problem using NtQueryInformationProcess()

// A simple program that uses LoadLibrary and // GetProcAddress to access NtQueryInformationProcess from ntdll.dll.  #include <windows.h> #include <stdio.h>#include <winternl.h>#include <iostream>using std::cout;// Function pointer declaration. VERY IMPORTANT!typedef NTSTATUS (*MYPROC)(HANDLE, PROCESSINFOCLASS, PVOID, ULONG, PULONG);  int main(void) {     HINSTANCE hinstLib;     MYPROC ProcAdd;     BOOL fFreeResult, fRunTimeLinkSuccess = FALSE;      // Get a handle to the DLL module.    hinstLib = LoadLibrary(TEXT("ntdll.dll"));      // If the handle is valid, try to get the function address.    if (hinstLib != NULL)     {         ProcAdd = (MYPROC) GetProcAddress(hinstLib, "NtQueryInformationProcess");          // If the function address is valid, call the function.        if (NULL != ProcAdd)         {            fRunTimeLinkSuccess = TRUE;            HANDLE h = GetModuleHandle(0); // fill this in yourself            PROCESS_BASIC_INFORMATION pbi;            DWORD data_length = 0;            (ProcAdd)(h, ProcessBasicInformation, &pbi, sizeof(pbi), &data_length);            cout << data_length;        }        // Free the DLL module.        fFreeResult = FreeLibrary(hinstLib);     }    return 0;}

// Note the difference! ProcAdd is a function pointer, not an NTSTATUS. :)_NtQueryInformationProcess ProcAdd = (_NtQueryInformationProcess) GetProcAddress(jo, "NtQueryInformationProcess");