pass several arguments to LPVOID param of CreateThread

What is the best way to pass more than one argument to the LPVOID parameter of CreateThread -- No MFC? (I am actually using _beginthreadex, which is virtually identical.) I, of course, am assuming it is possible.

I have tried everything but only get compiler errors.

If it isn't possible, how else can I pass arguments to a thread before it starts?

thanks

You have a few options....

Make all variables global - this is faster and less trouble, but should be discouraged as it can lead to problems and its best to have variables local where you can...

or

Define a struct or class with all the data you need as members.......you can then pass a pointer through the function and collect it at the other end.....

Thanks, I will try passing a structure.....great idea!

Oh....one thing.....be carefull when you are doing this with threads.....remember, 2 threads accessing/amending the same memory at the same time can cause diasters.........you might need some sort of thread sync....

Also, remember that passing a pointer to a tread from another thread is only viable if the data stays in scope.....if thread1 passes a pointer to local data to thread2, and then goes out of scope....you've had it!

You should create a global structure. Pass a reference or pointer of the structure to the worker thread.

For example:

-----
// this should be global

UINT YourWorkerThreadFunc(LPVOID pParam);

typedef struct tagYOURWORKERTHREAD
{
... // whatever you want to pass into the worker thread
...
...
} YOURWORKERTHREAD;
----

----
YOURWORKERTHREAD *ptp = new YOURWORKERTHREAD;

ptp->blah = whatever
...

CWinThread *m_pYourWorkerThread = AfxBeginThread(YourWorkerThreadFunc, ptp, THREAD_PRIORITY_NORMAL,
0, CREATE_SUSPENDED);

m_pYourWorkerThread ->m_bAutoDelete = FALSE;

// You need this to close the worker thread later

m_pYourWorkerThread = m_pYourWorkerThread ->m_hThread;
m_pYourWorkerThread ->ResumeThread();
-----


Kuphryn