UsbQueryDeviceReport: Difference between revisions
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Obtains the Compound Descriptor of a specific USB device. | Obtains the Compound Descriptor of a specific USB device. | ||
==Syntax== | ==Syntax== | ||
''For | ''For access by Device Handle use:'' | ||
<pre> | <pre> | ||
ulrc = UsbQueryDeviceReport(Handle,pulBufLen,pucData) | ulrc = UsbQueryDeviceReport(Handle,pulBufLen,pucData) | ||
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==Parameters== | ==Parameters== | ||
; Handle : the Device Handle received from the previous UsbOpen. | ; Handle : the Device Handle received from the previous UsbOpen. | ||
; ulDevNumber : the Device Number from 1 up to the Total Number from UsbQueryNumberDevices. | ; ulDevNumber : the Device Number from 1 up to the Total Number from UsbQueryNumberDevices. | ||
; pulBufLen : the address of the variable to specify/receive the number of bytes. | ; pulBufLen : the address of the variable to specify/receive the number of bytes. | ||
; pucData : the address of the buffer to receive the Compound Descriptor. | ; pucData : the address of the buffer to receive the Compound Descriptor. | ||
==Return Code== | ==Return Code== | ||
0x0000 - NO_ERROR | |||
0x0000 - NO_ERROR | |||
;Errors | |||
<pre> | <pre> | ||
0x0057 - ERROR_INVALID_PARAMETER | 0x0057 - ERROR_INVALID_PARAMETER | ||
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0xFFEA - ERROR_MORE_DATA | 0xFFEA - ERROR_MORE_DATA | ||
</pre> | </pre> | ||
==Remarks== | ==Remarks== | ||
The Compound Descriptor is the concatenation of Device Descriptor and Configuration Descriptor. | The Compound Descriptor is the concatenation of Device Descriptor and Configuration Descriptor. | ||
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} | } | ||
} | } | ||
</pre> | </pre> | ||
Revision as of 09:20, 5 March 2018
Obtains the Compound Descriptor of a specific USB device.
Syntax
For access by Device Handle use:
ulrc = UsbQueryDeviceReport(Handle,pulBufLen,pucData)
For acces by Device Number:
ulrc = UsbQueryDeviceReport(ulDevNumber,pulBufLen,pucData)
Parameters
- Handle
- the Device Handle received from the previous UsbOpen.
- ulDevNumber
- the Device Number from 1 up to the Total Number from UsbQueryNumberDevices.
- pulBufLen
- the address of the variable to specify/receive the number of bytes.
- pucData
- the address of the buffer to receive the Compound Descriptor.
Return Code
0x0000 - NO_ERROR
- Errors
0x0057 - ERROR_INVALID_PARAMETER 0x1B58 - USB_NOT_INIT 0xFF13 - ERROR_I24_INVALID_PARAMETER 0xFF1F - ERROR_GEN_FAILURE 0xFF37 - ERROR_DEV_NOT_EXIST 0xFF57 - ERROR_INVALID_PARAMETER 0xFF6F - ERROR_BUFFER_OVERFLOW 0xFFEA - ERROR_MORE_DATA
Remarks
The Compound Descriptor is the concatenation of Device Descriptor and Configuration Descriptor.
Example Code
//Code Snippet - UsbQueryDeviceReport
{
APIRET ulrc;
PUCHAR pucReport;
PULONG pulBufLen;
UCHAR ucReport[4096];
ULONG ulBufLen = sizeof(ucReport);
ULONG ulDevNumber = ulNumDev;
pucReport = &ucReport[0];
pulBufLen = &ulBufLen;
ulrc = UsbQueryDeviceReport(ulDevNumber,pulBufLen,pucReport);
printf("\nUsbQueryDeviceReport - ulrc: 0x%04X (%hu)",ulrc,ulrc);
if (!ulrc) //success
{
int i; printf(" - DeviceReport:\n");
for (i=0;i<ulBufLen;i++) printf("%02X",ucReport[i]);
}
}