How to create a process and wait till it ends in C++

[Saman]

With this function you can launch an executable file and wait until it finishes the operation.

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Using C Syntax Highlighting

1. size_t ExecuteProcess(std::wstring FullPathToExe, std::wstring Parameters, size_t SecondsToWait){
2.  
3.         size_t iMyCounter = 0, iReturnVal = 0, iPos = 0;
4.         DWORD dwExitCode = 0;
5.         std::wstring sTempStr = L"";
6.  
7.         /* - NOTE - You should check here to see if the exe even exists */
8.  
9.         /* Add a space to the beginning of the Parameters */
10.         if (Parameters.size() != 0){
11.                         if (Parameters[0] != L' '){
12.                                 Parameters.insert(0,L" ");
13.                         }
14.         }
15.  
16.         /* The first parameter needs to be the exe itself */
17.         sTempStr = FullPathToExe;
18.         iPos = sTempStr.find_last_of(L"\\");
19.         sTempStr.erase(0, iPos +1);
20.         Parameters = sTempStr.append(Parameters);
21.  
22.         /* CreateProcessW can modify Parameters thus we allocate needed memory */
23.         wchar_t * pwszParam = new wchar_t[Parameters.size() + 1];
24.         if (pwszParam == 0){
25.                 return 1;
26.         }
27.         const wchar_t* pchrTemp = Parameters.c_str();
28.         wcscpy_s(pwszParam, Parameters.size() + 1, pchrTemp);
29.  
30.         /* CreateProcess API initialization */
31.         STARTUPINFOW siStartupInfo;
32.         PROCESS_INFORMATION piProcessInfo;
33.         memset(&siStartupInfo, 0, sizeof(siStartupInfo));
34.         memset(&piProcessInfo, 0, sizeof(piProcessInfo));
35.         siStartupInfo.cb = sizeof(siStartupInfo);
36.  
37.         if (CreateProcessW(const_cast<LPCWSTR>(FullPathToExe.c_str()), pwszParam, 0, 0, false, CREATE_DEFAULT_ERROR_MODE, 0, 0, &siStartupInfo, &piProcessInfo) != false){
38.                 /* Watch the process. */
39.                 dwExitCode = WaitForSingleObject(piProcessInfo.hProcess, (SecondsToWait * 1000));
40.         }
41.         else{
42.                 /* CreateProcess failed */
43.                 iReturnVal = GetLastError();
44.         }
45.  
46.         /* Free memory */
47.         delete[]pwszParam;
48.         pwszParam = 0;
49.  
50.         /* Release handles */
51.         CloseHandle(piProcessInfo.hProcess);
52.         CloseHandle(piProcessInfo.hThread);
53.  
54.         return iReturnVal;
55. }
56.  

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