C语言编写 Win32 服务实例

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

#define SLEEP_TIME 5000
#define LOGFILE "C:\\MyServices\\memstatus.txt"

////////////////////////////////////////////////////////////
// Declare several global variables to share
// their values across multiple functions of your program.
////////////////////////////////////////////////////////////
SERVICE_STATUS ServiceStatus;
SERVICE_STATUS_HANDLE hStatus;

////////////////////////////////////////////////////////////
// Make the forward definitions of functions prototypes.
//
////////////////////////////////////////////////////////////
void ServiceMain(int argc, char** argv);
void ControlHandler(DWORD request);
int InitService();

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

// Service initialization
int InitService()
{
OutputDebugString("Monitoring started.");
int result;
result = WriteToLog("Monitoring started.");
return(result);
}

// Control Handler
void ControlHandler(DWORD request)
{
switch(request)
{
case SERVICE_CONTROL_STOP:
OutputDebugString("Monitoring stopped.");
WriteToLog("Monitoring stopped.");

ServiceStatus.dwWin32ExitCode = 0;
ServiceStatus.dwCurrentState = SERVICE_STOPPED;
SetServiceStatus (hStatus, &ServiceStatus);
return;

case SERVICE_CONTROL_SHUTDOWN:
OutputDebugString("Monitoring stopped.");
WriteToLog("Monitoring stopped.");

ServiceStatus.dwWin32ExitCode = 0;
ServiceStatus.dwCurrentState = SERVICE_STOPPED;
SetServiceStatus (hStatus, &ServiceStatus);
return;

default:
break;
}

// Report current status
SetServiceStatus (hStatus, &ServiceStatus);

return;
}

void ServiceMain(int argc, char** argv)
{
int error;

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(
"MemoryStatus",
(LPHANDLER_FUNCTION)ControlHandler);
if (hStatus == (SERVICE_STATUS_HANDLE)0)
{
// Registering Control Handler failed
return;
}

// Initialize Service
error = InitService();
if (error)
{
// Initialization failed
ServiceStatus.dwCurrentState =
SERVICE_STOPPED;
ServiceStatus.dwWin32ExitCode = -1;
SetServiceStatus(hStatus, &ServiceStatus);
return;
}
// We report the running status to SCM.
ServiceStatus.dwCurrentState =
SERVICE_RUNNING;
SetServiceStatus (hStatus, &ServiceStatus);

MEMORYSTATUS memory;
// The worker loop of a service
while (ServiceStatus.dwCurrentState ==
SERVICE_RUNNING)
{
char buffer[16];
GlobalMemoryStatus(&memory);
sprintf(buffer, "%d", memory.dwAvailPhys);

OutputDebugString(buffer);
int result = WriteToLog(buffer);
if (result)
{
ServiceStatus.dwCurrentState =
SERVICE_STOPPED;
ServiceStatus.dwWin32ExitCode = -1;
SetServiceStatus(hStatus,
&ServiceStatus);
return;
}
Sleep(SLEEP_TIME);
}
return;
}

void main(int argc, char* argv[])
{
SERVICE_TABLE_ENTRY ServiceTable[2];
ServiceTable[0].lpServiceName = "MemoryStatus";
ServiceTable[0].lpServiceProc = (LPSERVICE_MAIN_FUNCTION)ServiceMain;

ServiceTable[1].lpServiceName = NULL;
ServiceTable[1].lpServiceProc = NULL;
// Start the control dispatcher thread for our service
StartServiceCtrlDispatcher(ServiceTable);
}

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