BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  OnDeviceChange Problem Goto page 1, 2  Next          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Uri Guest Posted: Tue Oct 17, 2006 5:57 pm    Post subject: OnDeviceChange Problem Hi, when I connect OR disconnect the USB connector I reach the breakpoint in function "OnDeviceChange", but the parameters of 'm' are stay the same (it is not right), why? Thanks. public: // User declarations __fastcall TUSBApp_form(TComponent* Owner); // Overriding a message handle //Messages::TMessage message; void OnDeviceChange(Messages::TMessage ); BEGIN_MESSAGE_MAP MESSAGE_HANDLER(WM_DEVICECHANGE , Messages::TMessage , OnDeviceChange) END_MESSAGE_MAP(TComponent) //--------------------------------------------------------------- void TUSBApp_form::OnDeviceChange(Messages::TMessage m) { //USBC->OnDeviceChange(m); return; // Breakpoint Here } Back to top Michel Leunen Guest Posted: Tue Oct 17, 2006 7:38 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: Hi, when I connect OR disconnect the USB connector I reach the breakpoint in function "OnDeviceChange", but the parameters of 'm' are stay the same (it is not right), why? void TUSBApp_form::OnDeviceChange(Messages::TMessage m) You have to test against m.WParam. Something like: switch(m.WParam) { case DBT_DEVICEARRIVAL: //a new device has been inserted break; case DBT_DEVICEREMOVECOMPLETE: //a device has been removed break; } Michel -- ---------------------------------------- Michel Leunen mailto: see my homepage. C++Builder, BCC5.5.1 Web site: http://www.leunen.com/ ---------------------------------------- Back to top Uri Guest Posted: Tue Oct 17, 2006 7:45 pm    Post subject: Re: OnDeviceChange Problem I tried that, it's not working, every time when the function is call (when I connect or remove the USB device from the PC) the parameter 'm.WParam' stay 7 (m.WParam = 7) Why does it not chaning? Uri. Quote: You have to test against m.WParam. Something like: switch(m.WParam) { case DBT_DEVICEARRIVAL: //a new device has been inserted break; case DBT_DEVICEREMOVECOMPLETE: //a device has been removed break; } Michel Back to top Bob Gonder Guest Posted: Tue Oct 17, 2006 9:08 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: I tried that, it's not working, every time when the function is call (when I connect or remove the USB device from the PC) the parameter 'm.WParam' stay 7 (m.WParam = 7) Why does it not chaning? Look in DBT.H 7 is DBT_DEVNODES_CHANGED which you should be ignoring as Michel pointed out. Quote: switch(m.WParam) { case DBT_DEVICEARRIVAL: //a new device has been inserted break; case DBT_DEVICEREMOVECOMPLETE: //a device has been removed break; } Michel Just a thought: It could be that the mystery device you are unplugging isn't supposed to report device arrival/removed. You might ask the manufacturer. Back to top Michel Leunen Guest Posted: Tue Oct 17, 2006 9:12 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: I tried that, it's not working, every time when the function is call (when I connect or remove the USB device from the PC) the parameter 'm.WParam' stay 7 (m.WParam = 7) Why does it not chaning? That's a DBT_DEVNODES_CHANGED. According to MSDN : "The system broadcasts the DBT_DEVNODES_CHANGED device event when a device has been added to or removed from the system." It seems there is no way to know if the device has been added or removed from the system. Michel -- ---------------------------------------- Michel Leunen mailto: see my homepage. C++Builder, BCC5.5.1 Web site: http://www.leunen.com/ ---------------------------------------- Back to top Remy Lebeau (TeamB) Guest Posted: Tue Oct 17, 2006 10:04 pm    Post subject: Re: OnDeviceChange Problem "Uri" <Uri (AT) MyMail (DOT) com> wrote in message news:4534d31d$1 (AT) newsgroups (DOT) borland.com... Quote: void OnDeviceChange(Messages::TMessage ); Just an FYI, in a message map, you need to pass TMessage by reference, not by value, just like when overriding WndProc(): void __fastcall OnDeviceChange(Messages::TMessage &); Gambit Back to top Uri Guest Posted: Wed Oct 18, 2006 5:41 pm    Post subject: Re: OnDeviceChange Problem No, it's not working either.... when I insert or remove my USB device the 'WMDiskChange' function is call several times but at each call I see in the debuger that Message.WParam = 7, when I insert, or when I remove the USB connector of the device. Any idea why? can it be a problem in the device itself? Here is my last code - void __fastcall WMDiskChange( TMessage &Message ); BEGIN_MESSAGE_MAP MESSAGE_HANDLER( WM_DEVICECHANGE, TMessage, WMDiskChange ) END_MESSAGE_MAP( TControl ) void __fastcall TForm1::WMDiskChange( TMessage &Message ) { int Value; Value = Message.WParam; Value = Value; // I set my breakpoint here } Quote: Just an FYI, in a message map, you need to pass TMessage by reference, not by value, just like when overriding WndProc(): void __fastcall OnDeviceChange(Messages::TMessage &); Gambit Back to top Uri Guest Posted: Wed Oct 18, 2006 5:48 pm    Post subject: Re: OnDeviceChange Problem Quote: Just a thought: It could be that the mystery device you are unplugging isn't supposed to report device arrival/removed. You might ask the manufacturer. How can the device send 'removed' report when I remove it? I mean, when I remove it, I disconnect the USB cable, so the device can't send anything becouse the cable is not connected any more to the PC..... am I wrong? Uri. Back to top Michel Leunen Guest Posted: Wed Oct 18, 2006 6:14 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: No, it's not working either.... Have a look at RegisterDeviceNotification() in MSDN. It seems to be the correct way to do what you want. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/registering_for_device_notification.asp or http://tinyurl.com/w9h6w Michel -- ---------------------------------------- Michel Leunen mailto: see my homepage. C++Builder, BCC5.5.1 Web site: http://www.leunen.com/ ---------------------------------------- Back to top Uri Guest Posted: Wed Oct 18, 2006 6:44 pm    Post subject: Re: OnDeviceChange Problem Quote: Have a look at RegisterDeviceNotification() in MSDN. It seems to be the correct way to do what you want. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/registering_for_device_notification.asp or http://tinyurl.com/w9h6w Michel Hi, I did not understand how to use it... from where do I call to this function? what is the 'GUID InterfaceClassGuid' parameter from where do I take it? Where exactly 'hWnd' get it's value? Where do I find the defenition of DEV_BROADCAST_DEVICEINTERFACE ? Which paarmeter shows me if the device was Inserted or Removed ? Thanks. Back to top Uri Guest Posted: Wed Oct 18, 2006 7:20 pm    Post subject: Re: OnDeviceChange Problem I tried the following, 'NotificationFilter' data looks exactly the same for 'Insert' or 'Remove'. also, I did not know from where to take 'NotificationFilter.dbcc_classguid' data. Thanks. void __fastcall TForm1::WMDiskChange( TMessage &Message ) { DEV_BROADCAST_DEVICEINTERFACE NotificationFilter; char szMsg[80]; ZeroMemory( &NotificationFilter, sizeof( NotificationFilter ) ); NotificationFilter.dbcc_size = sizeof( DEV_BROADCAST_DEVICEINTERFACE ); NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; //NotificationFilter.dbcc_classguid = InterfaceClassGuid; // ? ? ? ? ? RegisterDeviceNotification( Application->Handle, &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE ); } Back to top Michel Leunen Guest Posted: Wed Oct 18, 2006 8:08 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: Hi, I did not understand how to use it. Sorry, I don't know either. I just did a search on MSDN and they mention that function in their article about Device Events. That's all I know about it. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/device_events.asp Michel -- ---------------------------------------- Michel Leunen mailto: see my homepage. C++Builder, BCC5.5.1 Web site: http://www.leunen.com/ ---------------------------------------- Back to top Michel Leunen Guest Posted: Wed Oct 18, 2006 8:15 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: what is the 'GUID InterfaceClassGuid' parameter from where do I take it? Seems you can found it here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devinst_d/hh/DevInst_d/setup-cls_f7544122-69a3-4b34-85f5-db3714408026.xml.asp Quote: Where exactly 'hWnd' get it's value? That's the handle of *your* window receiving notification. Michel -- ---------------------------------------- Michel Leunen mailto: see my homepage. C++Builder, BCC5.5.1 Web site: http://www.leunen.com/ ---------------------------------------- Back to top Remy Lebeau (TeamB) Guest Posted: Wed Oct 18, 2006 9:45 pm    Post subject: Re: OnDeviceChange Problem "Uri" <Uri (AT) nomail (DOT) com> wrote in message news:453622af$1 (AT) newsgroups (DOT) borland.com... Quote: How can the device send 'removed' report when I remove it? I mean, when I remove it, I disconnect the USB cable, so the device can't send anything becouse the cable is not connected any more to the PC..... am I wrong? The device itself is not the one sending the notifications. The OS is, in response to the device driver reporting that the device is attached/detached. Gambit Back to top Michel Leunen Guest Posted: Wed Oct 18, 2006 10:46 pm    Post subject: Re: OnDeviceChange Problem Uri wrote: Quote: Hi, I did not understand how to use it. Ok, I tried with my usb key and it works. RegisterDeviceNotification() tells the OS to send to your app the notification messages you want. Without this as you've noted, you don't receive the arrival or removal of your device. First add this to your form constructor: DEV_BROADCAST_DEVICEINTERFACE NotificationFilter = {0}; NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE); NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; NotificationFilter.dbcc_classguid = GUID_DEVCLASS_USB; RegisterDeviceNotification(Handle, &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE); And then in your message handler (WndProc or whatever): if(Message.Msg == WM_DEVICECHANGE) { switch(Message.WParam) { case DBT_DEVICEARRIVAL: Application->MessageBox("Arrival","USB",MB_OK); break; case DBT_DEVICEREMOVECOMPLETE: Application->MessageBox("Removal","USB",MB_OK); break; } } Don't know if it works for any USB devices but at least it works for my usb key. HTH Michel -- ---------------------------------------- Michel Leunen mailto: see my homepage. 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