?? videomemory.c
字號:
/**********************************************************************
*
* Toby Opferman
*
* Shared Video Memory
*
* This example is for educational purposes only. I license this source
* out for use in learning how to write a device driver.
*
* Copyright (c) 2005, All Rights Reserved
**********************************************************************/
#include <windows.h>
#include <stdio.h>
#include "videomemory.h"
/*********************************************************************
* Internal Prototypes
*********************************************************************/
/*********************************************************************
* VideoMemory_GetSharedMemory
*
* This function is used to get shared video memory.
*
*********************************************************************/
PCHAR VideoMemory_GetSharedMemory(void)
{
PCHAR pVideoMemory;
HANDLE hMapFile, hFile;
hFile = CreateFile("c:\\video.dat", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
if(hFile && hFile != INVALID_HANDLE_VALUE)
{
hMapFile = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
if(hMapFile && hMapFile != INVALID_HANDLE_VALUE)
{
pVideoMemory = MapViewOfFile(hMapFile, FILE_MAP_READ, 0, 0, 0);
CloseHandle(hMapFile);
}
CloseHandle(hFile);
}
return pVideoMemory;
}
/*********************************************************************
* VideoMemory_ReleaseSharedMemory
*
* This function is used to Release shared video memory.
*
*********************************************************************/
void VideoMemory_ReleaseSharedMemory(PCHAR pVideoMemory)
{
UnmapViewOfFile(pVideoMemory);
}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -