截取字符串？

[quwei197874]

string sTest = "D:\Type\family.txt";

上面的字符串我想把family截取出来，应该怎么做？

[sutaizi]

什么语言

[quwei197874]

c++

[ryfdizuo]

strtok
或者string.find

[ryfdizuo]

// string::find_last_of
#include <iostream>
#include <string>
using namespace std;

void SplitFilename (const string& str)
{
  size_t found;
  cout << "Splitting: " << str << endl;
  found=str.find_last_of("/\\");
  cout << " folder: " << str.substr(0,found) << endl;
  cout << " file: " << str.substr(found+1) << endl;
}

int main ()
{
  string str1 ("/usr/bin/man");
  string str2 ("c:\\windows\\winhelp.exe");

  SplitFilename (str1);
  SplitFilename (str2);

  return 0;
}

Splitting: /usr/bin/man
folder: /usr/bin
file: man
Splitting: c:\windows\winhelp.exe
folder: c:\windows
file: winhelp.exe

[qq120848369]

size_t pos=find(0,".");

然后从pos往前找一个'\',就行了.

[bdmh]

string sTest = "D:\\Type\\family.txt";
int a = sTest.find_last_of(".");
int b = sTest.find_last_of("\\");
string s = sTest.substr(b+1,a);

[sutaizi]

用 find_last_of（x） 得到x的位置 也就是说 得到最后一个‘/’ 的位置p1和最后一个‘.’的位置p2 然后substr(p1,p2)就能得到文件名了。

[sutaizi]

p1+1

[就想叫yoko]

strtok
sscanf

string的一系列find

[c_losed]

[Quote=引用 6 楼 bdmh 的回复:]

C/C++ code

string sTest = "D:\\Type\\family.txt";
int a = sTest.find_last_of(".");
int b = sTest.find_last_of("\\");
string s = sTest.substr(b+1,a);
[/Quote]

string s = sTest.substr(b+1,a-b-1);//ms应该这样

[赵4老师]

#include <string>
#include <iostream>
using namespace std;
int main() {
    string sTest="D:\\Type\\family.txt";
    string fe=sTest.substr(sTest.rfind("\\")+1);
    cout << fe << endl; //family.txt
    string f=fe.substr(0,fe.rfind("."));
    cout << f << endl; //family
    return 0;
}

[ryfdizuo]

lz的字符串本身就有问题：string sTest="D:\Type\family.txt";
应该是两个\\

[赵4老师]

#include <string>
#include <iostream>
#include <stdlib.h>
using namespace std;
int main() {
    string sTest="D:\\Type\\family.txt";
    string fe=sTest.substr(sTest.rfind("\\")+1);
    cout << fe << endl; //family.txt
	string f=fe.substr(0,fe.rfind("."));
    cout << f << endl; //family

	char fname[_MAX_FNAME];
	_splitpath(sTest.c_str(),NULL,NULL,fname,NULL);
	printf("%s\n",fname); //family

    return 0;
}

_splitpath, _wsplitpath
Break a path name into components.

void _splitpath( const char *path, char *drive, char *dir, char *fname, char *ext );

void _wsplitpath( const wchar_t *path, wchar_t *drive, wchar_t *dir, wchar_t *fname, wchar_t *ext );

Routine Required Header Compatibility
_splitpath <stdlib.h> Win 95, Win NT
_wsplitpath <stdlib.h> or <wchar.h> Win 95, Win NT


For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version


Return Value

None

Parameters

path

Full path

drive

Optional drive letter, followed by a colon (:)

dir

Optional directory path, including trailing slash. Forward slashes ( / ), backslashes ( \ ), or both may be used.

fname

Base filename (no extension)

ext

Optional filename extension, including leading period (.)

Remarks

The _splitpath function breaks a path into its four components. _splitpath automatically handles multibyte-character string arguments as appropriate, recognizing multibyte-character sequences according to the multibyte code page currently in use. _wsplitpath is a wide-character version of _splitpath; the arguments to _wsplitpath are wide-character strings. These functions behave identically otherwise.

Generic-Text Routine Mappings

TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_tsplitpath _splitpath _splitpath _wsplitpath


Each argument is stored in a buffer; the manifest constants _MAX_DRIVE, _MAX_DIR, _MAX_FNAME, and _MAX_EXT (defined in STDLIB.H) specify the maximum size necessary for each buffer. The other arguments point to buffers used to store the path elements. After a call to _splitpath is executed, these arguments contain empty strings for components not found in path. You can pass a NULL pointer to _splitpath for any component you don’t need.

Example

/* MAKEPATH.C */

#include <stdlib.h>
#include <stdio.h>

void main( void )
{
char path_buffer[_MAX_PATH];
char drive[_MAX_DRIVE];
char dir[_MAX_DIR];
char fname[_MAX_FNAME];
char ext[_MAX_EXT];

_makepath( path_buffer, "c", "\\sample\\crt\\", "makepath", "c" );
printf( "Path created with _makepath: %s\n\n", path_buffer );
_splitpath( path_buffer, drive, dir, fname, ext );
printf( "Path extracted with _splitpath:\n" );
printf( " Drive: %s\n", drive );
printf( " Dir: %s\n", dir );
printf( " Filename: %s\n", fname );
printf( " Ext: %s\n", ext );
}


Output

Path created with _makepath: c:\sample\crt\makepath.c

Path extracted with _splitpath:
Drive: c:
Dir: \sample\crt\
Filename: makepath
Ext: .c


File Handling Routines

See Also _fullpath, _getmbcp, _makepath, _setmbcp