如何将托管c ++中的字节数组封送到c＃

Question

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

如何使这段代码有效：

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

提前谢谢！

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);