how get type of handle

Question

how get type of handle

feizzer 120

i see a picture about different type of handle in windows.

User's image

how to Get the type of a handle

Answer 1

Castorix31 77,506

NtQueryObject with ObjectTypeInformation

feizzer 120

i tried this api, and printf the typeName value like this

bool GetObjectInfoByHandle(HANDLE handle){
    if (handle == NULL || handle == INVALID_HANDLE_VALUE) {
        return false;
    }
    void* pObjectTypeInfo = NULL;
    unsigned long size = 0;
    NTSTATUS status = STATUS_INFO_LENGTH_MISMATCH;

    FARPROC NtQueryObject_funcptr = GetProcAddress(GetModuleHandle("ntdll.dll"), "NtQueryObject");

    for(int i = 0; i<10 && status == STATUS_INFO_LENGTH_MISMATCH;i++) {

        pObjectTypeInfo = malloc(size);

        status = NtQueryObject_funcptr(handle, ObjectTypeInformation, pObjectTypeInfo, size, &size);

        if (!NT_SUCCESS(status)) {
            free(pObjectTypeInfo);
        }
    }
    if (!NT_SUCCESS(status)) {
        return false;
    }

    wprintf(L"fei: %ws \n", (const char *) ((PPUBLIC_OBJECT_TYPE_INFORMATION) pObjectTypeInfo)->TypeName.Buffer);

    return true;
}

int main()
{
    //GetSystemHandle();
    HANDLE hReadPipe = NULL;
    HANDLE  hWritePipe = NULL;

    CreatePipe(&hReadPipe, &hWritePipe, NULL, 0);
    
    GetObjectInfoByHandle(hReadPipe);
    GetObjectInfoByHandle(hWritePipe);
}

print result is handleType: File , Shouldn't it be pipe

anything wrong?

Castorix31 77,506 Reputation points

2023-09-07T09:03:54.74+00:00

"Pipe" is not in the list of object types (can be seen in WinObj from Sysinternals or ObjectTypesInformation & OBJECT_TYPES_INFORMATION)
feizzer 120 Reputation points

2023-09-11T06:10:11.9933333+00:00

thks， however

Is there any other way to determine whether a handle is a file or a pipe
feizzer 120 Reputation points

2023-09-11T07:10:24.21+00:00

sorry I have some misunderstandings about handles and objects。

my question is Can I use handle to get the type of the object to which the handle points to
Castorix31 77,506 Reputation points

2023-09-11T09:03:57.3033333+00:00

Is there any other way to determine whether a handle is a file or a pipe

GetFileType
feizzer 120 Reputation points

2023-09-11T09:46:17.55+00:00

thks

it works

how get type of handle

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