1.new给指针分配内存。 这样才能对指针操作 2.a_SendMsg^指针中存放的地址是Read_SendMsg(stream) 读入流的首地址. 3.指针的赋值 procedure New(var P: Pointer);DescriptionThe New procedure creates a new dynamic variable and sets a pointer variable to point to it. P is a variable of any pointer type. The size of the allocated memory block corresponds to the size of the type that P points to. The newly created variable can be referenced as P^. If there isn't enough memory available to allocate the dynamic variable, an EOutOfMemory exception is raised.When an application is finished using a dynamic variable created with New, it should dispose of the memory allocated for the variable using the Dispose standard procedure.
中的
a_SendMsg^
是不是代表指针所指地址的值，还是内存中的数据值？？
2.a_SendMsg^指针中存放的地址是Read_SendMsg(stream)
读入流的首地址.
3.指针的赋值
procedure New(var P: Pointer);DescriptionThe New procedure creates a new dynamic variable and sets a pointer variable to point to it. P is a variable of any pointer type. The size of the allocated memory block corresponds to the size of the type that P points to. The newly created variable can be referenced as P^. If there isn't enough memory available to allocate the dynamic variable, an EOutOfMemory exception is raised.When an application is finished using a dynamic variable created with New, it should dispose of the memory allocated for the variable using the Dispose standard procedure.