Re: How to write CString value to txt file??? - C / C++ / MFC Discussion Boards

Re: How to write CString value to txt file???

CPallini2-May-07 0:08

CPallini

2-May-07 0:08

Probably you need WriteString method of CStdioFile, see here
[^].
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.

Re: How to write CString value to txt file???

viet_ha2-May-07 0:15

viet_ha

2-May-07 0:15

thankx you so much..

Not good at C++

Re: How to write CString value to txt file???

Hamid_RT2-May-07 1:43

Hamid_RT

2-May-07 1:43

In additional you can use of CFile class

WhiteSky

Re: How to write CString value to txt file???

toxcct2-May-07 2:11

toxcct

2-May-07 2:11

CStdioFile already inherits CFile

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Re: How to write CString value to txt file???

Hamid_RT2-May-07 7:44

Hamid_RT

2-May-07 7:44

Yeah

WhiteSky

Re: How to write CString value to txt file???

cp98762-May-07 2:13

cp9876

2-May-07 2:13

If you use std::fstream you need to manually cast the CString e.g.

#include <fstream>

#using namespace std;

...

ofstream out("filename.txt");

CString str("this is a test");

out << (LPCSTR) str << endl;

Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

Re: How to write CString value to txt file???

toxcct2-May-07 2:17

toxcct

2-May-07 2:17

what about adding a out.close() at last ? Poke tongue | ;-P

also, your example works, but i wanted the OP to search a little by himself too... such easy code is not too hard to write when you're pointed in the right direction, what i did in my first reply

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Re: How to write CString value to txt file???

cp98762-May-07 4:06

cp9876

2-May-07 4:06

I had to leave something for the OP to find out - he only asked how to write the string to the file after all Poke tongue | ;-P

. I often don't call the .close() function as it happens automatically when the stream goes out of scope.

Actually I was hoping that someone was going to embarass me and tell me what I've been missing all these years writing explicit casts from CStrings to LPCSTR to use std::stream and also printf, TRACE macros etc.

I only posted as finding the need to explicitly cast can be a bit of a trick that is hard to find.

Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

Re: How to write CString value to txt file???

toxcct2-May-07 4:11

toxcct

2-May-07 4:11

hum, i would have gone into C++ cast operators, like static_cast<LPCTSTR>(str) :p

but, was it really necessary to explicitely cast here ? i'm not 100%, but i have no compiler with me, so...

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Re: How to write CString value to txt file???

cp98762-May-07 14:29

cp9876

2-May-07 14:29

Well I've been doing it for years but have only recently upgraded from VC6 to VS2005. You've made me do some experiments and it has been improved (fixed?) in VS2005. The following code segment

<br />
		{<br />
		std::ofstream out("test.txt");<br />
		CString str;<br />
		str = "This is a test line";<br />
		out << str;<br />
		}<br />

on VC6 produces one line in the file:

<br />
00423FDC<br />

which I assume is the address of the CString. In VS2005 it works as you would expect. I guess MS finally included a suitable operator<< overload. I can now stop typing all those (LPCSTR) casts! Thanks tox Big Grin | :-D

Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

How to send WM_KEYDOWN message?

eli150219791-May-07 23:21

eli15021979

1-May-07 23:21

Hi,

I have a dialog which contains different controls,and I want to send
a WM_KEYDOWN message to the parent dialog when a control receives a WM_KEYDOWN
message.

In the dialog,I overrided the OnKeyDown() method as follow:

void Frm_WKFailureMatrix::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	// TODO: Add your message handler code here and/or call default
	CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}

and in the control,I also overrided the OnKeyDown() method , and inside
that handler I call the ::SendMessage(...) method,as follow:

void WkMfcButton::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	// TODO: Add your message handler code here and/or call default
	int x = 0;
	::SendMessage(GetOwner()->GetSafeHwnd() , WM_KEYDOWN , 0 , 0);
}

My problem is that ::SendMessage() accept the third and fourth parameters
as WPARAM and LPARAM(UINT_PTR and LONG_PTR).
How can I convert nChar,nRepCnt and nFlags to WPARAM and LPARAM so the
parent dialog will receive the correct parameters???

With best regards,
Eli

Re: How to send WM_KEYDOWN message?

toxcct1-May-07 23:27

toxcct

1-May-07 23:27

static_cast<>()...

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Re: How to send WM_KEYDOWN message?

JudyL_MD2-May-07 3:10

JudyL_MD

2-May-07 3:10

toxcct wrote:
static_cast<>()...

Actually, that won't work correctly. The OP actually needs to pack the three parameters back into the wParam and lParam. The MAKELPARAM and MAKEWPARAM macros will do this. Refer to the WM_KEYDOWN doc to determine where each item goes.

Judy

Re: How to send WM_KEYDOWN message?

toxcct2-May-07 3:13

toxcct

2-May-07 3:13

my bad, i read too fast

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Re: How to send WM_KEYDOWN message?

Rajesh R Subramanian1-May-07 23:31

Rajesh R Subramanian

1-May-07 23:31

Why are you doing such a messy thing? This way, you will be writing keydown handlers for each and every control. Do you want your code to look like Sphagetti? What if you add two new controls later? Did I not ask you to override the PreTranslateMessage()? Did you ever try that?

Re: How to send WM_KEYDOWN message?

eli150219792-May-07 0:45

eli15021979

2-May-07 0:45

Hi brahmma,

I know the way of overriding PreTranslateMessage.
The problem is that I've put a breakpoint inside that function but I never
stop there.
My code is :

virtual BOOL PreTranslateMessage(MSG* pMsg);

and the implementation is :

BOOL Frm_WKFailureMatrix::PreTranslateMessage(MSG* pMsg)
{
	if (pMsg->message == WM_KEYDOWN)
	{
		int x = 0;
	}
	return TRUE;
}

However,if i move the focus into a button(by mouse click),the button receives the WM_KEYDOWN message.

1. Is it because of that automatically when I select a window , the focus
is moving into the first control inside that window?
2. As far as I understand , the parrent windw shall receive the WM_KEYDOWN
message and dispatch it to all of its children , isn't it???

Thanks again,
Eli

Re: How to send WM_KEYDOWN message?

Rajesh R Subramanian2-May-07 4:33

Rajesh R Subramanian

2-May-07 4:33

if(pMsg->message == WM_KEYDOWN)
{
  if(pMsg->wParam == VK_ESCAPE)
     AfxMessageBox(_T("You pressed the Escape Key"));
}

This is just an example. Use the virtual key codes to verify which key was pressed. Check out MSDN for virtual key codes.

OCX to DLL

Nilesh Hapse1-May-07 23:19

Nilesh Hapse

1-May-07 23:19

Hello,

I have never worked with C++.
I've a project writtern by another person which creates a OCX output.
Actually it's only a class library. Now I want to change the output type to .DLL instead of .OCX.

Any idea how to do it??

Re: OCX to DLL

toxcct1-May-07 23:25

toxcct

1-May-07 23:25

...in the project properties in all probabilities...

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Re: OCX to DLL

Nilesh Hapse1-May-07 23:28

Nilesh Hapse

1-May-07 23:28

hi toxcct,

I tried but could not find project property which lets me to change the output type.

Can you pls explain the steps how do I do it?

Re: OCX to DLL

toxcct1-May-07 23:30

toxcct

1-May-07 23:30

what IDE do you use (VC6, VS7, VS71, VS8) ?

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Re: OCX to DLL

Nilesh Hapse1-May-07 23:31

Nilesh Hapse

1-May-07 23:31

VC 6 IDE....

Regards,
Nilesh

Re: OCX to DLL

prasad_som2-May-07 1:28

prasad_som

2-May-07 1:28

Got to Settings-->Link-->Output File name. Change its extension to .dll.

Prasad
MS MVP - VC++

Re: OCX to DLL

Nilesh Hapse2-May-07 21:04

Nilesh Hapse

2-May-07 21:04

Thank you very much Prasad

How to wait for a callback function?

rumburack1-May-07 22:33

rumburack

1-May-07 22:33

Dear all,

I am programming against an API of an application that simulates robot movements.

Whenever I send a command that makes the robot move, the application starts a new thread for that movement and sends a callback when this thread and the accompanying movement have ended. I have no access/handle to that thread, but only the callback. However, the movement only starts, when the function, in which the movement command was issued, returns to the main runloop. So I cannot wait inside the function for the callback to occur, because then the motion would never been started, I cannot wait (or ::Sleep) "outside", because the runloop would get blocked and would also prevent the motion from beeing started.

The reason for waiting is that I have to check feedback from that particular motion (e.g. whether there is a collision), before I can start a new motion.

Is there any way to work around for what seems to me like an unsolvable dilemma?

Thanks a lot for all your comments

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