Solved

pointer to pointer

Posted on 2009-03-30
5
294 Views
Last Modified: 2012-05-06
Hello
I'm trying to use a NI library function that is decleard as below.
CWUIControlsLib_CWAxisGetFormatString (CAObjHandle objectHandle,
                                                       ERRORINFO *errorInfo,
                                                       char **returnValue);
The purpose is to read out a format string in "returnValue".
If I declear a pointer to pointer to char as char **Pointer, the compiler (CVI 8.5) complains
that the pointer is not initialized and I do not get the sting I'm looking for.
Anyone have a proposal ?
Regards Per
0
Comment
Question by:fluidtronic
  • 2
  • 2
5 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 24018065
can you initialize the pointer?
if it is a pointer in which to return a value, you may want to point it to the place where you want the value returned.
0
 
LVL 6

Accepted Solution

by:
twocandles earned 50 total points
ID: 24018093
try to declare it as this:

char *returnValue[MAX_VALUE];

thus initializing it.
0
 

Author Comment

by:fluidtronic
ID: 24018110
Hi
I have tried this but with the same result.

char **Specifier,FormatString[80];
*Specifier=FormatString;       
CWUIControlsLib_CWAxisGetFormatString(Axis[0],NULL,Specifier);
0
 

Author Closing Comment

by:fluidtronic
ID: 31564293
That works. Thank you.
0
 
LVL 6

Expert Comment

by:twocandles
ID: 24018477
You're welcome. Thanks for the points!
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
splitOdd10 challenge 5 106
index Out OF Range Exception error 4 61
Math Equation 23 86
Query Syntax 17 34
Displaying an arrayList in a listView using the default adapter is rarely the best solution. To get full control of your display data, and to be able to refresh it after editing, requires the use of a custom adapter.
Entering a date in Microsoft Access can be tricky. A typo can cause month and day to be shuffled, entering the day only causes an error, as does entering, say, day 31 in June. This article shows how an inputmask supported by code can help the user a…
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question