c++ - 如何将字节数组从托管 C++ 编码到 C#

Question

我想使用 C++ 托管项目中的 .Net Graphic 功能。我想从内存中的 C++ 字节数组创建 Windows.Drawing.Image(基于 MemoryStream)。

我怎样才能使这段代码工作:

System::IO::Stream^ ms = gcnew System::IO::MemoryStream();
BYTE buf[1024 * 8];  // C++
int size;  // C++
...
ms->Write(&buf, 0, size) 

提前致谢!

Answer 1

你可以这样做:

int size = 1024;

BYTE buf[1024];

// unmanaged buffer
System::IntPtr intPtr = System::IntPtr( buf );

// managed buffer 
array<unsigned char>^ managedBuf = gcnew array<unsigned char>(size);

{
    // write things to buf[]
}

// copy unmanaged buffer to managed buffer
Marshal::Copy( intPtr, managedBuf, 0, size );

System::IO::Stream^ ms = gcnew System::IO::MemoryStream();

ms->Write( managedBuf, 0, size);