FromBase64Transform Class
Converts a CryptoStream from base 64.
Assembly: mscorlib (in mscorlib.dll)
| Name | Description | |
|---|---|---|
![]() | FromBase64Transform() | Initializes a new instance of the FromBase64Transform class. |
![]() | FromBase64Transform(FromBase64TransformMode) | Initializes a new instance of the FromBase64Transform class with the specified transformation mode. |
| Name | Description | |
|---|---|---|
![]() | CanReuseTransform | Gets a value indicating whether the current transform can be reused. |
![]() | CanTransformMultipleBlocks | Gets a value that indicates whether multiple blocks can be transformed. |
![]() | InputBlockSize | Gets the input block size. |
![]() | OutputBlockSize | Gets the output block size. |
| Name | Description | |
|---|---|---|
![]() | Clear() | Releases all resources used by the FromBase64Transform. |
![]() | Dispose() | Releases all resources used by the current instance of the FromBase64Transform class. |
![]() | Dispose(Boolean) | Releases the unmanaged resources used by the FromBase64Transform and optionally releases the managed resources. |
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Releases the unmanaged resources used by the FromBase64Transform.(Overrides Object::Finalize().) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
![]() | TransformBlock(array<Byte>^, Int32, Int32, array<Byte>^, Int32) | Converts the specified region of the input byte array from base 64 and copies the result to the specified region of the output byte array. |
![]() | TransformFinalBlock(array<Byte>^, Int32, Int32) | Converts the specified region of the specified byte array from base 64. |
Base 64 Content-Transfer-Encoding represents arbitrary bit sequences in a form that is not human readable.
The following example decodes a base 64-encoded file to an output text file.
using namespace System; using namespace System::IO; using namespace System::Security::Cryptography; class MyMainClass { public: static void DecodeFromFile( String^ inFileName, String^ outFileName ) { FromBase64Transform^ myTransform = gcnew FromBase64Transform( FromBase64TransformMode::IgnoreWhiteSpaces ); array<Byte>^myOutputBytes = gcnew array<Byte>(myTransform->OutputBlockSize); //Open the input and output files. FileStream^ myInputFile = gcnew FileStream( inFileName,FileMode::Open,FileAccess::Read ); FileStream^ myOutputFile = gcnew FileStream( outFileName,FileMode::Create,FileAccess::Write ); //Retrieve the file contents into a Byte array. array<Byte>^myInputBytes = gcnew array<Byte>(myInputFile->Length); myInputFile->Read( myInputBytes, 0, myInputBytes->Length ); //Transform the data in chunks the size of InputBlockSize. int i = 0; while ( myInputBytes->Length - i > 4 ) { myTransform->TransformBlock( myInputBytes, i, 4, myOutputBytes, 0 ); /*myTransform->InputBlockSize*/ i += 4; /*myTransform->InputBlockSize*/ myOutputFile->Write( myOutputBytes, 0, myTransform->OutputBlockSize ); } //Transform the final block of data. myOutputBytes = myTransform->TransformFinalBlock( myInputBytes, i, myInputBytes->Length - i ); myOutputFile->Write( myOutputBytes, 0, myOutputBytes->Length ); //Free up any used resources. myTransform->Clear(); myInputFile->Close(); myOutputFile->Close(); } }; int main() { MyMainClass * m = new MyMainClass; //Insert your file names into this method call. m->DecodeFromFile( "c:\\encoded.txt", "c:\\roundtrip.txt" ); }
Available since 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


