多线程socket通讯服务 《一》

最近在折腾我的EeePC, 装的xp系统，100G硬盘，没有显示器，是我的专用下载机。 另外一台台式机是Ubuntu。  想要写个Windows Service常驻在EeePC后台，然后就可以从Ubuntu或我的手机上控制它了。 初步期望有以下功能：

1. 可以启动或关闭指定程序，主要是emule和BT。可以关机。

2. 可以监视eMule和BT的下载目录，有下载完成的文件就move到台式机上，因为小机器100G硬盘不够用，几部高清就满了。

3. 可以从指定位置copy种子文件，并开启BT下载。

其实或许有现成软件可以凑合，比如ts客户端（手机和Ubuntu都有对应软件)，虽然做不到100%方便。 但出于练习网络及多线程编程的目的还是决定自己实现一个，服务端用c，客户端用python。 今天找了点windows服务的资料，翻了翻MSDN，先弄了个服务壳子出来：

#include <windows.h>
#include <stdio.h>

#define RECV_BUFF_SIZE 1024
#define LOGFILE "C:\\Workspace\\ServiceLog.txt"
#define MAX_LISTEN 5
#define S_NAME "Downlad Service By Crane"

SERVICE_STATUS ServiceStatus;
SERVICE_STATUS_HANDLE hStatus;

void ServiceMain(int argc, char **argv);
void ControlHandler(DWORD request);

int WriteToLog(char *str){
    FILE* log = NULL;
    log = fopen(LOGFILE, "a+");
    if (log == NULL){
        return -1;
    }
    fprintf(log, "%s\n", str);
    fclose(log);
    return 0;
}

int main(void){
    SERVICE_TABLE_ENTRY ServiceTable[2];
    ServiceTable[0].lpServiceName = S_NAME;
    ServiceTable[0].lpServiceProc = (LPSERVICE_MAIN_FUNCTION)ServiceMain;

    ServiceTable[1].lpServiceName = NULL;
    ServiceTable[1].lpServiceProc = NULL;
    int result = StartServiceCtrlDispatcher(ServiceTable);

    return 0;
}

void ServiceMain(int argc, char **argv){
    int error = 0;
    ServiceStatus.dwServiceType = SERVICE_WIN32;
    ServiceStatus.dwCurrentState = SERVICE_START_PENDING;
    ServiceStatus.dwControlsAccepted =
        SERVICE_ACCEPT_STOP |
        SERVICE_ACCEPT_SHUTDOWN;
    ServiceStatus.dwWin32ExitCode = 0;
    ServiceStatus.dwServiceSpecificExitCode = 0;
    ServiceStatus.dwCheckPoint = 0;
    ServiceStatus.dwWaitHint = 0;

    hStatus = RegisterServiceCtrlHandler(
                S_NAME,
                (LPHANDLER_FUNCTION)ControlHandler);
    if(hStatus == ((SERVICE_STATUS_HANDLE)0)){
        return;
    }
    error = WriteToLog("Download service started.");
    if(error){
        ServiceStatus.dwCurrentState =
            SERVICE_STOPPED;
        ServiceStatus.dwWin32ExitCode = -1;
        SetServiceStatus(hStatus,&ServiceStatus);
        return;
     }

     ServiceStatus.dwCurrentState =
         SERVICE_RUNNING;
     SetServiceStatus(hStatus, &ServiceStatus);
     
     while (ServiceStatus.dwCurrentState ==


                  SERVICE_RUNNING){
        if(WriteToLog("Service run.")){
            ServiceStatus.dwCurrentState =
                SERVICE_STOPPED;
            ServiceStatus.dwWin32ExitCode = -1;
            SetServiceStatus(hStatus, &ServiceStatus);
            return;
        }
        Sleep(5000);
     }

    return;
}

void ControlHandler(DWORD request)
{
   switch(request)
   {
      case SERVICE_CONTROL_STOP:
         WriteToLog("Download service stopped.");

         ServiceStatus.dwWin32ExitCode = 0;
         ServiceStatus.dwCurrentState = SERVICE_STOPPED;
         SetServiceStatus (hStatus, &ServiceStatus);
         return;
 
      case SERVICE_CONTROL_SHUTDOWN:
         WriteToLog("Download service stopped.");

         ServiceStatus.dwWin32ExitCode = 0;
         ServiceStatus.dwCurrentState = SERVICE_STOPPED;
         SetServiceStatus (hStatus, &ServiceStatus);
         return;
        
      default:
         break;
    }
 
    // Report current status

    SetServiceStatus (hStatus, &ServiceStatus);
 
    return;
}

周末有时间把Socket通讯加上去，最后一步再做多线程处理。