C++: Deleting a printer queue - c++

Question

I'm trying to remove all the files in queue from a printer. I found this piece of code which seemed pretty straight forward.
I tried deleting the queue with the code below. It compiles, but SetPrinter returns false. The error message I got was 5, which I tried to decode to a "normal" error message using the approach from this question. But I wasn't able to compile with that, because STR_ELEMS is undefined. Searched google for "STR_ELEMS is undefined" but hit a dead end.
Can someone help me decode the error message and delete the printer queue?
BOOL bStatus = false;
HANDLE hPrinter = NULL;
DOC_INFO_1 DocInfo;
bStatus = OpenPrinter((LPTSTR)_T("CN551A"), &hPrinter, NULL);
if(bStatus) {
DWORD dwBufsize=0;
GetPrinterA(hPrinter, 2, NULL, 0, &dwBufsize); // Edit: Returns false
PRINTER_INFO_2* pinfo = (PRINTER_INFO_2*)malloc(dwBufsize);
long result = GetPrinterA(hPrinter, 2,
(LPBYTE)pinfo, dwBufsize, &dwBufsize);
if ( pinfo->cJobs==0 ) // Edit: pinfo->cJobs is not 0
{
printf("No printer jobs found.");
}
else
{
if ( SetPrinter(hPrinter, 0, 0, PRINTER_CONTROL_PURGE)==0 )
printf("SetPrinter call failed: %x\n", GetLastError() );
else printf("Number of printer jobs deleted: %u\n",
pinfo->cJobs);
}
ClosePrinter( hPrinter );
}
My includes are:
#include <windows.h>
#include <winspool.h>

Answer 1

The error code of 5 means "access is denied". (System Error Codes)
Try running with admin privileges.
To format a printable error message from the return value of GetLastError, use FormatMessage something like this:
TCHAR buffer[256];
if (0 == FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0,
GetLastError(), 0, buffer, 256, 0)) {
// FormatMessage failed.
}
Also, you can try passing a PRINTER_DEFAULTS struct to OpenPrinter, maybe like this:
PRINTER_DEFAULTS PrnDefs;
PrnDefs.pDataType = "RAW";
PrnDefs.pDevMode = 0;
PrnDefs.DesiredAccess = PRINTER_ALL_ACCESS;
bStatus = OpenPrinter((LPTSTR)_T("CN551A"), &hPrinter, &PrnDefs);