taglib | 易学教程

JSP Custom Taglib: Nested Evaluation

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Say I have my custom taglib: <%@ taglib uri="http://foo.bar/mytaglib" prefix="mytaglib"%> <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%> <mytaglib:doSomething> Test </mytaglib:doSomething> Inside the taglib class I need to process a template and tell the JSP to re-evaluate its output, so for example if I have this: public class MyTaglib extends SimpleTagSupport { @Override public void doTag() throws JspException, IOException { getJspContext().getOut().println("<c:out value=\"My enclosed tag\"/>"); getJspBody().invoke(null); } } The output I have is: <c:out value="My enclosed tag"/

Why use <g:textField /> in Grails?

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What is the reason to use g:textField in Grails if you're already familiar with standard HTML form tags? If I understand correctly the following two markup alternatives are equivalent: <input type="text" name="name" value="${params.name}" id="name" /> <g:textField name="name" value="${params.name}" /> Are there any circumstances under which using g:textField would add value? Am I missing something? The textField tag is provided as a convenience (slightly shorter than writing the HTML input) and is there to provide a full set of form tags. Personally I prefer to write as much plain HTML as

JSP Tag Files in subdirectories, using a single taglib prefix. Is that possible?

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I currently have my .tag files declared with: <%@taglib prefix="t" tagdir="/WEB-INF/tags" %> Example of the path of a tag file : /WEB-INF/tags/test.tag And I use them like so : <t:test oneAttributeKey="oneAttributeValue"> some content... </t:test> My problem : I don't want to put all my tag files in one single folder, "/WEB-INF/tags". I would prefere to have them in different subdirectories : /WEB-INF/tags/users/ /WEB-INF/tags/widgetsA/ /WEB-INF/tags/widgetsB/ (...) Is this possible, without creating a different taglib prefix for each and everyone of them ? Example of what I'd like to avoid :

Constructing Custom Heroku Ruby/Rails Buildpack for Web App Using Taglib-Ruby

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I've built an application using Rails 3.2 that makes use of the taglib-ruby gem. I need to upload this app to Heroku, but it cannot successfully build the taglib-ruby gem because the associated C++ taglib library needs to be installed on the machine. Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb checking for main() in -lstdc++... yes checking for main() in -ltag... no You must have taglib installed in order to use taglib-ruby. Debian/Ubuntu: sudo apt-get install libtag1-dev Fedora/RHEL: sudo yum install taglib-devel Brew: brew

Taglib: Performance and crashes problems

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I'm using the taglib library (1.7.2) in my Qt application, to read some metadatas of mp3 files from a music folder. The problem is that I find it very slow. For example, this is the code: QString path = "C:/Music/"; QDir d(path); QStringList fileTypes; fileTypes << "*.mp3" ; d.setNameFilters(fileTypes); QStringList pathList = d.entryList( QDir::NoDotAndDotDot | QDir::Files); QTime t; t.start(); foreach (QString fileName, pathList) { fileName = path + fileName; TagLib::FileRef *f = new TagLib::FileRef(fileName.toStdWString().c_str()); } qDebug()<<t.elapsed(); This code takes about 11s to load a

Linking error with taglib on Windows

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I built taglib static libraries for Windows as follows. Gotto use mingw, not VS. Check out git clone https://github.com/taglib/taglib.git git_taglib Installed cmake with Win32 installer from cmake.org Configure cmake -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=/C/taglib_package -DCMAKE_C_COMPILER=/C/MinGW4.4/bin/gcc.exe -DCMAKE_CXX_COMPILER=/C/MinGW4.4/bin/g++.exe -DENABLE_STATIC=ON -DENABLE_STATIC_RUNTIME=ON -DHAVE_ZLIB=0 Compile mingw32-make.exe Install mingw32-make.exe install to C:\taglib_package In my Qt project, I am using this library like thus .pro INCLUDEPATH+="C:/taglib_package

Taglib for Android

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问题 I am trying to compile Taglib for Android. I have downloaded the latest version for Taglib from here . After compiling it for arm-linux build I have successfully imported it in my application, but when I try to call any function from tag_c.h I am getting following error: SharedLibrary : taglibwav.so /home/test/workspacenew/Androidtaglibexample/obj/local/armeabi/ objs/squared/taglibwav.o: In function `Java_com_android_androidtag_WavFileDetails_taglibwav': /home/test/workspacenew

How to reference Facelets taglib in JAR from Facelets and web.xml?

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I am using the Apache MyFaces Commons Validator TagLib. How should i add this to my web.xml? The commons JAR is downloaded and resolved through Maven. XHTML (I think this is correct): <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:p="http://primefaces.prime.com.tr/ui" **xmlns:mcv="http://myfaces.apache.org/commons/validators"**> web.xml: <context-param>  <param-name>facelets.LIBRARIES</param-name> <param-value>??.xml</param-value> </context-param> EDIT : The reason why i got to

Get album artwork from ID3 tag/Convert function from Java to Objective-C

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问题 I've got the following question to ask: How do you compile taglib with an iOS application? I'm a bit confused as I added the folder into my project, tried to compile it, but instead it failed with 1640 errors. How do I make it successfully compile - the reason why I ask is taglib allows for the extraction of album artwork from a tag. If anyone knows an Objective-C based album artwork extraction class it would help - I don't know why Apple don't add a way of doing this in Core Foundation -

How do I use TagLib to read/write coverart in different audio formats?

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问题 I would like to use TagLib to read/write coverart especially for mp3 AND ogg files, but I couldn't find any examples. Could someone point me to some examples? Where should I look to find more information about this? 回答1: Here is a version for mp3 and m4a. #include <mpegfile.h> #include <attachedpictureframe.h> #include <id3v2tag.h> #include <mp4file.h> #include <mp4tag.h> #include <mp4coverart.h> #include <iostream> class ImageFile : public TagLib::File { public: ImageFile(const char *file) :