Visual Basic Programming Code Examples

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Creating A Percentage Done Status Display



Creating A Percentage Done Status Display

'This is the API we will be using.
Private Declare Function BitBlt Lib "GDI32" _
 (ByVal hDestDC As Integer, ByVal X As Integer, _
 ByVal Y As Integer, ByVal nWidth As Integer, _
 ByVal nHeight As Integer, ByVal hSrcDC As Integer, _
 ByVal XSrc As Integer, ByVal YSrc As Integer, _
 ByVal dwRop As Long) As Integer

'Dimension a variable.
Dim tenth As Long


'This function updates the status bar by a
'certain amount (specified as a perecntage).
Sub UpdateStatus(Amount As Long)
    'Dimension some variables.
    Static progress As Long
    Const SRCCOPY = &HCC0020
    Dim Txt$
    
    'Update the status bar.
    progress = progress + Amount
    
    If progress > Picture1.ScaleWidth Then
        progress = Picture1.ScaleWidth
    End If
    
    Txt$ = Format$(CLng((progress / Picture1.ScaleWidth) * 100)) + "%"
    Picture1.Cls
    Picture1.CurrentX = (Picture1.ScaleWidth - Picture1.TextWidth(Txt$)) \ 2
    Picture1.CurrentY = (Picture1.ScaleHeight - Picture1.TextHeight(Txt$)) \ 2
    Picture1.Print Txt$
    Picture1.Line (0, 0)-(progress, Picture1.ScaleHeight), Picture1.ForeColor, BF
    r = BitBlt(Picture1.hDC, 0, 0, Picture1.ScaleWidth, Picture1.ScaleHeight, _
     Picture1.hDC, 0, 0, SRCCOPY)
End Sub

Private Sub Form_Load()
    Picture1.AutoRedraw = True
    Picture1.BackColor = &H80000003
    Picture1.DrawMode = 10
    Picture1.FillStyle = 0
    Picture1.ForeColor = &H80
End Sub

Private Sub Command1_Click()
    Picture1.ScaleWidth = 109
    tenth = 10
    For i = 1 To 11
        Call UpdateStatus(tenth)
        X = Timer
        While Timer < X + 0.75
            DoEvents
        Wend
    Next
End Sub