164 lines
3.3 KiB
C++
164 lines
3.3 KiB
C++
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#include "stdafx.h"
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#include "rwfile.h"
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CRWFile::CRWFile()
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{
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IRWFile::m_hFile = INVALID_HANDLE_VALUE;
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}
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CRWFile::~CRWFile()
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{
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if( IRWFile::m_hFile != INVALID_HANDLE_VALUE ) {
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CloseHandle( IRWFile::m_hFile );
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}
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}
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HRESULT CRWFile::InitFile
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(
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IN LPCTSTR lpFileName,
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IN DWORD dwDesiredAccess,
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IN DWORD dwShareMode,
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IN LPSECURITY_ATTRIBUTES lpSecurityAttributes,
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IN DWORD dwCreationDisposition,
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IN DWORD dwFlagsAndAttributes,
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IN HANDLE hTemplateFile
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)
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{
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_ASSERTE( lpFileName != NULL );
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HRESULT hr = E_FAIL;
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__try
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{
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if( !lpFileName ) { hr = E_INVALIDARG; goto qInitFile; }
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m_hFile = CreateFile(
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lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpSecurityAttributes,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTemplateFile
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);
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if( m_hFile == INVALID_HANDLE_VALUE ) {
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hr = HRESULT_FROM_WIN32(GetLastError());
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goto qInitFile;
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}
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hr = S_OK;
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qInitFile:
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if( FAILED(hr) ) {}
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}
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__except ( EXCEPTION_EXECUTE_HANDLER, 1 ) {
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hr = E_UNEXPECTED;
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_ASSERTE( false );
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}
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return hr;
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}
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HRESULT CRWFile::Read
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(
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OUT LPVOID lpBuffer,
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IN DWORD nNumberOfBytesToRead,
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OUT LPDWORD lpNumberOfBytesRead,
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OUT LPOVERLAPPED lpOverlapped
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)
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{
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_ASSERTE( lpBuffer != NULL );
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_ASSERTE( nNumberOfBytesToRead > 0 );
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HRESULT hr = E_FAIL;
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BOOL bRet = false;
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__try
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{
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if( !lpBuffer || nNumberOfBytesToRead <= 0 ){
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hr = E_INVALIDARG; goto qRead;
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}
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bRet = ReadFile(
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m_hFile,
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lpBuffer,
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nNumberOfBytesToRead,
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lpNumberOfBytesRead,
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lpOverlapped
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);
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if( bRet && *lpNumberOfBytesRead == 0 ) { // crossed beyond the end of the file.
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hr = S_FALSE; goto qRead;
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}
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if( !bRet ) {
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hr = HRESULT_FROM_WIN32(GetLastError()); goto qRead;
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}
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hr = S_OK;
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qRead:
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if( FAILED(hr) ){}
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}
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__except ( EXCEPTION_EXECUTE_HANDLER, 1 ) {
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hr = E_UNEXPECTED;
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_ASSERTE( false );
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}
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return hr;
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}
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HRESULT CRWFile::Write
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(
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OUT LPCVOID lpBuffer,
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IN DWORD nNumberOfBytesToWrite,
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OUT LPDWORD lpNumberOfBytesWritten,
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OUT LPOVERLAPPED lpOverLapped
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)
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{
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_ASSERTE( lpBuffer != NULL );
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HRESULT hr = E_FAIL;
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BOOL bRet = false;
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__try
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{
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if( !lpBuffer ) { hr = E_INVALIDARG; goto qWrite; }
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bRet = WriteFile(
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m_hFile,
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lpBuffer,
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nNumberOfBytesToWrite,
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lpNumberOfBytesWritten,
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lpOverLapped
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);
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if( !bRet ) {
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hr = HRESULT_FROM_WIN32(GetLastError()); goto qWrite;
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}
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hr = S_OK;
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qWrite:
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if( FAILED(hr) ){}
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}
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__except ( EXCEPTION_EXECUTE_HANDLER, 1 ) {
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hr = E_UNEXPECTED;
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_ASSERTE( false );
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}
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return hr;
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}
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