Printing with Win32 api

     prn_fh = CreateFile("Trouble.prn", GENERIC_WRITE, FILE_SHARE_WRITE, NULL ,
            OPEN_ALWAYS  , FILE_ATTRIBUTE_SYSTEM, NULL);
      CloseHandle(prn_fh);
    // Fill in the structure with info about this "document"
     DocInfo.pDocName = "Trouble.prn";
     DocInfo.pOutputFile = NULL;
     DocInfo.pDatatype = "RAW";
     // Inform the spooler the document is beginning
     if( (job = StartDocPrinter( hpr, 1, (unsigned char*)&DocInfo )) == 0 )
     {
             stat = GetLastError ();
// stat == 32 sharing violation. What am I doing wrong???
Ps OpenPrinter ( in prevous section) doesn't return an error!
rabitAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

gaohongCommented:
I think you use conflicting attributes in CreateFile() call.
prn_fh = CreateFile("Trouble.prn", GENERIC_WRITE,
                 0, /*  FILE_SHARE_WRITE, */  NULL ,
 OPEN_ALWAYS , /* FILE_ATTRIBUTE_SYSTEM, */ FILE_ATTRIBUTE_NORMAL, NULL);

stat = GetLastError ();   //call GetLastError here
//here check your returned handle
 
If the function succeeds, the return value is an open handle of the specified file. If the specified file exists before the function call and dwCreationDistribution is CREATE_ALWAYS or OPEN_ALWAYS, a call to GetLastError returns ERROR_ALREADY_EXISTS (even though the function has succeeded). If the file does not exist before the call, GetLastError returns zero.
If the function fails, the return value is INVALID_HANDLE_VALUE.

CloseHandle(prn_fh);    //after GetLastError()

Check out help page to make sure arguments are what you wanted

good luck
gaohong
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
rabitAuthor Commented:
I am creating the file ok! was able to write to file in preporation to printing it! changed from FILE_ATTRIBUTE_NORMAL to FILE_ATTRIBUTE_SYSTEM in desperation (I will however try your suggestion). Notice I closed the ^%#$ thing before geting a sharing violation. stepping thru the debugger shows a valid file handle, my problem is the printing of
a file or writing to the printer. Somehow, I've got to get a list of( database) errors to a network printer! P.S. NT 4.0 server
MSVC 4?

0
rabitAuthor Commented:
Thanks!!!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C++

From novice to tech pro — start learning today.