ReadProcessMemory()

Is there something else like ReadProcessMemory() because ReadProcessMemory() can't access all of the process memory?

Which process? Your process? Some other process? Keep in mind that it is extremely unlikely for an application to use up all of its 2GB memory space (which I assume you mean by "all of the process memory"). Memory is not readable or writeable unless it's allocated. Sometimes you can use ReadProcessMemory to check the readability of a section of another process's memory.

Thanks got it now