In Go, it isn&#39;t typical to have a debug version or a release version.  

By default, `go build` combines symbol and debug info with binary files. However, you can remove the symbol and debug info with `go build -ldflags &quot;-s -w&quot;`.

You can instruct the linker to strip debug symbols by using

    go install -ldflags &#39;-s&#39;

I just tried it on a fairly large executable (one of the [GXUI][1] samples), and this reduced it from ~16M to ~10M. As always, your mileage may vary... 

[Here][2] is a full list of all linker options.


  [1]: https://github.com/google/gxui
  [2]: https://golang.org/cmd/link/

I got a error when i run android espresso test:

&gt; com.google.android.apps.common.testing.ui.espresso.PerformException: Error performing &#39;single click&#39; on view &#39;with id: is &lt;2131034173&gt;&#39;.

My code is easy:

    onView(withId(R.id.btn)).perform(click());

But there is no error with this code:

    onView(withId(R.id.btn)).check(matches(isDisplayed()));
	
I can not find the cause why it happen.

PerformException: Error performing &#39;single click&#39;

I had a lot of trouble figuring out how to use Apple&#39;s Hardware accelerated video framework to decompress an H.264 video stream.  After a few weeks I figured it out and wanted to share an extensive example since I couldn&#39;t find one.

My goal is to give a thorough, instructive example of Video Toolbox introduced in [WWDC &#39;14 session 513][1].  My code will not compile or run since it needs to be integrated with an elementary H.264 stream (like a video read from a file or streamed from online etc) and needs to be tweaked depending on the specific case.  

I should mention that I have very little experience with video en/decoding except what I learned while googling the subject.  I don&#39;t know all the details about video formats, parameter structure etc. so I&#39;ve only included what I think you need to know.

I am using XCode 6.2 and have deployed to iOS devices that are running iOS 8.1 and 8.2.

  [1]: https://developer.apple.com/videos/wwdc/2014/#513

How to use VideoToolbox to decompress H.264 video stream

In C, we can build a debug version or a release version of the binary files (the object files and the executable). How can we do this in Go? 

How to build a release version binary in Go?

<p>In C, we can build a debug version or a release version of the binary files (the object files and the executable). How can we do this in Go?</p>


A number of compilers provide 128-bit integer types, but none of the ones I&#39;ve used provide the typedefs `int128_t`. Why?

As far as I recall, the standard

   * Reserves `int128_t` for this purpose
   * Encourages implementations that provide such a type to provide the typedef
   * Mandates that such implementations provide an `intmax_t` of at least 128 bits

(and, I do not believe I&#39;ve used an implementation that actually conforms to that last point)

Why isn&#39;t there int128_t?

I learned from my colleague that one can write and execute a C program without writing a `main()` function. It can be done like this:

`my_main.c`

    /* Compile this with gcc -nostartfiles */
    
    #include &lt;stdlib.h&gt;
    
    void _start() {
      int ret = my_main();
      exit(ret); 
    }
 
    int my_main() {
      puts(&quot;This is a program without a main() function!&quot;);
      return 0; 
    }

Compile it with this command:

    gcc -o my_main my_main.c –nostartfiles

Run it with this command:
 
    ./my_main

When would one need to do this kind of thing? Is there any real world scenario where this would be useful?

What is the use of _start() in C?

I found the following code:

    int func_prim (int zahl) {
        int count;
        if (zahl &lt; 0)
            return -1;

        for (count = 2; zahl % count != 0 &amp;&amp; zahl &gt;= count; count++);
        if (count == zahl)
            return 1;
        return 0;
    }


The point of function is to check whether a number is a prime number or not.

I don&#39;t understand why the for-loop has `;` at the end:

                                                                v
    for (count = 2; zahl % count != 0 &amp;&amp; zahl &gt;= count; count++);

Without that, the code doesn&#39;t work properly.

What is the explanation?


What is the purpose of &quot;;&quot; at the end of for loop?

    int func(char* str)
    {
       char buffer[100];
       unsigned short len = strlen(str);
    
       if(len &gt;= 100)
       {
            return (-1);
       }
       
       strncpy(buffer,str,strlen(str));
       return 0;
    }

This code is vulnerable to a buffer overflow attack, and I&#39;m trying to figure out why. I&#39;m thinking it has to do with `len` being declared a `short` instead of an `int`, but I&#39;m not really sure.

**Any ideas?**

Why is this code vulnerable to buffer overflow attacks?

Some people are not aware that it&#39;s [possible to pass and return structs by value in C](https://stackoverflow.com/questions/9653072/return-a-struct-from-a-function-in-c). My question is about the compiler making unnecessary copies when returning structs in C.  Do C compilers such as GCC use [Return value optimization(RVO)](https://en.wikipedia.org/wiki/Return_value_optimization) optimization or is this a C++ only concept? Everything I have read about RVO and copy elision is in regards to C++.

Let&#39;s consider an example.
I&#39;m currently implementing a [double-double data type](https://en.wikipedia.org/wiki/Quadruple-precision_floating-point_format#Double-double_arithmetic) in C (or rather float-float to start with because I find it easy to unit test).  Consider the following code.

    typedef struct {
    	float hi;
    	float lo;
    } doublefloat;
    
    doublefloat quick_two_sum(float a, float b) {
    	float s = a + b;
    	float e = b - (s - a);
    	return (doublefloat){s, e};
    }

Will the compiler make a temporary copy of the `doublefloat` value I return or can the temporary copy be elided?

What about named return value optimization (NRVO) in C?  I have another function 

    doublefloat df64_add(doublefloat a, doublefloat b) {
    	doublefloat s, t;
    	s = two_sum(a.hi, b.hi);
    	t = two_sum(a.lo, b.lo);
    	s.lo += t.hi;
    	s = quick_two_sum(s.hi, s.lo);
    	s.lo += t.lo;
    	s = quick_two_sum(s.hi, s.lo);
    	return s;
    }

In this case i&#39;m returning a named struct. Can the temporary copy in this case be elided?

It should be stated that this is a general question for C and that the code examples I have used here are only examples (when I optimize this I will be using SIMD with intrinsics anyway). I&#39;m aware that I could look at the assembly output to see what the compiler does but I think this is an interesting question nevertheless.

Return value optimization and copy elision in C

GitLab is a free, open-source way to host private `.git` repositories but it does not seem to work with Go. When you create a project it generates a URL of the form:

    git@1.2.3.4:private-developers/project.git

where:

- `1.2.3.4` is the IP address of the gitlab server
- `private-developers` is a user group which has access to the private repo

Golang 1.2.1 doesn&#39;t seem to understand this syntax.

    go get git@1.2.3.4:private-developers/project.git

results in:

    package git@23.251.148.129/project.git: unrecognized import path &quot;git@1.2.3.4/project.git&quot;

Is there a way to get this to work?

How to use Go with a private GitLab repo

How can I write a message to Stderr without using `log`?

[A comment in this SO post](https://stackoverflow.com/questions/28934859/how-to-print-message-to-stderr-in-go) shows how to do it with `log`: `log.Println(&quot;Message&quot;)`, but what if I don&#39;t want a timestamp?

Is the following good Go?

`os.Stderr.WriteString(&quot;Message&quot;)`




How can I print to Stderr in Go without using log

In my project, I have a byte slice from a request&#39;s response.

    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        log.Println(&quot;StatusCode为&quot; + strconv.Itoa(resp.StatusCode))
        return
    }
    
    respByte, err := ioutil.ReadAll(resp.Body)
    if err != nil {
    log.Println(&quot;fail to read response data&quot;)
        return
    }

This works, but if I want to get the response&#39;s body for `io.Reader`, how do I convert? I tried the newreader/writer but wasn&#39;t successful.

Convert byte slice to io.Reader

I have a problem trying to import a type from another package and file. The struct that I&#39;m trying to import is the one underneath.

    type PriorityQueue []*Item

    type Item struct {
	   value string
	   priority int   
	   index int 
    }


If I would put the PriorityQueue alongside with all of its methods in the same file I&#39;d declare it with
 

    pq:= &amp;PriorityQueue{}

I&#39;ve been searching the internet like a madman for an answer on this simple question but I have not found an answer. I usually program in java and import classes is so elementary. 


Import struct from another package and file golang

I need to make a copy of a slice in Go and reading the docs there is a [copy][1] function at my disposal. 

&gt; The copy built-in function copies elements from a source slice into a
&gt; destination slice. (As a special case, it also will copy bytes from a
&gt; string to a slice of bytes.) The source and destination may overlap.
&gt; Copy returns the number of elements copied, which will be the minimum
&gt; of len(src) and len(dst).

But when I do:

    arr := []int{1, 2, 3}
	tmp := []int{}
	copy(tmp, arr)
	fmt.Println(tmp)
	fmt.Println(arr)

My `tmp` is empty as it was before (I even tried to use `arr, tmp`):

    []
    [1 2 3]


You can check it on go [playground][2]. So why can not I copy a slice?

  [1]: http://golang.org/pkg/builtin/#copy
  [2]: https://play.golang.org/p/iE6TarF8-S

Why can&#39;t I duplicate a slice with `copy()`?

I&#39;m very new to the Ionic framework :)

    &gt;npm install -g cordova
    &gt;npm install -g ionic
    &gt;ionic start test blank
    &gt;cd test
    &gt;ionic platform add android

When I use &#39;`&gt;ionic build android`&#39; start download gradle, but I can&#39;t download and get an error.

What caused this error and how can I fix it?!

I download Gradle and install it on a PC, but it wants to download again.
Can I add Gradle to a project offline?

    C:\Users\LENOVO2014\test&gt;ionic build android
    running cordova build android
    Running command: &quot;C:\Program Files\nodejs\node.exe&quot; C:\Users\LENOVO2014\myApp\ho
    oks\after_prepare\010_add_platform_class.js C:\Users\LENOVO2014\myApp
    add to body class: platform-android
    Running command: C:\Users\LENOVO2014\myApp\platforms\android\cordova\build.bat
    ANDROID_HOME=D:\program\Programing\Android\sdk
    JAVA_HOME=C:\Program Files\Java\jdk1.8.0_31
    Running: C:\Users\LENOVO2014\myApp\platforms\android\gradlew cdvBuildDebug -b C:
    \Users\LENOVO2014\myApp\platforms\android\build.gradle -Dorg.gradle.daemon=true
    Downloading http://services.gradle.org/distributions/gradle-2.2.1-all.zip
    ................................................................................
    ................................................................................
    ................................................................................
    ............................................
    Exception in thread &quot;main&quot; java.lang.RuntimeException: java.net.SocketException:
     Connection reset
            at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAcc
    essManager.java:78)
            at org.gradle.wrapper.Install.createDist(Install.java:47)
            at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
            at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
    Caused by: java.net.SocketException: Connection reset
            at java.net.SocketInputStream.read(SocketInputStream.java:189)
            at java.net.SocketInputStream.read(SocketInputStream.java:121)
            at java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
            at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
            at sun.net.www.MeteredStream.read(MeteredStream.java:134)
            at java.io.FilterInputStream.read(FilterInputStream.java:133)
            at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Http
    URLConnection.java:3335)
            at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Http
    URLConnection.java:3328)
            at org.gradle.wrapper.Download.downloadInternal(Download.java:63)
            at org.gradle.wrapper.Download.download(Download.java:45)
            at org.gradle.wrapper.Install$1.call(Install.java:60)
            at org.gradle.wrapper.Install$1.call(Install.java:47)
            at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAcc
    essManager.java:65)
            ... 3 more

    C:\Users\LENOVO2014\myApp\platforms\android\cordova\node_modules\q\q.js:126
                        throw e;
                              ^
    Error code 1 for command: cmd with args: /s /c &quot;C:\Users\LENOVO2014\myApp\platfo
    rms\android\gradlew cdvBuildDebug -b C:\Users\LENOVO2014\myApp\platforms\android
    \build.gradle -Dorg.gradle.daemon=true&quot;
    ERROR building one of the platforms: Error: C:\Users\LENOVO2014\myApp\platforms\
    android\cordova\build.bat: Command failed with exit code 1
    You may not have the required environment or OS to build this project
    Error: C:\Users\LENOVO2014\myApp\platforms\android\cordova\build.bat: Command fa
    iled with exit code 1
        at ChildProcess.whenDone (C:\Users\LENOVO2014\AppData\Roaming\npm\node_modul
    es\cordova\node_modules\cordova-lib\src\cordova\superspawn.js:131:23)
        at ChildProcess.emit (events.js:110:17)
        at maybeClose (child_process.js:1015:16)
        at Process.ChildProcess._handle.onexit (child_process.js:1087:5)


Ionic build Android error when downloading Gradle

For a new module I&#39;m trying to use [`npm build`][1] without gulp / Grunt / other specialised build tools.

    &quot;scripts&quot;: {
  	  &quot;build&quot;: &quot;node build.js&quot;
    },

My build.js is simply

    console.log(&#39;Hello&#39;)

However, running

    npm build

Simply exits without printing anything, with a status of 0. 

Running:

    npm install

Also does all the normal things, but does not run build.js either.

**How can I make npm run my build script?**

Edit: even simple bash commands don&#39;t seem to work, eg 

    &quot;scripts&quot;: {
  	    &quot;build&quot;: &quot;touch TESTFILE&quot;
    },

Doesn&#39;t make a file with that name.

  [1]: https://docs.npmjs.com/cli/build

`npm build` doesn&#39;t run the script named &quot;build&quot; in package.json

How can I run a job created in Jenkins every one minute ? Am I missing anything?

PS: I&#39;m trying not to use: ***/1 * * * ***

![enter image description here][1]
![enter image description here][2]


  [1]: http://i.stack.imgur.com/cBCvw.jpg
  [2]: http://i.stack.imgur.com/JEBqz.jpg

Run a Jenkins job every one minute using H/1 * * * *

I have build errors in my Xcode project (Objective-C), and I no longer &quot;stumble upon&quot; the build command string nor the build output logs. This is Xcode 6.3.1.

All I can inspect is a left-side panel listing errors/warnings.

I want the build command and build console output to compare between two projects; there&#39;s a platform-specific issue present in one but not the other; my intuition says that the build settings are different between the two and that seeing the output would be the easiest way to identify the diff.

How do I get to see the build command string, and, the build output logs in this xcode?

Xcode - how to see build command and log?

New Go programmers often don&#39;t know or get confused what the fundamental go build command does.

What do exactly the `go build` and `go install` commands build and where do they put the result/output?

What does go build build? (go build vs. go install)

 - What is it exactly?
 - For what is it used?  
 - How widespread is the usage?  
 - How is it usually used?  



What exactly is a Release in GitHub?

I&#39;d like to publicate my app to GooglePlay but first i would like to do a last testing with the signed apk to ensure that all of the used API keys are working correctly with the release version (GMaps, Facebook, etc)

So i just **made a signed version of my app with our release key** and when i try to install the app to the device **i got an error:**

 [![enter image description here][1]][1]


I have tried to copy the apk to the device and **install it with an apk installer app.**

Strange thing is when i do the same process **with debug signing key, all is well, I can install and run the app.**

Here are the **steps of the procedure:**

I select the **release key**, type password.

[![Here are the steps of the procedure:][2]][2]

I do **select release build type** instead of debugging

[![I do select release build type instead of debugging][3]][3]


Just in case **i also defined in the gradle file the signing keys** but I must admit i dont know is it necessary.

[![Just in case i also defined in the gradle file the signing keys but I must admit i dont know is it necessary.][4]][4]


I tried like 7 seven times now so i assume this problem is **not just a 
mistyped password**, also **I can make this work with the standard debug android signing key.**


Please help if you can.




  [1]: http://i.stack.imgur.com/ck3uM.png
  [2]: http://i.stack.imgur.com/bWk81.png
  [3]: http://i.stack.imgur.com/joqXA.png
  [4]: http://i.stack.imgur.com/DZ6uM.png

Cannot install signed apk to device manually, got error &quot;App not installed&quot;

How do I get my SHA1 Keys for debug and release using android studio on a mac?
(These are required for Google API Keys)

SHA1 Key for DEBUG &amp; RELEASE ANDROID STUDIO MAC , How to generate SHA1 Release Keys in Mac?

### Background

I have an ASP.NET MVC application project, along with various other projects within a Visual Studio solution. The different projects use various versions of the NPoco library as follows:

* The MVC project includes a version of NPoco through NuGet.
* Some other projects include a (probably different) version of NPoco through a reference to a DLL (not the DLL provided through NuGet).
* One of the projects is the source code of a version of NPoco with some alterations made.

I&#39;m using Visual Studio 2015 Update 3 14.0.25422.01.

### Error
For some reason, when I launch this application in the debugger using the normal Start Debugging command in Visual Studio, it launches, but it also produces the following warning:

[![You are debugging a Release build of NPoco.dll. Using Just My Code with Release builds using compiler optimizations results in a degraded debugging experience (e.g. breakpoints will not be hit).][1]][1]

If I press **Continue Debugging**, everything seems to still work as usual, including breakpoints.

This problem only started happening recently.

### Question

1. Anyone know what caused the above error?
2. Do I have something misconfigured?


  [1]: http://i.stack.imgur.com/1r09x.png

Error: You are debugging a Release build of X.dll

I&#39;ve been developing my first app for work and am having trouble removing an earlier version from the Google Play Console.

My first release was version 2, which I released on the Internal Test track, as much as an experiment to understand the working of things.  I have subsequently release the app up to version 8, always targeting Alpha/Closed Track and had no problems with them.

However my first release, the one in Internal test track, simply refuses to go away.  All the others I have found I can click MANAGE then RELEASE TO BETA then DISCARD (at the bottom) and they go away, but not this one.

Can anyone help me with this please.  I have to say that the websites for releasing to both Android and to Apple do leave much to be desired - a bit of a baptism of fire to get your first app out there, even just to testers.

Content Type	Original Author	Original Content on Stackoverflow
Question	catric mia	View Question on Stackoverflow
Solution 1 - C	hiwjd0	View Answer on Stackoverflow
Solution 2 - C	rob74	View Answer on Stackoverflow

How to build a release version binary in Go?

C Problem Overview

C Solutions

Solution 1 - C

Solution 2 - C

How to use VideoToolbox to decompress H.264 video stream

PerformException: Error performing 'single click'

Attributions