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creating a link

 
Daniel Layher
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Hi. I'm making a program that will search a network drive for copies of the same file. Once it does that it is supposed to make a copy of those files, delete them, and turn them into shortcuts. Unfortunately, i can't seem to figure out how to create an .lnk file. If anybody has a solution, please, let me know.
 
Bear Bibeault
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Please reserve this forum for advanced Java questions. I've moved this on to the General Computing forum as the format for such files is not Java-specific.
 
Sanjaya Sugiarto
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Perhaps the shortcut command answers your question
 
Daniel Layher
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unfortunately, i'm using java and i'm not sure how to use that in the program. Any suggestions???
 
Henry Wong
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Originally posted by Daniel Layher:
unfortunately, i'm using java and i'm not sure how to use that in the program. Any suggestions???


You can call any OS program from java via the Runtime.exec() series of methods -- just build the command along with any parameters and call it. You can also send the input and read the output from that program.

Henry
 
Henry Wong
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Another option... The "lnk" file is merely a binary file. The format of this file is actually documented (just do a google search for the file format). You can also create the binary file yourself using the standard java io packages.

Henry
 
Daniel Layher
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Originally posted by Henry Wong:


You can call any OS program from java via the Runtime.exec() series of methods -- just build the command along with any parameters and call it. You can also send the input and read the output from that program.

Henry


I mostly understand how to ust the Runtime.exec(), but i'm still not sure how to use it to access shortcut.exe... is there anywhere where there is an example or explanation of how to accomplish this?
 
Henry Wong
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Originally posted by Daniel Layher:


I mostly understand how to ust the Runtime.exec(), but i'm still not sure how to use it to access shortcut.exe... is there anywhere where there is an example or explanation of how to accomplish this?


I don't know about anyone else... but I generally open up a command window. Find the program that I want to run. Run it, to get the right combination of parameters.

And when I figure out the exact calling signature of the program that I want, and make sure it works, I transpose that to a Runtime.exec() call.

Henry
 
Daniel Layher
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in case anybody has the same problem i did, i found code that made shortcuts for me... i seem to only have problems setting the icons, but i can live with it... either way, this is it...

import java.io.*;
import java.util.ArrayList;

public class shortcut extends iconSelect {

private byte answer[];
private int offset;
private byte buf[];
private ByteArrayOutputStream bytestream;
/** Creates a new instance of pscc */
public shortcut() {
}

public void WindowsShortcut(String fulllinkpath, String fulltargetpath, String arguments, String workingdirectory, String iconfile)
throws IOException
{
answer = new byte[1024];
offset = 1024;
buf = new byte[8];
bytestream = new ByteArrayOutputStream(125);
buildLink(fulltargetpath, arguments, workingdirectory, fulllinkpath, setIcon(fulltargetpath));
File linkfile = new File(fulllinkpath);
mkpath(linkfile);
writeFile(linkfile);
}

private final void buildLink(String fulltargetpath, String arguments, String workingdirectory, String fulllinkpath, String iconfile)
throws IOException
{
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
if(iconfile != null)
{
int iconfilelen = write(iconfile);
writeBackward(iconfilelen, 2);
}
if(arguments != null)
{
int argumentslength = write(arguments);
writeBackward(argumentslength, 2);
}
if(workingdirectory != null)
{
int tplength = write(workingdirectory);
writeBackward(tplength, 2);
}
File destf = new File(fulltargetpath);
File linkf = new File(fulllinkpath);
String rp = getRelativePath(linkf.getParent(), destf.getParent());
if(rp != null)
{
if(rp.length() > 0)
{
rp = rp + File.separator + destf.getName();
}
else
{
rp = destf.getName();
}
int rplen = write(rp);
writeBackward(rplen, 2);
}
int postfileoff = offset;
buf[0] = 0;
write(buf, 0, 1);
int finalpathoff = offset;
buf[0] = 0;
write(buf, 0, 1);
write(fulltargetpath);
int localpathoff = offset;
buf[0] = 0;
write(buf, 0, 1);
buf[0] = 16;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
buf[0] = 3;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
int voltablen = (localpathoff - offset) + 4;
writeBackward(voltablen, 4);
int fileinfooff = offset - 28;
int tmp = finalpathoff - fileinfooff;
writeBackward(tmp, 4);
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
tmp = localpathoff - fileinfooff;
writeBackward(tmp, 4);
buf[0] = 28;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
buf[0] = 1;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
buf[0] = 28;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
tmp = postfileoff - fileinfooff;
writeBackward(tmp, 4);
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
write(buf, 0, 8);
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
buf[0] = 1;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
int filelen = (int)destf.length();
writeBackward(filelen, 4);
buf[0] = 0;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
write(buf, 0, 8);
write(buf, 0, 8);
write(buf, 0, 8);
buf[0] = 32;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
int flags = 2;
if(rp != null)
{
flags += 8;
}
if(workingdirectory != null)
{
flags += 16;
}
if(arguments != null)
{
flags += 32;
}
if(iconfile != null)
{
flags += 64;
}
writeBackward(flags, 4);
buf[0] = -64;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 70;
write(buf, 0, 8);
buf[0] = 1;
buf[1] = 20;
buf[2] = 2;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
write(buf, 0, 8);
buf[0] = 76;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
write(buf, 0, 4);
bytestream.close();
}

private final int write(byte source[], int srcoffset, int length)
{
int newoffset = offset - length;
if(newoffset < 0)
{
length += newoffset;
srcoffset -= newoffset;
newoffset = 0;
}
int atbuff = newoffset;
int atsrc = srcoffset;
for(int i = 0; i < length; i++)
{
answer[atbuff] = source[atsrc];
atbuff++;
atsrc++;
}

offset = newoffset;
return length;
}

private final int write(String text)
throws IOException
{
OutputStreamWriter writeout = new OutputStreamWriter(bytestream);
writeout.write(text, 0, text.length());
writeout.close();
byte bytes[] = bytestream.toByteArray();
bytestream.reset();
return write(bytes, 0, bytes.length);
}

private final int write(byte abyte)
{
int rc = 0;
if(offset > 0)
{
offset--;
answer[offset] = abyte;
rc = 1;
}
return rc;
}

private final int writeForward(int value, int length)
{
int i = 0;
int rc = 0;
for(; i < length && i < 4; i++)
{
byte abyte = (byte)value;
rc += write(abyte);
value >>>= 8;
}

return rc;
}

private final int writeBackward(int value, int count)
{
int rc = 0;
byte tmp[] = new byte[count];
int i;
for(i = 0; i < count && i < 4; i++)
{
tmp[i] = (byte)value;
value >>>= 8;
}

return write(tmp, 0, i);
}

private final String getRelativePath(String from, String to)
{
int flen = from.length();
int tlen = to.length();
char sep = File.separatorChar;
int prevsep = -1;
int sepcount = 0;
StringBuffer fromb = new StringBuffer(from);
StringBuffer tob = new StringBuffer(to);
int i = flen - 1;
if(fromb.charAt(i) != sep)
{
fromb.append(sep);
flen++;
}
i = tlen - 1;
if(tob.charAt(i) != sep)
{
tob.append(sep);
tlen++;
}
i = 0;
for(boolean ok = true; ok && i < flen && i < tlen; i++)
{
char achar = Character.toLowerCase(fromb.charAt(i));
if(achar == Character.toLowerCase(tob.charAt(i)))
{
if(achar == sep)
{
prevsep = i;
sepcount++;
}
}
else
{
ok = false;
}
}

if(sepcount == 0)
{
return null;
}
if(i == flen && i == tlen)
{
return "";
}
prevsep++;
fromb.delete(0, prevsep);
tob.delete(0, prevsep);
int state = 0;
for(i = 0; i < fromb.length()
{
char achar = fromb.charAt(i);
if(achar == sep)
{
state = 0;
i++;
}
else
if(state < 2)
{
fromb.setCharAt(i, '.');
state++;
i++;
}
else
{
fromb.deleteCharAt(i);
}
}

i = fromb.length() - 1;
if(i > 0 && fromb.charAt(i) != sep)
{
fromb.append(sep);
}
fromb.append(tob.toString());
flen = fromb.length();
i = flen - 1;
if(fromb.charAt(i) == sep)
{
fromb.delete(i, flen);
}
return fromb.toString();
}

private final void mkpath(File file)
throws IOException
{
ArrayList need = new ArrayList();
File check = file.getParentFile();
int max = 0;
for(; !check.exists(); check = check.getParentFile())
{
max++;
need.add(check);
}

for(int i = 0; i < max; i++)
{
check = (File)need.get(i);
check.mkdir();
need.set(i, null);
}

check = null;
need = null;
}

private final void writeFile(File dest)
throws IOException
{
int len = answer.length - offset;
FileOutputStream ds = new FileOutputStream(dest);
ds.write(answer, offset, len);
ds.close();
}


//public static void main(String args[])
//{
//(String fulllinkpath,String fulltargetpath,String arguments,String workingdirectory,String iconfile)

//try{
//WindowsShortcut a=new WindowsShortcut("c:/a.lnk","c:/sandro/winhelp.exe","","c:/","c:/icon.ico");
//}
//catch(Exception e){}
//}
}
 
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