I want to print 2 panels, one portrait, one landcape. Is it possible to comfirm one, print to the same printer ? PrintPanel doesn't return the printer used.

You can enumerate printers in the system by using some Win32API calls this way (here I am filling a listbox with printer names on a button callback): int CVICALLBACK EnumeratePrinters (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { int error = 0; int i, numPrt, needed; PRINTER_INFO_1 *pi = NULL; char *z = NULL; if (event != EVENT_COMMIT) return 0; //BOOL EnumPrinters( // DWORD Flags, // printer object types // LPTSTR Name, // name of printer object // DWORD Level, // information level // LPBYTE pPrinterEnum, // printer information buffer // DWORD cbBuf, // size of printer information buffer // LPDWORD pcbNeeded, // bytes received or required // LPDWORD pcReturned // number of printers enumerated //); // Get required memory size EnumPrinters ( PRINTER_ENUM_LOCAL, // enumerate local printers NULL, // name of printer object 1, // general printer info NULL, // printer information buffer 0, // size of printer information buffer &needed, // bytes required NULL // number of printers enumerated ); // Allocate memory z = malloc (needed); memset (z, 0, needed); // Enumerate printers if (!EnumPrinters ( PRINTER_ENUM_LOCAL, // enumerate local printers NULL, // name of printer object 1, // general printer info z, // printer information buffer needed, // size of printer information buffer &needed, // bytes required &numPrt // number of printers enumerated )) { MessagePopup ("Error", "Error in EnumPrinters."); error = GetLastError (); goto Error; } // Allocate structured memory pi = calloc (numPrt, sizeof (PRINTER_INFO_1)); memcpy (pi, z, numPrt * sizeof (PRINTER_INFO_1)); for (i = 0; i < numPrt; i++) { InsertListItem (panel, PANEL_LISTBOX, -1, pi[i].pName, i); } SetInputMode (panel, PANEL_PRINT, 1); Error: if (z) free (z); if (pi) free (pi); return 0; } The list of printers can be shown in a "options" panel where the user can select the printer to be used, next you can print with that printer this way: int CVICALLBACK PrintSome (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { int idx; char name[64]; if (event != EVENT_COMMIT) return 0; GetCtrlIndex (panel, PANEL_LISTBOX, &idx); GetLabelFromIndex (panel, PANEL_LISTBOX, idx, name); SetPrintAttribute (ATTR_PRINTER_NAME, name); // Specify which printer to use SetPrintAttribute (ATTR_PRINT_AREA_WIDTH, VAL_INTEGRAL_SCALE); SetPrintAttribute (ATTR_PRINT_AREA_HEIGHT, VAL_USE_ENTIRE_PAPER); PrintPanel (panel, "", 1, VAL_FULL_PANEL, 1); return 0; } Nevertheless, this is somewhat not intuitive and you need to dig and study some of Win32APIs to obtain it. You may want to support this CVI idea for an independent command that displays the print dialog.

LabWindows/CVI

Print 2 panels with one comfirm?

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Thanks for reply.

Already tried that function.

It causes GPF/fatal runtime error.

George Zou

Message 11 of 12

(910 Views)

Author

EnumPrinters worked for over a month now.

Don't know why it stops working.

needed returns 0.

GetLastError() returns 1780: A null reference pointer was passed to the stub.

The problem is pcReturned. Instead of using NULL, use a variable solved the problem.

Don't know why it worked in the first place.

George Zou

Message 12 of 12

(873 Views)

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LabWindows/CVI

Print 2 panels with one comfirm?

Re: Print 2 panels with one comfirm?

Re: Print 2 panels with one comfirm?