無法找到org.eclipse.swt.widgets.XXX的類文件

Question

我正在使用Eclipse Indigo，並且無法編譯一些在Ganymede中以前工作正常的代碼。我無法導入以下任何類別：

import org.eclipse.swt.SWT; 
import org.eclipse.swt.custom.CTabFolder; 
import org.eclipse.swt.custom.CTabItem; 
import org.eclipse.swt.layout.GridData; 
import org.eclipse.swt.layout.GridLayout; 
import org.eclipse.swt.widgets.Composite; 

我試圖在Eclipse Marketplace中搜索SWT，但找不到該庫。另外，我閱讀了其他文章，說重建我的項目（我做了），其他人建議下載「JAR」。有誰知道我需要下載哪個JAR？或者如何修復我的構建路徑，以便它包含這些SWT庫？

類路徑（DannyGui應該有兩次）：提前

<?xml version="1.0" encoding="UTF-8"?> 
<classpath> 
<classpathentry kind="src" path="com.danny.DannyGui.plugin/src"/> 
<classpathentry exported="true" kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/swtgraphics2d.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/stringtemplate-3.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/antlr-2.7.7.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/antlr-3.1.3.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/antlr-runtime-3.1.3.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/gunit.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/wrapper-3.1.0.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/antlr-2.7.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/avalon-framework-4.1.5.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/backport-util-concurrent.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/idl.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/jacorb.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/logkit-1.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/picocontainer-1.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/gnujaxp.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/iText-2.1.3.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jcommon-1.0.15.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jfreechart-1.0.12.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jfreechart-1.0.12-experimental.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jfreechart-1.0.12-swt.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/junit.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/servlet.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/log4j/log4j-1.2.15.jar"/> 
<classpathentry kind="output" path="bin"/> 
</classpath> 

感謝。

Answer 1

發佈的.classpath文件不包含任何可以加載SWT類的地方。這個項目不會像任何版本的Eclipse一樣構建。

這聽起來像你正試圖構建爲獨立的SWT應用程序（而不是說一個Eclipse插件）。獨立應用程序需要類路徑上的SWT庫。您不會在Eclipse Marketplace上查找SWT，因爲您並未在尋找擴展Eclipse的插件。您正在尋找您的項目所依賴的圖書館。您將SWT作爲一個zip文件下載，您可以從系統中抽取某個地方。該zip包含.jar文件和作爲SWT實現一部分的本機庫。

與其給你一個直接的鏈接，我會告訴你如何找到它。開始在Eclipse平臺下載網站：

http://download.eclipse.org/eclipse/downloads/

忽略發展的基礎之上。查看最新版本。現在，這將是3.7。跟隨該鏈接到構建頁面。尋找SWT底部。下載適合您系統的zip文件。解壓縮並從項目的類路徑中添加對包含的jar的引用。

Answer 2

3.7最新的SWT：http://download.eclipse.org/eclipse/downloads/drops/R-3.7-201106131736/index.php#SWT