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#include <windows.h>
#include <tchar.h>
#include <cassert>//
// 读写文件的简单API函数封装
// CFileBaseHelper
// |
// -----------------
// | |
// CFileReadHelper CFileWriteHelper
//
///基类
enum FileTextType
{enANSI, //enUTF8, //EF BB BFenUnicode, //FF FEenUnicodeBigEndian, //FE FFenUnknown
};class CFileBaseHelper
{
public:CFileBaseHelper( LPCTSTR lpFileName);~CFileBaseHelper();void CloseFile();protected:FileTextType GetFileTextType(LPCTSTR lpFileName );FileTextType m_fttTextType;HANDLE m_hFile;
};CFileBaseHelper::CFileBaseHelper( LPCTSTR lpFileName ):m_fttTextType( enUnknown ), m_hFile( INVALID_HANDLE_VALUE )
{assert( lpFileName != NULL );if( lpFileName == NULL ){return;}m_fttTextType = GetFileTextType(lpFileName);//打开文件m_hFile = CreateFile( lpFileName, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ,NULL,OPEN_EXISTING, 0, NULL );}CFileBaseHelper::~CFileBaseHelper()
{CloseFile();
}void CFileBaseHelper::CloseFile()
{if( m_hFile != INVALID_HANDLE_VALUE ){CloseHandle( m_hFile );m_hFile = INVALID_HANDLE_VALUE;}
}/*****************************************************************
* 时 间: [2015年11月1日]
* 作 者：shanql
* 函数描述：获取文本类型
* 函数参数：
* 函数返回：
*****************************************************************/
FileTextType CFileBaseHelper::GetFileTextType( LPCTSTR lpFileName )
{if( !lpFileName ){return enUnknown;}FileTextType fttTextType = enUnknown;//open file to read three byte HANDLE hFile = CreateFile( lpFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,NULL, OPEN_EXISTING, NULL, NULL );BYTE cbFlag[3] = { 0 };DWORD dwByteRead = 0;if( INVALID_HANDLE_VALUE != hFile &&ReadFile( hFile, cbFlag, 3, &dwByteRead, NULL )){if( cbFlag[0] == 0xFF &&cbFlag[1] == 0xFE ){fttTextType = enUnicode;}else if ( cbFlag[0] == 0xFE &&cbFlag[1] == 0xFF ){fttTextType = enUnicodeBigEndian;}else if ( cbFlag[0] == 0xEF &&cbFlag[1] == 0xBB &&cbFlag[2] == 0xBF ){fttTextType = enUTF8;}else {fttTextType = enANSI;}}CloseHandle( hFile );return fttTextType;
}///
//读文件类
class CFileReadHelper:public CFileBaseHelper
{
public:CFileReadHelper( LPCTSTR lpFileName);BOOL ReadFile( LPVOID lpBuffer, DWORD dwByteToRead, LPDWORD lpByteRead );
};CFileReadHelper::CFileReadHelper( LPCTSTR lpFileName ):CFileBaseHelper( lpFileName )
{}BOOL CFileReadHelper::ReadFile( LPVOID lpBuffer, DWORD dwByteToRead, LPDWORD lpByteRead )
{assert( m_hFile != INVALID_HANDLE_VALUE );if( m_hFile == INVALID_HANDLE_VALUE ){return FALSE;}assert( lpBuffer != NULL );if( lpBuffer == NULL ){return FALSE;}BOOL bReadResult = FALSE;switch( m_fttTextType ){case enANSI:{bReadResult = ::ReadFile( m_hFile, lpBuffer, dwByteToRead, lpByteRead, NULL );break;}case enUnicode:case enUnicodeBigEndian:{//跳过前2个标记字节if( INVALID_SET_FILE_POINTER == SetFilePointer( m_hFile, 2, 0, FILE_BEGIN) ){if( GetLastError() != NOERROR ){return FALSE;}}bReadResult = ::ReadFile( m_hFile, lpBuffer, dwByteToRead, lpByteRead, NULL );break;}case enUTF8:{//跳过前3个标记字节if( INVALID_SET_FILE_POINTER == SetFilePointer( m_hFile, 3, 0, FILE_BEGIN) ){if( GetLastError() != NOERROR ){return FALSE;}}bReadResult = ::ReadFile( m_hFile, lpBuffer, dwByteToRead, lpByteRead, NULL );break;}default:{assert( false );return FALSE;}}return bReadResult;
}//
//写文件类
class CFileWriteHelper : public CFileBaseHelper
{
public:CFileWriteHelper( LPCTSTR lpFileName);BOOL WriteFile( LPVOID lpBuffer, DWORD dwByteToWrite, LPDWORD lpByteWrite );
};CFileWriteHelper::CFileWriteHelper( LPCTSTR lpFileName ):CFileBaseHelper( lpFileName )
{}BOOL CFileWriteHelper::WriteFile( LPVOID lpBuffer, DWORD dwByteToWrite, LPDWORD lpByteWrite )
{assert( m_hFile != INVALID_HANDLE_VALUE );if( m_hFile == INVALID_HANDLE_VALUE ){return FALSE;}assert( lpBuffer != NULL );if( lpBuffer == NULL ){return FALSE;}BOOL bWriteResult = FALSE;switch( m_fttTextType ){case enANSI:{bWriteResult = ::WriteFile( m_hFile, lpBuffer, dwByteToWrite, lpByteWrite, NULL );break;}case enUnicode:{ if( INVALID_SET_FILE_POINTER == SetFilePointer( m_hFile, 0, 0, FILE_BEGIN) ){if( GetLastError() != NOERROR ){return FALSE;}}//在文件头先写入两个字节的标记 FF FEDWORD dwWriteHead = 0;BYTE cbHeadFlag[] = { 0xFF, 0xFE };if( !::WriteFile( m_hFile, cbHeadFlag, 2, &dwWriteHead, NULL )){return FALSE;}bWriteResult = ::WriteFile( m_hFile, lpBuffer, dwByteToWrite, lpByteWrite, NULL );break;}case enUnicodeBigEndian:{if( INVALID_SET_FILE_POINTER == SetFilePointer( m_hFile, 0, 0, FILE_BEGIN) ){if( GetLastError() != NOERROR ){return FALSE;}}//在文件头先写入两个字节的标记 FE FFDWORD dwWriteHead = 0;BYTE cbHeadFlag[] = { 0xFE, 0xFF };if( !::WriteFile( m_hFile, cbHeadFlag, 2, &dwWriteHead, NULL )){return FALSE;}bWriteResult = ::WriteFile( m_hFile, lpBuffer, dwByteToWrite, lpByteWrite, NULL );break;}case enUTF8:{if( INVALID_SET_FILE_POINTER == SetFilePointer( m_hFile, 0, 0, FILE_BEGIN) ){if( GetLastError() != NOERROR ){return FALSE;}}//在文件头先写入3个字节的标记 EF BB BFDWORD dwWriteHead = 0;BYTE cbHeadFlag[] = { 0xEF, 0xBB, 0xBF };if( !::WriteFile( m_hFile, cbHeadFlag, 3, &dwWriteHead, NULL )){return FALSE;}bWriteResult = ::WriteFile( m_hFile, lpBuffer, dwByteToWrite, lpByteWrite, NULL );break;}default:{assert( false );return FALSE;}}return bWriteResult;
}//测试函数
void ReverseFileTest( LPCTSTR lpFileName )
{assert( lpFileName != NULL );if( lpFileName == NULL ){return;}CFileReadHelper tmpFileRead( lpFileName );BYTE szReadBuffer[1024] = { 0 };DWORD dwByteRead = 0;if( !tmpFileRead.ReadFile( szReadBuffer, sizeof(szReadBuffer), &dwByteRead ) ){_tprintf( TEXT("read file failed.\r\n"));return;}tmpFileRead.CloseFile();//可以不调用，析构时会自动调用//反转文件内容INT nStart = 0;INT nEnd = dwByteRead-1;BYTE cbTemp;while( nStart < nEnd ){cbTemp = szReadBuffer[nStart];szReadBuffer[nStart] = szReadBuffer[nEnd];szReadBuffer[nEnd] = cbTemp;++nStart;--nEnd;}//写入文件CFileWriteHelper tmpFileWrite( lpFileName );DWORD dwByteWrite = 0;if( !tmpFileWrite.WriteFile( szReadBuffer, dwByteRead, &dwByteWrite ) ){_tprintf( TEXT("write file failed.\r\n") );return;}tmpFileWrite.CloseFile();//可以不调用，析构时会自动调用
}int main()
{ReverseFileTest(TEXT("test_ansi.txt"));ReverseFileTest(TEXT("test_unicode.txt"));ReverseFileTest(TEXT("test_unicode_big_endian.txt"));ReverseFileTest(TEXT("test_utf8.txt"));return 0;
}
作者：山丘儿
转载请标明出处，谢谢。原文地址：http://blog.csdn.net/s634772208/article/details/49563341
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