请教：如何判断.txt文件中一行有几个数字（数字之间用空格分开）以及总共有几行？？

[bladezh]

如题，另外如何将每行的数字存入一个数组中？由于在编写代码时并不知道一行有几个数字，所以好像不能用sscanf(str,"%f %f",&m_a,&m_b)这样的方式实现吧，小弟被此问题困扰4天有余，还请前辈高人们不吝赐教。

[legend-never-die]

首先，用getline一行一行读
其次，每行读的时候用getline，隔开符选择' '，就可以得到有几个数字，也可以得到有几行了

将每行数字读入数组更简单了，把每个读到的数字用atoi或atof转化成int存入一个vector即可

[grasshopperliu]

首先，你要读取你的所有行，
CFile thisfile;

//打开文件
thisfile.Open("yourfilename",CFile::modeRead);
DWORD fileLength=thisfile.GetLength();
char* TheFile = new char[fileLength]; //动态分配数组
//按字符方式读入文件
thisfile.Read(TheFile,fileLength);
thisfile.Close();
然后
char blank=' ';
CString mystr[10000]; //假设的最大读入字符串个数10000
long int number=0; //真实的字符串个数
//读入字符串过程
for(long int i=0;i<(long)fileLength;i++)

{

if(TheFile[i]!=blank)
mystr[number]=mystr[number]+TheFile[i];

else {

if((heFile[i+1]!=blank)
number++;}

}
这样你的数据就都保存在字符串里了，一个字符串一个，VC中有一个函数，
不好意思我忘了它的名字，就是将字符串中的数字给变回到数字类型，你可以再找知道的问一下。

[bladezh]

joise兄，我对vc不是很熟，你可否讲的详细一点？能给出代码最好了，谢谢！

[rabo]

我来说个土办法
CString str;
str.Mid(1,str.Find(" ",0));
循环计数就行了。

[wenxi2004]

mark

[jinxuliang]

不用那么麻烦的用这个函数，可以解决了
CString::SpanExcluding
CString SpanExcluding( LPCTSTR lpszCharSet ) const;
throw( CMemoryException );

Return Value

A substring that contains characters in the string that are not in lpszCharSet, beginning with the first character in the string and ending with the first character found in the string that is also in lpszCharSet (that is, starting with the first character in the string and up to but excluding the first character in the string that is found lpszCharSet). It returns the entire string if no character in lpszCharSet is found in the string.

Parameters

lpszCharSet

A string interpreted as a set of characters.

Remarks

Use this function to search the string for the first occurrence of any character in the specified set lpszCharSet. SpanExcluding extracts and returns all characters preceding the first occurrence of a character from lpszCharSet (in other words, the character from lpszCharSet and all characters following it in the string, are not returned). If no character from lpszCharSet is found in the string, then SpanExcluding returns the entire string.

Example

The following function returns the first portion of the src param.

// Portions are delimited by a semi-colon( ; ),
// a comma( , ), a period( . ), a dash( - ),
// or a colon( : ).

CString GetFirstPart( CString src)
{
return src.SpanExcluding( ";,.- :");
}