当DM应用程序窗口最小化时，如何处理由延迟任务发布的模式对话框？

建议以LaunchExternalProcess（）函数和外部程序为基础的解决方案提供了答案的途径。通过使用免费的开源Windows宏创建程序包AutoHotKey，我已经能够创建一个非常紧凑的名为RestoreDM.exe的可执行文件。通过将此可执行文件放置在可从DM脚本轻松访问的文件夹中，可以通过LaunchExternalProcessAsync（）启动该可执行文件，以确保在发布自定义对话框之前恢复DM应用程序窗口。下面是原始测试脚本的修改版本，说明了此解决方案，并提供了有关AutoHotKey脚本的详细信息：

class DeferredAlertTask
{
    Number deferredTaskID;

    DeferredAlertTask(Object self)
    {
        Number taskDelay_sec = 5;
        String message = "Click OK and then minimize the DM app window.\n";
        message += "After 5 seconds, select DM on the task bar to restore it.\n";
        message += "Dialog will be invisible, must hit 'enter' or 'esc' to go on.";
        OKDialog(message);

        deferredTaskID = AddMainThreadSingleTask(self, "Task", taskDelay_sec);
    }

    void Task(Object self)
    {
        String banner = "Error dialog";
        String message = "Error message details.";

        // Create the dialog box descriptor TagGroup
        TagGroup dialogItemsSpec;
        TagGroup dialogSpec = DLGCreateDialog(banner, dialogItemsSpec);

        // Create and add the content box and text field to the layout
        TagGroup contentBoxItemsSpec;
        TagGroup contentBoxSpec = DLGCreateBox(contentBoxItemsSpec);
        TagGroup contentLabelSpec = DLGCreateLabel(message);
        contentBoxItemsSpec.DLGAddElement(contentLabelSpec);
        dialogItemsSpec.DLGAddElement(contentBoxSpec);

        // If the DM app window has been minimized, 
        // this modal dialog will be invisible,
        // but it will still inhibit further user action
        // within DM as it awaits 'esc' or 'enter'.

        // The following is a remedy that works in GMS1, but not in GMS2
        // GetApplicationWindow().WindowSelect();

        // For GMS2, we can use an executable that restores the DM app window.
        // The lines below launch RestoreDM.exe, placed in C:\ProgramData\Gatan,
        // where RestoreDM is an executable of the following AutoHotKey script:
        // IfWinNotActive, Digital Micrograph
        //      WinRestore, Digital Micrograph
        String commandDir = GetApplicationDirectory(3, 0);
        String restoreCommand = commandDir.PathConcatenate("RestoreDM");
        LaunchExternalProcessAsync(restoreCommand);
        Sleep(0.1);

        Object dialog = Alloc(UIFrame).Init(dialogSpec);
        String result = (dialog.Pose()) ? "OK" : "Cancel";
        OKDialog(result);
    }
}

void main()
{
    Alloc(DeferredAlertTask);
}

main();

必须使用异步变体LaunchExternalProcessAsync（），因为在主线程上调用了延迟警报任务，因此当RestoreDM程序提示时（导致DM挂起），阻止DM还原其窗口。还要注意的是，在调用外部程序之后需要短暂的睡眠，以确保在创建自定义对话框之前恢复DM应用程序窗口。