How to execute a command and then wait for it to finish.
procedure ExecAndWait(CommandLine: string; CommandShow: Longint);
var
pi: TProcessInformation;
si: TStartupInfo;
begin
FillChar(si, sizeof(si), #0);
si.cb := sizeof(si);
si.dwFlags := STARTF_USESHOWWINDOW;
si.wShowWindow := CommandShow;
CreateProcess(nil, PChar(CommandLine), nil, nil, False, NORMAL_PRIORITY_CLASS, nil, nil, si, pi);
WaitForSingleObject(pi.hProcess, INFINITE);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
end;