Generate image verification code functions

xiaoxiao2021-03-06  106

'Generate image verification code functions

Sub Validatecode (Byval Vnum As String)

DIM IMG as system.drawing.bitmap

DIM G As Graphics

DIM MS as system.io.MemoryStream

'Gheight is the width, automatically change image width according to character length

DIM GHEIGHT AS INTEGER = INT (LEN (VNUM) * 11.5)

'Creating a width of a width, a height of 20

IMG = New Bitmap (Gheight, 20)

g = graphics.fromImage (IMG)

'Draw strings in the rectangular shape (string, font, brush color, on the left X. Top left y)

g.drawstring (VNUM, NEW FONT ("Song Body", 12)), (New Solidbrush), 3, 3)

MS = new system.io.MemoryStream

IMG.SAVE (MS, System.drawing.Image.ImageFormat.png)

Response.clearContent () 'Requires Output Image Information To modify http headers

Response.contentType = "image / png"

Response.binaryWrite (ms.toarray ())

g.dispose ()

IMG.Dispose ()

Response.end ()

End Sub

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