Urgent: Calling Child Dialog when press F2. - C / C++ / MFC Discussion Boards

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

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!

Re: CreateProcess problem and CString to char* conversion

PJ Arends8-Jan-04 13:18

PJ Arends

8-Jan-04 13:18

will1383 wrote:
Create Process doesn't handle the seperated folder name properly. How can I correct this???

Just a guess, but how about enclosing the file name in quotes. If that don't work, how about converting the path to 8.3 format using GetShortPathName().

will1383 wrote:
How do you convert a CString to a LPTSTR???

CString::GetBuffer() will return an LPTSTR. Just be sure to call ReleaseBuffer() when you are done.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: CreateProcess problem and CString to char* conversion

l a u r e n8-Jan-04 13:42

l a u r e n

8-Jan-04 13:42

to convert the scstring just cast it:

(LPTSTR)(LPTCSTR)myString;

might be a klunk but it works
Smile | :)

"there is no spoon"
biz stuff about me

Re: CreateProcess problem and CString to char* conversion

Prakash Nadar8-Jan-04 16:15

Prakash Nadar

8-Jan-04 16:15

(LPTSTR)(LPTCSTR)myString;

Works but not recommended or safe.

I Touched Osama Bin Ladens Bushy Beard

Re: CreateProcess problem and CString to char* conversion

l a u r e n8-Jan-04 16:28

l a u r e n

8-Jan-04 16:28

i only use it when i know im not going to change anything
Roll eyes | :rolleyes:

"there is no spoon"
biz stuff about me

Re: CreateProcess problem and CString to char* conversion

Prakash Nadar8-Jan-04 16:56

Prakash Nadar

8-Jan-04 16:56

before i knew about getbuffer i have used this kind of type casting to modify the data also, never gave me any problem but not doing it now. Roll eyes | :rolleyes:

I Touched Osama Bin Ladens Bushy Beard

Re: CreateProcess problem and CString to char* conversion

l a u r e n8-Jan-04 17:03

l a u r e n

8-Jan-04 17:03

*coughs and shuffles feet nervously*
i sometimesam too lazy to do the GetBufferSetLength() thing
Blush | :O

"there is no spoon"
biz stuff about me

Re: CreateProcess problem and CString to char* conversion

Tim Smith9-Jan-04 4:11

Tim Smith

9-Jan-04 4:11

Well that is a BAD thing. However, casting to (LPTSTR) to deal with some MS API routines that can not or do not have the arguments defined as (LPCTSTR) works just find AS LONG AS you know the API will not write to the string. Many API's have arguments that have double duties and thus can not be defined as (LPCTSTR).

Tim Smith

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

Re: CreateProcess problem and CString to char* conversion

Jijo.Raj8-Jan-04 19:21

Jijo.Raj

8-Jan-04 19:21

Its very simple to convert a CString to LPTSTR, Just use

CString str;
str.operator LPCTSTR ( );

The "operator LPCTSTR ( )" will return a char pointer to the string data. Wink | ;)

Best Regards,
Jijo.

Yesterday is history,
Tomorrow is a mystery,
But today is a present.

Is there an easy way to change text color in CListCtrl header?

Member 7821548-Jan-04 11:19

Member 782154

8-Jan-04 11:19

Hi,

I am looking for an easy way to change text color in CListCtrl header.

Thank you in advance.

csgogogo

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