问题
I have a library contains a bunch of static *lib files, I wish to access them from JNA (a Java library that allows one to dynamically call `dll's from JAVA Code), so is there a way to magically change static lib to dll?
Code was compiled using Visual studio (hope that is relevant), and I also have appropriate header files.
I do not have access to source code, also I would like to do it using only free (as in beer) tools.
回答1:
I'm not aware of anyb tools that will do this automatically, but the process is to create a DLL project and add your libraries to the project. For each function in the header file:
int SomeLibFunc( int x, int y );
you would need to create and export your own function in the DLL;
int MyFunc( int x, int y ) {
return SomLibFunc( x, y );
}
The process is quite mechanical, and you may be able to knock up a script using something like perl to create the DLL source files.
回答2:
Assuming you don't have access to the source, you can simply create a wrapper DLL that exports the functions you need and delegates to the static library.
回答3:
I did as anon suggested, I did an automatic converter (someone suggested just putting _ddlspec(export) before declaration and compiling dll with this header would work -- well it didn't -- maybe i did something wrong -- I'm Plain Old Java Programmer ;)):
it basically parses header files and turns:
SADENTRY SadLoadedMidFiles( HMEM, USHORT usMaxMidFiles, VOID * );
to:
__declspec(dllexport) SADENTRY DLL_WRAPPER_SadLoadedMidFiles(HMEM param0,
USHORT usMaxMidFiles, VOID* param2){
return SadLoadedMidFiles(param0, usMaxMidFiles, param2);
}
Here is the code (most probably its Regexp abuse, but it works), gui part depends on MigLayout:
package cx.ath.jbzdak.diesIrae.util.wrappergen;
import net.miginfocom.swing.MigLayout;
import javax.swing.*;
import static java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Displays a window. In this window you have to specify two things:
* <p/>
* 1. Name of header file that you want to process.
* <p/>
* 2. Name of output files extension will be added automatically. We will override any existing files.
*
* <p/>
* Dependencies: MigLayout
* <p/>
* Actual wrapper generation is done inside WrapperGen class.
* <p/>
* KNOWN ISSUES:
* <p/>
* 1. Ignores preprocessor so may extract finction names that are inside <code>#if false</code>.
* <p/>
* 2. Ignores comments
* <p/>
* 3. May fail to parse werid parameter syntax. . .
*
* Created by IntelliJ IDEA.
* User: Jacek Bzdak
*/
public class WrapperGenerator {
public static final Charset charset = Charset.forName("UTF-8");
WrapperGen generator = new WrapperGen();
// GUI CODE:
File origHeader, targetHeader, targetCpp;
JTextField newHeaderFileName;
JFrame wrapperGeneratorFrame;
{
wrapperGeneratorFrame = new JFrame();
wrapperGeneratorFrame.setTitle("Zamknij mnie!"); //Wrapper generator
wrapperGeneratorFrame.setLayout( new MigLayout("wrap 2, fillx", "[fill,min!]"));
wrapperGeneratorFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ActionListener buttonListener = new ActionListener() {
JFileChooser fileChooser = new JFileChooser();
{
fileChooser.setFileFilter(new javax.swing.filechooser.FileFilter() {
@Override
public boolean accept(File f) {
return f.isDirectory() || f.getName().matches(".*\\.h(?:pp)?");
}
@Override
public String getDescription() {
return "Header files";
}
});
fileChooser.setCurrentDirectory(new File("C:\\Documents and Settings\\jb\\My Documents\\Visual Studio 2008\\Projects\\dll\\dll"));
}
public void actionPerformed(ActionEvent e) {
if(JFileChooser.APPROVE_OPTION == fileChooser.showOpenDialog(wrapperGeneratorFrame)){
origHeader = fileChooser.getSelectedFile();
}
}
};
wrapperGeneratorFrame.add(new JLabel("Original header file"));
JButton jButton = new JButton("Select header file");
jButton.addActionListener(buttonListener);
wrapperGeneratorFrame.add(jButton);
wrapperGeneratorFrame.add(new JLabel("Result files prefix"));
newHeaderFileName = new JTextField("dll_wrapper");
wrapperGeneratorFrame.add(newHeaderFileName);
ActionListener doListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
targetHeader = new File(origHeader.getParentFile(), newHeaderFileName.getText() + ".h");
targetCpp = new File(origHeader.getParentFile(), newHeaderFileName.getText() + ".cpp");
try {
targetHeader.createNewFile();
targetCpp.createNewFile();
generator.reader = new InputStreamReader(new FileInputStream(origHeader),charset);
generator.cppWriter = new OutputStreamWriter(new FileOutputStream(targetCpp), charset);
generator.heaerWriter = new OutputStreamWriter(new FileOutputStream(targetHeader), charset);
generator.parseReader();
} catch (IOException e1) {
e1.printStackTrace();
JOptionPane.showMessageDialog(wrapperGeneratorFrame, "ERROR:" + e1.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
return;
}
}
};
JButton go = new JButton("go");
go.addActionListener(doListener);
wrapperGeneratorFrame.add(go, "skip 1");
}
public static void main(String []args){
SwingUtilities.invokeLater(new Runnable() {
public void run() {
WrapperGenerator wgen = new WrapperGenerator();
JFrame f = wgen.wrapperGeneratorFrame;
wgen.wrapperGeneratorFrame.pack();
Point p = getLocalGraphicsEnvironment().getCenterPoint();
wgen.wrapperGeneratorFrame.setLocation(p.x-f.getWidth()/2, p.y-f.getHeight()/2);
wgen.wrapperGeneratorFrame.setVisible(true);
}
});
}
}
/**
* Does the code parsing and generation
*/
class WrapperGen{
/**
* Method is basically syntax like this: <code>(anything apart from some special chars like #;) functionName(anything)</code>;
* Method declarations may span many lines.
*/
private static final Pattern METHOD_PATTERN =
//1 //2 //params
Pattern.compile("([^#;{}]*\\s+\\w[\\w0-9_]+)\\(([^\\)]*)\\);", Pattern.MULTILINE);
//1 - specifiers - including stuff like __dllspec(export)...
//2 - function name
//3 param list
/**
* Generated functions will have name prefixet with #RESULT_PREFIX
*/
private static final String RESULT_PREFIX = "DLL_WRAPPER_";
/**
* Specifiers of result will be prefixed with #RESULT_SPECIFIER
*/
private static final String RESULT_SPECIFIER = "__declspec(dllexport) ";
Reader reader;
Writer heaerWriter;
Writer cppWriter;
public void parseReader() throws IOException {
StringWriter writer = new StringWriter();
int read;
while((read = reader.read())!=-1){
writer.write(read);
}
reader.close();
heaerWriter.append("#pragma once\n\n\n");
heaerWriter.append("#include \"stdafx.h\"\n\n\n"); //Standard Visual C++ import file.
cppWriter.append("#include \"stdafx.h\"\n\n\n");
Matcher m = METHOD_PATTERN.matcher(writer.getBuffer());
while(m.find()){
System.out.println(m.group());
handleMatch(m);
}
cppWriter.close();
heaerWriter.close();
}
public void handleMatch(Matcher m) throws IOException {
Method meth = new Method(m);
outputHeader(meth);
outputCPP(meth);
}
private void outputDeclaration(Method m, Writer writer) throws IOException {
//writer.append(RESULT_SPECIFIER);
writer.append(m.specifiers);
writer.append(" ");
writer.append(RESULT_PREFIX);
writer.append(m.name);
writer.append("(");
for (int ii = 0; ii < m.params.size(); ii++) {
Parameter p = m.params.get(ii);
writer.append(p.specifiers);
writer.append(" ");
writer.append(p.name);
if(ii!=m.params.size()-1){
writer.append(", ");
}
}
writer.append(")");
}
public void outputHeader(Method m) throws IOException {
outputDeclaration(m, heaerWriter);
heaerWriter.append(";\n\n");
}
public void outputCPP(Method m) throws IOException {
cppWriter.append(RESULT_SPECIFIER);
outputDeclaration(m, cppWriter);
cppWriter.append("{\n\t");
if (!m.specifiers.contains("void") || m.specifiers.matches(".*void\\s*\\*.*")) {
cppWriter.append("return ");
}
cppWriter.append(m.name);
cppWriter.append("(");
for (int ii = 0; ii < m.params.size(); ii++) {
Parameter p = m.params.get(ii);
cppWriter.append(p.name);
if(ii!=m.params.size()-1){
cppWriter.append(", ");
}
}
cppWriter.append(");\n");
cppWriter.append("}\n\n");
}
}
class Method{
private static final Pattern NAME_REGEXP =
//1 //2
Pattern.compile("\\s*(.*)\\s+(\\w[\\w0-9]+)\\s*", Pattern.MULTILINE);
//1 - all specifiers - including __declspec(dllexport) and such ;)
//2 - function name
public final List<Parameter> params;
public final String name;
public final String specifiers;
public Method(Matcher m) {
params = Collections.unmodifiableList(Parameter.parseParamList(m.group(2)));
Matcher nameMather = NAME_REGEXP.matcher(m.group(1));
System.out.println("ALL: " + m.group());
System.out.println("G1: " + m.group(1));
if(!nameMather.matches()){
throw new IllegalArgumentException("for string " + m.group(1));
}
// nameMather.find();
specifiers = nameMather.group(1);
name = nameMather.group(2);
}
}
class Parameter{
static final Pattern PARAMETER_PATTERN =
//1 //2
Pattern.compile("\\s*(?:(.*)\\s+)?([\\w\\*&]+[\\w0-9]*[\\*&]?)\\s*");
//1 - Most probably parameter type and specifiers, but may also be empty - in which case name is empty, and specifiers are in 2
//2 - Most probably parameter type, sometimes prefixed with ** or &* ;), also
// 'char *' will be parsed as grup(1) == char, group(2) = *.
/**
* Used to check if group that represenrs parameter name is in fact param specifier like '*'.
*/
static final Pattern STAR_PATTERN =
Pattern.compile("\\s*([\\*&]?)+\\s*");
/**
* If
*/
static final Pattern NAME_PATTERN =
Pattern.compile("\\s*([\\*&]+)?(\\w[\\w0-9]*)\\s*");
public final String name;
public final String specifiers;
public Parameter(String param, int idx) {
System.out.println(param);
Matcher m = PARAMETER_PATTERN.matcher(param);
String name = null;
String specifiers = null;
if(!m.matches()){
throw new IllegalStateException(param);
}
name = m.group(2);
specifiers = m.group(1);
if(specifiers==null || specifiers.isEmpty()){ //Case that parameter has no name like 'int', or 'int**'
specifiers = name;
name = null;
}else if(STAR_PATTERN.matcher(name).matches()){ //Case that parameter has no name like 'int *'
specifiers += name;
name = null;
}else if(NAME_PATTERN.matcher(name).matches()){ //Checks if name contains part of type like '**ptrData', and extracts '**'
Matcher m2 = NAME_PATTERN.matcher(name);
m2.matches();
if(m2.group(1)!=null){
specifiers += m2.group(1);
name = m2.group(2);
}
}
if(name==null){
name = "param" + idx;
}
this.specifiers = specifiers;
this.name = name;
}
public static List<Parameter> parseParamList(String paramList){
List<Parameter> result = new ArrayList<Parameter>();
String[] params = paramList.split(",");
int idx = 0;
for(String param : params){
Parameter p = new Parameter(param, idx++);
result.add(p);
}
if(result.size()==1){
Parameter p = result.get(0);
if(p.specifiers.matches("\\s*void\\s*")){
return Collections.emptyList();
}
}
return result;
}
}
来源：https://stackoverflow.com/questions/845183/convert-static-windows-library-to-dll