a pointer-to-memeber is not valid for a managed class - c++-cli

Question

I have a Windows Form in Visual Studio C++. (CLR)
In the header file, I declare void createThread()
private:
void createThread() {
char buffer[1024];
ZeroMemory(buffer, sizeof(buffer));
while (true) {
recv(connection, buffer, sizeof(buffer), 0);
main.displayMessage(gcnew System::String(buffer));
}
ExitThread(0);
}
Now, I want to call function createThread
CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)createThread, NULL, NULL, NULL)
After that I get this error:
a pointe-to-member is not valid for a managed class
I tried user thread library but not support. How can I fix??

Answer 1

It appears that this function is defined in a managed class. You need to use the managed thread object, not unmanaged CreateThread.
This error exists for two reasons: First, it's a instance method, not a static method, so it would need to be called with an instance of this type, which there's no way to pass to CreateThread. Second, it's a managed object, and its methods do not trivially convert to C-style raw function pointers.
Finally, a note about the language: C++/CLI is meant to act as a way to interface managed code (e.g., C#) with unmanaged C++. It's not intended as a primary development language. If you don't need to link managed and unmanaged code, you may want to consider switching to either C# or C++ for your application.