Junk binary date?

I call PQexecParams with the last parameter as 1 to return binary
data.  I then get this data with:

fileLengthPtr = PQgetvalue(result, rowIndex, fileLengthColumnIndex);
memcpy(&fileLength, fileLengthPtr, sizeof(fileLength));

The value being returned is of type integer.

It should have the value 7237 in binary.
It actually has the value:
fileLengthPtr[0]    0    char
fileLengthPtr[1]    0    char
fileLengthPtr[2]    28 '?'    char
fileLengthPtr[3]    69 'E'    char

Which is not 7237, it's:
fileLength    1159462912    int

Why?