VC讀取文本文件

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VC中怎么讀取.txt文件

一、

CStdioFile

二、

FILE*f=fopen(filename,mode);

charbuff[size];

fread(buff,size,1,f);

fclose(f);

三、

//用MFC讀文件

CFilefile(yourfile.txt,CFile::modeRead);

char*pBuf;

intiLen=file.GetLength();

pBuf=newchar[iLen1];

file.Read(pBuf,iLen);

pBuf[iLen]=0;

file.Close();

MessageBox(pBuf);

四、

//用CSDK讀文件

HANDLEhFile;

hFile=CreateFile(2.txt,GENERIC_READ,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);

charch[100];

DWORDdwReads;

ReadFile(hFile,ch,100,dwReads,NULL);

CloseHandle(hFile);

ch[dwReads]=0;

MessageBox(ch);*

五、

用C讀文件

FILE*pFile=fopen(1.txt,rb);

char*pBuf;

fseek(pFile,0,SEEK_END);//移動(dòng)文件指針到文件末尾

intlen=ftell(pFile);//獲取當(dāng)前文件指針在文件中的偏移量，Getsthecurrentpositionofafilepointer.offset

pBuf=newchar[len];

rewind(pFile);//將指針移動(dòng)到文件頭，Repositionsthefilepointertothebeginningofafile

//也可以用fseek(pFile,0,SEEK_SET);

fread(pBuf,1,len,pFile);

pBuf[len]=0;

fclose(pFile);

MessageBox(pBuf);

voidCOrderReadFileDlg::OnRead()

{

CStringstrserver,strdatabase,strusr,strpwd,readstring;

if(file)

{

readlen=file.ReadString(readstring);

if(!readlen)

{

GetDlgItem(IDC_BTREAD)-EnableWindow(FALSE);

return;

}

intpos=readstring.Find();

strserver=readstring.Left(pos);

readstring=readstring.Right(readstring.GetLength()-pos-1);

pos=readstring.Find();

strdatabase=readstring.Left(pos);

readstring=readstring.Right(readstring.GetLength()-pos-1);

pos=readstring.Find();

strusr=readstring.Left(pos);

readstring=readstring.Right(readstring.GetLength()-pos-1);

pos=readstring.Find();

strpwd=readstring.Left(pos);

readstring=readstring.Right(readstring.GetLength()-pos-1);

GetDlgItem(IDC_EDSERVER)-SetWindowText(strserver);

GetDlgItem(IDC_EDDATABASE)-SetWindowText(strdatabase);

GetDlgItem(IDC_EDUSR)-SetWindowText(strusr);

GetDlgItem(IDC_EDPWD)-SetWindowText(strpwd);

}

}

voidCOrderReadFileDlg::OnOpen()

{

try{

file.Open(test1.txt,CFile::modeRead);

GetDlgItem(IDC_BTOPEN)-EnableWindow(FALSE);

GetDlgItem(IDC_BTREAD)-EnableWindow(TRUE);

AfxMessageBox(文件已開啟);

}catch(CFileException*e)

{

TCHARszBuf[256];

e-GetErrorMessage(szBuf,256,NULL);

Messa

geBox(szBuf,_T(Warning));

e-Delete();

}

}

voidCOrderReadFileDlg::OnExit()

{

file.Close();

this-On

Cancel();

}

boolCConLog::WriteLogTxt(CStringtime,CStringvalue){

//定義寫入字符數(shù)組

CStringtmp=time+value;

//定義輸出流

ofstreamoFile;

oFile.open(m_sFullName.GetBufferMAX_PATH),ios::app|ios::binary);

oFile.seekp(0,ios::end);//回到文件末尾

//寫入文件流

if?(oFile.is_open())

{

//下面藍(lán)色部分解決了CHAR[]寫入的問題，不用再做拷貝了，增加了安全

oFile.write(tmp.GetBuffer(tmp.GetLength()),tmp.GetLength));

oFile.write(_T(\r\n),2);//寫在一起會(huì)產(chǎn)生亂碼?

}

else?{

oFile.close();

return?false;

}

oFile.close();

return?true;

}

bool?CConLog::WriteLogTxt(CStringkey,CStringtime,CStringvalue)

{

//讀寫文件全名

if(m_sFullName==_T())

{

AfxMessageBox(請(qǐng)?jiān)O(shè)置日志保存路徑！);returnFALSE;}

//操作文件

try{

this-m_sfFile.Open(m_sFullName,CFile::modeCreate|CFile::modeNoTruncate|CFile::modeWrite);

m_sfFile.SeekToEnd();

this-m_sfFile.WriteString(time+_T(\r\n));

this-m_sfFile.WriteString(value+_T(\r\n));

this-m_sfFile