Win32 control richedit, how to find string by using EM_FINDTEXT win32 messages

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win32 RichEdit control supports large count of words. i'm tring to find some string in this kind of control. I find the win32 message

EM_FINDTEXT

on msdn. if the spfecified string was found , the return value would be the index of the control's text.

I tried,but it does not work.

What I have tried:

here is some simple codes.

int result = 0;
FINDTEXT findtext_param;

RichEdit1->Text = "Hello,this is a test from younth.";

char find_str[256] = "from";
findtext_param.lpstrText = find_str;
findtext_param.chrg.cpMin = 0;
findtext_param.chrg.cpMax = -1;

result = SendMessage(RichEdit1->Handle,EM_FINDTEXT,FR_DOWN,(LPARAM)&findtext_param);
if(result >= 0) ShowMessage("string found.");
else ShowMessage("string not found.");

you can see the value of the control has been setted,it still returns -1.
what's wrong in the code ?

Posted 18-Sep-18 22:08pm

Yount_0701

Updated 19-Sep-18 0:15am

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Leo Chapiro · Answer 1 · 2018-09-19T00:15:00

You need to select your range first:

C++

int result = 0;
FINDTEXT findtext_param;

RichEdit1->Text = "Hello,this is a test from younth.";

char find_str[256] = "from";
findtext_param.lpstrText = find_str;
findtext_param.chrg.cpMin = 0;
findtext_param.chrg.cpMax = -1;

// Missing this part
	CHARRANGE cr;
	cr.cpMin = -1;
	cr.cpMax = -1;

	SendMessage(RichEdit1->Handle, EM_EXSETSEL, 0, (LPARAM)&cr);
// <--

result = SendMessage(RichEdit1->Handle,EM_FINDTEXT,FR_DOWN,(LPARAM)&findtext_param);
if(result >= 0) ShowMessage("string found.");
else ShowMessage("string not found.");