利用API 实现字符串的镜像(一)

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博客展示了VB代码中StretchBlt函数的使用。定义了StretchBlt函数，设置了常量和图片框控件。在Form_Load事件中初始化界面，在Form_Click事件里对图片框进行文字输出，并使用StretchBlt函数实现镜像效果。

Private 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
Private Const SRCCOPY = &HCC0020
Private WithEvents pic1 As PictureBox
Private WithEvents pic2 As PictureBox

Sub Form_Load()
Me.Move 0, 0, 10200, 4000
Set pic1 = Controls.Add("vb.picturebox", "pic1", Me)
pic1.Visible = True
pic1.Move 0, 0, 5000, 2500
Set pic2 = Controls.Add("vb.picturebox", "pic2", Me)
pic2.Visible = True
pic2.Move 5000, 0, 5000, 2500
pic1.ScaleMode = 3
pic2.ScaleMode = 3
End Sub

Sub Form_Click()
pic2.CurrentX = 0
pic2.CurrentY = 0
pic2.FontSize = 120
pic2.ForeColor = vbRed
pic2.FontName = "隶书"
pic2.Print "镜像"
StretchBlt pic1.hdc, pic2.ScaleWidth, 0, -pic2.ScaleWidth, pic2.ScaleHeight, pic2.hdc, 0, 0, pic2.ScaleWidth, pic2.ScaleHeight, SRCCOPY
End Sub