EncryptedPackageEnvelope.IsEncryptedPackageEnvelope 方法

定义

命名空间:

System.IO.Packaging

程序集:

WindowsBase.dll

获取一个值，该值指示文件是否为具有加密包流的 OLE 复合文件。

重载

IsEncryptedPackageEnvelope(Stream)	获取一个值，该值指示指定的流是否为具有加密包流的 OLE 复合文件。
IsEncryptedPackageEnvelope(String)	获取一个值，该值指示指定的文件是否为具有加密包流的 OLE 复合文件。

IsEncryptedPackageEnvelope(Stream)

获取一个值，该值指示指定的流是否为具有加密包流的 OLE 复合文件。

public:
 static bool IsEncryptedPackageEnvelope(System::IO::Stream ^ stream);

public static bool IsEncryptedPackageEnvelope (System.IO.Stream stream);

static member IsEncryptedPackageEnvelope : System.IO.Stream -> bool

Public Shared Function IsEncryptedPackageEnvelope (stream As Stream) As Boolean

参数

stream

Stream

所测试的流。

返回

Boolean

如果指定的流是具有加密包流的 OLE 复合文件，则为 true；否则，为 false。

例外

ArgumentNullException

stream 为 null。

IsEncryptedPackageEnvelope(String)

获取一个值，该值指示指定的文件是否为具有加密包流的 OLE 复合文件。

public:
 static bool IsEncryptedPackageEnvelope(System::String ^ fileName);

public static bool IsEncryptedPackageEnvelope (string fileName);

static member IsEncryptedPackageEnvelope : string -> bool

Public Shared Function IsEncryptedPackageEnvelope (fileName As String) As Boolean

参数

fileName

String

所测试的文件。

返回

Boolean

如果指定的文件是具有加密包流的 OLE 复合文件，则为 true；否则，为 false。

例外

ArgumentNullException

fileName 为 null。

示例

以下示例演示如何使用此方法测试加密。

WriteStatus("   Signing the UnsignedPublishLicense\n" +
            "       to build the PublishLicense.");
UseLicense authorsUseLicense;
PublishLicense publishLicense =
    unsignedLicense.Sign(_secureEnv, out authorsUseLicense);

WriteStatus("   Binding the author's UseLicense and");
WriteStatus("       obtaining the CryptoProvider.");
CryptoProvider cryptoProvider = authorsUseLicense.Bind(_secureEnv);

WriteStatus("   Creating the EncryptedPackage.");
Stream packageStream = File.OpenRead(packageFile);
EncryptedPackageEnvelope ePackage =
    EncryptedPackageEnvelope.CreateFromPackage(encryptedFile,
        packageStream, publishLicense, cryptoProvider);

WriteStatus("   Adding an author's UseLicense.");
RightsManagementInformation rmi =
    ePackage.RightsManagementInformation;
rmi.SaveUseLicense(author, authorsUseLicense);

ePackage.Close();
WriteStatus("   Done - Package encryption complete.");

WriteStatus("Verifying package encryption.");
if (EncryptedPackageEnvelope.IsEncryptedPackageEnvelope(encryptedFile))
{
    WriteStatus("   Confirmed - '" + encryptedFilename +
                "' is encrypted.");
}
else
{
    MessageBox.Show("ERROR: '" + encryptedFilename +
        "' is NOT ENCRYPTED.", "Encryption Error",
        MessageBoxButton.OK, MessageBoxImage.Error);
    WriteStatus("ERROR: '" + encryptedFilename +
                "' is NOT ENCRYPTED.\n");
    return false;
}

WriteStatus("   Signing the UnsignedPublishLicense" & vbLf & "       to build the PublishLicense.")
Dim authorsUseLicense As UseLicense = Nothing
Dim publishLicense As PublishLicense = unsignedLicense.Sign(_secureEnv, authorsUseLicense)

WriteStatus("   Binding the author's UseLicense and")
WriteStatus("       obtaining the CryptoProvider.")
Dim cryptoProvider As CryptoProvider = authorsUseLicense.Bind(_secureEnv)

WriteStatus("   Creating the EncryptedPackage.")
Dim packageStream As Stream = File.OpenRead(packageFile)
Dim ePackage As EncryptedPackageEnvelope = EncryptedPackageEnvelope.CreateFromPackage(encryptedFile, packageStream, publishLicense, cryptoProvider)

WriteStatus("   Adding an author's UseLicense.")
Dim rmi As RightsManagementInformation = ePackage.RightsManagementInformation
rmi.SaveUseLicense(author, authorsUseLicense)

ePackage.Close()
WriteStatus("   Done - Package encryption complete.")

WriteStatus("Verifying package encryption.")
If EncryptedPackageEnvelope.IsEncryptedPackageEnvelope(encryptedFile) Then
    WriteStatus("   Confirmed - '" & encryptedFilename & "' is encrypted.")
Else
    MessageBox.Show("ERROR: '" & encryptedFilename & "' is NOT ENCRYPTED.", "Encryption Error", MessageBoxButton.OK, MessageBoxImage.Error)
    WriteStatus("ERROR: '" & encryptedFilename & "' is NOT ENCRYPTED." & vbLf)
    Return False
End If