获取父进程ID

本程序主要功能是：获取某程序的ParentProcessID

直接上代码:

 // parent.cpp (Windows NT/2000)
 //
 // This example will show the method how you can retrieve the parent
 // process ID on Windows NT/2000 using the NT Native API
 //
 //
 // (c)1999 Ashot Oganesyan K, SmartLine, Inc
 // mailto:ashot@aha.ru, http://www.protect-me.com, http://www.codepile.com  

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

 #define ProcessBasicInformation 0  

 typedef struct
 {
     DWORD ExitStatus;
     DWORD PebBaseAddress;
     DWORD AffinityMask;
     DWORD BasePriority;
     ULONG UniqueProcessId;
     ULONG InheritedFromUniqueProcessId;
 }   PROCESS_BASIC_INFORMATION;  

 // ntdll!NtQueryInformationProcess (NT specific!)
 //
 // The function copies the process information of the
 // specified type into a buffer
 //
 // NTSYSAPI
 // NTSTATUS
 // NTAPI
 // NtQueryInformationProcess(
 //    IN HANDLE ProcessHandle,              // handle to process
 //    IN PROCESSINFOCLASS InformationClass, // information type
 //    OUT PVOID ProcessInformation,         // pointer to buffer
 //    IN ULONG ProcessInformationLength,    // buffer size in bytes
 //    OUT PULONG ReturnLength OPTIONAL      // pointer to a 32-bit
 //                                          // variable that receives
 //                                          // the number of bytes
 //                                          // written to the buffer
 // );
 typedef LONG (WINAPI *PROCNTQSIP)(HANDLE,UINT,PVOID,ULONG,PULONG);  

 PROCNTQSIP NtQueryInformationProcess;  

 DWORD GetParentProcessID(DWORD dwId);  

 void main(int argc, char* argv[])
 {
     if (argc<)
     {
        printf("Usage:\n\nparent.exe ProcId\n");
        return;
     }  

     NtQueryInformationProcess = (PROCNTQSIP)GetProcAddress(
                                             GetModuleHandle("ntdll"),
                                             "NtQueryInformationProcess"
                                             );  

     if (!NtQueryInformationProcess)
        return;  

     DWORD dwId;
     sscanf(argv[],"%lu",&dwId);  

     printf("Parent PID for %lu is %lu\n",dwId,GetParentProcessID(dwId));  

 }  

 DWORD GetParentProcessID(DWORD dwId)
 {
     LONG                      status;
     DWORD                     dwParentPID = (DWORD)-;
     HANDLE                    hProcess;
     PROCESS_BASIC_INFORMATION pbi;  

     // Get process handle
     hProcess = OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,dwId);
     if (!hProcess)
        return (DWORD)-;  

     // Retrieve information
     status = NtQueryInformationProcess( hProcess,
                                         ProcessBasicInformation,
                                         (PVOID)&pbi,
                                         sizeof(PROCESS_BASIC_INFORMATION),
                                         NULL
                                       );  

     // Copy parent Id on success
     if  (!status)
         dwParentPID = pbi.InheritedFromUniqueProcessId;  

     CloseHandle (hProcess);  

    return dwParentPID;
 }