?
Solved

DeviceCapabilities() buffer

Posted on 2002-06-18
3
Medium Priority
?
411 Views
Last Modified: 2013-11-20
Hi,
I have the following problem.I'm using DeviceCapabilities() to get the paper and tray names a printer supports. However, I can't figure out how to decipher the buffer I get. Could anyone give me a sample code?

Thanks in advance
0
Comment
Question by:ICR
3 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 7089373
Check out http://support.microsoft.com/default.aspx?scid=kb;EN-US;q81245 ("DeviceCapabilities Function Sample Code (Q81245)")
0
 

Author Comment

by:ICR
ID: 7089563
The information here is about how to use the function.I already know that. What I'm asking about, however, is how to use the buffer with the names of the papers/bins I receive - how to separate the names of the papers/bins from the single string I receive.
0
 
LVL 32

Accepted Solution

by:
jhance earned 135 total points
ID: 7089851
It seems pretty straightforward.  The SDK docs say about this:

"Retrieves the names of the printer's paper bins. The pOutput buffer receives an array of string buffers. Each string buffer is 24 characters long and contains the name of a paper bin. The return value indicates the number of entries in the array. The name strings are null-terminated unless the name is 24 characters long. If pOutput is NULL, the return value is the number of bin entries required."

So you have an array of N strings, all NULL terminated and starting 24 characters apart.  The function returns how many there are.

So basically you could do:

char r[25];

DWORD dwCount = DeviceCapabilities(etc...);
if(dwCount != 0xFFFFFFFF){
  p = pBuffer;
  for(DWORD i=0; i<dwCount; i++){
    memset(r, 0, 25);
    memcpy(r, p, 24);
    AfxMessageBox(r, MB_OK);
    p += 24;
  }
}
else{
  // ERROR!!!
}
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Introduction: The undo support, implementing a stack. Continuing from the eigth article about sudoku.   We need a mechanism to keep track of the digits entered so as to implement an undo mechanism.  This should be a ‘Last In First Out’ collec…
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Stellar Phoenix SQL Database Repair software easily fixes the suspect mode issue of SQL Server database. It is a simple process to bring the database from suspect mode to normal mode. Check out the video and fix the SQL database suspect mode problem.
Suggested Courses

599 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