An issue with GetDlgItemInt and SetDlgItemInt

Question

Please observe the following code:

double rate=GetDlgItemInt(IDC_EDIT1,0,TRUE); double term=GetDlgItemInt(IDC_EDIT2,0,TRUE); double amount=GetDlgItemInt(IDC_EDIT3,0,TRUE); double final;

CString Content(_T("Thanks for using the calculator"));
if (CTaskDialog::IsSupported())
{
CString Heading(_T("Successfully calculated"));
CString Title(_T("Interest Calculator"));
CString Collapsed(_T("Collapsed Info"));
CString Expanded(_T("Expanded Info"));
CString Information(_T("Your information you want to calculate"));
CTaskDialog dia(Content,Heading,Title,TDCBF_OK_BUTTON);

final=amount*pow((1+rate),term);
SetDlgItemInt(IDC_EDIT4,final,FALSE);
dia.SetMainIcon(TD_ERROR_ICON);
dia.DoModal();
}

}

What I have tried to do is to create a GUI for a calculator which calculates the future value of a fund. I want to have all the variables as doubles. But the part of the code "GetDlgItemInt" is clearly meant for integers and I do not know how to alter it to get a double. Please help me with this. Thanks in advance.

Use `GetDlgItemText()` function and than convert received text to a double. — Vasily Biryukov, Nov 12 '13 at 05:57
Read [this](http://stackoverflow.com/questions/392981/how-can-i-convert-string-to-double-in-c) SO question. — Vasily Biryukov, Nov 12 '13 at 06:02

score 1 · Answer 1 · answered Nov 12 '13 at 07:06

An equivalent function that returns a double could be:

double GetDlgItemDouble(HWND hWnd, UINT uId)
{
    TCHAR tchBuf[80];
    GetDlgItemText(hWnd, uId, tchBuf, 80);
    return _ttof(tchBuf);
}

You may want to add error checking in case the string contains non-numeric characters, etc.

Niyaz Ivanov · Answer 2 · 2013-11-12T06:18:52.353

0

~~Isn't it better storing those values as CTaskDialog members?~~
(Sorry forgot what G(S)etDlgItem did)

You can do

float myFloat = 3.2;

CString text;
text.Format( L"%f", myFloat );

SetDlgItemText( yourID, text );

edited Nov 12 '13 at 06:18

answered Nov 12 '13 at 06:01

Niyaz Ivanov

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An issue with GetDlgItemInt and SetDlgItemInt

2 Answers2