GetThreadContext在win7 x64上返回87

Question

我试图在函数中运行此代码，但GetThreadContext返回错误：87

CONTEXT cxt;
SuspendThread(hThread);

ZeroMemory(&cxt, sizeof(cxt));
cxt.ContextFlags = CONTEXT_FULL;
if (!GetThreadContext(hThread, &cxt)) {
    printf("GetThreadContext getlasterror: %d", GetLastError());
    goto finish;
}