QTP可以通过DotNetFactory.CreateInstance 来创建.NET自带的类库实例并使用其方法。
以下示例代码展示，如何.ne t中的System.Drawing命名空间中的类来转换图片格式。view plaincopy to clipboardprint?
'Convert image from one format to the another format
Public Function ConvertImage(ByVal fromFile, ByVal toFile)
Dim oImageLib ' as System.Drawing.Image
'Create the .NET image object
Set ImageLib = DotNetFactory.CreateInstance("System.Drawing.Image")
Dim oImage
'Get the Image from file
Set Image = oImageLib.FromFile(fromFile)
'Convert the file
oImage.Save toFile, GetImageFormat(toFile)
'Destroy the image
oImage.Dispose
'Clean up objects
Set Image = Nothing
Set ImageLib = Nothing
Set ImageFormats = Nothing
End Function
Public Function GetImageFormat(byVal fileName)
'Get the file extension from the destination file name
'Pass a dummy Nothing parameter to the constructor in place of Guid
Set ImageFormats = DotNetFactory.CreateInstance ("System.Drawing.Imaging.ImageFormat","System.Drawing", Nothing)
newFileExtension = GetFileExtension(lcase(fileName))
'Get the image format based on the file name
Select Case newFileExtension
Case "jpg", "jpeg"
Set NewImgFormat = oImageFormats.Jpeg
Case "gif"
Set NewImgFormat = oImageFormats.gif
Case "tiff"
Set NewImgFormat = oImageFormats.Tiff
Case "wmf"
Set NewImgFormat = oImageFormats.wmf
Case "emf"
Set NewImgFormat = oImageFormats.emf
Case "exif"
Set NewImgFormat = oImageFormats.Exif
Case "bmp"
Set NewImgFormat = oImageFormats.Bmp
Case "png"
Set NewImgFormat = oImageFormats.Png
Case Else
Set NewImgFormat = oImageFormats.Png
End Select
Set GetImageFormat = oNewImgFormat
Set ImageFormats = Nothing
End Function
'Get the file extenstion of a given file name
Public Function GetFileExtension(ByVal FileName)
lastDot = InStrRev(FileName,".")
If lastDot Then
GetFileExtension = Mid(FileName, lastDot + 1)
Else
GetFileExtension = ""
End If
End Function
'Convert image from one format to the another format
Public Function ConvertImage(ByVal fromFile, ByVal toFile)
Dim oImageLib ' as System.Drawing.Image
'Create the .NET image object
Set ImageLib = DotNetFactory.CreateInstance("System.Drawing.Image")
Dim oImage
'Get the Image from file
Set Image = oImageLib.FromFile(fromFile)
'Convert the file
oImage.Save toFile, GetImageFormat(toFile)
'Destroy the image
oImage.Dispose
'Clean up objects
Set Image = Nothing
Set ImageLib = Nothing
Set ImageFormats = Nothing
End Function
Public Function GetImageFormat(byVal fileName)
'Get the file extension from the destination file name
'Pass a dummy Nothing parameter to the constructor in place of Guid
Set ImageFormats = DotNetFactory.CreateInstance ("System.Drawing.Imaging.ImageFormat","System.Drawing", Nothing)
newFileExtension = GetFileExtension(lcase(fileName))
'Get the image format based on the file name
Select Case newFileExtension
Case "jpg", "jpeg"
Set NewImgFormat = oImageFormats.Jpeg
Case "gif"
Set NewImgFormat = oImageFormats.gif
Case "tiff"
Set NewImgFormat = oImageFormats.Tiff
Case "wmf"
Set NewImgFormat = oImageFormats.wmf
Case "emf"
Set NewImgFormat = oImageFormats.emf
Case "exif"
Set NewImgFormat = oImageFormats.Exif
Case "bmp"
Set NewImgFormat = oImageFormats.Bmp
Case "png"
Set NewImgFormat = oImageFormats.Png
Case Else
Set NewImgFormat = oImageFormats.Png
End Select
Set GetImageFormat = oNewImgFormat
Set ImageFormats = Nothing
End Function
'Get the file extenstion of a given file name
Public Function GetFileExtension(ByVal FileName)
lastDot = InStrRev(FileName,".")
If lastDot Then
GetFileExtension = Mid(FileName, lastDot + 1)
Else
GetFileExtension = ""
End If
End Function
范例代码：
ConvertImage "c:\test.bmp","c:\test.jpg"
运行结果，将c盘下的test.bmp转换成jpg格式。
