我打电话给别的程序只显示一个网页是这样的:
问题:如果我的按钮创建一个进程,并同时创建的过程是开放的,我点击调用窗体上的复选框,我关闭创建过程中的复选框被选中。
我试图用所看到的.ShowModal功能DisableTaskWindows(0)。但是,如我所料不工作。虽然它禁用的形式。但经过我允许它,它好像形式反正处理click事件。有点像,如果它有一个消息队列或东西。
谁能告诉我它是什么,我做错了什么?
procedure TForm1.Button1Click(Sender: TObject);
var
StartupInfo : TStartupInfo;
ProcessInfo : TProcessInformation;
ProcessCreated : Boolean;
CommandLine : string;
WindowList: TTaskWindowList;
begin
WindowList := DisableTaskWindows(0);
CommandLine:='webmodule.exe';
uniqueString(CommandLine);
ZeroMemory(@StartupInfo, SizeOf(StartupInfo));
StartupInfo.cb := SizeOf(StartupInfo);
ProcessCreated := CreateProcess(PChar(nil), PChar(CommandLine), nil, nil, false, 0, nil, nil, StartupInfo, ProcessInfo);
if ProcessCreated then
WaitForSingleObject(ProcessInfo.hProcess, INFINITE)
else
ShowMessage('Error : could not execute!');
CloseHandle(ProcessInfo.hProcess);
CloseHandle(ProcessInfo.hThread);
EnableTaskWindows(WindowList);
end;
UPDATE
不幸的是,我不知道如何一个使用RegisterWaitForSingleObject功能...我想这一点,但不工作。我缺少回调的可能?但我不知道如何使用它。
if ProcessCreated then
begin
// WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
while (RegisterWaitForSingleObject(ProcessInfo.hProcess,ProcessInfo.hProcess,nil,nil,INFINITE,0) = false) do
begin
Form1.Color:=RGB(random(255),random(255),random(255));
Application.ProcessMessages;
end;
CloseHandle(ProcessInfo.hProcess);
CloseHandle(ProcessInfo.hThread);
end
else
ShowMessage('Error : could not execute!');
更新2:
我想我可能已经解决了它,我删除窗体的启用禁用。相反,我做到这一点后,我执行的过程。
while PeekMessage(Msg, 0, WM_KEYFIRST, WM_KEYLAST, PM_REMOVE or PM_NOYIELD) do;
while PeekMessage(Msg, 0, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE or PM_NOYIELD) do;
问题是,你是阻止您的应用程序的主消息循环,同时等待衍生的进程退出,这样你就不会允许你的应用程序来处理用户输入,直到该过程结束后。您需要正常让你的应用程序的消息,不要阻止他们。如果您在衍生的进程正在运行禁用的形式,用户输入将被自动丢弃你。
尝试更多的东西是这样的:
procedure TForm1.Button1Click(Sender: TObject);
var
StartupInfo : TStartupInfo;
ProcessInfo : TProcessInformation;
CommandLine : string;
begin
CommandLine := 'webmodule.exe';
UniqueString(CommandLine);
ZeroMemory(@StartupInfo, SizeOf(StartupInfo));
StartupInfo.cb := SizeOf(StartupInfo);
if not CreateProcess(PChar(nil), PChar(CommandLine), nil, nil, FALSE, 0, nil, nil, StartupInfo, ProcessInfo) then
begin
ShowMessage('Error : could not execute!');
Exit;
end;
CloseHandle(ProcessInfo.hThread);
Enabled := False;
repeat
case MsgWaitForMultipleObjects(1, ProcessInfo.hProcess, FALSE, INFINITE, QS_ALLINPUT) of
WAIT_OBJECT_0: Break;
WAIT_OBJECT_0+1: Application.ProcessMessages;
else
begin
ShowMessage('Error : could not wait!');
Break;
end;
end;
until False;
CloseHandle(ProcessInfo.hProcess);
Enabled := True;
end;
或这个:
type
TForm1 = class(ToFrm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
...
private
hWaitObj, hWaitProcess: THandle;
procedure WaitFinished;
...
end;
...
procedure WaitCallback(lpParameter: Pointer; WaitFired: Boolean); stdcall;
begin
TThread.Queue(nil, TForm1(lpParameter).WaitFinished);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
StartupInfo : TStartupInfo;
ProcessInfo : TProcessInformation;
CommandLine : string;
begin
CommandLine := 'webmodule.exe';
UniqueString(CommandLine);
ZeroMemory(@StartupInfo, SizeOf(StartupInfo));
StartupInfo.cb := SizeOf(StartupInfo);
if not CreateProcess(PChar(nil), PChar(CommandLine), nil, nil, FALSE, 0, nil, nil, StartupInfo, ProcessInfo) then
begin
ShowMessage('Error : could not execute!');
Exit;
end;
CloseHandle(ProcessInfo.hThread);
if not RegisterWaitForSingleObject(hWaitObj, ProcessInfo.hProcess, WaitCallback, Self, INFINITE, WT_EXECUTELONGFUNCTION or WT_EXECUTEONLYONCE) then
begin
CloseHandle(ProcessInfo.hProcess);
ShowMessage('Error : could not wait!');
Exit;
end;
hWaitProcess := ProcessInfo.hProcess;
Enabled := False;
end;
procedure TForm1.WaitFinished;
begin
UnregisterWait(hWaitObj);
CloseHandle(hWaitProcess);
Enabled := True;
end;