如何將字節數組從托管 c++ 編組到 c#

Question

我想使用 C++ 托管項目中的 .Net 圖形功能。 我想從內存 c++ 字節數組創建 Windows.Drawing.Image （基於 MemoryStream）。

我怎樣才能使這段代碼工作：

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

先感謝您！

Answer 1

你可以這樣做：

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);