求助：如何读入.dat文件中的数据

[todayq]

我在.dat文件中存入了一系列文件的路径
E:\pictures\1.jpg
E:\pictures\2.jpg
……
现在我希望打开此.dat文件，并取出每个路径。我该怎么做呢?
希望各位大侠指点一下
谢谢啦！

[冷月清晖]

把你的write函数改为read不就行了么，
我就不信你能写进去，然后就不会读了？

[Coding4Girls]

[Quote=引用 1 楼 bubu8633 的回复:]
把你的write函数改为read不就行了么，
我就不信你能写进去，然后就不会读了？
[/Quote]
估计他的图片是复制进去的

[todayq]

恩，其实我也不会写。
拜托大侠教教我怎么写入和读出吧。谢啦

[Coding4Girls]

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

//输出空行
void OutPutAnEmptyLine()
{
    cout<<"\n";
}

//读取方式: 逐词读取, 词之间用空格区分
//read data from the file, Word By Word
//when used in this manner, we'll get space-delimited bits of text from the file
//but all of the whitespace that separated words (including newlines) was lost. 
void ReadDataFromFileWBW()
{
    ifstream fin("data.txt");  
    string s;  
    while( fin >> s ) 
    {    
        cout << "Read from file: " << s << endl;  
    }
}

//读取方式: 逐行读取, 将行读入字符数组, 行之间用回车换行区分
//If we were interested in preserving whitespace, 
//we could read the file in Line-By-Line using the I/O getline() function.
void ReadDataFromFileLBLIntoCharArray()
{
    ifstream fin("data.txt"); 
    const int LINE_LENGTH = 100; 
    char str[LINE_LENGTH];  
    while( fin.getline(str,LINE_LENGTH) )
    {    
        cout << "Read from file: " << str << endl;
    }
}

//读取方式: 逐行读取, 将行读入字符串, 行之间用回车换行区分
//If you want to avoid reading into character arrays, 
//you can use the C++ string getline() function to read lines into strings
void ReadDataFromFileLBLIntoString()
{
    ifstream fin("data.txt");  
    string s;  
    while( getline(fin,s) )
    {    
        cout << "Read from file: " << s << endl; 
    }
}

//带错误检测的读取方式
//Simply evaluating an I/O object in a boolean context will return false 
//if any errors have occurred
void ReadDataWithErrChecking()
{
    string filename = "dataFUNNY.txt";  
    ifstream fin( filename.c_str());  
    if( !fin ) 
    {   
        cout << "Error opening " << filename << " for input" << endl;   
        exit(-1);  
    }
}

int main()
{
    ReadDataFromFileWBW(); //逐词读入字符串 
    OutPutAnEmptyLine(); //输出空行

    ReadDataFromFileLBLIntoCharArray(); //逐词读入字符数组
    OutPutAnEmptyLine(); //输出空行

    ReadDataFromFileLBLIntoString(); //逐词读入字符串
    OutPutAnEmptyLine(); //输出空行

    ReadDataWithErrChecking(); //带检测的读取
    return 0;
}

[todayq]

谢谢楼上的大侠们了。
如果我想打开一个文件夹，然后将该文件夹里的文件路径都写入一个.dat文件里，又该如何实现呢？

[wukong000]

open
read
write
close

[Coding4Girls]

       CFile file;    
     file.Open(_T("Test.dat"), CFile::modeCreate | CFile::modeWrite); 
    CFileFind finder;
    CString strFileName;
    bool bWorking = finder.FindFile(_T("你的路径"));
    while(bWorking)
    {
        bWorking = finder.FindNextFile( );
        strFileName = finder.GetFileName();

        file.Write(strFileName, 2*strFileName.GetLength());  



    }
 file.Close();

[herman~~]

mark...。

[ypb362148418]

用read()函数，只要是文件都是可以，不用管是什么格式的

[todayq]

void CMyView::OnRead() 
{
 CFile file;    
     file.Open(_T("Test.dat"), CFile::modeCreate | CFile::modeWrite); 
    CFileFind finder;
    CString strFileName;
    bool bWorking = finder.FindFile(_T("D:\\img"));
    while(bWorking)
    {
        bWorking = finder.FindNextFile( );
        strFileName = finder.GetFileName();

        file.Write(strFileName, 2*strFileName.GetLength());  



    }
 file.Close();
	
}

test文本中只有“img”，没有列出所有文件的路径呀。怎么回事呢？

[勇敢的搬砖人]

友情帮顶

[勇敢的搬砖人]

友情帮顶

[ForestDB]

帮顶。

[todayq]

#include<iostream> 
#include<io.h> 
#include <fstream>
#include <string>
using namespace std; 

void main() 
{ 
    _finddata_t file; 
	ofstream ofs("D:\\posdatatest.dat");
	string s;
    long lf; 
//修改这里选择路径和要查找的文件类型
    if((lf = _findfirst("D:\\face\\posdata\\*.bmp",&file))==-1l)//_findfirst返回的是long型;long __cdecl _findfirst(const char *, struct _finddata_t *) 
        cout<<"文件没有找到!\n"; 
    else 
    { 
        do{ 
            ofs.write(file.name,strlen(file.name)); 
			ofs.write("\n",strlen("\n"));
        } while( _findnext( lf, &file ) == 0 );//int __cdecl _findnext(long, struct _finddata_t *);如果找到下个文件的名字成功的话就返回0,否则返回-1 
   
    } 
    _findclose(lf); 
	ofs.close();
} 

终于搞定了。谢谢各位大侠啦！