Thread: Edit Control

If you read the msdn page that anonytmouse helpfully provided a link to, you should notice that, generally, it's:

Code:

SendMessage(wnd_handle,EM_SETSEL,start position,end position);

or, for your specific example:

Code:

 SendMessage( GetDlgItem(hDlg, IDC_EDIT2), EM_SETSEL, 4,5 );

Thankyou for providing the link.

The article you have linked to is actually out of date with respect to the EM_SETSEL message (it may be in other respects; I haven't checked); if EM_SETSEL is used as described in that page then the behaviour you observe occurs because the text selection start position is zero and the end position is the result of the MAKELONG/MAKELPARAM macro.

I can only assure you that if you use the message as I have previously described then it will highlight the single character as you have requested.

BTW, a more up-to-date reference for edit controls can be found here:

http://msdn.microsoft.com/library/de...itcontrols.asp

Originally Posted by BobS0327

The Makelong is just a macro that does essentially the same thing.

No it dosen't.

Code:

EM_SETSEL 
wParam = (WPARAM) (INT) nStart;    // starting position 
lParam = (LPARAM) (INT) nEnd;      // ending position

EM_SETSEL expects the starting address (a long value) to be the wParam argument and the ending address to be the lParam argument.
MAKELONG packs the 2 values into one long value and you have used them as the lParam argument.

For completeness, here's a small example that displays 0123456789 in an edit and highlights the fifth character, '4':

Code:

#include <windows.h>
#include <tchar.h>

LRESULT CALLBACK WndProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
static HWND hEdit;
switch (uMsg)
  {
  case WM_CREATE:
    hEdit=CreateWindowEx(WS_EX_CLIENTEDGE,_T("edit"),_T("0123456789"),
                         WS_CHILD|WS_VISIBLE,
                         10,10,200,30,hwnd,0,GetModuleHandle(0),0);
    /*highlight 5th character*/
    SendMessage(hEdit,EM_SETSEL,4,5); 
    SetFocus(hEdit);
    return 0;
  case WM_DESTROY:
    PostQuitMessage(0);
    return 0;
  default:
    return DefWindowProc(hwnd,uMsg,wParam,lParam);
  }
}

int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrev,LPSTR pStr,int nCmd)
{
HWND       hwnd;
MSG        msg;
TCHAR      classname[]=_T("kenf's_wnd");
WNDCLASSEX wcx={0};

wcx.cbSize       =sizeof(wcx); 
wcx.lpfnWndProc  =WndProc; 
wcx.hInstance    =hInst; 
wcx.hIcon        =(HICON)LoadImage(0,IDI_APPLICATION,IMAGE_ICON,0, 0,LR_SHARED); 
wcx.hCursor      =(HCURSOR)LoadImage(0,IDC_ARROW,IMAGE_CURSOR,0,0, LR_SHARED);
wcx.hbrBackground=(HBRUSH)(COLOR_BTNFACE+1); 
wcx.lpszClassName=classname; 

if (RegisterClassEx(&wcx))
  {
  hwnd=CreateWindowEx(0,classname,
                      _T("Highlight Single Character in Edit Control"),
                      WS_OVERLAPPEDWINDOW,
                      GetSystemMetrics(SM_CXSCREEN)/4,
                      GetSystemMetrics(SM_CYSCREEN)/4,
                      GetSystemMetrics(SM_CXSCREEN)/2,
                      GetSystemMetrics(SM_CYSCREEN)/2,
                      0,0,hInst,0);
  if (hwnd)
    {
    ShowWindow(hwnd,nCmd);
    UpdateWindow(hwnd);
    
    while (GetMessage(&msg,0,0,0)>0)
      {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
      }
    return msg.wParam;
    }
  else
    {
    MessageBox(0,_T("Wnd creation failure"),_T("Error"),MB_OK|MB_ICONERROR);
    return 0;
    }
  }
MessageBox(0,_T("Wnd registration failure"),_T("Error"),MB_OK|MB_ICONERROR);
return 0;
}

Hope that's of some use to you.