class array problem.

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I encoutered a problem and can't solve it:

in main()
hformation *fdatah;
fdatah=new hformation();

then sent it to a function:
formationinput(vformation *fdatav,hformation *fdatah,ptfilein);


in the function, I redefined this class pointer as an class array:
fdatah=new hformation[7];

passed compile and link, but each time debug to here got error:
Unhandled exception at 0x00433520 in forwardso.exe: 0xC0000005: Access violation reading location 0x00000000.

What's the cause of this problem?

By the looks of it, you have several problems. Post more code please, preferably something that we can compile and run as well.