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前言：因为来实现Freescale环境在Arduino IDE的实现，需要对源代码的进行分析。在使用IDE的使用过程中，我们发现如果直接在Editor中include库的话，编译器将无视，所以必须点击工具栏的Sketch->Import Library才能成功include所需要的库。
分析：IDE的源代码在arduino-1.0.X/app/src/processing/app中。很容易找到关于Sketch的.java文件。 寻找到引入库的函数importLibrary,如下: public void importLibrary(String jarPath) { // make sure the user didn't hide the sketch folder ensureExistence();
String list[] = Compiler.headerListFromIncludePath(jarPath);
// import statements into the main sketch file (code[0]) // if the current code is a .java file, insert into current //if (current.flavor == PDE) { if (hasDefaultExtension(current)) { setCurrentCode(0); } // could also scan the text in the file to see if each import // statement is already in there, but if the user has the import // commented out, then this will be a problem. StringBuffer buffer = new StringBuffer(); for (int i = 0; i < list.length; i++) { buffer.append("#include <"); buffer.append(list[i]); buffer.append(">\n"); } buffer.append('\n'); buffer.append(editor.getText()); editor.setText(buffer.toString()); editor.setSelection(0, 0); // scroll to start setModified(true); }
可见ide将库的路径添加到Compiler.headerListFromIncludePath中，然后在Editor中写入"#include ". 然后找到Compiler文件（位于arduino-1.0.X/app/src/processing/app/debug）Compiler.java中headerListFromIncludePath()函数，如下：
static public String[] headerListFromIncludePath(String path) { FilenameFilter onlyHFiles = new FilenameFilter() { public boolean accept(File dir, String name) { return name.endsWith(".h"); } }; return (new File(path)).list(onlyHFiles); }
static public ArrayList findFilesInPath(String path, String extension, boolean recurse) { return findFilesInFolder(new File(path), extension, recurse); } static public ArrayList findFilesInFolder(File folder, String extension, boolean recurse) { ArrayList files = new ArrayList(); if (folder.listFiles() == null) return files; for (File file : folder.listFiles()) { if (file.getName().startsWith(".")) continue; // skip hidden files if (file.getName().endsWith("." + extension)) files.add(file); if (recurse && file.isDirectory()) { files.addAll(findFilesInFolder(file, extension, true)); } } return files; } } 以下函数选择板子： String avrBasePath = Base.getAvrBasePath(); Map boardPreferences = Base.getBoardPreferences(); String core = boardPreferences.get("build.core"); if (core == null) { RunnerException re = new RunnerException(_("No board selected; please choose a board from the Tools > Board menu.")); re.hideStackTrace(); throw re; } String corePath; 最后编译选配置为“-I”：
for (int i = 0; i < includePaths.size(); i++) { baseCommandCompiler.add("-I" + (String) includePaths.get(i)); }