Tweet
As many of you know, for months now I have been researching USB and how it works, what it takes to communicate, and if communicating with the correct device.
On top of trying to make it "Simple" for someone else to follow. (good luck there
)
Anyways, I am hoping someone can clear my head and point out what I am doing wrong? (Even if its just a generic DeviceIoControl on a plain text file? (please no more examples about scuzzy drives, hard drives etc..) As I am trying to get my head wrapped around the "Kindergarten" phase of generic concepts.)
Where I am stuck is getting a Descriptor, so I can learn about the device I am looking at. (Yes I know this is easily done on Device attach/Detach etc...but I am looking at if my program runs after the device is attached, and determine if it is the one that I need to talk to)
Anyways, Sample Code below, and real code I hope to post soon.
(Real code currently returns either invalid handle, incorrect parameter, or does not support) but if I can get just 1 known device to work correctly then I am sure I can figure out why or why not the others do or don't
Any help you can give will be GREATLY appreciated
On top of trying to make it "Simple" for someone else to follow. (good luck there
)Anyways, I am hoping someone can clear my head and point out what I am doing wrong? (Even if its just a generic DeviceIoControl on a plain text file? (please no more examples about scuzzy drives, hard drives etc..) As I am trying to get my head wrapped around the "Kindergarten" phase of generic concepts.)
Where I am stuck is getting a Descriptor, so I can learn about the device I am looking at. (Yes I know this is easily done on Device attach/Detach etc...but I am looking at if my program runs after the device is attached, and determine if it is the one that I need to talk to)
Anyways, Sample Code below, and real code I hope to post soon.
(Real code currently returns either invalid handle, incorrect parameter, or does not support) but if I can get just 1 known device to work correctly then I am sure I can figure out why or why not the others do or don't
Any help you can give will be GREATLY appreciated
Code:
#COMPILE EXE
#DIM ALL
#INCLUDE "WIN32API.INC" 'Define Windows OS variables and functions
'*** Got from Docs but may be wrong
%BMREQUEST_STANDARD = 0
%BMREQUEST_TO_DEVICE = 0
%USB_DEVICE_DESCRIPTOR_TYPE = &H01
TYPE USB_SETUP_PACKET
bmRequest AS BYTE
bRequest AS BYTE
wValue AS WORD
wIndex AS WORD
wLength AS WORD
END TYPE
TYPE USB_DESCRIPTOR_REQUEST
ConnectionIndex AS DWORD
SetupPacket AS USB_SETUP_PACKET
END TYPE
%USB_REQUEST_GET_DESCRIPTOR = &H06
TYPE USB_DEVICE_DESCRIPTOR
bLength AS BYTE
bDescriptorType AS BYTE
bcdUSB AS WORD
bDeviceClass AS BYTE
bDeviceSubClass AS BYTE
bDeviceProtocol AS BYTE
bMaxPacketSize0 AS BYTE
idVendor AS WORD
idProduct AS WORD
bcdDevice AS WORD
iManufacturer AS BYTE
iProduct AS BYTE
iSerialNumber AS BYTE
bNumConfigurations AS BYTE
END TYPE
FUNCTION PBMAIN () AS LONG
LOCAL ErrFunc AS DWORD
LOCAL ErrorBuff AS ASCIIZ * %MAX_PATH
'*** DeviceIoControl Parameters
LOCAL DevHndl AS DWORD 'handle to device of interest
LOCAL dwIoControlCode AS DWORD 'control code of operation to perform
' LPVOID lpInBuffer, // pointer to buffer to supply input data
LOCAL lpInBuffer AS USB_DESCRIPTOR_REQUEST
LOCAL nInBufferSize AS DWORD 'size of input buffer
' LPVOID lpOutBuffer, // pointer to buffer to receive output data
LOCAL lpOutBuffer AS USB_DEVICE_DESCRIPTOR
LOCAL nOutBufferSize AS DWORD 'size of output buffer
' LPDWORD lpBytesReturned, // pointer to variable to receive output byte count
LOCAL lpBytesReturned AS DWORD
LOCAL OverlappedType AS Overlapped 'pointer to overlapped structure for asynchronous operation
' ErrFunc = CreateFile("COM1", %GENERIC_READ OR %GENERIC_WRITE, 0, BYVAL 0, %OPEN_EXISTING, %FILE_FLAG_OVERLAPPED, %NULL) 'Windows Friendly Name
DevHndl = CreateFile("\\?\acpi#pnp0501#1#{86e0d1e0-8089-11d0-9ce4-08003e301f73}", %GENERIC_READ OR %GENERIC_WRITE, 0, BYVAL 0, %OPEN_EXISTING, %FILE_FLAG_OVERLAPPED, %NULL) 'Windows REAL Name
'*********************************** ERROR CHECKING **************************************
ErrFunc = GetLastError() 'Check for the error
FormatMessage %FORMAT_MESSAGE_FROM_SYSTEM, BYVAL %NULL, ErrFunc, %NULL, ErrorBuff, SIZEOF(ErrorBuff), BYVAL %NULL 'Format the message
MSGBOX STR$(ErrFunc) + $TAB + ErrorBuff
'******************************** END ERROR CHECKING *************************************
DevHndl = CloseHandle(DevHndl) 'Close Handle whether its valid or not '<--- Not sure if this does anything on a invalid handle?
'*********************************** ERROR CHECKING **************************************
ErrFunc = GetLastError() 'Check for the error
FormatMessage %FORMAT_MESSAGE_FROM_SYSTEM, BYVAL %NULL, ErrFunc, %NULL, ErrorBuff, SIZEOF(ErrorBuff), BYVAL %NULL 'Format the message
MSGBOX STR$(ErrFunc) + $TAB + ErrorBuff
'******************************** END ERROR CHECKING *************************************
' OverLappedType.Offset = 0
' OverLappedType.OffsetHigh = 0
' OverLappedType.hEvent = 0
lpInBuffer.ConnectionIndex = 1 '<--- Tried 0 (like I think it should be but tried 1 just in case)
lpInBuffer.SetupPacket.bmRequest = %BMREQUEST_STANDARD '<--- Not sure if correct, but tried for getting 1st peice of info
lpInBuffer.SetupPacket.bRequest = %USB_REQUEST_GET_DESCRIPTOR '<--- Not sure if correct, but tried for getting 1st peice of info
lpInBuffer.SetupPacket.wValue = %USB_DEVICE_DESCRIPTOR_TYPE '<--- Not sure if correct, but tried for getting 1st peice of info
lpInBuffer.SetupPacket.wIndex = 0 '<--- Not sure if correct, but tried for getting 1st peice of info
lpInBuffer.SetupPacket.wLength = SIZEOF(lpInBuffer.SetupPacket) '<--- Not sure if correct, but tried for getting 1st peice of info
'*** Fill in info to be gotten
dwIoControlCode = %USB_REQUEST_GET_DESCRIPTOR
nInBufferSize = SIZEOF(lpInBuffer)
nOutBufferSize = SIZEOF(lpOutBuffer)
' ErrFunc = DeviceIoControl(hDevice, dwIoControlCode, lpInBuffer, nInBufferSize, lpOutBuffer, nOutBufferSize, lpBytesReturned, OverlappedType)
IF DevHndl <> %INVALID_HANDLE_VALUE THEN
ErrFunc = DeviceIoControl(DevHndl, dwIoControlCode, lpInBuffer, nInBufferSize, lpOutBuffer, nOutBufferSize, lpBytesReturned, BYVAL %NULL)
END IF
'*********************************** ERROR CHECKING **************************************
ErrFunc = GetLastError() 'Check for the error
FormatMessage %FORMAT_MESSAGE_FROM_SYSTEM, BYVAL %NULL, ErrFunc, %NULL, ErrorBuff, SIZEOF(ErrorBuff), BYVAL %NULL 'Format the message
MSGBOX "Get Descriptor = " + STR$(ErrFunc) + $TAB + ErrorBuff
'******************************** END ERROR CHECKING *************************************
END FUNCTION
with error codes like that. What parameter? is it a part of SetupPacket? Index? Message Requested? a type pointed at another type? etc.....)
) but in some areas, you seem to be "Leap Years ahead of me" 
Comment