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.NET Forum / Languages / Managed C++ / May 2005How to transfer a memory block(not pointer) between two threads
Now I am try to transfer a memory pointer between two threads. but there has a error mesage. _CrtIsValidHeapPointer(pUserData) in dbgheap.c I lookup google and find it's seems to be the local heap in the two threads are different. so their memory that pointer point to are different. I want to ask how to pass a complete memory block between two threads enclosed in a COM thanks in advance. -jiing- I use vector can transfer memory block between threads. Thanks > I use vector can transfer memory block between threads. There's little about std::vector that makes it more or less appropriate for passing between threads than any other method. The one thing that it will get you is matched allocation and deallocation (which is no doubt what your problem was in the first place). -cd > Now I am try to transfer a memory pointer between two threads. > but there has a error mesage. [quoted text clipped - 9 lines] > how to pass a complete memory block between two threads enclosed in a > COM Memory is not owned by threads, but by processes. All threads of a process have equal access to any block of memory allocated by that process. Most likely you're running into a problem where you're allocating memory by one method (e.g. malloc) and deleting it by another (e.g. delete). The COM solution to passing memory ownership between threads is to alloc memory using CoTaskMemAlloc and free it using CoTaskMemFree. Depending on the signatures of the COM function you're calling, there are circumstances when the COM runtime will _require_ that a block of memory was allocated this way, because the runtime will de-allocate it for you (for example, an [in,out] parameter). -cd Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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