第一种使用互斥体

// 使用互斥体保证单体运行
BOOL IsAlreadyRun()
{HANDLE hMutex = NULL;hMutex = CreateMutex(NULL, FALSE, L"MYFLAG");if (hMutex != NULL){if (ERROR_ALREADY_EXISTS == GetLastError()){ReleaseMutex(hMutex);return TRUE;}}return FALSE;
}
int main()
{if (IsAlreadyRun()){return 0;}
}

第二种使用共享内存

// 创建共享内存段
#pragma data_seg("sharedata")
DWORD dwFlagId = 0xEE;
#pragma data_seg()
#pragma comment(linker, "/SECTION:sharedata,RWS")// 使用共享内存段保证单体运行
BOOL IsAlreadyRun()
{if (dwFlagId == 0xEF){return TRUE;}return FALSE;
}
//-------------------------------
int main()
{if (IsAlreadyRun()){return 0;}else{dwFlagId = 0xEF;}
}