When you open a .txt file with fopen
Is there any way to delete some strings in a file without rewriting.
For example this is the txt file that i will open ... |
I have written a program that manipulates files and I sometimes to delete a file. So I searched and found the remove() function in the stdio header file in C.
The ... |
#include<stdio.h>
int main() {
FILE* fp;
fp = fopen("temp.txt", "w");
fprintf(fp, "Hello, World!\n");
// remove("temp.txt"); this requires the filename ...
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im working in a code that detects changes in a file (a log file) then its process the changes with the help of fseek and ftell. but if the file get ... |
For instance if I called WriteFile to the end of a file, and later I wanted to delete the written bytes, how could I do this? Do I have to read ... |
Is there a function in C that lets you search for a particular string and delete/replace it? If not, how do I do it myself?
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I am trying to execute LP to print a PDF document and wait for it to exit. After
it exists i am trying to delete the file with unlink();
However the wait finishes ... |
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I'm just trying to recover a file in C on an HFS+ formatted Volumn. According to
man undelete
NAME
undelete -- attempt to recover a ... |
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On Jun 13, 10:40 am, "Bernie" |
Hello, I was looking for a solution on http://www.cplusplus.com/ and serched groups, but cannot find anything interesting. My program opens an input file stream: ifstream f( "in.txt" ); then goes to its end: f.seekg( 0, ios_base::end ); and then, in a loop, waits for a new line to be put into this file, and reads it: string line; while( true ) ... |
Hello, I am pretty new to C++, and I have a question: I am, and have been using Dev-C++ I used this code, to delete a text file on my desktop. The first time around, it worked perfectly. Given the file example name of "dafile". #include // needed to use system() function int main() { system("del dafile.txt"); return 0; } ... |
I didn't go throught your code in detail, but roughly know what you want to do. First of all, for efficiency wise, i want to advice you to pass in the pointer of the structure to the function instead of passing the whole structure one at a time. check this out. Do you mean that you want to update the value ... |
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Hi, I hope someone can help me out here. I have this project where i'm supposed to write a program that takes in a user's id which (s)he enters on a web page, through CGI the page is linked to a C program that does a few calculations and according to that displays back on screen a certain amount of files ... |
Hi every body. i'd write a program to copy the content of one file to another file and to delete the content of the first file. But after deleting the first file remains the harddisk(even though it has no data in it). i want to remove the file totally from the harddisk. How to implement this. I'd written the program in ... |
Code: #include #include void write(); void del(req_year); void read(); struct product { char code[5]; int year; char country[25]; } ; struct product p; int main(void) { //write(); read(); del(); } void write() { FILE *file1; char choice; file1 = fopen("product.dat", "rb"); do { fflush(stdin); printf("Input product code: "); scanf("%s", &p.code); fflush(stdin); printf("\nInput product expired year: "); scanf("%d", &p.year); fflush(stdin); ... |
The "best" way would be to use a tool other than C, such as Perl, or Sed or Awk. You could do this in a single line. However, if you are bent on using C then you will need to hack it a bit and get what you want. This usually means reading the whole file in, finding what you don't ... |
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#include #include #include void changer(char *first,char *exchanger) { int i,x; for(i=0,x=0;first[i]=exchanger[x];i++,x++); } int main(void) { char buffer[100]; char exchanger[]="http://www.onemanga.com"; FILE *fp; int i=0; fp=fopen("D:\\test\\lol.txt","r+w"); fp2=fopen("D:\\test\\lchanged.txt","w"); while(fgets(buffer,sizeof buffer,fp)!=NULL) { puts(buffer);//for test to see if it changed it or not if(strstr(buffer,"http://www.narutocentral.com")) { changer(buffer,exchanger); puts(buffer);//so here it got changed but in txt it didnt !!! so WTF ??? } } return ... |
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I think you managed to misunderstand EVERY SINGLE reply. In summary: 1. You should not use feof() to control the loop - you will most likely run one more loop than you actually want - so you will try to delete the last file twice. Not quite as bad as adding an extra record to a database, but still absolutely not ... |
Hi, I am in the early stages of learning C (previously coded in java, PHP etc.). The code below is a simple menu which enables you to: create, delete, open and close a file. The problem i have is if you choose to create the file, then open it, it is then not possible to delete it (gives error 32). If ... |
#pragma comment( lib, "shell32.lib" ) #include #include #include BOOL DeleteDirectory(char *pSource) { SHFILEOPSTRUCT sh; ZeroMemory(&sh, sizeof(SHFILEOPSTRUCT)); sh.hwnd = NULL; sh.wFunc = FO_DELETE; sh.pFrom = pSource; sh.fFlags = FOF_NOCONFIRMATION | FOF_SILENT; return !SHFileOperation( &sh ); } int main(void) { if(DeleteDirectory("C:\\TEMP") == FALSE) printf("Temp folderNOT deleted\n"); else printf("Temp folder deleted Successfully\n"); return 0; } |
remove_non_empty_directory ("c:\\temp\\non_empty_dir\\*"); // ErrorExit implementation from MSDN // http://msdn2.microsoft.com/en-us/library/ms680582.aspx int remove_non_empty_directory (const char* path) { WIN32_FIND_DATA FindFileData; HANDLE hFind; int rtn; hFind = FindFirstFile(path, &FindFileData); if (hFind == INVALID_HANDLE_VALUE) { FindClose(hFind); return -1; } else { // delete 1st file rtn = DeleteFile(&(FindFileData.cFileName)); if (0 == rtn) { ErrorExit (NULL); } // List all the other files in the directory and ... |
Hi All, I would like to delete the specific lines in a file programmatically, is there any way I can do that? Similar to the one we do it in notepad i.e. as soon as we delete a line the line below the deleted line would occupy the current position. Thanks in advance |
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I just tried it again, and it compiles without problem.. as a commandline .exe, But does not give the same error..... Yet the test object is still not deleted.... So it just ignores it. If i add the almost identical code, to my plugin (a .dll) It instantly crashed, my plugin and it's host..... It gave me a warning not an ... |
<#include > <#include > <#include > <{> <{> <} > |
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In my delete func() I have noted where I need a func() to delete a selected structure. I have looked in every book I have and can't find an example to go by anywhere. Also, in my add_record func(), I need to be able to verify that the client_code has not already been used. Again, couldn't find any examples to help. ... |
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46. Delete file forums.devshed.com |
47. Delete file forums.devshed.comThe Win32 API does have a DeleteFile() as well as a CopyFile, a MoveFile, a CreateDirectory, and a RemoveDirectory. The more traditional functions are more OS-dependent. Traditionally, the command to delete a file was unlink(). The reason for the name is because it comes from UNIX where you can create any number of symbolic links to the same file or directory, ... |
General procedure: Open original file for reading. Open a temporary file for writing. Going one line at a time, read a line from the input file and, if it is not one of the ones you want to delete, write it to the output file. After you've read and possibly written the last line, close both files. Delete the original file. ... |
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path deleted file dear forum i have a project to make NTFS file recovery in my university. i have found deleted file in MFT but i can't find the path. any one can help me to find the path, example the deleted file in c:\folder\ here my source code Code: //in ntfs.h typedef struct { ULONG Type; USHORT UsaOffset; USHORT UsaCount; ... |
It doesn't need to... Consider the following: A file handle is valid only if the OS could give you access to a file(read/write)... and the OS mantains a list of currently opened file handles so if you try to delete any file referenced by a handle the OS will complain. The DeleteFile function is probably assuming that there is no handle ... |
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Hi all, I want to know: can we delete a file after I know that remove function has failed (that is sort of force delete). When I try to do a force delete from DOS prompt it gives me the error that its in use by another process (del /F filename.ext). Alternatively, even if I get to know as to how ... |
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Well, in C or C++ doesn't matter, but I need a script to delete files & directories, I'm sitting in the school and it is illegall to have some programs, files. So it will be good to have a program to delete some files. The program shall also be able so you can write which file, firectory that shall be deltet, ... |
i have this awesome freeware program called Restoration (version 2.5.14). it has a very unique function that allows you to delete the list of previously deleted files... for example.. you can search for deleted files to recover them.. but you can also somehow that i have no idea how the program does it, obliterate these file names and other data about ... |
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Read the file starting at the begining writing the characters you want to keep to a new file, skipping the ones you don't want to keep, deleting the old file and renaming the new one. There are more efficient ways to accomplish this, but they are all basically the same. You can change the contents of a file, you can even ... |
... WCHAR ucStrBuffer[MAXPATHSIZE]; if( ! MultiByteToWideChar(CP_ACP,0,dFileName,sizeof(dFileName),ucStrBuffer,sizeof(WCHAR) * MAXPATHSIZE) ) MessageBox("MultiByteToWideChar returned with 0", "Techmenu: Lschung",MB_OK); //gfaRet = GetFileAttributes(dFileName); gfaRet = GetFileAttributesW(ucStrBuffer); if( gfaRet != INVALID_FILE_ATTRIBUTES ) { SetFileAttributes(dFileName, FILE_ATTRIBUTE_NORMAL); gfaRet = gfaRet & FILE_ATTRIBUTE_DIRECTORY; if( gfaRet ) { if( ! this->XDelDirectory(dFileName) ) { SetCursor(lhCursor); return FALSE; } } else { iRet = DeleteFileW(ucStrBuffer); } ... |
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Hi all! First off, happy new year to u.. I am writing a program under Linux designed to make a USB camera capture images, with KDevelop. The "instructions" or guide to writing the program can be found here: http://bytesex.org/v4l/spec/index.html I want the camera to capture images continuously, which I have accomplished but I also want to check that the memory is ... |
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The best, simplest, most reliable and easiest to debug way is to make a copy. I think there are other OS specific ways to shrink files in place, but it is trivial (unless, of course, you are at your limit on file space or the file is huge) to make a copy. |
main(void) { FILE * fp,* fw; char * line = NULL; size_t len = 0,len1=0,len2=0; char src[55],new_src[55]; char port[6]; int i,j,k,count=0,pos=0; fp = fopen("conf.apf", "r"); if (fp == NULL) exit(EXIT_FAILURE); fgets(src,50,fp); len=strlen(src); printf("\nEnter port number to be replaced : \n"); scanf("%s",port); len1=strlen(port); printf("%s and length of string %d\n", port,len1); strncpy(new_src,src,len); for (j=0; j |
#include #include int main() { FILE *in, *out; char ch; char *rdf,*wdf; int comma_count = 0; int wait_for_newline = 0; clrscr(); rdf="A:\\r.csv"; wdf="A:\\abl.csv"; in = fopen(rdf,"r"); out = fopen(wdf,"w"); if(in == NULL) { printf("Cannot open input file.\n"); exit(1); } if(out == NULL) { printf("Cannot open output file.\n"); exit(1); } while(!feof(in)) { ch = getc(in); if(ferror(in)) { printf("Read Error"); clearerr(in); ... |
hey guys, i was wondering if you could help me with my problem! i made a program that uses 3 arguments as inline commands: argv[0] is the name of the program) argv [1] is the name of the first file argv[2] is the name of the second file The purpose of the program is to write an inline command with these ... |
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You have got to explain what you are doing. Is seems incredible that you just want to wander around your hard drive deleting files with certain file types that have been created recently. How did the file get created in the first place? Was it by some action on your part? How can it be that you do not know the ... |
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