'测试图片文件是否为JPG或JPEG文件(与文件扩展名无关)'参数说明:Filename 要测试的图片文件名,返回值为逻辑型'调用举例:if TestJpgFile("c:\1.jpg")=True then msgbox "是JPG文件"Function TestJpgFile(Filename As String) As BooleanDim i As Integer, S As String, bb() As ByteIf Dir(Filename) = "" Or Filename = "" Then Exit Functioni = FreeFileReDim bb(9)Open Filename For Bi
Private Function IsJPGFile(ByVal FileName As String) As BooleanConst STR1 As String = "FFD8FFE0????????4946"Dim ByteD() As Byte, FileL As Long, I As LongDim STR2 As Str