how to use listdlg

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Andy
Andy 2011 年 9 月 30 日
How do i use listdlg? I read the documentation, it said
listdlg('ListString',S), what is ListString and what is S?
i wish to make it so that matlab grabs all the names of the files from a directory and stick them into the listbox. Thanks

回答 (3 件)

Walter Roberson
Walter Roberson 2011 年 9 月 30 日
In the above, 'ListString' is a literal string constant. In the context, it indicates that the value that follows is the value for the ListString parameter. According to the documentation, very top of the table of options, the parameter (S) to be supplied for the 'ListString' option is,
'ListString' Cell array of strings that specify the list box items.
To get information about all of the files in the directory, use
fileinfo = dir('*');
fileinfo([fileinfo.isdir]) = [];
The first line gets the directory information. The second line checks the directory information and then removes all of the entries that have to do with directories (folders), since you said you wanted the names of "the files" and some people do not consider folders to be files themselves (even though they actually are, technically speaking.)
Now that you have that, you can construct the cell array of strings, one filename per cell, by invoking,
S = {fileinfo.name};

Wayne King
Wayne King 2011 年 9 月 30 日
d = dir;
str = {d.name};
[s,v] = listdlg('PromptString','Select a file:',...
'SelectionMode','single',...
'ListString',str)
'ListString',S
is what is called a name-value pair. S is cell array of strings of what is listed in your dialog.
  1 件のコメント
Andy
Andy 2011 年 10 月 3 日
can you give me an example? i did what you did there, but it says
??? Attempt to reference field of non-structure array.
thanks

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Wayne King
Wayne King 2011 年 10 月 3 日
You copied and pasted this into the command window? This should work.
d = dir;
str = {d.name};
[s,v] = listdlg('PromptString','Select a file:',...
'SelectionMode','single',...
'ListString',str)
  3 件のコメント
Walter Roberson
Walter Roberson 2011 年 10 月 3 日
"dir" in Wayne's answer is a call to the dir() function, not the name of a directory.
cd(rootdir);
now follow Wayne's instructions.

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