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private sub commandbutton1_click()
dim vb6dll as object
dim vb6functionreturnvalue as long
dim xlength as double, ylength as double, zlength as double
on error goto overflow
if not (isnumeric(textbox1.text)) then
msgbox "the x length must be numeric!", vbexclamation
textbox1.setfocus
exit sub
end if
xlength = cdbl(textbox1.text)
if not (isnumeric(textbox2.text)) then
msgbox "the y length must be numeric!", vbexclamation
textbox2.setfocus
exit sub
end if
ylength = cdbl(textbox2.text)
if not (isnumeric(textbox3.text)) then
msgbox "the z length must be numeric!", vbexclamation
textbox3.setfocus
exit sub
end if
zlength = cdbl(textbox3.text)
on error goto errortrap
set vb6dll = thisdrawing.application.getinterfaceobject("externalfunction.dll")
vb6functionreturnvalue = vb6dll.cubevolume(xlength, ylength, zlength)
textbox4.text = vb6functionreturnvalue
exit sub
errortrap:
msgbox "an error was generated. the error description is:" & err.description, vbexclamation
exit sub
overflow:
msgbox "one of the lengths entered is too large,please try again.", vbexclamation
exit sub
end sub
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public function cubevolume(xlength as double, ylength as double, zlength as double) as double
cubevolume = xlength * ylength * zlength
end function
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