C / C++ / MFC

Re: Changing color of text in edit control

4-Oct-06 8:57

Here's a way...

Add a handler in the parent window/dialog for the WM_CTLCOLOR
message.

For example, to set the text of an edit control with an ID of
"IDC_MYEDITCONTROL" to light blue:

<br />
HBRUSH MyDialogOrWindowClass::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)<br />
{<br />
    HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);<br />
<br />
    if (pWnd->GetDlgCtrlID() == IDC_MYEDITCONTROL)<br />
        pDC->SetTextColor(RGB(0, 0, 255));  <br />
<br />
    return hbr;<br />
}<br />

Mark

Hamid_RT4-Oct-06 9:10

Hamid_RT

4-Oct-06 9:10

See WM_CTLCOLOREDIT

WhiteSky

Weird MFC problem

Johpoke4-Oct-06 7:55

Johpoke

4-Oct-06 7:55

Im working with MFC in VC6.0

I have a button which sets a edit box some stuff, then waits, then sets it again and waits three times:

on click:

set box "3"
sleep 1000

set box "2"
sleep 1000

set box "2"
sleep 1000

//stuff

set box "done with stuff"

it counts down, but then ignores setting the box... it only sets the last one, done with stuff...

ive tried with SetDlgItemText, UpdateData(FALSE) [and the rest of that one] and manualy hiding/showing dlg items.. it allways just skips the ones withing waits...

why/how can i fix it?

thanks!

/Johannes

Johannes

ThatsAlok4-Oct-06 7:59

ThatsAlok

4-Oct-06 7:59

code snippet

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Mark Salsbery4-Oct-06 8:35

4-Oct-06 8:35

Johannes,

Calling Sleep() in your UI thread prohibits the Windows messages
required (WM_PAINT) to update the control from being processed.

Try this:

on click:

set box "3"
box.Invalidate()
box.UpdateWindow()
sleep 1000

set box "2"
box.Invalidate()
box.UpdateWindow()
sleep 1000

set box "2"
box.Invalidate()
box.UpdateWindow()
sleep 1000

Keep in mind, calling Sleep() like this effectively freezes your
user interface for 3 seconds...not always the desired effect Smile | :)

Hope this helps,
Mark

Johpoke4-Oct-06 8:42

Johpoke

4-Oct-06 8:42

Yea it kinda frezes but thats OK,

Im not exactly sure how thoes functions are to be used, the dlg box is called status, and the variable to it (add member variable) is m_status, so normaly i use:
m_status = "Two!";
UpdateData(FALSE);
To set it to "Two!". But how would i use th ones you said?
ive got loads to learn..

thanks!!

/Johannes

Mark Salsbery4-Oct-06 9:03

4-Oct-06 9:03

m_status = "Two!";
UpdateData(FALSE);

That's fine. UpdateData() will set the text of the control.
But still, if you are going to sleep, you need to make sure the
text is redrawn on the screen beforehand, otherwise it won't be repainted
until after the Sleep()s. Smile | :)

Mark

Johpoke4-Oct-06 9:05

Johpoke

4-Oct-06 9:05

How do i make it repaint?

thanks!

/Johannes

Mark Salsbery4-Oct-06 9:14

4-Oct-06 9:14

Force it to repaint immediately (after setting the new text)
by using these two functions:

Invalidate();
UpdateWindow();

Mark

Johpoke4-Oct-06 9:16

Johpoke

4-Oct-06 9:16

Works perfectly!

thanks a million!

/Johannes

Chris Meech4-Oct-06 8:46

Chris Meech

4-Oct-06 8:46

The thread that is doing the sleeping is also the thread that would be 'painting' the new text. When your method is complete, there will be four paint messages that are handled one right after the other in to quick a fashion so that you see only the final result.

As to how to 'fix' this, you can implement a timer instead of sleeping and repond to the timer messages.

Chris Meech

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David Crow4-Oct-06 9:10

David Crow

4-Oct-06 9:10

It sounds like you need a separate thread to do the work so that the main thread can respond to the UI messages. Without more details, however, I can't say for sure.

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Johpoke4-Oct-06 9:18

Johpoke

4-Oct-06 9:18

Problem is resolved using:

Invalidate();
UpdateWindow();

thanks to MSalsbery and the rest whom replied

thanks all!

/Johannes

Converting to VC8

Waldermort4-Oct-06 7:41

Waldermort

4-Oct-06 7:41

I just installed VC8 and am in the process of integrating my projects. There are many errors I have never seen before, also the layout of VC8 is somewhat confusing.

Two errors are my main concern right now:
1. error C2058: constant expression is not integral
Comes from an enum declared within a class

enum Keys
{
    classesRoot		= HKEY_CLASSES_ROOT,
};

and:
2. cannot convert parameter 1 from '_single_tile *' to 'std::_Vector_iterator<_Ty,_Alloc>'

tiles.erase(&tiles[p2]);

where tiles is a vector of structs. This works well in VC6, I can't understand why VC8 throws an error.

Chris Meech4-Oct-06 7:48

Chris Meech

4-Oct-06 7:48

With the first one, locate the definition of HKEY_CLASSES_ROOT. As the error message indicates, it must be integral, so wherever you have it defined, it is likely not integral. As to your second one, I'm guessing that the changes implemented to the STL that ships with VC8 are considerable when comparing it to the STL that shipped with VC6. There is likely a standards conformance reason for some change that is causing your code to now produce that error. Someone with more STL knowledge might provide better insight though.

Waldermort4-Oct-06 8:01

Waldermort

4-Oct-06 8:01

I don't mean to sound stupid, but what does integral mean?

Chris Meech4-Oct-06 8:33

Chris Meech

4-Oct-06 8:33

Integral means that the type must be int or at the least convertable to int.

Waldermort4-Oct-06 8:11

Waldermort

4-Oct-06 8:11

Well this fixed the first error, though I am still unsure what the error means.

enum Keys
{
    classesRoot     = 0x80000000,//HKEY_CLASSES_ROOT,
    currentUser     ,//= HKEY_CURRENT_USER,
    localMachine    ,//= HKEY_LOCAL_MACHINE,
    users           ,//= HKEY_USERS,
    performanceData ,//= HKEY_PERFORMANCE_DATA,
    currentConfig   ,//= HKEY_CURRENT_CONFIG,
    dynData         //= HKEY_DYN_DATA
};

As for the second error, I still don't know how to fix.  I could typecast it (bad programming) but I would prefer to fix it the correct way.

Nish Nishant4-Oct-06 8:07

Nish Nishant

4-Oct-06 8:07

(2) That should never have compiled anyway. The standard way to use erase is to pass an iterator (vector.begin() + index).

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
Currently working on C++/CLI in Action for Manning Publications.
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