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XBOX Programming..

More than just a toy...


Prt11 - Screenshots! Using Code

Author: Ben Kenwright



As you do more and more coding on the xbox, you find that you build up a number of your own xbox functions, that do lots of little things that you need from time to time.  As I developed this code way way back before using the xdk, as I used to develop simple demos and nest a little function in the main loop so I could capture screenshots when I wanted to the harddrive when pressing certain gamepad keys.  Ahhh those where the days. 


The code is very simple and I think simple code is the best code....it just checks for when the gamepad up is pressed then grabs the front buffer and saves it to a file.  Of course you could modify the code and use it for reflections or capturing the screen for pause menus etc...sure you can think of other things for it ...but its an interesting piece of code.


Here thats exciting code:


Source Code : screenshot.cpp
/*                                                                                                                                                 */
/*  File: screenshot.cpp                                                                                                                 */
/*  URL: www.xbdev.net                                                                                                              */
/*  Email: webmaster@xbdev.net                                                                                                  */
/*  version: 1.0.0                                                                                                                           */
/*                                                                                                                                                 */
  So how does this screensaver functions work?

  It can't be simpler...you include the header file in your code...e.g:
  #include "screenshot.h"

  Then part two, you call it...and it saves a file for you on the hard drive
  a .bmp file...e.g.

  screenshot( g_pD3DDevice, "D:\\Demo.bmp");

  Thats it ;)



#include <xgraphics.h>
#pragma comment(lib, "xgraphics.lib")

// Call this before directX initilisation!...or else it wont work
//***** XInitDevices(0, 0);**********

// JUST MOVE UP!! to take a screenshot and save it to file
bool mygamepad()
//static bool bFirstTime = true;
// XInitDevices(0, 0);

DWORD dwInsertions, dwRemovals;
               XGetDeviceChanges( XDEVICE_TYPE_GAMEPAD, &dwInsertions, &dwRemovals );
static HANDLE pGamePd;

if( dwInsertions & 1 )
                     pGamePd = XInputOpen( XDEVICE_TYPE_GAMEPAD, 0,
                                                              XDEVICE_NO_SLOT, NULL );
if( pGamePd )
                      XINPUT_STATE myInputStates;
                      XInputGetState( pGamePd, &myInputStates );
                      memcpy( &myGamePad, &myInputStates.Gamepad, sizeof(XINPUT_GAMEPAD) );
               if( myGamePad.wButtons & XINPUT_GAMEPAD_DPAD_UP )
                      return true;
return false;
}// End mygamepad(..)

void screenshot( IDirect3DDevice8* pD3DDevice, char* szFileName )
if( szFileName == NULL )
szFileName = "D:\\Demo.bmp";

static float delay = 0.0f;

float nowTime = (float)GetTickCount();

bool bGrab = mygamepad();

// This nowTime variable is so there is a 5 second delay between
// possible image grabs...
if( (nowTime > (delay + 5000)) && bGrab)
delay = nowTime;
IDirect3DSurface8* pSurface;

/********************method -1-*********************************/

XGWriteSurfaceToFile( pSurface, szFileName );


}// End screenshot(...)


Of course if you have the xdk running on your xbox, with the debug bios, you can use one of the xdk librarys that takes a screenshot and copies it to your pc...but this is our own code :)


Happy coding.



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