QSharedMemory won't attach

[MattPhillips]

Hello,

This is happening both with qt examples and my own sample code. Specifically, when I execute this:

QSharedMemory* mem = new QSharedMemory("testkey");
    mem->create(sizeof(int));
    if (mem->attach())
	qDebug() << "Successful attach()";
    else
	qDebug() << "attach() failed, code " << mem->error() << ", " << mem->errorString();

QSharedMemory* mem = new QSharedMemory("testkey");
    mem->create(sizeof(int));
    if (mem->attach())
	qDebug() << "Successful attach()";
    else
	qDebug() << "attach() failed, code " << mem->error() << ", " << mem->errorString();

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I get this:

attach() failed, code 0 , ""

The same thing happens with the examples (examples/ipc/sharedmemory and another one from Nokia that displays images). The attach fails yet no error flag is thrown. Moreover this happens on Max 10.5, Windows XP, and Ubuntu 9.10; I'm using Qt 4.5.3. Does anybody know what's going on? Thank you--

Matt