进程间通信：邮槽

邮槽是基于广播通信体系设计出来的，它彩用无连接的不可靠的数据传输。
邮槽是一种单向通信机制，创建邮槽的服务器进程读取数据，打开邮槽的客户机进程写入数据。

// MailslotSvrView.cpp : implementation of the CMailslotSvrView class
//

#include "stdafx.h"
#include "MailslotSvr.h"

#include "MailslotSvrDoc.h"
#include "MailslotSvrView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMailslotSvrView

IMPLEMENT_DYNCREATE(CMailslotSvrView, CView)

BEGIN_MESSAGE_MAP(CMailslotSvrView, CView)
	//{{AFX_MSG_MAP(CMailslotSvrView)
	ON_COMMAND(IDM_MAILSLOT_RECV, OnMailslotRecv)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMailslotSvrView construction/destruction

CMailslotSvrView::CMailslotSvrView()
{
	// TODO: add construction code here

}

CMailslotSvrView::~CMailslotSvrView()
{
}

BOOL CMailslotSvrView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMailslotSvrView drawing

void CMailslotSvrView::OnDraw(CDC* pDC)
{
	CMailslotSvrDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CMailslotSvrView printing

BOOL CMailslotSvrView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CMailslotSvrView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CMailslotSvrView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CMailslotSvrView diagnostics

#ifdef _DEBUG
void CMailslotSvrView::AssertValid() const
{
	CView::AssertValid();
}

void CMailslotSvrView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CMailslotSvrDoc* CMailslotSvrView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMailslotSvrDoc)));
	return (CMailslotSvrDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMailslotSvrView message handlers

void CMailslotSvrView::OnMailslotRecv() 
{
	// TODO: Add your command handler code here
	HANDLE hMailslot;
	hMailslot = CreateMailslot("\\\\.\\mailslot\\MyMailslot",0,
		MAILSLOT_WAIT_FOREVER,NULL);
	if(INVALID_HANDLE_VALUE == hMailslot)
	{
		MessageBox("创建邮槽失败");
		return;
	}
	char buf[100];
	DWORD dwRead;
	if(!ReadFile(hMailslot,buf,100,&dwRead,NULL))
	{
		MessageBox("读取数据失败");
		CloseHandle(hMailslot);
		return;
	}
	MessageBox(buf);
	CloseHandle(hMailslot);
}

　　

// MailslotClientView.cpp : implementation of the CMailslotClientView class
//

#include "stdafx.h"
#include "MailslotClient.h"

#include "MailslotClientDoc.h"
#include "MailslotClientView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMailslotClientView

IMPLEMENT_DYNCREATE(CMailslotClientView, CView)

BEGIN_MESSAGE_MAP(CMailslotClientView, CView)
	//{{AFX_MSG_MAP(CMailslotClientView)
	ON_COMMAND(IDM_MAILSLOT_SEND, OnMailslotSend)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMailslotClientView construction/destruction

CMailslotClientView::CMailslotClientView()
{
	// TODO: add construction code here

}

CMailslotClientView::~CMailslotClientView()
{
}

BOOL CMailslotClientView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMailslotClientView drawing

void CMailslotClientView::OnDraw(CDC* pDC)
{
	CMailslotClientDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CMailslotClientView printing

BOOL CMailslotClientView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CMailslotClientView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CMailslotClientView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CMailslotClientView diagnostics

#ifdef _DEBUG
void CMailslotClientView::AssertValid() const
{
	CView::AssertValid();
}

void CMailslotClientView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CMailslotClientDoc* CMailslotClientView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMailslotClientDoc)));
	return (CMailslotClientDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMailslotClientView message handlers

void CMailslotClientView::OnMailslotSend() 
{
	HANDLE hMailslot;
	hMailslot = CreateFile("\\\\.\\mailslot\\MyMailslot",GENERIC_WRITE,
		FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
	if(INVALID_HANDLE_VALUE == hMailslot)
	{
		MessageBox("打开邮槽失败");
		return;
	}
	char buf[]="http://www.cn";
	DWORD dwWrite;
	if(!WriteFile(hMailslot,buf,strlen(buf)+1,&dwWrite,NULL))
	{
		MessageBox("写入数据失败");
		CloseHandle(hMailslot);
		return;
	}
	CloseHandle(hMailslot);
}