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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
May 19, 2001

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WriteToStdOutput - Write to standard output stream

Option Explicit

Private Declare Function GetStdHandle Lib "kernel32" (ByVal nStdHandle As Long) _
    As Long
Private Declare Function WriteFile Lib "kernel32" (ByVal hFile As Long, _
    lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, _
    lpNumberOfBytesWritten As Long, lpOverlapped As Any) As Long

Private Const STD_OUTPUT_HANDLE = -11&

' write to standard output channel
'
' NOTE: this routine works only in compiled applications

Sub WriteToStdOutput(ByVal Text As String)
    Dim hStdOut As Long
    Dim ret As Long
    Dim bytesWritten As Long
    
    ' get the handle of standard output
    hStdOut = GetStdHandle(STD_OUTPUT_HANDLE)
    
    ' write to standard output
    ret = WriteFile(hStdOut, ByVal Text, Len(Text), bytesWritten, ByVal 0&)
    
    ' deal with errors
    If ret = 0 Then
        Err.Raise 1001, , "Unable to write to standard output"
    ElseIf bytesWritten < Len(Text) Then
        Err.Raise 1002, , "Incomplete write operation"
    End If
End Sub

Francesco Balena
 
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