进程间命名管道通信示例

     服务端新建管道，等待客户端连接；客户端连接后，服务端向管道写入"I am the true server"的身份信息，客户端从管道读取此信息，来确认已连上目标管道；

     然后客户端向管道写入文件名，服务端从管道读取文件名后，打开文件，将读出的内容通过管道传递给客户端，最后由客户端显示。

 

 

服务端：

/*by: Peter_ZHAat: Oct 3rd, 2009*//*命名管道通信实验，运行前确保d:/textfile.txt存在*/#include <Windows.h>#include "resource.h"//===================函数声明=====================DWORD WINAPI ThreadProc(LPVOID lParam);BOOL CALLBACK MainDlg(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);//===================全局数据======================#ifdef UNICODE#define CHARLEN 2#else#define CHARLEN 1#endif // UNICODE#define BUFFERSIZE 512TCHAR *szPipeName = TEXT("////.//pipe//testPipe");TCHAR *szPipeIdentity = TEXT("I am the true server");HWND hWinMain;TCHAR szBuffer[BUFFERSIZE];CHAR szText[BUFFERSIZE];TCHAR szFileName[MAX_PATH + 3];//===================主函数====================INT_PTR WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){DialogBoxParam(hInstance, MAKEINTRESOURCE(IDD_MAINDLG), NULL, MainDlg, NULL);return 0;}//====================对话框函数=========================BOOL CALLBACK MainDlg(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){static DWORD dwThreadID;switch(message){case WM_INITDIALOG:hWinMain = hDlg;CreateThread(NULL, 0, ThreadProc, NULL, NULL, &dwThreadID);return TRUE;case WM_COMMAND:switch(LOWORD(wParam)){case IDC_CLOSE:SendMessage(hDlg, WM_CLOSE, NULL, NULL);break;}return TRUE;case WM_CLOSE:EndDialog(hDlg, TRUE);return TRUE;}return FALSE;}//================线程函数=========================// 实现创建管道，连接，显示状态等功能DWORD WINAPI ThreadProc(LPVOID lParam){static DWORD dwNumberOfByteWritten;static DWORD dwNumberOfByteRead;//----------------------创建管道-------------------------------HANDLE hNamedPipe = CreateNamedPipe(szPipeName, PIPE_ACCESS_DUPLEX|FILE_FLAG_WRITE_THROUGH, PIPE_TYPE_MESSAGE|PIPE_WAIT, PIPE_UNLIMITED_INSTANCES, BUFFERSIZE,BUFFERSIZE, NMPWAIT_USE_DEFAULT_WAIT, NULL);if(hNamedPipe == INVALID_HANDLE_VALUE){MessageBox(hWinMain, TEXT("命名管道创建失败"), NULL, MB_OK);return 1;}//-----------------------连接管道-------------------------------if(ConnectNamedPipe(hNamedPipe, NULL)){SetDlgItemText(hWinMain, IDC_STATE, TEXT("已连接"));}else{SetDlgItemText(hWinMain, IDC_STATE, TEXT("连接失败,请关闭重试"));return 1;}//-----------------------使用管道----------------------------------//写入服务器身份信息WriteFile(hNamedPipe, szPipeIdentity, CHARLEN*(lstrlen(szPipeIdentity) + 1),&dwNumberOfByteWritten, NULL);//读出客户端传来的文件名ReadFile(hNamedPipe, szFileName, BUFFERSIZE, &dwNumberOfByteRead, NULL);//打开文件HANDLE hFile = CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ,NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);if(hFile == INVALID_HANDLE_VALUE){SetDlgItemText(hWinMain, IDC_FILENAME, TEXT("打开文件失败，请关闭重试"));return 1;}else{lstrcat(szFileName, TEXT("已打开"));SetDlgItemText(hWinMain, IDC_FILENAME, szFileName);}//读取文件内容并写入管道while(ReadFile(hFile, szText, BUFFERSIZE, &dwNumberOfByteRead, NULL) && dwNumberOfByteRead){MultiByteToWideChar(CP_ACP,0,(LPCSTR)szText,-1,szBuffer,dwNumberOfByteRead);WriteFile(hNamedPipe, szBuffer, CHARLEN * dwNumberOfByteRead, &dwNumberOfByteWritten, NULL);}CloseHandle(hNamedPipe);CloseHandle(hFile);return 0;}

客户端：

/*by: Peter_ZHAat: Oct 3rd, 2009*/#include "resource.h"#include <Windows.h>//=================函数声明===========================BOOL CALLBACK MainDlg(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);DWORD WINAPI ThreadProc(LPVOID lParam);//=================全局数据=========================#ifdef UNICODE#define CHARLEN 2#else#define CHARLEN 1#endif // UNICODEHWND hWinMain;#define BUFFERSIZE 512TCHAR *szPipeName = TEXT("////.//pipe//testPipe");TCHAR *szPipeIdentity = TEXT("I am the true server");TCHAR *szFileName = TEXT("d://textfile.txt");TCHAR szBuffer[BUFFERSIZE];//==================主函数================================int WINAPI WinMain( __in HINSTANCE hInstance, __in_opt HINSTANCE hPrevInstance, __in_opt LPSTR lpCmdLine, __in int nShowCmd ){DialogBoxParam(hInstance, MAKEINTRESOURCE(IDD_MAINDLG), NULL, MainDlg, NULL);return 0;}//====================窗口函数===================================BOOL CALLBACK MainDlg(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){switch(message){case WM_INITDIALOG:hWinMain = hDlg;CreateThread(NULL, 0, ThreadProc, NULL, NULL, NULL);return TRUE;case WM_COMMAND:switch(LOWORD(wParam)){case IDC_CLOSE:SendMessage(hDlg, WM_CLOSE, NULL, NULL);break;}return TRUE;case WM_CLOSE:EndDialog(hDlg, TRUE);return TRUE;}return FALSE;}//=====================线程函数==================DWORD CALLBACK ThreadProc (LPVOID lParam){static DWORD dwNumberOfByteWritten;static DWORD dwNumberOfByteRead;//---------------打开并连接管道-----------------------------HANDLE hNamedPipe = CreateFile(szPipeName, GENERIC_WRITE|GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);if(hNamedPipe == INVALID_HANDLE_VALUE){SetDlgItemText(hWinMain, IDC_STATE, TEXT("打开、连接管道失败,请关闭重试"));return FALSE;}//-----------------获取服务器身份信息--------------------------------ReadFile(hNamedPipe, szBuffer, BUFFERSIZE, &dwNumberOfByteRead, NULL);if(lstrcmp(szBuffer, szPipeIdentity) == 0){SetDlgItemText(hWinMain, IDC_STATE, TEXT("已连接"));}else{SetDlgItemText(hWinMain, IDC_STATE, TEXT("未成功连接服务器"));return FALSE;}//-----------------向管道写入文件名------------------------------WriteFile(hNamedPipe, szFileName, CHARLEN*(lstrlen(szFileName) + 1), &dwNumberOfByteWritten, NULL);SetDlgItemText(hWinMain, IDC_FILENAME, szFileName);EnableWindow(GetDlgItem(hWinMain, IDC_FILETEXT), TRUE);memset(szBuffer,TCHAR('/0'),lstrlen(szBuffer));while(ReadFile(hNamedPipe, szBuffer, BUFFERSIZE, &dwNumberOfByteRead, NULL) && dwNumberOfByteRead){SendDlgItemMessage(hWinMain, IDC_FILETEXT, EM_SETSEL, -1, -1);SendDlgItemMessage(hWinMain, IDC_FILETEXT, EM_REPLACESEL, FALSE, (LPARAM)szBuffer);}return TRUE;}

 

 

     这里有几点要注意：

     因为服务端等待客户端连接时，会停留在ConnectNamedPipe(hNamedPipe, NULL)处，为了让对话框依然能够与用户进行交互，将创建管道等功能操作置于另一线程中；同样客户端也用了多线程技术。

     再就是向管道中写入信息时，因为定义UNICODE后，TCHAR占2bytes；所以向管道写入时，WriteFile的第三个参数（DOWRD nNumberOfBytesToWrite [in] Number of bytes to write to the file. ）因由字符串长度乘以 2 。所以在程序中定义了CHARLEN（在UNICODE定义时为2，UNICODE为定义时为1）于字符串长度相乘（刚开始弄时没注意搞了好久好久，人都要疯掉了，题外话）

    最后就是从文件中读入内容后，要用MultiByteToWideChar处理下（具体用法参阅别处），不然往EDIT控件中写入后是乱码。

 

     我是新手，刚开始这方面的编程；有程序中有哪里不对的或者不妥的，请大侠帮忙指出来谢谢！

     我的第一篇文章，伤人的砖就别拍了。

 

     如果，小概率事件发生了，您要转载，或者使用这些代码，请注明出处：

 http://blog.csdn.net/zha_1525515/archive/2009/10/04/4631951.aspx