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  • Using C struct without including header file

    - by shams
    My basic problem is that I want to use some structs and functions defined in a header file by not including that header file in my code. The header file is generated by a tool. Since I don't have access to the header file, I can't include it in my program. Here's a simple example of my scenario: first.h #ifndef FIRST_H_GUARD #define FIRST_H_GUARD typedef struct ComplexS { float real; float imag; } Complex; Complex add(Complex a, Complex b); // Other structs and functions #endif first.c #include "first.h" Complex add(Complex a, Complex b) { Complex res; res.real = a.real + b.real; res.imag = a.imag + b.imag; return res; } my_program.c // I cannot/do not want to include the first.h header file here // but I want to use the structs and functions from the first.h #include <stdio.h> int main() { Complex a; a.real = 3; a.imag = 4; Complex b; b.real = 6; b.imag = 2; Complex c = add(a, b); printf("Result (%4.2f, %4.2f)\n", c.real, c.imag); return 0; } My intention is to build an executable for my_program and then use the linker to link up the executables. Is what I want to achieve possible in C?

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  • C++: Is windows.h generally an efficient code library?

    - by Alerty
    I heard some people complaining about including the windows header file in a C++ application. They mentioned that it is inefficient. Is this just some urban legend or are there really some real hard facts behind it? In other words, if you believe it is efficient or inefficient please explain how this can be with facts. I am no C++ Windows programmer guru. It would really be appreciated to have detailed explanations.

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  • Search in big text log files

    - by 0xFF
    Hi, let's say you have an game server which creating text log files of gamers actions, and from time to time you need to lookup something in those logs files (like investigating an scam or loosing an item). Just for example you have 100 files and each file have size between 20MB and 50MB - How you would search them quickly? What I have already tried to do is create several threads and each invidual thread will map his own file to memory (let say memory should not be problem if it not exceed 500MB of ram) perform search here, result was something around 1 second per file : File:a26.log - read in: 0.891, lines: 625282, matches: 78848 Is there better way how to do that ? - because it seems to me kinda slow. thanks. (java was used for this case)

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  • Using Linux C code and header files to compile a Windows DLL

    - by df382
    I would like to know if in general it is possible to create a C++ DLL with Visual C++ 2010 starting from C code and the header files I find in a Linux distribution. Theoretically, if I take a piece of C code (that includes different header files) from Linux and I find in the Linux file system all the header files needed for the linkage of the project, will I be able to successfully compile the project in Windows with Visual C++ 2010? Are there some examples or a tutorial for doing this? After compiling a DLL, I would like to use it in a C# application, which I will run under Linux with Mono.

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  • Use the keyword class as a variable name in C++

    - by Leif Andersen
    I am having trouble writing C++ code that uses a header file designed for a C file. In particular, the header file used a variable name called class: int BPY_class_validate(const char *class_type, PyObject *class, PyObject *base_class, BPY_class_attr_check* class_attrs, PyObject **py_class_attrs); This works in C as class isn't taken as a keyword, but in C++, class is. So is there anyway I can #include this header file into a c++ file, or am I out of luck? Thank you.

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  • How does file creation work in Java

    - by Ankur
    I am trying to create a file using File newFile = new File("myFile"); However no file called "myFile" is created. This is within a Web application Project i.e. proper form to be pakaged as a WAR but I am calling it as part of a main method (just to see how this works). How can I make it so that a new file is created at a location relative to the current one i.e not have to put in an absolute path.

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  • another file_exists with special chars problem

    - by Camran
    I have some folders with special characters in their names. I run currently at a test-computer with Windows OS, but later I will use LINUX. My problem is that the folders with special chars in their names cannot be recognized somehow. ex: file_exists('../Bilar/27733691_1.jpg') // TRUE file_exists('../Båtar/27733691_1.jpg') // FALSE because of the special char in folder name... How should I solve this? I plan to run LINUX in the future when website is online... would that matter? Please explain thoroughly because I am a newb at this Thanks

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  • Copying files from one directory to another in Java

    - by user42155
    Hello, I want to copy files from one directory to another (subdirectory) using Java. I have a directory, dir, with text files. I iterate over the first 20 files in dir, and want to copy them to another directory in the dir directory, which I have created right before the iteration. In the code, I want to copy the review (which represents the ith text file or review) to trainingDir. How can I do this? There seems not to be such a function (or I couldn't find). Thank you. boolean success = false; File[] reviews = dir.listFiles(); String trainingDir = dir.getAbsolutePath() + "/trainingData"; File trDir = new File(trainingDir); success = trDir.mkdir(); for(int i = 1; i <= 20; i++) { File review = reviews[i]; }

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  • PHP: File exists and is in a certain sub-directory

    - by Svish
    I get a file path to a user file and I want to make sure that this path is to a valid existing user file and not to something bogus or a system file or something like that. I know I can use file_exists to check that it exists, but I'm not sure how I should make sure that the file is in a certain sub-directory...

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  • Split text files Accross threads

    - by Kevin
    The problem: I have a few text files (10) with numbers in them on every line. I need to have them split across some threads I create using the pthread library. these threads that are created (worker threads) are to find the largest prime number that gets sent to them (and over all the largest prime from all of the text files). My current thoughts on solutions: I am thinking myself to have two arrays and all of the text files in one array and the other array will contain a binary file that I can read say 1000 lines and send the pointer to the index of that binary file in a struct that contains the id, file pointer, and file position and let it crank through that. a little bit of what I am talking about pthread_create(&threads[index],NULL,calc_sqrt,(void *)threadFields[index]);//Pass struct to each worker Struct: typedef struct threadFields{ int *id, *position; FILE *Fin; }tField; If anyone has any insight or a better solution it would be greatly appreciated Thanks

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  • How do I write a Java text file viewer for big log files

    - by Hannes de Jager
    I am working on a software product with an integrated log file viewer. Problem is, its slow and unstable for really large files because it reads the whole file into memory when you view a log file. I'm wanting to write a new log file viewer that addresses this problem. What are the best practices for writing viewers for large text files? How does editors like notepad++ and VIM acomplish this? I was thinking of using a buffered Bi-directional text stream reader together with Java's TableModel. Am I thinking along the right lines and are such stream implementations available for Java?

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  • Scan Numbers among letters in a Sentence

    - by ZaZu
    Hello, I have a pretty easy question. (using C) In a sentence such as In this document, there are 345 words and 6 figures How can I scan 345 and 6 while ignoring all that is in between ? I tried fscanf(FILE *pointer,"%d %d",&words,&figs); But it only gets the first value ... What am I doing wrong ?

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  • How to change file contents in PHP ?

    - by Misha Moroshko
    I save in a file some info about users (like number of times user passed the login page, last visited time, and so on). I want to read this info from the file, and update it (add 1 to the counter, and change the last visited time). My question is: can I do it without opening the file twice ? I open the first time to read the contents, and then open it again to overwrite the contents with the updated ones. Thanks !

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  • Reading different data from a textfile delimited with semicolons in C.

    - by Chris_45
    How do one read different records of data that are separated with semicolons into an array in C? from textfile: Text One; 12.25; Text Two; 5; Text Three; 1.253 fopen ... for(i = 0; i < nrRecords; i++) { fscanf(myFile, " %[^;];", myRecords[i].firstText); /* Ok first text*/ fscanf(myFile, "%lf", &myRecords[i].myDouble1); /* But goes wrong with first double */ fscanf(myFile, " %[^;];", myRecords[i].secondText); fscanf(myFile, "%d", &myRecords[i].myInt1); fscanf(myFile, " %[^;];", myRecords[i].thirdText); fscanf(myFile, "%lf",&myRecords[i].myDouble2); } fclose...

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  • In a pre-commit hook - how to access/compare current and previous versions of files

    - by EthanML
    I'm trying to add to our existing pre-commit SVN hook so that it will check for and block an increase in file size for files in specific directory/s. I've written a python script to compare two file sizes, which takes two files as arguments and uses sys.exit(0) or (1) to return the result, this part seems to work fine. My problem is in calling the python script from the batch file, how to reference the newly committed and previous versions of each file? The existing code is new to me and a mess of %REPOS%, %TXN%s etc and I'm not sure how to go about using them. Is there a simple, standard way of doing this? It also already contains code to loop through the changed files using svnlook changed, so that part shouldn't be an issue. Thanks very much

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  • Is O_LARGEFILE needed just to write a large file?

    - by Daniel Trebbien
    Is the O_LARGEFILE flag needed if all that I want to do is write a large file (O_WRONLY) or append to a large file (O_APPEND | O_WRONLY)? From a thread that I read titled "Cannot write 2gb index file" on the CLucene-dev mailing list, it appears that O_LARGEFILE might be needed to write large files, but participants in that discussion are using O_RDWR, not O_WRONLY, so I am not sure.

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  • Howto disable the emacs site-start files permanently?

    - by elemakil
    When solving this problem I figured out that I need to disable the site-wise init files in order to get my emacs + CEDET running (everything works nicely when starting emacs using emacs --no-site-file but is broken without the additional argument). I'd like to disable the site-wise init files permanently but as I'm using several different approaches/methods when launching emacs (launcher/panel/terminal) I don't think aliasing it in my .zshrc won't work. I require a method to permanently disable all site-start files. Is there any easy way to achieve this? Thanks!

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  • PHP: csv generator creates extra field

    - by WhyKiki
    I'm coding a script that takes one csv file to transform it into another one. Basically, two foreach loops are used: one to iterate records and another to iterate fields. Certain fields (cno 25, 26, 44) for each record needs to be modified. The problem is that each modificatino creates an extra empty field, i.e. the code $colStr .= '"' . $col . '";'; works but not any of the code in the if statements. The code is: $rno = 0; foreach ($csvArray as $line) { $cno = 0; $colStr = ""; foreach ($line as $col) { if($rno>0 && $cno==25) { $stuff = array($csvArray[$rno][41], $csvArray[$rno][47], $csvArray[$rno][48], $csvArray[$rno][49]); foreach($stuff as &$value) { $value = preg_replace('/[^0-9]/', '', $value); } sort($stuff, SORT_NUMERIC); // Causes bug! $colStr .= '"' . $stuff[0] . '";'; } if($rno>0 && $cno==26) { $urls = ""; for($i = 55; $i<=62; $i++) { $urls .= "Images: " . $csvArray[$rno][$i] . " | "; } $urls .= "Some text: " . $csvArray[$rno][43] . " | "; // Causes bug! $colStr .= '"' . $urls . '";'; } if($rno>0 && $cno==44) { $colStr .= '"' . $_POST['location'][$rno] . '";'; } if($rno>0 && $cno==54) { $objType = $col; $objType = preg_replace('/foobar/i', '123', $objType); // Causes bug! $colStr .= '"' . $objType . '";'; } else { // This is ok, though $colStr .= '"' . $col . '";'; } $cno++; } $colStr = preg_replace('/;$/', '', $colStr); $colStr .= "\n"; fwrite($outputFile, $colStr); $rno++; } fclose($outputFile);

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