调用可执行程序的问题(100分)

调用一个可执行程序时，如何才能做到当调用的可执行程序退出后，才能继
续执行本程序后面的代码。就好象 Form1.ShowModal 一样？

/////copy
var
sCommandLine: string;
bCreateProcess: boolean;
lpStartupInfo: TStartupInfo;
lpProcessInformation: TProcessInformation;
begin
sCommandLine := 'ARJ.EXE /?';
bCreateProcess := CreateProcessA(nil, PChar(sCommandLine),
nil, nil, True, NORMAL_PRIORITY_CLASS, nil, nil,
lpStartupInfo, lpProcessInformation);
if bCreateProcess then
WaitForSingleObject(lpProcessInformation.hProcess, INFINITE);
end;
//////////////////////////////////////////////
var
pWindowsList: pointer;
hActiveWindow: HWnd;
hExeHandle: THandle;
begin
pWindowsList := DisableTaskWindows(0);
hActiveWindow := GetActiveWindow;
try
hExeHandle := WinExec('arj.exe /?',SW_SHOWNORMAL);
while GetModuleUsage(hExeHandle) <> 0 do
Application.ProcessMessages;
finally
EnableTaskWindows(pWindowsList);
SetActiveWindow(hActiveWindow);
end;
end;
/////////////////////////////////////////////////////////////////////
{the first example, based on WaitForSingleObject}
function WinExecAndWait32_v1(FileName: string; Visibility: integer):
Cardinal; {integer}
var
zAppName: array[0..512] of char;
zCurDir: array[0..255] of char;
WorkDir: string;
StartupInfo: TStartupInfo;
ProcessInfo: TProcessInformation;
begin
StrPCopy(zAppName, FileName);
GetDir(0, WorkDir);
StrPCopy(zCurDir, WorkDir);
FillChar(StartupInfo, Sizeof(StartupInfo), #0);
StartupInfo.cb := Sizeof(StartupInfo);
StartupInfo.dwFlags := STARTF_USESHOWWINDOW;
StartupInfo.wShowWindow := Visibility;
if not CreateProcess(nil,
zAppName, { pointer to command line string }
nil, { pointer to process security attributes }
nil, { pointer to thread security attributes }
true, { handle inheritance flag }
CREATE_NEW_CONSOLE or { creation flags }
NORMAL_PRIORITY_CLASS,
nil, { pointer to new environment block }
nil, { pointer to current directory name, PChar}
StartupInfo, { pointer to STARTUPINFO }
ProcessInfo) { pointer to PROCESS_INF }
then Result := INFINITE {-1} else
begin
WaitforSingleObject(ProcessInfo.hProcess, INFINITE);
GetExitCodeProcess(ProcessInfo.hProcess, Result);
CloseHandle(ProcessInfo.hProcess); { to prevent memory leaks }
CloseHandle(ProcessInfo.hThread);
end;
end;

{the second example, based on PeekMessage(msg,,,,PM_REMOVE)->DispatchMessage(msg)}
function WinExecAndWait32_v2(FileName: string; Visibility: integer):
Cardinal; {integer}
var
zAppName: array[0..512] of char;
zCurDir: array[0..255] of char;
WorkDir: string;
StartupInfo: TStartupInfo;
ProcessInfo: TProcessInformation;
Msg: TagMsg;
ExitCode: cardinal;
begin
StrPCopy(zAppName, FileName);
GetDir(0, WorkDir);
StrPCopy(zCurDir, WorkDir);
FillChar(StartupInfo, Sizeof(StartupInfo), #0);
StartupInfo.cb := Sizeof(StartupInfo);
StartupInfo.dwFlags := STARTF_USESHOWWINDOW; // STARTF_FORCEONFEEDBACK;
StartupInfo.wShowWindow := Visibility;
if CreateProcess(nil, { and once more: }
zAppName, { pointer to command line string }
nil, { pointer to process security attributes }
nil, { pointer to thread security attributes }
false, { handle inheritance flag }
NORMAL_PRIORITY_CLASS, { creation flags }
nil, { pointer to the new environment block }
nil, { current directory name }
StartupInfo, { pointer to STARTUPINFO }
ProcessInfo) then { pointer to PROCESS_INF }
begin
repeat
while PeekMessage(Msg, 0, 0, 0, PM_REMOVE) do
begin
if (Msg.message = WM_QUIT) then
Result := Msg.wParam;
TranslateMessage(msg);
Dispatchmessage(msg);
Sleep(100); {your choice}
end;
GetExitCodeProcess(ProcessInfo.hProcess, ExitCode);
until (ExitCode <> STILL_ACTIVE);
CloseHandle(ProcessInfo.hThread);
CloseHandle(ProcessInfo.hProcess);
Result := 0;
end
else begin
Result := GetLastError;
end;
end;

编译显示:Undeclared identifier: 'GetModuleUsage'

function WinExecAndWait32(FileName: String; //调用EXE并等待其结束
Visibility: integer): DWORD;
var
zAppName:array[0..512] of char;
zCurDir:array[0..255] of char;
WorkDir:String;
StartupInfo:TStartupInfo;
ProcessInfo:TProcessInformation;
begin
StrPCopy(zAppName,FileName);
GetDir(0,WorkDir);
StrPCopy(zCurDir,WorkDir);
FillChar(StartupInfo,Sizeof(StartupInfo),#0);
StartupInfo.cb := Sizeof(StartupInfo);
StartupInfo.dwFlags := STARTF_USESHOWWINDOW;
StartupInfo.wShowWindow := Visibility;
if not CreateProcess(
nil,
zAppName,
nil,
nil,
false,
CREATE_NEW_CONSOLE or
NORMAL_PRIORITY_CLASS,
nil,
nil,
StartupInfo,
ProcessInfo
)
then Result := $FFFFFFFF else begin
WaitforSingleObject(ProcessInfo.hProcess,INFINITE);
GetExitCodeProcess(ProcessInfo.hProcess,Result);
end;
end;

多人接受答案了。