.net framwork 4.5 mix with C++. How to pass Bitmap from .net to C++?

Question

.NET

The code is a mix of c++ function and .net functions

Есть объект bmp0->Save(scanadr1, System::Drawing::Imaging::ImageFormat::Bmp);
//bmp0 это класс BitMap C#

How can I store this in base64 and not in a file.
all examples with Convert.ToBase64String. and Convert does not work. (Using the type name is not allowed)

Answer 1

decided. Syntax error.