Question:You write the following code segment to call a function from the Win32 Application Programming Interface (API) by using platform invoke.
Dim PersonName as String = "N?el"
Dim Msg as String = "Welcome " + PersonName + " to club ''!"
Dim r As Boolean= User32API.MessageBox(0, Msg, PersonName, 0)
You need to define a method prototype that can best marshal the string data.
Which code segment should you use?
 

A <DllImport("user32", EntryPoint:="MessageBoxA", _ 
"A Composite Solution With Just One Click" - Certification Guaranteed 185 Microsoft 70-536 Exam CharSet:=CharSet.Ansi)> _ 
Public Function MessageBox(ByVal hWnd As Int32, _ 
<MarshalAs(UnmanagedType.LPWStr)> ByVal text As String, _ <MarshalAs(UnmanagedType.LPWStr) > ByVal caption As String, _ ByVal t As UInt32) As Boolean 
End Function 
B DllImport("user32", EntryPoint:="MessageBoxA", _
CharSet:=CharSet.Unicode)> _ 
Public Function MessageBox(ByVal hWnd As Int32, _ 
<MarshalAs(UnmanagedType.LPWStr)> 
ByVal text As String, _ <MarshalAs(UnmanagedType.LPWStr) > 
ByVal caption As String, _ ByVal t As UInt32) As Boolean 
End Function 
C <DllImport("user32", CharSet:=CharSet.Unicode)> _ 
Public Function MessageBox(ByVal hWnd As Int32, _ ByVal text As String, 
ByVal caption As String, _ ByVal t As UInt32) As Boolean 
End Function 
D <DllImport("user32", CharSet:=CharSet.Ansi)> _ 
Public Function MessageBox(ByVal hWnd As Int32, _ 
ByVal text As String, ByVal caption As String, _ 
ByVal t As UInt32) As Boolean 
End Function 

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C 

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Mohammad Towhidul Islam

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