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2kaud is right.
Sorry for non/correct reply. Just was too lazy to look at the docs. :blush:

If both dialogs work with the same port then, perhaps, in the main dialog.

Well I alreadi showed you how to convert text to double (it will work if your CString contains a text representation of the double value, something like "12345.67890".)

I cannot help you without seeing your actual code.

If *your* m_Voltin is of a CString type and it contains a text corresponding some double variable then
double dbl = _tcstod(m_Voltin);

Sure it is incorrect. Because you defined it wrong (or you passed in the wrong parameter):


Please have a look at the code example that Skizmo has provided you in the post#4. :cool: