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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 |
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with Apple Xcode. For the sake of simplicty, we create a command |
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line tool written in C. However, these steps apply with minor |
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modifications to other project types and to the C++ lanuage.</p> |
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<p>First, let us create a new project |
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called <code>vlfeat-client</code>. Open Xcode and select <b>File |
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> New Project > Command Line Utility > Standard Tool</b> |
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and click <b>Choose</b>. Give a name to your project (in our |
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case <code>vlfeat-client</code>), and click <b>Save</b>.</p> |
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<div class="figure"> |
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<img src="images/using-xcode-new.png" alt="Xcode new project"></img> |
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</div> |
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<p>Now we need to add <b>VLFeat</b> to the C compiler include search |
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path. To do this, select the <code>vlfeat-client</code> target and |
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open the information panel (the blue button, |
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or <b>Command-i</b>). Then select the <b>Build</b> panel, search for |
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the field <b>Header Search Paths</b>, and add |
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<b>VLFeat</b> root path (in our case this is |
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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 |
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project resources so that Xcode links against it. To do this, drag |
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and drop the <code>libvl.dylib</code> file (in our example |
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<code>~/src/vlfeat/bin/maci/libvl.dylib</code>) to the left panel and click |
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<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> |
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<pre xml:space="preserve"> |
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#include <vl/generic.h> |
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int main (int argc, const char * argv[]) { |
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VL_PRINT ("Hello world!") ; |
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return 0; |
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} |
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</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 |
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(if you are using C++, do not forget to wrap the <code>include</code> |
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statements in a <code>extern "C" {}</code> block). However, if you try |
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to run the program, it will fail, complaining that it cannot find the |
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library image.</p> |
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<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 |
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library <code>install_name</code> equal |
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to <code>@loader_path/libvl.dylib</code>. This causes the run-time |
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loader to look for the library in the same directory of the |
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executable. There are two ways around this problem: The first is to |
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install the library in a standard location |
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(e.g. <code>/usr/local/lib</code>) and use the <code>otool</code> |
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command to change the |
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library <code>install_name</code>. The other is to simply copy |
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the <code>libvl.dylib</code> file in the executable directory. Here we |
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demonstrate the second technique.</p> |
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<p>To copy <code>libvl.dylib</code> in the executable directory, we |
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add a <b>Copy Files</b> build phase to the project. Right-click |
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the <code>vlfeat-client</code> target in the project panel and select |
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<b>Add > New Build Phase > New Copy Files Build |
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Phase</b>. Select <b>Destination: Executables</b>. Then drag-and-drop |
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the <code>libvl.dylib</code> item from the panel to the <b>Copy |
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Files</b> build phase.</p> |
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<img src="images/using-xcode-copy.png" alt="Xcode copy"></img> |
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<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, |
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and if you open the debugger console you should see this:</p> |
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<img src="images/using-xcode-ok.png" alt="Xcode ok"></img> |
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</div> |
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<div class="clear"> </div> |
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</div> |
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<div id="footer"> |
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© 2005-09 Andrea Vedaldi and Brian Fulkerson |
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