weiye Chen8-Jan-04 18:58

Weiye Chen

8-Jan-04 18:58

Well, i think u should handle it in the OnKeyDown handler.

afx_msg void OnKeyDown(
   UINT nChar,
   UINT nRepCnt,
   UINT nFlags 
);

Then check the nChar value for VK_F2...

Weiye, Chen
When pursuing your dreams, don't forget to enjoy your life...

Moving a window

michou8-Jan-04 13:09

michou

8-Jan-04 13:09

I know it sounds a little silly, but it's not. (or maybe it is Wink | ;)

) I'm looking for a way to move awindow by dragging it not from the title bar (it doesn't have one), but by anywhere in the window.
I knew how this was done in Delphi, but with VisualC++, I'm still a litlle unconfortable.
Thanks a lot!

Re: Moving a window

Brad Bruce8-Jan-04 13:52

Brad Bruce

8-Jan-04 13:52

You have to catch WM_NCHITTEST and respond back HTCAPTION, not matter where you really are.

Look at the clock sample that came with MSVC (I think)

Re: Moving a window

michou8-Jan-04 18:55

michou

8-Jan-04 18:55

NOw I really don't understand a thing...
I've tried using the onMOuseMove event and moving the window (with MoveWindow() ), but my results were quite... unpredictible Confused | :confused:

Re: Moving a window

Brad Bruce9-Jan-04 1:22

Brad Bruce

9-Jan-04 1:22

The OS will do the moving for you, just as if you dragged the caption around. You don't need to do any moving yourself

See http://www.codeproject.com/dialog/dragwindows.asp?target=moving%7Cwindow[^]

Re: Moving a window

michou12-Jan-04 17:49

michou

12-Jan-04 17:49

Yes, but if I have no caption bar ata all? Anyway, it's fixed and works just fine!
10x! Cool | :cool:

CreateProcess problem and CString to char* conversion

will13838-Jan-04 11:52

will1383

8-Jan-04 11:52

I'm trying to run a program using CreateProcess, but I am unable to run the program due to getting a 998 error, or an "Invalid access to memory location." error. I know the reason for this is because of how CreateProcess handles path names. Here's my call to CreateProcess:

CreateProcess(appPath,cmdLineInfo,NULL,NULL,FALSE,NORMAL_PRIORITY_CLASS,NULL,NULL,&si,&pi);

It should work like a charm, but the problem lies within the path specified in the appPath String. This is what is in the CString appPath:

"C:\Directory_1\Directory secion 2\executable.exe"

Create Process doesn't handle the seperated folder name properly. How can I correct this???

In addition:

How do you convert a CString to a LPTSTR???

Any help is GREATLY appreciated. Thanks!

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