warning C4244: '=': conversion from 'ULONGLONG' to 'unsigned long', possible loss of data

1>c:\demo_temp\stdiofiletest_demo_project\stdiofileex.cpp(464): warning C4244: '=': conversion from 'ULONGLONG' to 'unsigned long', possible loss of data

1. CStdioFile-derived class for multibyte and Unicode reading and writing

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2. How can avoid warning C4244: conversion from 'ULONGLONG' to 'double', possible loss of data

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3. warning C4244: 'return' : conversion from 'ULONGLONG' to 'DWORD', possible loss of data

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4. Error Message Warning C4244

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