Reading in from a dialog box

Hello,

I am just writing a silly little application to add two numbers together, but I am not sure how to read in from the edit control boxes.

I have been trying to do it this was

Code:

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int var1, var2;
var1 = IDC_EDIT1->Text;
var2 = IDC_EDIT2->Text;
MessageBox::Show((var1+var2).ToString());

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But I am getting errors. Hopefully someone can help me out. Or point me to where on the MS site I can get some help.

Thanks.

Seán

You need to explicitly convert the strings to type int before assigning them to the int variables. A common tool to use for that is the int::Parse() method.

EDIT: Errr, wait... IDC_EDIT1 looks like a control ID like they are used in native C++ with MFC or Win API. Do you actually use .NET types here, i.e. are the text boxes of type System::Windows::Forms::TextBox? Otherwise they most likely wouldn't have a Text property anyway...

Hello,

Thanks for the reply. I have tried a different approach, but got a new issue. Hopefully someone can help.

Here is the code

Code:

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{
        CString myEdit1;
        char a;
        int i;
        const int KEY = 23;       
        this -> GetDlgItemText(IDC_EDIT1, myEdit1);
        int length = myEdit1.GetLength();
        char *p = myEdit1.GetBuffer();

        for (i = 0; i < length; i++)
        {
                *(p + i) = (*(p + i) ^ KEY);
        }
        a = (char)*(p+1);

        SetDlgItemText(IDC_EDIT2, a);
}

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And I am getting an error "error C2664: 'CWnd::SetDlgItemTextA' : cannot convert parameter 2 from 'char' to 'LPCTSTR' ...Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast"

I am not sure how to sort this out. Hopefully someone can help.

Thanks in advance.

Seán

Quote:

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Originally Posted by o.fithcheallaigh

I have tried a different approach [...].

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Obviously. Now that defininitely is native C++ with MFC, so there's no such thing as a Text property or MessageBox::Show() or int::ToString() methods. Questions about that should better be asked in the Visual C++ section.

Quote:

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And I am getting an error "error C2664: 'CWnd::SetDlgItemTextA' : cannot convert parameter 2 from 'char' to 'LPCTSTR' ...Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast"

---

The error message is rather obvious, I'd say: The method expects an LPCTSTR, which is a synonym for either char * or wchar_t *, depending on whether it's an MBCS or Unicode build. A char isn't implicitly convertible into that (and it's definitely better that it is that way - comment by me, not the error message :)).

This could serve as a quick and dirty fix:

Code:

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        char a[2] = {0};

        // ...

        a[0] = (char)*(p+1);

        SetDlgItemText(IDC_EDIT2, a);

---

Quote:

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Now that defininitely is native C++ with MFC, so there's no such thing as a Text property or MessageBox::Show() or int::ToString() methods. Questions about that should better be asked in the Visual C++ section.

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I did start off asking my questions there, but I was told to come here.

Quote:

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The error message is rather obvious

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I am afraid it wasn't to me :) ...and that is why I have come here to try and get help, and learn.

Quote:

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I'd say: The method expects an LPCTSTR, which is a synonym for either char * or wchar_t *, depending on whether it's an MBCS or Unicode build. A char isn't implicitly convertible into that (and it's definitely better that it is that way - comment by me, not the error message :)).

This could serve as a quick and dirty fix:

Code:

---

        char a[2] = {0};

        // ...

        a[0] = (char)*(p+1);

        SetDlgItemText(IDC_EDIT2, a);

---

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Thanks a lot, I will give that a go.

That did the trick!

Again, thanks!

Seán