fwrite

fread'ing and fwrite'ing a structure that contains pointers [duplicate]

由 大兔子大兔子 提交于 2019-12-20 06:26:11
问题 This question already has answers here : Writing and reading (fwrite - fread) structures with pointers (3 answers) Closed 4 years ago . gcc (GCC) 4.7.0 c89 Hello, I have the following structure that I am trying to fwrite and fread. However, because my device and resource are pointers. The fwrite will read the pointer values and not the data. I cannot use a array for the device or resource. Only pointers as they have to be dynamically allocated. I allocate all memory for the structure elements

Appending content of text file to another file in C++

由 ℡╲_俬逩灬. 提交于 2019-12-20 03:29:08
问题 How can you open a text file and append all its lines to another text file in C++? I find mostly solutions for separate reading from a file to a string, and writing from a string to a file. Can this elegantly be combined? It is not always given that both files exist. There should be a bool return when accessing each of the files. I'm sorry if this is already off-topic: Is appending text content to a file conflict-free in the meaning that multiple programs can do this simultaneously (the order

Save content of a div to new file with jQuery AJAX and PHP

由 拈花ヽ惹草 提交于 2019-12-20 02:40:08
问题 I'm trying to save contents of a div to new html file. I'm using jQuery AJAX to send data to php. However, the php in its current form writes an empty file. Html: <div id="data2save"> <span>data1</span> <span>data2</span> <span>data3</span> <span>data4</span> </div> <input type="button" value="save" id="save"> JQuery: $("#save").live("click",function() { var bufferId =$("#data2save").html(); $.ajax({ method : "POST", url : "saver.php", data: {id : bufferId}, dataType: "html", success:

fwrite writing from beginning without removing

由 六眼飞鱼酱① 提交于 2019-12-18 13:38:36
问题 I am using PHP and fwrite code, but I want every write position to start from the beginning of the file without erasing it's content. I am using this code but it is writing to the end of the file. $fr = fopen("aaaa.txt", "a"); fwrite($fr, "text"); fclose($fr); 回答1: So you want to write at the beginning of a file, leaving all of its current contents after the new data? You'll have to grab its existing contents first, then append it back into the file once you've overwritten with your new data.

What's more efficient - storing logs in sql database or files?

由 我是研究僧i 提交于 2019-12-18 12:47:47
问题 I have few scripts loaded by cron quite often. Right now I don't store any logs, so if any script fails to load, I won't know it till I see results - and even when I notice that results are not correct, I can't do anything since I don't know which script failed. I've decided to store logs, but I am still not sure how to do it. So, my question is - what's more efficient - storing logs in sql database or files? I can create 'logs' table in my mysql database and store each log in separate row,

iphone利用AudioQueue播放wav(PCM码)

由 烂漫一生 提交于 2019-12-17 10:54:52
续上一篇 iphone利用AudioQueue播放音频文件(mp3,aac,caf,wav等） 绝对原创，转载请注明出处： http://www.cnblogs.com/xuanyuanchen/admin/EditPosts.aspx?postid=2450169 1、ffmpeg解码音频流并且保存成wav文件。 　这一步比较简单，只要熟悉ffmpeg解码音频的流程，将解码出的pcm码，保存到本地文件中，并实时统计解码的pcm的字节长度，最后解码完成之后再添加44字节的wav文件头。 save_audio.c View Code 1 #include <stdio.h> 2 #include "libavformat/avformat.h" 3 #include "libavcodec/avcodec.h" 4 #include "libavutil/avutil.h" 5 static void writeWavHeader(AVCodecContext *pCodecCtx,AVFormatContext *pFormatCtx,FILE *audioFile) { 6 int8_t *data; 7 int32_t long_temp; 8 int16_t short_temp; 9 int16_t BlockAlign; 10 int bits=16; 11 int32

Overwrite Line in File with PHP

由 一曲冷凌霜 提交于 2019-12-17 07:41:13
问题 What is the best way to overwrite a specific line in a file? I basically want to search a file for the string '@parsethis' and overwrite the rest of that line with something else. 回答1: If the file isn't too big, the best way would probably be to read the file into an array of lines with file(), search through the array of lines for your string and edit that line, then implode() the array back together and fwrite() it back to the file. 回答2: If the file is really big (log files or something

用来获取豆瓣网上电影信息的简介

由 强颜欢笑 提交于 2019-12-16 21:52:22
<?php //搜索链接 function search_link($moviename) { //构造url，其中max-results可根据需要更改 $urlString = 'http://api.douban.com/movie/subjects?q='.$moviename.'&start-index=1&max-results=1&alt=json'; //print_r($urlString); $urlString=mb_convert_encoding($urlString, "UTF-8", "GBK");//将Url转换为utf-8编码 $r = new HttpRequest($urlString,HttpRequest::METH_GET);//请求 $response = $r->send(); $result = $r->getResponseBody(); $obj = json_decode($result);//解析成json格式 if($entry = @$obj->{'entry'}){ //搜索链接并存在数组中返回 for($i = 0;$i<sizeof($entry);$i++){ $link=$entry[$i]->{'link'}; for($j = 0;$j<sizeof($link);$j++){ $arr = (array)

Writing PHP file not working

由 半城伤御伤魂 提交于 2019-12-14 03:29:57
问题 I'm trying to dynamically write PHP files using the fwrite() function and it just does not seem to be working. The code is definitely in the string being written, but then when I open the file that was written it just isn't there! My assumption is that the PHP compiler is, for whatever reason, reading the PHP tags in the string, executing what's between them, and then abandoning them. Is this assumption accurate? What can I do to get around it? The code looks something like this: $code = "<

Writing integer values to a file in binary using C

由 烈酒焚心 提交于 2019-12-14 02:27:15
问题 I am trying to write 9 bit numbers to a binary file. For example, i want to write the integer value: 275 as 100010011 and so on. fwrite only allows one byte to be written at a time and I am not sure how to manipulate the bits to be able to do this. 回答1: You have to write a minimum of two bytes to store a 9-bits value. An easy solution is to use 16 bits per 9 bits value Choose a 16 bits unsigned type, eg uint16_t and store the 2 bytes uint16_t w = 275; fwrite(&w, 1, 2, myfilep); Reading the
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