objective c - This loop chokes on 50,000 lines on the iPhone... can I improve it so it doesn't? -

- 

  फ़ाइल * फ़ाइल = फ़ॉपन ([जीपीएसफ़ाइलपैथ यूटीएफ 8 स्ट्रिंग], "आर"); चार सी [1024]; जबकि (fgets (c, 1024, फ़ाइल)! = NULL) {NSString * cString = [[NSString alloc] initWithCString: c एन्कोडिंग: NSMacOSRomanStringEncoding]; NSArray * split = [cString घटकों से पृथकबिस्तरी: @ ","]; यदि ([विभाजित गिनती]! = 3) {continue; // यह केवल पहली पंक्ति पर होना चाहिए} gpx = [gpx stringByAppendingString: [NSString stringWithFormat: @ "& lt; trkpt lat = \"% @ \ "lon = \"% @ \ "& gt; & lt; / trkpt & gt; \ N \ n ", [विभाजित ऑब्जेक्टअटइंडएक्स: 0], [विभाजन ऑब्जेक्टअटइंडएक्स: 1]]]; }

जैसा कि दूसरों ने बताया है, आप बहुत सारे अस्थायी वस्तुओं का निर्माण कर रहे हैं। एक बहुत भयानक। उसके ऊपर, कम से कम जीपीएक्स वाले, अस्थायी वस्तुओं का आकार, लूप के प्रत्येक पास के साथ बढ़ रहा है। आप ऐसा कुछ करने की कोशिश कर सकते हैं: 

  NSMutableString * gpx = [NSMutableString स्ट्रिंग]; NSAutoreleasePool * पूल = [[एनएसएयूटीओरियसपुल आलोक] इनिट]; (NSString * पंक्ति में [[NSString stringWithContentsOfFile: जीपीएसफ़ाइलपैथ उपयोग किया गया एन्कोडिंग: NULL त्रुटि: NULL] घटकों से पृथकबिट्टी स्ट्रिंग: @ "\ n"]) {NSArray * split = [रेखा घटकों से पृथक किया गया है: @ ","]; [जीपीएक्स अनुच्छेद स्वरूप: @ "और लेफ्टिनेंट; ट्रिकट लेट = \"% @ \ "लेन = \"% @ \ "& gt; & lt; / trkpt & gt; \ n \ n", [विभाजित ऑब्जेक्टअटइंडेक्स: 0], [विभाजन ऑब्जेक्टअटइंडेक्स: 1 ]]; } [पूल रिलीज]; पूल = नल;

यह उदाहरण gpsFilePath में मौजूद सामग्री को लोड करता है और इसे नई लाइनों से विभाजित करता है फिर, प्रत्येक पंक्ति के लिए, यह लाइन को अल्पविराम पर विभाजित करता है, और परिणामों को अस्थिर स्ट्रिंग gpx से जोड़ देता है यह प्रोसेसिंग भाग लपेटता है जो ऑटोरिवेट पूल में बहुत से अस्थायी ऑब्जेक्ट बनाता है, इसलिए जितनी जल्दी हो सके उन्हें त्याग दिया जाता है।

अंत में, चर gpx में संसाधित परिणाम होंगे ।


Comments

Post a Comment

Popular posts from this blog

c# - ListView onScroll event -

-
I am programming a simple C # application, and I need a Scallow event on the list view. So I inherited the original ListView class created in ListviewEx witch. I found out how to locate the scroll message from WinAPI and I modified the WndProc method. Now I have this WndProc: protected override zero WndProc (Ref message message) {base.WndProc (Ref I); If (m.msg == WM_VSCROLL) {onScroll (This, New EventArgs ()); }} But the problem is, I do not know how to know about scrolling information. This data should be in wParam, but there is a LOWORD macro ++ like in C in C # and I switch to find the criteria like SB_ below, SB_ENDSCROLL, SB_PAGEUP etc. there any way Need to change the LOWORD macro from C #? Or any other way to find the necessary parameters about scrolling? You can define the WParam constants as the following: Private const int WM_HSCROLL = 0x114; Private Constant WM_VSCROLL = 0x115; Private contact int SBHOZZ = 0; Private Consultant SB_VERT = 1; Private Con...
Read more

PHP - get image from byte array -

-
I am trying to create a back-end for my mobile application. I am sending the content of an image in the body of the HTTP request (output stream) as a byte array, I want to read this stream of bytes in PHP scripts and take back an image. Can anyone tell me how can I do this? Thank you. You can obtain the request body $ body = Reading from file_get_contents ('php: // input'); What you do with that data Depending on you, you can write the data in a file as you mentioned that this is image data, you can drop the data into the object can do. Another option is to use and load the image.
Read more

Linux Terminal Problem with Non-Canonical Terminal I/O app -

-
I have a small app written in C to run on Linux. Part of the app accepts user-input from keyboard , And it uses non-canonical terminal mode so that it can respond to each keystroke. The section of the code that accepts input is a simple task that is called repeatedly in the loop: char get_input () {char C = 0; Int res = reading (input_tamille, & amp; c, 1); If (RSS == 0) 0 returns; If (res == -1) {/ * snip error handling * /} return c; } It reads a letter from the terminal if there is no input within a given time limit, (c_cc [VTIME] value in the vocabulary structure), read () 0 And get_input () is called again It all works very well, I have recently discovered that if you run this app in a terminal window, and then the app Close the terminal window without ending, the app will not exit Received, but CPU intensive launches into an infinite loop, where the read () returns 0 without waiting continued. So how can I get out of the apple if it runs from the terminal win...
Read more