disable or enable a hardware

[elsc]

disable for sometime and need to enable it in sometime too

i can open the device manager and disable it, so it must have the way to do in vb right?

is there any better idea other than remove the hardware?

[Al42]

i can open the device manager and disable it, so it must have the way to do in vb right?

Not necessarily. There are many things you just can't code in VB. Does your program need the ability to disable and re-enable the hardware while it runs? Or do you just want the hardware not enabled when your program is running? What is the hardware? Some kinds can be turned on and off from software easily.

[AngeloGomes]

Reopening this thread as no response has solved the issue.

Well, I've been working with a serial (RS232) connection and facing denied access to the communication port while debugging the code in the IDE. This issue is caused by a problem in the code that fails to close the COM port before stopping. As a temporary solution, I've had to close the IDE in order to release the COM port.

I was considering that once the error code is captured, I could disable/remove the serial port and then enable/reinstall it again. By doing so, the need to close the IDE would no longer be necessary.

So, how to perform this task through code ?

[fafalone]

If it can be disabled via device manager it can indeed be disabled by code... however some brief research on this topic suggests it is not possible on a 64bit machine through the WOW64 layer (i.e. from a 32bit app). You *could* get around this by calling the 64bit DLLs, but it's very, very difficult. Another option would be twinBASIC, which wasn't around in 2006 when this question was asked.

Here's an example of how to do it in C#: https://stackoverflow.com/questions/...disable-device

And here's the relevant APIs you'd need in 64bit VBA/twinBASIC:

Public Enum Setup_DIGCF
    DIGCF_DEFAULT  = &H00000001  ' only valid with DIGCF_DEVICEINTERFACE
    DIGCF_PRESENT  = &H00000002
    DIGCF_ALLCLASSES  = &H00000004
    DIGCF_PROFILE  = &H00000008
    DIGCF_DEVICEINTERFACE  = &H00000010
End Enum

Public Type SP_DEVINFO_DATA
    cbSize As Long
    ClassGuid As UUID
    DevInst As Long
    Reserved As LongPtr
End Type

Public Enum Setup_DICSF
    DICS_FLAG_GLOBAL  = &H00000001  ' make change in all hardware profiles
    DICS_FLAG_CONFIGSPECIFIC  = &H00000002  ' make change in specified profile only
    DICS_FLAG_CONFIGGENERAL  = &H00000004  ' 1 or more hardware profile-specific
'  changes to follow.
End Enum


Public Enum DI_FUNCTION
    DIF_SELECTDEVICE  = &H00000001
    DIF_INSTALLDEVICE  = &H00000002
    DIF_ASSIGNRESOURCES  = &H00000003
    DIF_PROPERTIES  = &H00000004
    DIF_REMOVE  = &H00000005
    DIF_FIRSTTIMESETUP  = &H00000006
    DIF_FOUNDDEVICE  = &H00000007
    DIF_SELECTCLASSDRIVERS  = &H00000008
    DIF_VALIDATECLASSDRIVERS  = &H00000009
    DIF_INSTALLCLASSDRIVERS  = &H0000000A
    DIF_CALCDISKSPACE = &H0000000B
    DIF_DESTROYPRIVATEDATA  = &H0000000C
    DIF_VALIDATEDRIVER  = &H0000000D
    DIF_MOVEDEVICE = &H0000000E
    DIF_DETECT  = &H0000000F
    DIF_INSTALLWIZARD  = &H00000010
    DIF_DESTROYWIZARDDATA  = &H00000011
    DIF_PROPERTYCHANGE  = &H00000012
    DIF_ENABLECLASS  = &H00000013
    DIF_DETECTVERIFY  = &H00000014
    DIF_INSTALLDEVICEFILES  = &H00000015
    DIF_UNREMOVE  = &H00000016
    DIF_SELECTBESTCOMPATDRV  = &H00000017
    DIF_ALLOW_INSTALL  = &H00000018
    DIF_REGISTERDEVICE  = &H00000019
    DIF_NEWDEVICEWIZARD_PRESELECT  = &H0000001A
    DIF_NEWDEVICEWIZARD_SELECT  = &H0000001B
    DIF_NEWDEVICEWIZARD_PREANALYZE  = &H0000001C
    DIF_NEWDEVICEWIZARD_POSTANALYZE  = &H0000001D
    DIF_NEWDEVICEWIZARD_FINISHINSTALL  = &H0000001E
    DIF_UNUSED1  = &H0000001F
    DIF_INSTALLINTERFACES  = &H00000020
    DIF_DETECTCANCEL  = &H00000021
    DIF_REGISTER_COINSTALLERS  = &H00000022
    DIF_ADDPROPERTYPAGE_ADVANCED  = &H00000023
    DIF_ADDPROPERTYPAGE_BASIC  = &H00000024
    DIF_RESERVED1  = &H00000025
    DIF_TROUBLESHOOTER  = &H00000026
    DIF_POWERMESSAGEWAKE  = &H00000027
    DIF_ADDREMOTEPROPERTYPAGE_ADVANCED  = &H00000028
    DIF_UPDATEDRIVER_UI  = &H00000029
    DIF_FINISHINSTALL_ACTION  = &H0000002A
    DIF_RESERVED2  = &H00000030
End Enum

Public Type SP_CLASSINSTALL_HEADER
    cbSize As Long
    InstallFunction As DI_FUNCTION
End Type

Public Enum SetupDeviceStateChange
    DICS_ENABLE  = &H00000001
    DICS_DISABLE  = &H00000002
    DICS_PROPCHANGE  = &H00000003
    DICS_START  = &H00000004
    DICS_STOP  = &H00000005
End Enum

Public Type SP_PROPCHANGE_PARAMS
    ClassInstallHeader As SP_CLASSINSTALL_HEADER
    StateChange As SetupDeviceStateChange
    Scope As Setup_DICSF
    HwProfile As Long
End Type


Public DeclareWide PtrSafe Function SetupDiGetClassDevsW Lib "setupapi" (ClassGuid As UUID, ByVal Enumerator As String, ByVal hWndParent As LongPtr, ByVal Flags As Setup_DIGCF) As LongPtr
Public DeclareWide PtrSafe Function SetupDiEnumDeviceInfo Lib "setupapi" (ByVal DeviceInfoSet As LongPtr, ByVal MemberIndex As Long, ByRef DeviceInfoData As SP_DEVINFO_DATA) As BOOL
Public DeclareWide PtrSafe Function SetupDiDestroyDeviceInfoList Lib "setupapi" (ByVal DeviceInfoSet As LongPtr) As BOOL
Public DeclareWide PtrSafe Function SetupDiGetDeviceInstanceIdW Lib "setupapi" (ByVal DeviceInfoSet As LongPtr, DeviceInfoData As SP_DEVINFO_DATA, ByVal DeviceInstanceId As LongPtr, ByVal DeviceInstanceSize As Long, RequiredSize As Long) As BOOL
Public DeclareWide PtrSafe Function SetupDiSetClassInstallParamsW Lib "setupapi" (ByVal DeviceInfoSet As LongPtr, DeviceInfoData As SP_DEVINFO_DATA, ClassInstallParams As Any, ByVal ClassInstallParamsSize As Long) As BOOL