filesample.c

有关文件操作的源码

/*===========================================================================

FILE: FileSample.c
===========================================================================*/


/*===============================================================================
INCLUDES AND VARIABLE DEFINITIONS
=============================================================================== */
#include "AEEModGen.h"          // Module interface definitions
#include "AEEAppGen.h"          // Applet interface definitions
#include "AEEShell.h"           // Shell interface definitions
#include "AEEFile.h"			// File interface definitions

#include "filesample.bid"

/*-------------------------------------------------------------------
Function Prototypes
-------------------------------------------------------------------*/
static boolean FileSample_HandleEvent(IApplet * pi, AEEEvent eCode, 
                                      uint16 wParam, uint32 dwParam);

/*===============================================================================
FUNCTION DEFINITIONS
=============================================================================== */
static boolean FileSample_TestFun(IShell *pIShell, uint32 score);


int AEEClsCreateInstance(AEECLSID ClsId,IShell * pIShell,IModule * po,void ** ppObj)
{
   *ppObj = NULL;
		
   if(ClsId == AEECLSID_FILESAMPLE){
      if(AEEApplet_New(sizeof(AEEApplet), ClsId, pIShell,po,(IApplet**)ppObj,
         (AEEHANDLER)FileSample_HandleEvent,NULL)
         == TRUE)
      {
		 // Add your code here .....

         return (AEE_SUCCESS);
      }
   }
	return (EFAILED);
}


static boolean FileSample_HandleEvent(IApplet * pi, AEEEvent eCode, uint16 wParam, uint32 dwParam)
{  
	AECHAR hints1[18] = {'P','r','e','s','s',' ','S','E','L',' ','t','o',' ','t','e','s','t','!'};
	AECHAR hints2[13] = {'T','e','s','t',' ','S','u','c','c','e','s','s','!'};
	AECHAR hints3[12] = {'T','e','s','t',' ','F','a','i','l','e','d','!'};

	AEEApplet *pAEEApplet = (AEEApplet *)pi;
	IDisplay *pIDisplay = pAEEApplet->m_pIDisplay;
	IShell	 *pIShell   = pAEEApplet->m_pIShell;

	switch (eCode) 
	{
      case EVT_APP_START:    
			IDISPLAY_ClearScreen(pIDisplay);
			IDISPLAY_DrawText(pIDisplay, AEE_FONT_NORMAL, hints1,
				18, 0, 50, NULL, IDF_ALIGN_CENTER);
			IDISPLAY_Update(pIDisplay);
		    // Add your code here .....

      		return(TRUE);
      case EVT_APP_STOP:

		    // Add your code here .....

         return TRUE;
	  case EVT_KEY:
		  switch(wParam)
		  {
		  case AVK_SELECT:
			  if(FileSample_TestFun(pIShell, 10) == SUCCESS){
				IDISPLAY_ClearScreen(pIDisplay);
				IDISPLAY_DrawText(pIDisplay, AEE_FONT_NORMAL, hints2,
					13, 0, 50, NULL, IDF_ALIGN_CENTER);
				IDISPLAY_Update(pIDisplay);
			  }
			  else{
				IDISPLAY_ClearScreen(pIDisplay);
				IDISPLAY_DrawText(pIDisplay, AEE_FONT_NORMAL, hints3,
					12, 0, 50, NULL, IDF_ALIGN_CENTER);
				IDISPLAY_Update(pIDisplay);
			  }
			  return TRUE;
		  default:
			  break;
		  }
      default:
         break;
   }
   return FALSE;
}

/************************************************************************
/* 函数功能：记录游戏的高分信息
/*
/* 参数：
/*		pIShell － IShell接口指针
/*		score   － 本次游戏的得分
/*
/* 返回值：
/*		SUCCESS － 执行成功
/*		EFAILED -  执行失败                                                                 
************************************************************************/
static boolean FileSample_TestFun(IShell *pIShell, uint32 score)
{
	//龙虎榜文件的文件名
	const char *pszfile = "record.dat";	

	//存储龙虎榜文件中记录的最高分
	uint32 oldscore = 0;				

	//IFileMgr接口指针，用于生成IFileMgr接口实例
	IFileMgr *pIFileMgr = NULL;			

	//IFile接口指针，用于生成IFile接口实例
	IFile    *pIFile    = NULL;			

	//创建IFileMgr接口实例
	if(ISHELL_CreateInstance(pIShell, AEECLSID_FILEMGR, (void **)&pIFileMgr) != SUCCESS){
		return EFAILED;
	}
	
	//判断龙虎榜文件是否存在
	if(IFILEMGR_Test(pIFileMgr, pszfile) == SUCCESS){ //龙虎榜文件存在
		//以读写方式打开龙虎榜文件，返回IFile接口实例
		if((pIFile = IFILEMGR_OpenFile(pIFileMgr, pszfile, _OFM_READWRITE)) == NULL){
			return EFAILED;
		}

		//读取龙虎榜文件中记录的最高分信息
		IFILE_Read(pIFile, &oldscore, sizeof(uint32));

		//判断本次游戏的得分是否超过龙虎榜记录
		if(score > oldscore){ //超过
			//重新定位文件指针到文件头
			IFILE_Seek(pIFile, _SEEK_START, 0);
			//覆盖原有记录
			IFILE_Write(pIFile, &score, sizeof(uint32));
		}
	}
	else{ //龙虎榜文件不存在
		//创建龙虎榜文件，返回IFile接口实例
		if((pIFile = IFILEMGR_OpenFile(pIFileMgr, pszfile, _OFM_CREATE)) == NULL){
			return EFAILED;
		}

		//写入高分记录
		IFILE_Write(pIFile, &score, sizeof(uint32));
	}
	
	//关闭文件
	IFILE_Release(pIFile);
	
	//释放IFileMgr接口实例
	IFILEMGR_Release(pIFileMgr);

	return SUCCESS;
}