WMRMProtect.WriteFile
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WMRMProtect.WriteFile
The WriteFile method writes an encrypted file with an updated content header.
Syntax
WMRMProtect .WriteFile( bstrFileName )
Parameters
bstrFileName
[in] String containing the path and name of the encrypted output file to be generated.
Return Values
If the method succeeds, it returns S_OK. If it fails, it returns a number in the error object.
| Return code | Description |
| 0x80004005 | An unspecified error occurred. |
| 0x80070057 | The specified parameter is not valid. |
Remarks
Only the header is updated. The remainder of the file is unchanged.
Example Code
Dim sKID, sCID, sSeed, sKey, sHeader
Dim sPrivKey, sPubKey
Dim HeaderObj
Dim KeysObj
Dim ProtectObj
' Create objects.
Set HeaderObj = Server.CreateObject("Wmrmobjs.WMRMHeader")
Set KeysObj = Server.CreateObject("Wmrmobjs.WMRMKeys")
Set ProtectObj = Server.CreateObject("Wmrmobjs.WMRMProtect")
' Replace XXX with the packaging server's private key.
= "XXX"
' Sign the header.
' Retrieve the string containing the header.
sHeader = HeaderObj.Header
' Set the header string into the WMRMProtect object.
ProtectObj.Header = sHeader
' Set the key into the WMRMProtect object.
ProtectObj.Key = sKey
' Specify the name of the file to be protected.
ProtectObj.InputFile = "c:\input_file.wmv"
' Generate a protected file.
ProtectObj.ProtectFile("c:\output_file_1.wmv")
' If you change the header, you can use the WriteFile()
' method to update the protected file without forcing
' Windows Media Rights Manager to again encrypt the
' content. For example, the following illustrates how
' to protect the file after adding attributes to the header.
ProtectObj.InputFile=("C:\output_file_1.wmv")
HeaderObj.Header = ProtectObj.Header
HeaderObj.Attribute("Author") = "name of the author"
HeaderObj.Attribute("ContentDistributor") = "name of the distributor"
ProtectObj.Header = HeaderObj.Header
ProtectObj.WriteFile("c:\output_file_2.wmv")
Requirements
Version: Windows Media Rights Manager 7 SDK or later
Reference: wmrmobjs 1.0 Type Library
Library: wmrmobjs.dll
Platform: Windows Server 2003
See Also
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