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You may come across an error code indicating a system error. Code 1400. Invalid window handle. It turns out there are several steps you can take to fix this problem, and that’s exactly what we’re going to do now.
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g.Windows CSP reported error: Invalid window handle. Error code: 1400 Although we investigated the complication further, we did not find any underlying causes or similarities, such as a specific document reporting the issue.
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You have a lot of code, but no key for the corresponding part. Specifically, some of the xOnAsyncRequestDone implementations of your event handler / method (unless it literally calls the log plan you posted).
This method works in the context of the tmysynhttpasync thread, and depending on the behavior you are describing – in particular, the fact that Synchronize will solve your problem – there is a high probability that the Activity in this event handler creates a handle to the window.
This doorknob then belongs to the asynchronous HTTP thread, the main line of the application (sometimes called the “VCL thread”) that should otherwise launch your application. When your application exits, the VCL features do some final processing, destroying objects and the window, etc. If one of thesex windows has been carefully crafted by others, this will cause problems.
Windows considers a strict human ownership of a stream in the sense that it was created. You cannot create a window by working together on one thread and then destroying it on another.
Note that VCL window handles can often be generated indirectly. You will not necessarily see an explicit reference to create a control that marks the underlying window handle associated with its creation. Window handles are often created when needed. Likewise, changing resistance properties can cause the VCL to try to recreate the window for that control, messing up the current window in the process.
It should be pretty obvious that these mechanisms are very susceptible to problems that can arise when calling VCL methods from publications other than the VCL stream. This is why it is often said here that “the VCL is not very thread safe”.
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The safest way is to manipulate VCL objects from code that only runs on the VCL thread itself.
Synchronize With Rescue
The Mechanism You Call With Synchronize Actually Works To Ensure That The Type Of The Method Being Synchronized Is Executed With A Reference To The VCL Thread. If This Is Likely To Actually Create A Window Handle, And When The Last VCL Thread Appears, That Window Handle Is Destroyed, It Can Indeed Be Done Because It Will Actually Create It. Options
However, the
Other Synchronize Devices Are Quite Complex As They (today), Among Other Things, Have Cross-platform Issues And Therefore Might Be Overkill In This Case.
If Your Windows Code Is Correct, A Possible Solution To This Problem Might Be To Use One Of Our Facts That Windows Allows Threads To Send (or Post) Messages To Windows On Various Other Threads. If Messages Received By These Windows Are Used By That Window’s Own Thread, Only If All Other Messages Sent To Those Windows Are Clear. That Is, You Cannot End Up Interrupting The “click” Message Received By This Window Frame Suddenly Leap To Perform Any Notification From The Thread. This Notification Should Simply Wait For The Rotation Until The Window Has Finished Processing This Simple Click Message. For Example.
You Can Imagine That This Is The “Synchronization” System, Which Is “built Into The Operating System.”
So, During Initialization, You Can Pass A Window Handle To A Contact Form (or A Control Or Whatever With A Panel Handle) Into Your Asynchronous HTTP Stream To Identify The VCL Window That Is Hoping As A “request”. Done “. Or A Lot Of Notifications From A Pipe. Careful People Can Then Use The PostMessage Or SendMessage Descriptor To Send Notifications To This Jar, Which Someone Can Handle By Overwriting WindowProc In A Form Or Using A So-called Message Handler.
When A Thread Uses SendMessage () To Send A Notification, It Quickly Pauses And Has To Wait For The Entire Message To Be Received From Its Window (on The VCL Thread) And Processed.
If The Stream Is PostMessage () , The Message Is Aligned Asynchronously, Andthe Thread Can Continue Executing Other Jobs Without Waiting. Finally, The VCL Fetches The Message And Processes It.
NO Recommendations
This does not mean that I would probably recommend this alternative in this case. While this may seem appropriate in this case, since this is a simple “work in progress” message, it is impossible to tell which one would be more appropriate without a fuller understanding of your specific needs.
I’m only mentioning this to highlight the fact that alternatives exist, and the key to safe and reliable streaming is likely to be understanding the principles and techniques used.
Speed up your computer today with this simple download.Systeemfout. Code 1400. Ongeldige Raamgreep
Systemfel. Kod 1400. Ogiltigt Fönsterhandtag
Системная ошибка. Код 1400. Недопустимая оконная ручка.
Systemfehler. Code 1400. Ungültiger Fenster-Handle
Erro No Sistema. Código 1400. Identificador De Janela Inválido
Erreur Système. Code 1400. Poignée De Fenêtre Non Valide
Errore Di Sistema. Codice 1400. Maniglia Per Finestra Non Valida
Błąd Systemu. Kod 1400. Nieprawidłowa Klamka Okienna
시스템 오류. 코드 1400. 잘못된 창 핸들
Error Del Sistema. Código 1400. Tirador De Ventana No Válido
