Reputation: 3720
I have 2 C++ DLLs. One of them contains the following function:
void init(const unsigned char* initData, const unsigned char* key)
The other one contains this function:
BYTE* encrypt(BYTE *inOut, UINT inputSize, BYTE *secretKey, UINT secretKeySize).
Is there a way to call these 2 functions from C#? I know you can use [DllImport] in C# to call C++ functions, but the pointers are giving me a hard time.
Any help would be appreciated!
Upvotes: 3
Views: 3249
Reputation: 23499
[DllImport("yourdll.dll")]
static extern void init([MarshalAs(UnmanagedType.LPArray)] byte[] initData, [MarshalAs(UnmanagedType.LPArray)] byte[] key);
[DllImport("yourdll.dll")]
static extern IntPtr encrypt([MarshalAs(UnmanagedType.LPArray)] byte[] inOut, int inputSize, [MarshalAs(UnmanagedType.LPArray)] byte[] key, int secretKeySize);
Upvotes: 2
Reputation: 3384
For pointers, what you want to use is IntPtr.
[DllImport("whatever.dll")]
static extern void init(IntPtr initData, IntPtr key);
Upvotes: 0
Reputation: 755397
Yes, you can call both of these from C# assuming that they are wrapped in extern "C" sections. I can't give you a detailed PInvoke signature because I don't have enough information on how the various parameters are related but the following will work.
[DllImport("yourdllName.dll")]
public static extern void init(IntPtr initData, IntPtr key);
[DllImport("yourdllName.dll")]
public static extern IntPtr encrpyt(IntPtr inout, unsigned inuputSize, IntPtr key, unsigned secretKeySize);
Pieces of information that would allow us to create a better signature
Upvotes: 6
Reputation: 186
For classes, you don't need to do anything special. For value types, you need to use the ref keyword.
MSDN has an article that summarizes this: http://msdn.microsoft.com/en-us/library/awbckfbz.aspx
Upvotes: 0