Q
: How do I execute a program and have my code wait until it is finished?
A:
uses Wintypes,WinProcs,Toolhelp,Classes,Forms;
Function WinExecAndWait(Path : string; Visibility : word) : word;
var
InstanceID : THandle;
begin
InstanceID := WinExec(Pchar(Path),Visibility);
if InstanceID < 32 then { a value less than 32 indicates an Exec error }
WinExecAndWait := InstanceID
else
begin
Repeat
Application.ProcessMessages;
until Application.Terminated or (GetModuleUsage(InstanceID) = 0);
WinExecAndWait := 32;
end;
end;
{* executes a named external application under windows and waits for the application to terminate before resuming execution. Any parameters to the exe file are also included in the filename string}
Function TForm1.WinExecute32Wait(FileName : AnsiString) : integer;
var
zAppName:array[0..512] of char;
zCurDir:array[0..255] of char;
WorkDir:String;
StartupInfo:TStartupInfo;
ProcessInfo:TProcessInformation;
res : DWord;
begin
StrPCopy(zAppName,FileName);
GetDir(0,WorkDir);
StrPCopy(zCurDir, ExtractFilePath(FileName));
FillChar(StartupInfo, Sizeof(StartupInfo),#0);
StartupInfo.cb := Sizeof(StartupInfo);
StartupInfo.dwFlags := STARTF_USESHOWWINDOW;
StartupInfo.wShowWindow := SW_HIDE; // hide the application window
// StartupInfo.wShowWindow := SW_SHOW;
if not CreateProcess(nil,
zAppName, { pointer to command line string }
nil, { pointer to process security attributes}
nil, { pointer to thread security attributes }
false, { handle inheritance flag }
CREATE_NEW_CONSOLE or { creation flags }
NORMAL_PRIORITY_CLASS,
nil, { pointer to new environment block }
nil, { pointer to current directory name }
StartupInfo, { pointer to STARTUPINFO }
ProcessInfo) then Result := 0 { pointer to PROCESS_INF }
else begin
WaitforSingleObject(ProcessInfo.hProcess,INFINITE);
GetExitCodeProcess(ProcessInfo.hProcess, res);
result := res;
end;
end;