Stopping a RichTextBox updating

[kelvin.koogan@googlemail.com]

I am trying to do an operation where I find and highlight all
instances of a string in a RichTextBox. E.g.

pMatchesFound = Regex::Matches( pRichTextBox->Text, pStr, options);

for (int i = 0; i < pMatchesFound->Count; i++)
{
Match ^m = pMatchesFound[i];

pRichTextBox->SelectionSta rt = m->Index;
pRichTextBox->SelectionLengt h = m->Length;
pRichTextBox->SelectionCol or = SystemPens::Hig hlightText->Color;
pRichTextBox->SelectionBackC olor = SystemPens::Hig hlight->Color;
}

However the user sees the text scrolling through the RichTextBox as
all the strings are highlighted, which isn't what I want. I've tried
to prevent this with SuspendLayout but it doesn't work.

Is there a way to stop the RichTextBox updating while I'm highlighting
all the strings?

TIA,
KK

[Herfried K. Wagner [MVP]]

Re: Stopping a RichTextBox updating

<kelvin.koogan@ googlemail.coms chrieb:

>I am trying to do an operation where I find and highlight all
instances of a string in a RichTextBox. E.g.
>
pMatchesFound = Regex::Matches( pRichTextBox->Text, pStr, options);
>
for (int i = 0; i < pMatchesFound->Count; i++)
{
Match ^m = pMatchesFound[i];
>
pRichTextBox->SelectionSta rt = m->Index;
pRichTextBox->SelectionLengt h = m->Length;
pRichTextBox->SelectionCol or = SystemPens::Hig hlightText->Color;
pRichTextBox->SelectionBackC olor = SystemPens::Hig hlight->Color;
}
>
However the user sees the text scrolling through the RichTextBox as
all the strings are highlighted, which isn't what I want. I've tried
to prevent this with SuspendLayout but it doesn't work.
>
Is there a way to stop the RichTextBox updating while I'm highlighting
all the strings?

You could use the 'SendMessage' function (exported by "user32.dll ") together
with 'WM_SETREDRAW' to disable/enable redrawing of the window.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>