C / C++ / MFC

toxcct1-May-07 23:59

1-May-07 23:59

what about using std::ofstream ?

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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.

viet_ha2-May-07 0:15

viet_ha

2-May-07 0:15

thankx you so much..

Not good at C++

Hamid_RT2-May-07 1:43

Hamid_RT

2-May-07 1:43

In additional you can use of CFile class

WhiteSky

toxcct2-May-07 2:11

2-May-07 2:11

CStdioFile already inherits CFile

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Hamid_RT2-May-07 7:44

Hamid_RT

2-May-07 7:44

Yeah

WhiteSky

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."

toxcct2-May-07 2:17

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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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."

toxcct2-May-07 4:11

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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How to send WM_KEYDOWN message?

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."

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

toxcct1-May-07 23:27

1-May-07 23:27

static_cast<>()...

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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

toxcct2-May-07 3:13

2-May-07 3:13

my bad, i read too fast

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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?