How to store and write in a file

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I'm writing a code to list and print the windows services in a file. It runs fine and i have attached the code here.

FILE *fp;
fp=fopen("file.txt","w");
if ((EnumServicesStatusEx(
                    scHandle,
                    SC_ENUM_PROCESS_INFO,
                    SERVICE_TYPE_ALL,
                    SERVICE_STATE_ALL,
                    data,
                    bytesNeeded,
                    &bytesNeeded,
                    &servicesReturnedCount,
                    NULL,
                    NULL)))
                {
                  fprintf(fp,"works");
                    LPENUM_SERVICE_STATUS_PROCESS essp = { NULL };

                    for (DWORD i = 0; i < servicesReturnedCount; ++i)
                    {
                        serv[i].ServiceName = essp[i].lpServiceName;
                        serv[i].DisplayName = essp[i].lpDisplayName;
                        serv[i].Status = essp[i].ServiceStatusProcess;
                        fprintf(fp, "%s %s %s", (char *)serv[i].ServiceName,(char *)serv[i].DisplayName, serv[i].Status);

                    }
                    fclose(fp);
                  
                }

The problem I'm having is that I don't know how to fetch and write the enumerated list of services. I have used a struct to store. I'm not sure if i'm fetching the list of services correctly.

What I have tried:

I have used

 auto essp = reinterpret_cast<LPENUM_SERVICE_STATUS_PROCESS>(buffer.data());
for (int i = 0 ; i < servicesReturnedCount; ++i)
                  { 
                     auto ssp = ServiceStatusProcess{};
                     ssp.ServiceName = essp[i].lpServiceName;
                     ssp.DisplayName = essp[i].lpDisplayName;
                     ssp.Status = essp[i].ServiceStatusProcess;

                     ssps.push_back(ssp);
                  }

in C++. I'm not familiar in c. Kindly help me with this.

Posted 4-May-21 6:02am

Member 15076657

Updated 4-May-21 6:30am

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Comments

KarstenK 4-May-21 12:54pm

you need to allocate some memory for the data fetch. Try to learn the language when you want to talk to the computer ;-)

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Richard MacCutchan · Accepted Answer · 2021-05-04T06:30:00

Solution 1

This is essentially the same question you already posted at List windows services in a file using C[^]. And I already explained how you need to allocate the memory for the returned data. And again you are trying to extract data from a buffer that has not been allocated.

Posted 4-May-21 6:30am

Richard MacCutchan