在Windows中,C++程序可通過API注冊(cè)為系統(tǒng)服務(wù),實(shí)現(xiàn)后臺(tái)運(yùn)行與開機(jī)自啟。首先編寫ServiceMain和ServiceCtrlHandler函數(shù)處理服務(wù)啟動(dòng)與控制命令,接著使用CreateService安裝服務(wù)、DeleteService卸載服務(wù),并在main函數(shù)中通過命令行參數(shù)區(qū)分安裝、卸載與運(yùn)行模式,最終通過StartServiceCtrlDispatcher接入服務(wù)控制管理器。需管理員權(quán)限操作,且建議先以普通進(jìn)程調(diào)試邏輯。
在Windows系統(tǒng)中,C++程序可以通過調(diào)用Windows服務(wù)控制管理器(SCM)的API將自身注冊(cè)為系統(tǒng)服務(wù)。這種方式可以讓程序在后臺(tái)運(yùn)行,隨系統(tǒng)啟動(dòng)自動(dòng)加載,無需用戶登錄。以下是實(shí)現(xiàn)步驟和關(guān)鍵代碼示例。
每個(gè)Windows服務(wù)都需要一個(gè)服務(wù)入口函數(shù)(Service Main),以及一個(gè)處理控制請(qǐng)求的回調(diào)函數(shù)(如停止、暫停等)。
示例代碼:
#include <windows.h> <p>SERVICE_STATUS g_ServiceStatus = {0}; SERVICE_STATUS_HANDLE g_StatusHandle = NULL; HANDLE g_hStopEvent = INVALID_HANDLE_VALUE;</p><p>VOID WINAPI ServiceMain(DWORD argc, LPTSTR *argv); VOID WINAPI ServiceCtrlHandler(DWORD control); DWORD RunService();</p><p>// 服務(wù)入口 VOID WINAPI ServiceMain(DWORD argc, LPTSTR *argv) { g_StatusHandle = RegisterServiceCtrlHandler(TEXT("MyService"), ServiceCtrlHandler); if (g_StatusHandle == NULL) return;</p><pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">g_ServiceStatus.dwServiceType = SERVICE_WIN32; g_ServiceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP; g_ServiceStatus.dwCurrentState = SERVICE_START_PENDING; g_ServiceStatus.dwWin32ExitCode = 0; g_ServiceStatus.dwServiceSpecificExitCode = 0; g_ServiceStatus.dwCheckPoint = 0; g_ServiceStatus.dwWaitHint = 0; SetServiceStatus(g_StatusHandle, &g_ServiceStatus); g_hStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL); if (g_hStopEvent == NULL) { g_ServiceStatus.dwCurrentState = SERVICE_STOPPED; g_ServiceStatus.dwWin32ExitCode = GetLastError(); SetServiceStatus(g_StatusHandle, &g_ServiceStatus); return; } g_ServiceStatus.dwCurrentState = SERVICE_RUNNING; SetServiceStatus(g_StatusHandle, &g_ServiceStatus); // 實(shí)際的服務(wù)工作邏輯 RunService(); // 等待停止信號(hào) WaitForSingleObject(g_hStopEvent, INFINITE); g_ServiceStatus.dwCurrentState = SERVICE_STOPPED; SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
}
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// 控制處理函數(shù) VOID WINAPI ServiceCtrlHandler(DWORD control) { switch(control) { case SERVICE_CONTROL_STOP: g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING; SetServiceStatus(g_StatusHandle, &g_ServiceStatus); SetEvent(g_hStopEvent); break; default: break; } }
使用CreateService
函數(shù)將程序安裝為系統(tǒng)服務(wù)。需要管理員權(quán)限。
示例代碼:
BOOL InstallService(LPCTSTR szPath) { SC_HANDLE schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); if (schSCManager == NULL) return FALSE; <pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">SC_HANDLE schService = CreateService( schSCManager, TEXT("MyService"), TEXT("My Sample Service"), SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, // 隨系統(tǒng)啟動(dòng) SERVICE_ERROR_NORMAL, szPath, NULL, NULL, NULL, NULL, NULL); if (schService == NULL) { CloseServiceHandle(schSCManager); return FALSE; } CloseServiceHandle(schService); CloseServiceHandle(schSCManager); return TRUE;
}
通過刪除服務(wù)對(duì)象來卸載服務(wù)。
BOOL RemoveService() { SC_HANDLE schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); if (schSCManager == NULL) return FALSE; <pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">SC_HANDLE schService = OpenService(schSCManager, TEXT("MyService"), SERVICE_ALL_ACCESS); if (schService == NULL) { CloseServiceHandle(schSCManager); return FALSE; } BOOL result = DeleteService(schService); CloseServiceHandle(schService); CloseServiceHandle(schSCManager); return result;
}
通常通過命令行參數(shù)決定是安裝服務(wù)還是運(yùn)行服務(wù)。
int main(int argc, char* argv[]) { if (argc > 1 && strcmp(argv[1], "install") == 0) { TCHAR szPath[MAX_PATH]; GetModuleFileName(NULL, szPath, MAX_PATH); if (InstallService(szPath)) { printf("Service installed successfully.\n"); } else { printf("Failed to install service.\n"); } return 0; } else if (argc > 1 && strcmp(argv[1], "remove") == 0) { if (RemoveService()) { printf("Service removed.\n"); } else { printf("Failed to remove service.\n"); } return 0; } else { SERVICE_TABLE_ENTRY ServiceTable[] = { {TEXT("MyService"), (LPSERVICE_MAIN_FUNCTION)ServiceMain}, {NULL, NULL} }; <pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;"> if (StartServiceCtrlDispatcher(ServiceTable) == FALSE) { return GetLastError(); } } return 0;
}
編譯后可執(zhí)行以下操作:
myapp.exe install
—— 安裝服務(wù)myapp.exe remove
—— 卸載服務(wù)基本上就這些。確保以管理員權(quán)限運(yùn)行安裝命令,并注意服務(wù)名稱唯一性。調(diào)試服務(wù)時(shí)建議先以普通進(jìn)程測(cè)試邏輯,再注冊(cè)為服務(wù)。
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