#include "stdafx.h"
#include <windows.h>

LPDEVMODE GetLandscapeDevMode(HWND hWnd, char *pDevice)
{
	HANDLE      hPrinter;
	LPDEVMODE   pDevMode;
	DWORD       dwNeeded, dwRet;

	/* Start by opening the printer */
	if (!OpenPrinter(pDevice, &hPrinter, NULL))
	   return NULL;
	
	/*
	* Step 1:
	* Allocate a buffer of the correct size.
	*/
	dwNeeded = DocumentProperties(hWnd,
	   hPrinter,       /* Handle to our printer. */
	   pDevice,        /* Name of the printer. */
	   NULL,           /* Asking for size, so */
	   NULL,           /* these are not used. */
	   0);             /* Zero returns buffer size. */
	pDevMode = (LPDEVMODE)malloc(dwNeeded);

	/*
	* Step 2:
	* Get the default DevMode for the printer and
	* modify it for your needs.
	*/
	dwRet = DocumentProperties(hWnd,
	   hPrinter,
	   pDevice,
	   pDevMode,       /* The address of the buffer to fill. */
	   NULL,           /* Not using the input buffer. */
	   DM_OUT_BUFFER); /* Have the output buffer filled. */
	if (dwRet != IDOK)
	{
	   /* If failure, cleanup and return failure. */
	   free(pDevMode);
	   ClosePrinter(hPrinter);
	   return NULL;
	}

	/*
	*	Make changes to the DevMode which are supported.
	*/
	if (pDevMode->dmFields & DM_ORIENTATION)
	{
	   /* If the printer supports paper orientation, set it.*/
	   pDevMode->dmOrientation = DMORIENT_LANDSCAPE;
	}
	/*
	* Step 3:
	* Merge the new settings with the old.
	* This gives the driver an opportunity to update any private
	* portions of the DevMode structure.
	*/
	dwRet = DocumentProperties(hWnd,
	   hPrinter,
	   pDevice,
	   pDevMode,       /* Reuse our buffer for output. */
	   pDevMode,       /* Pass the driver our changes. */
	   DM_IN_BUFFER |  /* Commands to Merge our changes and */
	   DM_OUT_BUFFER); /* write the result. */

	/* Finished with the printer */
	ClosePrinter(hPrinter);

	if (dwRet != IDOK)
	{
	   /* If failure, cleanup and return failure. */
	   free(pDevMode);
	   return NULL;
	}

	/* Return the modified DevMode structure. */
	return pDevMode;

}
				
int main(void)
{
	GetLandscapeDevMode(NULL,"Ghostscript PDF");
	return 0;
}