'以下在.Bas
Option Explicit
Declare Function StretchBlt Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, _
        ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, _
        ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long

Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long

Const SRCCOPY = &HCC0020

Public Sub DrawBitMap(Dst As Object, ByVal xRate As Double, _
		       ByVal yRate As Double, ByVal FileName As String)
Dim dstWidth As Long, dstHeight As Long
Dim srcWidth As Long, srcHeight As Long
Dim x As Long, y As Long
Dim pic As StdPicture
Dim hDc5 As Long, i As Long

Set pic = LoadPicture(FileName) '读取图形档

hDc5 = CreateCompatibleDC(0) '建立Memory DC
i = SelectObject(hDc5, pic.Handle) '在该memoryDC上放上bitmap图

srcHeight = Dst.ScaleY(pic.Height, vbHimetric, vbPixels)
srcWidth = Dst.ScaleX(pic.Width, vbHimetric, vbPixels)

dstHeight = CLng(srcHeight * yRate)
If dstHeight < 0 Then
   y = -1 * dstHeight
Else
   y = 0
End If
dstWidth = CLng(srcWidth * xRate)
If dstWidth < 0 Then
   x = -1 * dstWidth
Else
   x = 0
End If
Call StretchBlt(Dst.hdc, x, y, dstWidth, dstHeight, hDc5, 0, 0, srcWidth, srcHeight, SRCCOPY)
Call DeleteDC(hDc5)
End Sub


Public Sub DrawPicture(Dst As Object, ByVal xRate As Double, _
               ByVal yRate As Double, ByVal FileName As String)
Dim dstWidth As Long, dstHeight As Long
Dim srcWidth As Long, srcHeight As Long
Dim x As Long, y As Long
Dim pic As StdPicture
Dim i As Long

Set pic = LoadPicture(FileName) '读取图形档

srcHeight = Dst.ScaleY(pic.Height, vbHimetric, vbPixels)
srcWidth = Dst.ScaleX(pic.Width, vbHimetric, vbPixels)

dstHeight = CLng(srcHeight * yRate)
If dstHeight < 0 Then
   y = -1 * dstHeight
Else
   y = 0
End If
dstWidth = CLng(srcWidth * xRate)
If dstWidth < 0 Then
   x = -1 * dstWidth
Else
   x = 0
End If
Dst.ScaleMode = 3
Dst.PaintPicture pic, x, y, dstWidth, dstHeight, 0, 0, srcWidth, srcHeight

End Sub


'以下在Form需两个command button一个PictureBox
Private Sub Command1_Click()
Call DrawBitMap(Me, 1.5, -1.5, "c:\windows\circles.bmp") '放大1.5倍并上下翻转
End Sub

Private Sub Command2_Click()
Call DrawBitMap(Picture1, 1.5, -1.5, "c:\windows\client.ico") '放大1.5倍并上下翻转
End Sub