How to get hardware id of the usb device using device id...i am using vc++6.0 and OS is xp.
is it possible by using wmi.
Finally i solved my problem...thanks for your replies...
I am posting the code here, it may be useful for someone... by this code we can get all hardwareids of the devices which are connceted to our system..
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(NULL,
0, // Enumerator
0,
DIGCF_PRESENT | DIGCF_ALLCLASSES );
if (hDevInfo == INVALID_HANDLE_VALUE)
{
//Error handling here.
printf("Error Details:[%s]\n","INVALID_HANDLE_VALUE");
return 1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
LPTSTR hwbuffer=NULL;
DWORD buffersize = 0;
//
// Call function with null to begin with,
// then use the returned buffer size (doubled)
// to Alloc the buffer. Keep calling until
// success or an unknown failure.
//
// Double the returned buffersize to correct
// for underlying legacy CM functions that
// return an incorrect buffersize value on
// DBCS/MBCS systems.
//
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_HARDWAREID,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() ==
ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = (char*)LocalAlloc(LPTR,buffersize * 2);
}
else
{
//Error handling here.
//printf("Error Details:[%s]\n",GetLastError());
break;
}
}
printf("Test Result:[%s]\n",buffer);
if (buffer) LocalFree(buffer);
}
if ( GetLastError()!=NO_ERROR &&
GetLastError()!=ERROR_NO_MORE_ITEMS )
{
// Error handling here.
printf("Error Details:[%s]\n",GetLastError());
return 1;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
return 0;
You might be somewhat confused because you assume the hardware ID. IoGetDeviceProperty(yourDevice, DevicePropertyHardwareID, ...) returns a list.
Related
i'm developing on a Bluetooth Low Energy Device and i need to see in code if the device is connected or not.
First thing i noticed was that there is in the Devicemanager a Attribute "Verbunden"-> English: Connected and it says true or false if my device is connected or not. So i need to read that Attribute in my program.
What i have tried till now:
Getting all Devices with SetupDiGetClassDevs
Getting the FriendlyName with SetupDiGetDeviceRegistryProperty
Searching for my Device with the name.
That works.
Now i wanted to get that Connected-Attribute but i didn't find out what i have to use at SetupDiGetDeviceRegistryProperty.
SetupDiGetDeviceRegistryProperty is described here https://msdn.microsoft.com/en-us/library/windows/hardware/ff551967(v=vs.85).aspx
Maybe someone knows what is the right value for Property.
My Code:
int get_device_info( void )
{
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
FILE * devices = fopen("devices.txt", "a+");
GUID AGuid;
//GUID can be constructed from "{xxx....}" string using CLSID
CLSIDFromString(TEXT(TO_SEARCH_DEVICE_UUID), &AGuid);
GUID BluetoothInterfaceGUID = AGuid;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(&BluetoothInterfaceGUID,
0, // Enumerator
0,
DIGCF_ALLCLASSES | DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return 1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//
// Call function with null to begin with,
// then use the returned buffer size (doubled)
// to Alloc the buffer. Keep calling until
// success or an unknown failure.
//
// Double the returned buffersize to correct
// for underlying legacy CM functions that
// return an incorrect buffersize value on
// DBCS/MBCS systems.
//
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
//SPDRP_DEVICEDESC,
//SPDRP_CAPABILITIES,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() ==
ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = (wchar_t *)LocalAlloc(LPTR,buffersize * 2);
}
else
{
// Insert error handling here.
break;
}
}
if(buffer)
{
if( strcmp("Name of Device",AnsiString(buffer).c_str())==0)
{
fprintf(devices,"Result:[%s]",AnsiString(buffer).c_str());
if (buffer) LocalFree(buffer);
}
}
}
if ( GetLastError()!=NO_ERROR &&
GetLastError()!=ERROR_NO_MORE_ITEMS )
{
// Insert error handling here.
return 1;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
fclose(devices);
return 0;
}
Instead of using SetupDiEnumDeviceInfo, you would try:
1. using SetupDiEnumDeviceInterfaces
2. using SetupDiGetDeviceInterfaceProperty
3. using SetupDiGetDeviceInterfacePropertyKeys to get a list of all Property Keys available for the interface
4. using SetupDiGetDeviceProperty and/or SetupDiGetDeviceRegistryProperty
Instead of using SPDRP_XXX constants, you would use DEVPROP, as defined in 'devpkey.h' ...
Below are a few examples taken from the log of a test prog I wrote to discover the whole thing:
DEVPROPNAME: DEVPKEY_DeviceInterface_Bluetooth_DeviceAddress
DEVPROPGUID: {2BD67D8B-8BEB-48D5-87E0-6CDA3428040A}
DEVPROPPID: 1
DEVPROPTYPE: DEVPROP_TYPE_STRING
Value: c026df001017
DEVPROPNAME: DEVPKEY_Device_Children
DEVPROPGUID: {4340A6C5-93FA-4706-972C-7B648008A5A7}
DEVPROPPID: 9
DEVPROPTYPE: DEVPROP_TYPE_STRING_LIST
Value:
BTHLEDevice\{00001800-0000-1000-8000-00805f9b34fb}_c026df001017\8&2fd07168&1&0001
BTHLEDevice\{00001801-0000-1000-8000-00805f9b34fb}_c026df001017\8&2fd07168&1&0008
BTHLEDevice\{00001809-0000-1000-8000-00805f9b34fb}_c026df001017\8&2fd07168&1&000c
BTHLEDevice\{0000180f-0000-1000-8000-00805f9b34fb}_c026df001017\8&2fd07168&1&0010
BTHLEDevice\{0000180a-0000-1000-8000-00805f9b34fb}_c026df001017\8&2fd07168&1&0014
BTHLEDevice\{00001523-1212-efde-1523-785feabcd123}_c026df001017\8&2fd07168&1&0019
On a second subject, you are 'working' on the 'device' itself ( SetupDiGetClassDevs(&BluetoothInterfaceGUID...) [and then working on the \BTHLE\ tree in Registry].
After listing all GattServices of this device and getting their uuids, you could restart that iteration on the device_guid itself SetupDiGetClassDevs(&GattServiceGUID...) [and then working on the \BTHLEDevice\ tree in Registry].
Now, to answer your question, I'm still searching myself :) But I'm not really sure:
1) that it is a working (dynamic) information to know the connection state
2) that it is a 'Property' you can access by the above methods
I have found out a solution.
GUID AGuid;
//GUID can be constructed from "{xxx....}" string using CLSID
CLSIDFromString(TEXT(TO_SEARCH_DEVICE_UUID), &AGuid);
GUID BluetoothInterfaceGUID = AGuid;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(&BluetoothInterfaceGUID,
0, // Enumerator
0,
DIGCF_ALLCLASSES | DIGCF_PRESENT);//DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);//DIGCF_ALLCLASSES | DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return 1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
LPTSTR buffer1 = NULL;
DWORD buffersize = 0;
while (!SetupDiGetDeviceRegistryProperty( // Get Name
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() ==
ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = (wchar_t *)LocalAlloc(LPTR,buffersize * 2);
}
else
{
// Insert error handling here.
break;
}
}
{
if(strcmp("Your Device",AnsiString(buffer).c_str())==0) //Found your device
{
//########
DEVPROPTYPE ulPropertyType;
DWORD dwSize;
ULONG devst;
// memset(devst,0,sizeof(devst));
bool err = SetupDiGetDeviceProperty( //Checking Connection State
hDevInfo,
&DeviceInfoData,
&DEVPKEY_Device_DevNodeStatus, //Connected(0x02000000)
&ulPropertyType,
(BYTE *) &devst,
sizeof(devst),
&dwSize,
0);
DWORD error;
error = GetLastError();
if (devst &0x02000000) {
//"Status: Getrennt "
}
else
{
//"Status: Verbunden"
}
Hope this snippet helps.
I am trying to retrieve the name and handle of all paired bluetooth devices on a windows 8.1 machine.
I can get the name, but SetupDiEnumDeviceInterfaces always returns false. I read somewhere that I need to include DIGCF_DEVICEINTERFACE in the SetupDIGetClassDevs function, but it still doesn't work.
Here is my code:
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(
&GUID_DEVCLASS_BLUETOOTH,
0, 0, DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return;//1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i,
&DeviceInfoData); i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer) delete(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = new wchar_t[buffersize * 2];
}
else{
// Insert error handling here.
break;
}
}
HWND deviceList = GetDlgItem(GetActiveWindow(), LIST_BOX);
if (deviceList && buffersize > 0)
{
SendMessage(deviceList, LB_ADDSTRING, 0, (LPARAM)buffer);
}
if (buffer) delete(buffer);
// WORKS UNTIL HERE BUT ENUMERATING THROUGH INTERFACES ALWAYS RETURNS FALSE
SP_DEVICE_INTERFACE_DATA devIntData;
HDEVINFO hDevInfo2 = SetupDiGetClassDevs(
&GUID_DEVCLASS_BLUETOOTH,
0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (SetupDiEnumDeviceInterfaces(hDevInfo2,
&DeviceInfoData,
&GUID_BLUETOOTHLE_DEVICE_INTERFACE,
i,
&devIntData))
{
DWORD reqSize;
SP_DEVINFO_DATA buffer;
while (SetupDiGetDeviceInterfaceDetail(hDevInfo2,
&devIntData,
NULL,
NULL,
&reqSize,
&buffer))
{
OutputDebugString(L"DeviceINTERFACE");
}
}
}
I have tried putting the device enumeration outside of the name enumeration loop, but it still returns false also I would like the handle and the name to be associated so I would like them to be found in the same context.
If anyone has any sample code on a full bluetooth LE workflow in windows 8.1 (find name, find handles, find services, find characteristics, write to characteristics) and could share that with me I would greatly appreciate it. Thanks.
Figured it out, wasn't allocating memory for my buffers properly.
EDIT: Adding code
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(
&GUID_DEVCLASS_BLUETOOTH,
0, 0, DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return;//1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i,
&DeviceInfoData); i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//This loop gets the name with SPDRP_FRIENDLYNAME
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer) delete(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = new wchar_t[buffersize * 2];
}
else{
// Insert error handling here.
break;
}
}
DWORD DataT2;
LPTSTR buffer2 = NULL;
DWORD buffersize2 = 0;
//This Loop gets the Bluetooth Address with SPDRP_HARDWAREID
// NOTE: there is more information than just the address you will have
// to do some string manipulation to have just the address
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_HARDWAREID,
&DataT2,
(PBYTE)buffer2,
buffersize2,
&buffersize2))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer2) delete(buffer2);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer2 = new wchar_t[buffersize2 * 2];
}
else{
// Insert error handling here.
break;
}
}
if (buffersize > 0)
{
//do what you need with the info
//name is in buffer
//address is in buffer2
}
}
Next i get the handles in a different function because you need to enumerate over Interfaces and not info with SetupDiEnumDeviceInterfaces instead of SetupDiEnumDeviceInfo in the for loop
Using the bluetooth address I match the two and store appropriately
I am attempting to list the device information for all the monitors currently connected to the computer. I have a function that can do this and its 90% done except when I go to call the function SetupDiGetClassDevs() with the 2nd parameter set(not NULL) then the function always fails(returns INVALID_HANDLE_VALUE).
When I call GetLastError() I get the error 13(decimal), ie, "The data is invalid" which I am not sure what that means?
What is going wrong? Can you provide any advice on whats happening and how I can fix it?
Function Information:
HDEVINFO SetupDiGetClassDevs(
_In_opt_ const GUID *ClassGuid,
_In_opt_ PCTSTR Enumerator, // According to MSDN this param MUST be set if I want Device Information for a specific class(Monitors)
_In_opt_ HWND hwndParent,
_In_ DWORD Flags
);
My function that attempts to get a Device Information Set for Monitors only and output each monitors details(the error line is commented):
void printDeviceData(GUID guID)
{
// Device Classes: http://msdn.microsoft.com/en-us/library/windows/hardware/ff553426
// System Device Classes: http://msdn.microsoft.com/en-us/library/windows/hardware/ff553428
// Monitor Class GUI: {4d36e96e-e325-11ce-bfc1-08002be10318}
DWORD dataT = 0;
PCTSTR monitorGuID = _T("");
SP_DEVINFO_DATA deviceInfoData = {0};
deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
deviceInfoData.ClassGuid = guID;
// Step 1: Get Device Information Set for Monitors only
// ERROR OCCURS HERE: SetupDiGetClassDevs() always fails
// Also tried these values for param 2: "Monitor" "PCI" but all cause the function to return INVALID_HANDLE_VALUE
HDEVINFO hDevInfo = SetupDiGetClassDevs(&guID, _T("{4d36e96e-e325-11ce-bfc1-08002be10318}"), NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (hDevInfo == INVALID_HANDLE_VALUE) {
//outputLastError(_T("Fail 1"));
printf("hDevInfo == INVALID_HANDLE_VALUE\n");
return;
}
else printf("SUCCESS 1\n");
if (SetupDiGetSelectedDevice(hDevInfo, &deviceInfoData) == FALSE) {
//outputLastError(_T("SetupDiGetSelectedDevice(hDevInfo, &deviceInfoData) == FALSE"));
printf("SetupDiGetSelectedDevice(hDevInfo, &deviceInfoData) == FALSE, %d, %x\n", GetLastError(), GetLastError());
return;
}
else printf("SUCCESS 2\n");
// Step 2: For each Monitor: Output Device information
const unsigned int FLAG_NUM = 30;
DWORD flags[] = {SPDRP_FRIENDLYNAME, SPDRP_ENUMERATOR_NAME, SPDRP_PHYSICAL_DEVICE_OBJECT_NAME, SPDRP_DEVICEDESC,
SPDRP_ADDRESS, SPDRP_BUSNUMBER, SPDRP_BUSTYPEGUID, SPDRP_CHARACTERISTICS, SPDRP_CLASS, SPDRP_CLASSGUID,
SPDRP_COMPATIBLEIDS, SPDRP_CONFIGFLAGS, SPDRP_DEVICE_POWER_DATA, SPDRP_DEVTYPE, SPDRP_DRIVER,
SPDRP_ENUMERATOR_NAME, SPDRP_EXCLUSIVE, SPDRP_HARDWAREID, SPDRP_INSTALL_STATE, SPDRP_LEGACYBUSTYPE,
SPDRP_LOCATION_INFORMATION, SPDRP_LOCATION_PATHS, SPDRP_LOWERFILTERS, SPDRP_MFG,
SPDRP_PHYSICAL_DEVICE_OBJECT_NAME, SPDRP_UI_NUMBER, SPDRP_UI_NUMBER_DESC_FORMAT, SPDRP_UPPERFILTERS,
SPDRP_SECURITY_SDS, SPDRP_SECURITY, SPDRP_SERVICE };
for (int i=0; i<=FLAG_NUM; i++) {
DWORD buffersize = 0;
LPTSTR buffer = NULL;
while (!SetupDiGetDeviceRegistryProperty(hDevInfo, &deviceInfoData, flags[i], &dataT,
(PBYTE)buffer, buffersize, &buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
// Change the buffer size.
if (buffer)
LocalFree(buffer);
buffer = (LPTSTR)LocalAlloc(LPTR, buffersize);
}
else {
// Insert error handling here.
break;
}
}
printf("Data: %d: %s\n", i, buffer);
if (buffer)
LocalFree(buffer);
}
SetupDiDestroyDeviceInfoList(hDevInfo);
}
According to the documentation, Enumerator must be set to a valid device Instance ID which according to http://msdn.microsoft.com/en-us/library/windows/hardware/ff541327 has to be specified like this
"PCI\VEN_1000&DEV_0001&SUBSYS_00000000&REV_02\1&08"
I haven't tested it, but I'd assume that's where the invalid data come from.
Evening everyone I wondered if some could answer me 2 quick questions.
I made an app to communicate with arm device which works fine, however when I move PC etc, I need to reconfigure the device path. Its a long one like below.
Path: \\?\usb#vid_045e&pid_0040#6&ff454f2&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
I done some reading up and discovered it's two features SetupDiGetClassDevs and SetupDiGetDeviceInstanceId I need. My question is am I looking in the right place i.e will these 2 functions return the path like above. Also what is the techinical name for this path?
I found what I think is a nice example (always learn better from example) on Microsoft's website cut and paste below but this throws up error C2440: '=' : cannot convert from 'HLOCAL' to 'LPTSTR'
which is a new one on me a pointer error?
This is the code
#include <stdio.h>
#include <windows.h>
#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>
int main( int argc, char *argv[ ], char *envp[ ] )
{
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(NULL,
0, // Enumerator
0,
DIGCF_PRESENT | DIGCF_ALLCLASSES );
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return 1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//
// Call function with null to begin with,
// then use the returned buffer size (doubled)
// to Alloc the buffer. Keep calling until
// success or an unknown failure.
//
// Double the returned buffersize to correct
// for underlying legacy CM functions that
// return an incorrect buffersize value on
// DBCS/MBCS systems.
//
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_DEVICEDESC,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() ==
ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = LocalAlloc(LPTR,buffersize * 2); // ERROR LINE
}
else
{
// Insert error handling here.
break;
}
}
printf("Result:[%s]\n",buffer);
if (buffer) LocalFree(buffer);
}
if ( GetLastError()!=NO_ERROR &&
GetLastError()!=ERROR_NO_MORE_ITEMS )
{
// Insert error handling here.
return 1;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
return 0;
}
Hope its an easy one thank you.
You need to typecast the return value from LocalAlloc():
buffer = (LPSTR) LocalAlloc(LPTR,buffersize * 2);
For more info, see the LocalAlloc() documentation on MSDN.
How is should a HLOCAL data type be converted to a LPTSTR data type? I'm trying to get a code snippet from Microsoft working, and this is the only error, of which I'm not sure how to resolve:
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(NULL,
0, // Enumerator
0,
DIGCF_PRESENT | DIGCF_ALLCLASSES );
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return NULL;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//
// Call function with null to begin with,
// then use the returned buffer size (doubled)
// to Alloc the buffer. Keep calling until
// success or an unknown failure.
//
// Double the returned buffersize to correct
// for underlying legacy CM functions that
// return an incorrect buffersize value on
// DBCS/MBCS systems.
//
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_DEVICEDESC,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = LocalAlloc(LPTR,buffersize * 2); // <- Error Occurs Here
}
else
{
// Insert error handling here.
break;
}
}
printf("Result:[%s]\n",buffer);
if (buffer) LocalFree(buffer);
}
if ( GetLastError()!=NO_ERROR && GetLastError()!=ERROR_NO_MORE_ITEMS )
{
// Insert error handling here.
return NULL;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
Thoughts are welcome. Thanks.
LocalLock() returns the pointer. But this is 18 year old silliness, just use
// Change the buffer size.
delete buffer;
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = new TCHAR[buffersize * 2];
Ignoring the ~7 year old silliness of still using TCHAR for a moment. Your printf() statement needs work, depending on whether or not you are compiling with Unicode. %ls if you do. I'm guessing that's your real problem, use wprintf().
buffer = (LPTSTR)LocalAlloc(LPTR, buffersize * 2);