Re: How to send Msg to child window - C / C++ / MFC Discussion Boards

bneacetp25-Jun-04 16:31

25-Jun-04 16:31

Is this code within a class's member function?

Happy Programming and God Bless!

"Your coding practices might be buggy, but your code is always right."

Internet::WWW::CodeProject::bneacetp

Re: Getting around vanishing pointers

Michael Dunn25-Jun-04 17:06

Michael Dunn

25-Jun-04 17:06

See if your TreeList can associate an LPARAM with each item, like regular trees and lists do. If so, put the pointer in each item's LPARAM. Then when the items are removed from the control (TVN_DELETEITEM for trees, LVN_DELETEITEM for lists) delete the pointer then.

--Mike--
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Re: Getting around vanishing pointers

CaesarCZ26-Jun-04 6:48

CaesarCZ

26-Jun-04 6:48

I guess there is not. The CTreeItem only stores the pointers you give him, not the actual data. So if you delete the data, the pointer the CTreeItem has is useless. Why don't you just delete them once you stop using the CTreeItem?

(I have never worked with MFC etc, but this is a common practice)

Re: Getting around vanishing pointers

brdavid26-Jun-04 8:22

brdavid

26-Jun-04 8:22

Thanks for the tips, guys. I'll try looking in that direction! Cool | :cool:

Brightness of LCD Display

Blake Miller25-Jun-04 12:52

Blake Miller

25-Jun-04 12:52

I am using SetDeviceGammaRamp and it is working fine for my nVidia CRT monitors running Windows 2000.

On the Tablet and Panel PC running Windows XP - Nothing happens.

Anyone got some clues?

Terminate word application

elephantstar25-Jun-04 12:42

elephantstar

25-Jun-04 12:42

Hi there,

I created a process that opens up a word file and its contents are parsed. Now, when the user tries to open up the exact same file, it doesn't parse. Is it because the file is currently open? How do I check that and would I need to terminate the process before creating a new one? Here is what I have so far.

Thanks!

/*************************************************/
STARTUPINFO stStartUpInfo;
PROCESS_INFORMATION pProcessInfo = new PROCESS_INFORMATION;

memset(&startInfo, 0, sizeof(STARTUPINFO));

startInfo.cb = sizeof(STARTUPINFO);

startInfo.dwFlags = STARTF_USESHOWWINDOW;
startInfo.wShowWindow = SW_SHOWDEFAULT;

CreateProcess(NULL, cmdline, NULL, NULL, FALSE,
NORMAL_PRIORITY_CLASS, NULL,
NULL, &startInfo, procInfo);

ParseFile();

/********************************/
int CParser::ParseFile(CString filename)
{
int ret = 0;
CStdioFile fname;
if (fname.Open(filename, CFile::modeRead))
{
//parsing code here
}
else
{
ret = -1;
fname.Close();
}
return ret;
}

Re: How to send Msg to child window

Sumit Kapoor25-Jun-04 11:03

Sumit Kapoor

25-Jun-04 11:03

Hi,

How to send msg to a window where i can't reach..
e.g: Mainframe=>splitter pane=>frame=>splitter pane=>formview
now I want to sen msg from mainfrm to formview..

How can i send this..
THAT'S THE QUESTION.
Thanks

Sumit Kapoor---

Re: How to send Msg to child window

Christopher Lloyd25-Jun-04 15:22

Christopher Lloyd

25-Jun-04 15:22

Use the API function GetWindow to walk down the child list of each window below Mainframe. You'll need some way to identify the correct children (assuming that one or more of the levels has > 1 child) but as you assumedly know who you're trying to send a message to that shouldn't be a problem.
Does that help?
Chris

How to send Msg to child window

Sumit Kapoor25-Jun-04 10:21

Sumit Kapoor

25-Jun-04 10:21

Hi Dear,

I want to send a Message to sub-sub window class...
I know there is role of Spy++ in this...

please give me any idea..what to find in spy++ & How to send messag to that class..
If possible code snippet for msg send...Please....
Thanks

---Sumit Kapoor---

Re: How to send Msg to child window

Jeremy Falcon25-Jun-04 10:36

Jeremy Falcon

25-Jun-04 10:36

Take a look at either the SendMessage() or PostMessage() API calls in MSDN.

Jeremy Falcon

Re: How to send Msg to child window

Sumit Kapoor25-Jun-04 10:48

Sumit Kapoor

25-Jun-04 10:48

hi,
my actual class is so deep I cann't use send message from mainframe to that class.
I think need to use spy++..but how to..I don't know..Plesase help me..

Thanks

Sumit Kapoor--- sumit_kapoor1980@hotmail.com

Re: How to send Msg to child window

David Crow25-Jun-04 10:38

David Crow

25-Jun-04 10:38

If you have a handle to the child window, just use SendMessage(). Otherwise, if you are using MFC, does SendMessageToDescendants() help?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: How to send Msg to child window

Sumit Kapoor25-Jun-04 10:47

Sumit Kapoor

25-Jun-04 10:47

hi,
my actual class is so deep I cann't use send message from mainframe to that class.
I think need to use spy++..but how to..I don't know..Plesase help me..

Thanks

---Sumit Kapoor--- sumit_kapoor1980@hotmail.com

Re: How to send Msg to child window

David Crow25-Jun-04 10:55

David Crow

25-Jun-04 10:55

So what exactly is your question - how to send a message to a child window, or how to use Spy++?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

run HTML application from my MFC program

Michae_geffen25-Jun-04 9:44

Michae_geffen

25-Jun-04 9:44

How can I run HTML application from my MFC project, I found that \ CreatProcess() can run .exe but not HTML.

Michael Geffen

Re: run HTML application from my MFC program

Michael Dunn25-Jun-04 9:56

Michael Dunn

25-Jun-04 9:56

Use ShellExecute(). See the FAQ for more:
6.4 How do I run another program from my program?[^]

--Mike--
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-- Buffy

Re: run HTML application from my MFC program

David Crow25-Jun-04 10:24

David Crow

25-Jun-04 10:24

Have you looked into ShellExecute(..., "open", ...)?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

problem with old code about pointer!!!

lewislewis_lewis25-Jun-04 9:17

lewislewis_lewis

25-Jun-04 9:17

I have much older program, they using old way about pointer.
// Old code 1
void Func()
{
char *p = "Hello";
*p = 'h'; // It has "Access Violation" probelm in VC++6.0!
}

// Old code 2
void Func()
{
long ptr;
char p[];
ptr = p // has problem with type !!
}

Shoud I change all bad code ???? Do we has nother way to use older codes?

Re: problem with old code about pointer!!!

David Crow25-Jun-04 9:51

David Crow

25-Jun-04 9:51

lewislewis_lewis wrote:
char p[];

There must be a number of some sort holding the brackets apart (e.g., char p[5]), or p must be initialized to something that has a size (e.g., char p[] = "Hi").

lewislewis_lewis wrote:
Shoud I change all bad code ????

Yes, most definitely!

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: problem with old code about pointer!!!

lewislewis_lewis25-Jun-04 10:00

lewislewis_lewis

25-Jun-04 10:00

Can we use some special compiling prameter setting to fix is?
Thank you!!!

Re: problem with old code about pointer!!!

David Crow25-Jun-04 10:30

David Crow

25-Jun-04 10:30

To fix what exactly?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: problem with old code about pointer!!!

Anonymous25-Jun-04 15:34

Anonymous

25-Jun-04 15:34

I means let the old program running well on VC++ 6.0. Because the old program made on VC4.0, and it work well. The program is very big, so i would not like change it.

Thanks

Re: problem with old code about pointer!!!

Michael Dunn25-Jun-04 9:59

Michael Dunn

25-Jun-04 9:59

*p = 'h' tries to modify the memory holding a string literal. This is not something you should do because the memory might be read-only (thus generating a GPF when you write to it). Even if it works, it may not work on all compilers or OSes.

--Mike--
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Re: problem with old code about pointer!!!

Jeremy Falcon25-Jun-04 12:13

Jeremy Falcon

25-Jun-04 12:13

Michael Dunn wrote:
This is not something you should do because the memory might be read-only (thus generating a GPF when you write to it).

What if your memory is properly allocated? See my other post in this thread for an example.

Jeremy Falcon

Re: problem with old code about pointer!!!

Jeremy Falcon25-Jun-04 12:10

Jeremy Falcon

25-Jun-04 12:10

lewislewis_lewis wrote:
char *p = "Hello";

That's a huge no-no for a number of reasons, and a memory error waiting to happen. For one, if you don't allocate your memory, you're not guaranteed to have it available for your program to use.

Instead Func() should look like this:

void Func()
{
    char p[] = "Hello";
    *p = 'h';
}

In this instance, *p acts just like p[0].

Jeremy Falcon

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