Question:You write the following code to call a function from the Win32 Application Programming Interface (API) by using platform invoke.
Dim r As Integer = MessageBox(hWnd, strText, strCaption, strType)
You need to define a method prototype.
Which code segment should you use?
 

A <DllImport("user32")>_ 
Function MessageBox( _
ByVal hWnd As IntPtr, ByVal text As String, _ 
ByVal Caption As String, ByVal t As UInt32) As Integer End Function 
B <DllImport("C:\WINDOWS\system32\user32.dll ")>_ 
Function MessageBox( _ 
ByVal hWnd As IntPtr, ByVal text As String, _ 
ByVal Caption As String, ByVal t As UInt32) As Integer End Function 
C <DllImport("user32")>_ 
Function Win32API_User32_MessageBox ( _ 
ByVal hWnd As IntPtr, ByVal text As String, _ 
ByVal Caption As String, ByVal t As UInt32) As Integer End Function 
D <DllImport("user32")>_ 
Function MessageBoxA( _ 
ByVal hWnd As IntPtr, ByVal text As String, _ 
ByVal Caption As String, ByVal t As UInt32) As Integer End Function 

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A 

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Mohammad Towhidul Islam

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