CODEWITHSUNDEEP
c++mfcmodal-dialog
pasquers
pasquers

Reputation: 792

CDialog update input box value

I am working with CDialogs and mfc. My dialog loads, and there are two input boxes and a button. When i click the button I want to have the values in the input boxes change. My current attempt is this

void
CInstanceNumberDlg::updateLeftRange(int i) {
GetDlgItem(IDC_2NDDERIV_WT)->SetWindowText((LPCTSTR)i);
UpdateData(false);
UpdateWindow();
}

I have also tried with other combinations of including UpdateData() and UpdateWindow(). This method is being reached with a valid integer, and that ID should be valid.

How can i get the value in the input box to be modified?

Thank you

Upvotes: 0

Views: 349

Answers (1)

Jim Rhodes
Jim Rhodes

Reputation: 5085

Your problem is this line:

GetDlgItem(IDC_2NDDERIV_WT)->SetWindowText((LPCTSTR)i);

i is not a pointer to a string and so you should not be casting it to an LPCTSTR. What you need to do convert the value of i to a string and then pass a pointer to the resulting string to SetWindowText(). And I don't believe you need UpdateData() or UpdateWindow(). For example:

void CInstanceNumberDlg::updateLeftRange(int i)
{
  TCHAR tszValue[32];

  StringCchPrintf(tszValue, _countof(tszValue), TEXT("%d"), i);
  GetDlgItem(IDC_2NDDERIV_WT)->SetWindowText(tszValue);
}

Upvotes: 1

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