Windows USB example

[pavanbarot]

Thanks a lot it's works fine....

[gavagai]

ok, it works but I think it is not exactly correct.
Your image shows a generic class GUID for all USB devices (##?# USB VID # ...).
Better to use a GUID for a specific class of devices.
Search again to find something like # #? # IMAGE # VID_XXXX&PID_XXXX and uses its GUID.
Maybe I'm wrong, but I think for read / write operations you must use a more specific GUID.

[purnima]

I am new member to this forum. So this information is useful for me. I will try this.

[caodungviet]

sorry but i don't understand about The "Device Class GUID", please you help me?? for example,
#define HID_CLASSGUID {0x6bdd1fc6, 0x810f, 0x11d0,{ 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f }}
so :{ 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f }.what is it??
please explain for me,i don't understand about it. what it means?? sorry ,because my english is not good

[squidge]

They are device class GUIDs used in device detection and classification. See the Windows DDK for more information and other GUIDs.

[kuzulis]

Hi all.
And why different descriptors for reading and writing device?
(You can also open once a one descriptor for reading and writing!)

[squidge]

Hi all.
And why different descriptors for reading and writing device?
(You can also open once a one descriptor for reading and writing!)

You can but that will not work across all devices. Some devices for example are read-only, so if you try to open them as read/write the call will fail, but if you have seperate read and write only the write will fail, so you know the device is read-only and don't need to do additional work (such as reopening as read only and setting a read-only flag). Typically however you will know this before writing code but as an example it is impossible to know this in advance.

[kuzulis]

aah, I understand, thank you.

[caodungviet]

i can conect with USB, but when i open it ,so my computer is broke dow,, why such that??

[squidge]

Please rephrase. Don't understand.

[caodungviet]

sorry, because my english is not good..i can connect this project with USB,but when i open this project ,my computer can't run.
please help me!!

[wysota]

You mean it reboots?