After the windows system wakes up from the sleep state, the application cannot continue to download

Question

The application is in the process of downloading (using HttpClient). At this time, I hibernate the windows system and then wake up the system, but the application cannot continue to download (it is in Established). How can I continue to reuse the connection to continue downloading, or I need to recreate the httpclient object.

Answer 1

Hi, welcome to Microsoft Q&A.

Maybe you need to detect system wakeups to recreate downloads, or prevent the system from going to sleep.

Based on System Wake-up Events, when the system automatically wakes up, it broadcasts the PBT_APMRESUMEAUTOMATIC event to all applications.

A window receives PBT_APMRESUMEAUTOMATIC event through the WM_POWERBROADCAST message.

You can determine whether the system is awakened by detecting the WM_POWERBROADCAST message.

The code reference is as follows:

        private const int POWERBROADCAST = 0x0218;

        protected override void WndProc(ref Message m) {
            switch (m.Msg) {

                case POWERBROADCAST:

                    if (m.Msg==18)

                        //recreate the httpclient object or doing something else.

                        this.Invalidate();

                    break;
            }
        }

Best Regards.

Jiachen Li

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