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| <h1>VLFeat.org</h1> |
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| Download - C library install - Using Xcode |
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| <p>These instructions show how to setup a basic <b>VLFeat</b> project |
| with Apple Xcode. For the sake of simplicty, we create a command |
| line tool written in C. However, these steps apply with minor |
| modifications to other project types and to the C++ lanuage.</p> |
|
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| <p>First, let us create a new project |
| called <code>vlfeat-client</code>. Open Xcode and select <b>File |
| > New Project > Command Line Utility > Standard Tool</b> |
| and click <b>Choose</b>. Give a name to your project (in our |
| case <code>vlfeat-client</code>), and click <b>Save</b>.</p> |
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| <div class="figure"> |
| <img src="images/using-xcode-new.png" alt="Xcode new project"></img> |
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|
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| <p>Now we need to add <b>VLFeat</b> to the C compiler include search |
| path. To do this, select the <code>vlfeat-client</code> target and |
| open the information panel (the blue button, |
| or <b>Command-i</b>). Then select the <b>Build</b> panel, search for |
| the field <b>Header Search Paths</b>, and add |
| <b>VLFeat</b> root path (in our case this is |
| just <code>~/src/vlfeat</code>).</p> |
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| <img src="images/using-xcode-info.png" alt="Xcode info"></img> |
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| <p>Next, we add the <code>libvl.dylib</code> library file to the |
| project resources so that Xcode links against it. To do this, drag |
| and drop the <code>libvl.dylib</code> file (in our example |
| <code>~/src/vlfeat/bin/maci/libvl.dylib</code>) to the left panel and click |
| <b>Add</b>.</p> |
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| <img src="images/using-xcode-dylib.png" alt="Xcode dylib"></img> |
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| <p>Next, edit the <code>main.c</code> source file and type the following code:</p> |
|
|
| <pre xml:space="preserve"> |
| #include <vl/generic.h> |
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|
| int main (int argc, const char * argv[]) { |
| VL_PRINT ("Hello world!") ; |
| return 0; |
| } |
| </pre> |
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| <img src="images/using-xcode-edit.png" alt="Xcode edit"></img> |
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| <p>If you try to build the project, it should compile without errors |
| (if you are using C++, do not forget to wrap the <code>include</code> |
| statements in a <code>extern "C" {}</code> block). However, if you try |
| to run the program, it will fail, complaining that it cannot find the |
| library image.</p> |
|
|
| <img src="images/using-xcode-err.png" alt="Xcode error"></img> |
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| <p>The reason is that <code>libvl.dylib</code> is compiled with the |
| library <code>install_name</code> equal |
| to <code>@loader_path/libvl.dylib</code>. This causes the run-time |
| loader to look for the library in the same directory of the |
| executable. There are two ways around this problem: The first is to |
| install the library in a standard location |
| (e.g. <code>/usr/local/lib</code>) and use the <code>otool</code> |
| command to change the |
| library <code>install_name</code>. The other is to simply copy |
| the <code>libvl.dylib</code> file in the executable directory. Here we |
| demonstrate the second technique.</p> |
|
|
| <p>To copy <code>libvl.dylib</code> in the executable directory, we |
| add a <b>Copy Files</b> build phase to the project. Right-click |
| the <code>vlfeat-client</code> target in the project panel and select |
| <b>Add > New Build Phase > New Copy Files Build |
| Phase</b>. Select <b>Destination: Executables</b>. Then drag-and-drop |
| the <code>libvl.dylib</code> item from the panel to the <b>Copy |
| Files</b> build phase.</p> |
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| <img src="images/using-xcode-copy.png" alt="Xcode copy"></img> |
| <img src="images/using-xcode-copy-2.png" alt="Xcode copy"></img> |
|
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| <p>Now rebuild the project, and run it. It should run correctly, |
| and if you open the debugger console you should see this:</p> |
|
|
| <img src="images/using-xcode-ok.png" alt="Xcode ok"></img> |
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| © 2005-09 Andrea Vedaldi and Brian Fulkerson |
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