C / C++ / MFC

String search in a file(very urgent)

2-Apr-07 2:21

Welcome.

Prasad
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Re: Remove Backslashes

Sachin R Sangoi2-Apr-07 1:49

Sachin R Sangoi

2-Apr-07 1:49

Before return LastPtr line add the line LastPtr++ and everything wil be fine.
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yaminisridaran1-Apr-07 23:23

1-Apr-07 23:23

I have to implement a string search in a file I have problem in using fgetc because i am alternative characters from the file.

S.Yamini

Rajesh R Subramanian1-Apr-07 23:42

Rajesh R Subramanian

1-Apr-07 23:42

Can you explain it better?

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yaminisridaran2-Apr-07 0:21

2-Apr-07 0:21

Thanks

S.Yamini

Parthi_Appu1-Apr-07 23:44

1-Apr-07 23:44

yaminisridaran wrote:
because i am alternative characters from the file

I think you missed some thing here...

Generally to find a string, use comparision APIs, say strcmp, CString::Compare and also APIs are available for case in sensitive comparing..

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yaminisridaran2-Apr-07 0:57

2-Apr-07 0:57

Actually I have a txt file and i want to fetch the last string of the file.Can u help in this

S.Yamini

Parthi_Appu2-Apr-07 1:25

2-Apr-07 1:25

yaminisridaran wrote:
I have a txt file and i want to fetch the last string of the file

Actually i donno any API for this, but i'll you an algo for this,
1) Open the File as Random file
2) Move the file pointer to end of file (using seek method)
--inside loop
3) Decrement the pointer and read a char (to read the char before, using seek method)
4) check for delimiting chars (say space, or some thing else)
5) if not a delimiting char then append the char to a string
6) decrement the file pointer (to set to previous position, using seek method)
7) goto step 3 (have to decrement again, to get previous char)
8) if its a delimiting char then break the loop.
--end of loop
Now you got the last word in the file, but it'll be in reverse. So apply strrev and get the original string..

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yaminisridaran2-Apr-07 1:57

2-Apr-07 1:57

I tried this procedure but the decrementing the pointer and reading the data gives me data as -1

S.Yamini

Parthi_Appu2-Apr-07 2:06

2-Apr-07 2:06

Can you show some code..which tells hw you implemented

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yaminisridaran2-Apr-07 2:14

2-Apr-07 2:14

FILE *fp;
int a;
CString m_buffer;
fp=fopen("yamini.txt","r+");
fseek (fp , 0 , SEEK_END);
fp--;
while(1)
{
a=fgetc(fp);
if(a==32)
break;
else
m_buffer+=(char)a;
fp--;
}

S.Yamini

Parthi_Appu2-Apr-07 2:22

2-Apr-07 2:22

see the comments and changes

FILE *fp;
int a;
CString m_buffer("");
fp=fopen("yamini.txt","r+");
fseek (fp , 0 , SEEK_END);
//fp--; /* not like this */
while(1)
{
fseek(fp, -1, SEEK_CUR); /* i mentioned to use seek method */
a=fgetc(fp);
if(a==32)
break;
else
m_buffer+=(char)a;
//fp--; /*not like this */
fseek(fp, -1, SEEK_CUR);
}

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intial folder with standard class CFileDialog

David Crow2-Apr-07 4:09

David Crow

2-Apr-07 4:09

What defines (i.e., delimits) the "last string?"

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Ing.Raiz821-Apr-07 22:58

1-Apr-07 22:58

Hi,

i want to see the folder that i want, when i call the:

CFileDialog dlg(TRUE, _T("dgl"), _T("Playlist"), OFN_FILEMUSTEXIST, szFilters, this);
dlg.doModal

have you got an idea...

thanks

Raiz Laugh | :laugh:

prasad_som1-Apr-07 23:18

1-Apr-07 23:18

Use CFileDialog::m_ofn-->lpstrInitialDir .Modify your code like this,

CFileDialog dlg(TRUE, _T("dgl"), _T("Playlist"), OFN_FILEMUSTEXIST, "*.*", this);
dlg.m_ofn.lpstrInitialDir = "c:\\";//mention folder you want to display initialy
dlg.DoModal();

Prasad
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Ing.Raiz821-Apr-07 23:38

1-Apr-07 23:38

CFileDialog dlg(TRUE, _T("dgl"), _T("Playlist"), OFN_FILEMUSTEXIST, "*.*", this);
dlg.m_ofn.lpstrInitialDir = "c:\\";//mention folder you want to display initialy
dlg.DoModal();

dlg don't see .m_ofn have you got an idea?

thanks

Giulio Big Grin | :-D

prasad_som1-Apr-07 23:47

1-Apr-07 23:47

Ing.Raiz82 wrote:
dlg don't see .m_ofn have you got an idea?

What ? its member of CFileDialog.

Prasad
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Ing.Raiz821-Apr-07 23:50

1-Apr-07 23:50

i use this...
dlg.m_pOFN->lpstrInitialDir = "c:\\";

because i don't find ....m_ofn

thanks...

prasad_som1-Apr-07 23:56

1-Apr-07 23:56

Ing.Raiz82 wrote:
because i don't find ....m_ofn

What ??

Are you sure ?

Prasad
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Ing.Raiz822-Apr-07 0:14