pinvoke - DllImport and return parameters -


I'm working on hardware testing. Our test framework has been written in C # The country is using DLL.

We have a C ++ method: 

  unsigned characters some method (unsigned long * root status)   
 which executes an embedded command and returns the status when the order is completed.  
 We use the cover  
  [DllImport (@ "native.dll", Charset = Charset.exe, Calling Communication = Calling Communication. CDCL] Internal Static Extern Byte SomeMethod (Riff UInt32 Managed Stats)   
 This works fine but there is a scenario when  someMethod  is actually a call Does not execute the command, but it adds to a sequence, then execute a particular command, by pressing  ExecuteSequence  Could. As the sequence is being executed, C ++ code updates the  native status , simply copying the data to the memory referenced by the  native status  pointer. As the sequence completes the  ExecuteSequence  method returns, at the moment I believe all data (in this case, the  nativeStatus ) has been updated. Will my  managed status  be updated correctly? I have heard that in this case  managed status  and  original status  are not pointing to the same memory Marshaller just after the call is completed  nativeState  What if a solution does not give a copy? Do I need to use unsold keywords and need to create and execute my code in the  defined {}  block  block? [DllImport (@ "native.dll", Charset = CharSet.Ansi, Calling Communication = Calling Communication. CDEcl)] Internal Fixed Exception Extern Byte SomeMethod (UInt32 * Managed Status) )   
 
 
 So whatever you want is a variable location, Will not change  
 Yes, you set  for this {} . Alternatively, you can pin that variable:  
  private UIT g_Pinnable = 0; ... var gc = System.Runtime.InteropServices.GCHandle.Alloc (g_Pinnable, System.Runtime.InteropServices.GCHandleType.Pinned); Try {// Pass 'ref g_Pinnable' to reciprocate the API // again. } Finally {gc.Free (); // g_Pinable to reference can be invalid after this point}

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