Windows RPC编程入门(已动手实践按红体字部分修改可以正常运行)

Windows本身支持成为一个RPC服务器。MSDN里面有个很好的例子，但是，WindowsXP上面默认的RPC/tcpip功能没有打开，必须运行gpedit.msc，计算机配置->管理模版->系统->远程过程调用->用于未验证的RPC...->选择"已启动"，限定项选择"无"。用VC2010express建立两个工程，按照MSDN的例子:
    首先，idl文件my.idl:

[   uuid(ba209999-0c6c-11d2-97cf-00c04f8eea45),   version(1.0) ] interface hw // The interface is named hw {    // A function that takes a zero-terminated string.    void Hello(       [in, string] const char* szOutput); }

    编译以后，相应的文件放到服务器端和客户端程序里面去。
    服务器端实现:

#include"stdafx.h" #include<stdio.h> #include<stdlib.h> #include"my_h.h" #pragma comment(lib,"rpcrt4") #pragma comment(lib,"ole32") extern "C"{ void Hello(handle_t IDL_handle,const unsigned char*psz){     printf("server:%s\n",psz); } void Shutdown(handle_t IDL_handle){     RpcMgmtStopServerListening(NULL);     RpcServerUnregisterIf(NULL,NULL,FALSE); } void* /*__RPC_FAR**/ __RPC_USER midl_user_allocate(size_t len){     return(malloc(len)); } void __RPC_USER midl_user_free(void __RPC_FAR* ptr){     free(ptr); } } int main() {    RPC_STATUS status;    status = RpcServerUseProtseqEp(       (RPC_CSTR)("ncacn_ip_tcp"), // Use TCP/IP protocol.       RPC_C_PROTSEQ_MAX_REQS_DEFAULT, // Backlog queue length for TCP/IP.       (RPC_CSTR)("4747"), // TCP/IP port to use.       NULL); // No security.    if (status){        printf("ServerUse failed\n");        exit(status);}    else printf("UseProtseqEq ok\n");    status = RpcServerRegisterIf(       hw_v1_0_s_ifspec, // Interface to register.       NULL, // Use the MIDL generated entry-point vector.       NULL);// Use the MIDL generated entry-point vector.    if (status){        printf("Register failed\n");        exit(status);}    else printf("Register if ok\n");    // This call will not return until    // RpcMgmtStopServerListening is called.    status = RpcServerListen(      1, // Recommended minimum number of threads.      RPC_C_LISTEN_MAX_CALLS_DEFAULT, // Recommended maximum number of threads.      FALSE); // Start listening now.    if (status){        printf("Server listen failed\n");        exit(status);}    else printf("listen ok\n");    return 0; }

    启动以后显示:
UseProtseqEq ok
Register if ok
    客户端代码:

// myclient.cpp : Defines the entry point for the console application. #include"stdafx.h" #include<windows.h> #include<stdio.h> #include"my_h.h" #pragma comment(lib,"rpcrt4") #pragma comment(lib,"ole32") int main(void){     RPC_STATUS status;     RPC_BINDING_HANDLE hwBinding;     unsigned char* szStringBinding=NULL;     status=RpcStringBindingCompose(//建立一个String Binding句柄，并不连接         NULL,         (RPC_CSTR)("ncacn_ip_tcp"),         (RPC_CSTR)("localhost"),         (RPC_CSTR)("4747"),         NULL,         (RPC_CSTR*)&szStringBinding);     if(status){         printf("StringBinding failed\n");         exit(status);}     printf("szString=%s\n",szStringBinding);     status=RpcBindingFromStringBinding(         szStringBinding,         &hwBinding);     if(status){         printf("Bind from String failed:%d\n",GetLastError());         exit(status);}     RpcTryExcept{                 Hello(hwBinding,(RPC_CSTR)("Hello RPC World!"));    }    RpcExcept(1){       printf("Runtime reported exception:%d,except=%d\n",GetLastError(),RpcExceptionCode()/*RPC_S_ACCESS_DENIED==5L*/);//这里返回了5    }    RpcEndExcept    status = RpcBindingFree(&hwBinding); // Frees the binding handle.    if (status){        printf("Bind free failed\n");        exit(status);}     return 0; } void* __RPC_USER midl_user_allocate(size_t size){     return malloc(size); } // Memory deallocation function for RPC. void __RPC_USER midl_user_free(void* p){     free(p); }

    运行显示:
szString=ncacn_ip_tcp:localhost[4747]

    此时，服务器端显示:
server:Hello RPC World!
    多次启动客户端，上面这句话显示多次。