Usage and difference of shellexecute, shellexecuteex and winexec in QT

Today I want to introduce several ways to start the process with administrator privileges .
Namely ShellExecute,ShellExecuteEx,WinExec.
Their respective characteristics ：
ShellExecute： It's through windows The shell opens any file , Non executable files are automatically opened through the associated program , For executable files , Not much difference , however shellexcute You can specify the working path of the runtime
ShellExecuteEx： It goes with ShellExecute almost , The difference is its return value and support blocking operation .
WinExec： Only for executable files , It's an old function , Although easy to use , But the compatibility is not good .

ShellExecute Usage mode ：

filename = "xxx.exe";

std::wstring operate;
if (info.installAuth == 0)// Have administrator rights 
     operate = QString("runas").toStdWString();
else// No administrator rights 
     operate = L"open";
std::wstring file = QString("\"" + filename  + "\""). toStdWString();// Executable files 
        
filename = filename.left(filename.size()-QString(filename.split("/").last()).size());// Get the path of the execution file 
std::wstring path = filename.toStdWString();// Execution file path .
        
QString para = ”1“;// Parameters 1
QString para2 = “test”;// Parameters 2
QString tmp = para+“ ”+para2;
std::wstring lpParameters = tmp.toStdWString();// Merging parameters 

int ret = (int)ShellExecute(NULL,operate.c_str(), file.c_str(),lpParameters.c_str(),path.c_str(),SW_SHOWNORMAL);
QString sRet;
switch(ret)
{
case 0:
        sRet = QString("memory lack.");
        break;
case 2:
        sRet = QString("filename is error.");
        break;
case 3:
        sRet = QString("file path is error.");
        break;
case 11:
        sRet = QString("exe is invaliable.");
        break;
case 26:
        sRet = QString("shared error.");
        break;
case 27:
        sRet = QString("file is error or be short.");
        break;
case 28:
        sRet = QString("open time out.");
        break;
case 29:
        sRet = QString("DDE task failed.");
        break;
case 30:
        sRet = QString("undering other's DDE");
        break;
case 31:
        sRet = QString("no linked process.");
        break;
default:
        sRet = QString("unknow error.");
        break;
    }

if(ret <= 32){// Return value greater than 32 Express ShellExecute Successful implementation 
}
else{
}

ShellExecuteEx Usage mode ：

filename = "xxx.exe";

std::wstring operate;
if (info.installAuth == 0)// Have administrator rights 
     operate = QString("runas").toStdWString();
else// No administrator rights 
     operate = L"open";
std::wstring file = QString("\"" + filename  + "\""). toStdWString();// Executable files 
        
filename = filename.left(filename.size()-QString(filename.split("/").last()).size());// Get the path of the execution file 
std::wstring path = filename.toStdWString();// Execution file path .
        
QString para = ”1“;// Parameters 1
QString para2 = “test”;// Parameters 2
QString tmp = para+“ ”+para2;
std::wstring lpParameters = tmp.toStdWString();// Merging parameters 

SHELLEXECUTEINFO shExecinfo = {0};// Create an executable object 
shExecinfo.cbSize = sizeof(SHELLEXECUTEINFO);// Structure size 
shExecinfo.fMask = SEE_MASK_NOCLOSEPROCESS;
shExecinfo.hwnd = NULL;// Parent window handle 
shExecinfo.lpVerb = operate.c_str();// jurisdiction 
shExecinfo.lpFile = file.c_str();// Executable files 
shExecinfo.lpParameters = lpParameters.c_str();// Parameters 
shExecinfo.lpDirectory = path.c_str();// route 
shExecinfo.nShow = SW_SHOWNORMAL// Display mode ;
shExecinfo.hInstApp = NULL;
int ret = (int)ShellExecuteEx(&shExecinfo);
if (ret == 0)// Execution failure 
{}
else// Successful implementation 
{}

WaitForSingleObject(shExecinfo.hProcess, INFINITE);// Blocking , until ShellExecuteEx() The program executed is closed 

WinExec Usage mode ：

WinExec("cmd /c xxx.exe",SW_HIDE);// Direct execution , and system() similar , It's just system() Executive cmd Without administrator privileges