EM_CHARFROMPOS always returning result as (65535, 65535)

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CPoint point;
::GetCursorPos(&point);

CEdit* pt = (CEdit*)GetDlgItem(IDC_SOMEID);
DWORD dEditcontrol = SendMessage(EM_CHARFROMPOS,(WPARAM)0,(LPARAM)&point);
int CharPostrion = HIWORD(dEditcontrol);
int CharPo = LOWORD(dEditcontrol);

What I have tried:

Can Some Body suggest why i am getting Result as (65535, 65535)
in CharPostrion and CharPro.

Posted 17-Jun-20 2:20am

Cool Dude-P

Updated 30-Jun-20 14:56pm

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2 solutions

Solution 1

Most likely because the co-ordinates in the point structure are outside of the client Window. You need to convert them from screen to client co-ordinates. See the references: GetCursorPos function (winuser.h) - Win32 apps | Microsoft Docs[^] and EM_CHARFROMPOS message (Winuser.h) - Win32 apps | Microsoft Docs[^].

Posted 17-Jun-20 3:02am

Richard MacCutchan

Comments

Cool Dude-P 17-Jun-20 23:38pm

CRect rc;
CPoint point;
::GetCursorPos(&point);

CEdit* pt = (CEdit*)GetDlgItem(IDC_SOMEID);
pt->GetWindowRect(&rc);
pt->ScreenToClient(rc);

DWORD dEditcontrol = pt->SendMessage(EM_CHARFROMPOS,(WPARAM)0,(LPARAM)&point);
int CharPostrion = HIWORD(dEditcontrol);
int CharPo = LOWORD(dEditcontrol);

Still getting same Result as (65535, 65535)

Richard MacCutchan 18-Jun-20 5:02am

You are calling ScreenToClient on the wrong values, it needs to be passed the point structure from GetCursorPos. See CWnd Class | Microsoft Docs[^].

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Yofoo · Accepted Answer · 2020-06-30T14:56:00

Solution 3

EM_CHARFROMPOS message lParam should 4 Byte, CPoint is 8 Byte

MAKELPARAM(x, y);    //use this to replace CPoint

Posted 30-Jun-20 14:56pm

Yofoo