fopen

Using fopen() in Objective-C

由 主宰稳场 提交于 2019-12-21 09:14:19
问题 I am puzzled by a crash I keep getting due to an error at this section of code: FILE *fid200; fid200 = fopen ( "Length200Vector.txt" , "w" ); if (fid200 == NULL) perror("Error opening Length200Vector.txt"); for (int n = 0; n<200; n++) { if (n == 0) { fprintf (fid200, "%f", self.avgFeatureVect[0][n]); } else { fprintf (fid200, ", %f", self.avgFeatureVect[0][n]); } } fprintf (fid200, "\n"); fclose(fid200); The error is: Error opening Length200Vector.txt: Operation not permitted. The file is

PHP - Safe way to download large files?

由 与世无争的帅哥 提交于 2019-12-21 06:18:38
问题 Information There are many ways to download files in PHP, file_get_contents + file_put_contents, fopen, readfile and cURL. Question? When having a large file, let's say 500 MB from another server / domain, what is the "correct" way to downloaded it safe? If connection failes it should find the position and continue OR download the file again if it contains errors. It's going to be used on a web site, not in php.exe shell. What I figured out so far I've read about AJAX solutions with progress

How to access resource image with fopen?

由 不羁岁月 提交于 2019-12-20 07:28:06
问题 I use fopen(filename.c_str(), "rb"); in Qt with images resources. But fopen wants a full path. It doesn't work if my filename is :/images/img.png ! 回答1: fopen is not part of Qt. Qt's resource system only works with Qt classes. See the Qt documentation of Using Resources in the Application for details. The Qt classes which work for resources first check if the given filename starts with the resource marker ( : ) and if so, they look up the resource internally (no physical file is opened!),

fopen returns Resource id #4

由 那年仲夏 提交于 2019-12-20 03:56:10
问题 <?php $handle = fopen("https://graph.facebook.com/search?q=mark&type=user&access_token=2227470867|2.mLWDqcUsekDYZ_FQQXYnHw__.3600.1279803600-100001317997096|YxS1eGhjx2rpNYLNE9wLrfb5hMc.", "r"); echo $handle; ?> Why does it echo Resource id #4 instead of the page itself? 回答1: Because fopen returns a resurce pointer to the file, not the content of the file. It simply opens it for subsequent reading and/or writing, sependent on the mode in which you opened the file. You need to fread() the data

fread a lot slower for downloads than readfile

由 左心房为你撑大大i 提交于 2019-12-20 00:42:42
问题 I'm serving downloads from a URL to my users through a PHP script. When using readfile() I get the maximum download speed my connection can support (about 2.5MB/s) however when I use the fopen, fread, fclose route the download speed is very, very slow (about 1-2KB/s). Here's my code: header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename=' . $filename); header('Content-Transfer-Encoding: binary');

clear/truncate file in C when already open in “r+” mode

由 自古美人都是妖i 提交于 2019-12-19 19:48:09
问题 My code currently looks something like this (these steps splitted into multiple functions): /* open file */ FILE *file = fopen(filename, "r+"); if(!file) { /* read the file */ /* modify the data */ /* truncate file (how does this work?)*/ /* write new data into file */ /* close file */ fclose(file); } I know I could open the file with in "w" mode, but I don't want to do this in this case. I know there is a function ftruncate in unistd.h / sys/types.h , but I don't want to use these functions

Grabbing CSV over cURL in PHP

由 我只是一个虾纸丫 提交于 2019-12-19 12:01:08
问题 Unfortunately, I cannot use either fopen or file_get_contents, so my working script has become a broken one using cURL: $ch = curl_init(); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $tmp = curl_exec($ch); curl_close($ch); header("Content-type: application/csv"); header(Content-Disposition: attachment; filename=$start.csv"); header("Pragma: no-cache"); header("Expires: 0"); echo $tmp; URL going in is a CSV file - and

php中socket、fsockopen、curl、stream 区别

由 不想你离开。 提交于 2019-12-19 09:51:54
socket 水泥、沙子，底层的东西 fsockopen 水泥预制件，可以用来搭房子 curl 毛坯房，自己装修一下就能住了 水泥、沙子不但可以修房子，还能修路、修桥、大型雕塑。socket也是，不但可以用于网页传输，还能传送其他东西，可以做聊天工具、下载器、ftp……几乎可以用网络传送的东西都能用它写出来，当然，需要掌握的知识也不少，例如建墙你就要知道怎么让墙笔直、不易倒、防冻、隔热等等都需要自己学 预制件你就不用管它是否笔直、结构如何、怎样隔热了，这些造的人帮你想好了，你想的就是怎样搭成你想要的形状就行。fsockopen就是，你可以忽略socket里面的creat, connect, send, recv等等函数的用法，直接就open了 毛坯房就更简单了，你装修就能住，最简单刷墙就行了，但想更舒适，就用更多更好的装修材料吧，但缺点就是——这是房子，你不能把它改造为渡河、交通的用途，只能住 curl也一样，各种连接什么的都帮你做好了，底层容错处理也做了，你就传参数给它就能得到你想要的结果，但缺点就是只能http / ftp，你想把它改成聊天工具，那就难难难了 stream_socket_client 和 fsockopen 没有本质上的区别 socket 是一个封装了 TCP/IP 操作的工具包 stream_socket_client 和 fsockopen 分属不同流派的对

PHP file_get_contents after php has evaluated

由 强颜欢笑 提交于 2019-12-19 03:35:13
问题 I know how to use file_get_contents and fopen etc, but when I do it to one of my own file, I get the literal string, meaning, the code is not preprocessed! How can i import text from a file without using require etc. because I want to store the value into a string 回答1: See examples #5 and #6 on the manual. Taken straight from there: $string = get_include_contents('somefile.php'); function get_include_contents($filename) { if (is_file($filename)) { ob_start(); include $filename; $contents = ob

How to get fopen to timeout properly?

由 佐手、 提交于 2019-12-19 03:20:24
问题 I have the following snippet of php code if($fp = fopen($url, 'r')) { stream_set_timeout($fp, 1); stream_set_blocking($fp, 0); } $info = stream_get_meta_data($fp); I'd like the request to timeout after 1 second. If I put a sleep(20) in my $url that I'm reading, it just waits the whole 20 seconds and never times out. Is there a better way to do timeouts with fopen ? If I use ini_set('default_socket_timeout',2) above that code it times out properly but $info then becomes null so ideally I'd
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