CODEWITHSUNDEEP
windowswindbgvisual-studio-debuggingumdfoutputdebugstring
Akshdeep Singh
Akshdeep Singh

Reputation: 1457

Umdf2 Hello World Driver, Where to see output?

I want to write a UMDF2 windows driver, I don't know where to see the output from OutputDebugString.

This is my code, similar to KMDF Hello World.

#include <Windows.h>
#include <wdf.h>

NTSTATUS UmdfHelloWorldEvtDeviceAdd(_In_ WDFDRIVER Driver, _Inout_ PWDFDEVICE_INIT DeviceInit)
{
    UNREFERENCED_PARAMETER(Driver);

    NTSTATUS status;
    WDFDEVICE hDevice;

    OutputDebugString((LPCWSTR)"UmdfHelloWorld: EvtDeviceAdd\n");

    status = WdfDeviceCreate(&DeviceInit, WDF_NO_OBJECT_ATTRIBUTES, &hDevice);

    return status;
}

NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING RegistryPath)
{
    NTSTATUS status = STATUS_SUCCESS;
    WDF_DRIVER_CONFIG config;

    OutputDebugString((LPCWSTR)"UmdfHelloWorld: DriverEntry\n");

    WDF_DRIVER_CONFIG_INIT(&config, UmdfHelloWorldEvtDeviceAdd);
    status = WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
    
    return status;
}

Running the KMDF Hello World driver is giving me output successfully on windbg kernel-mode debugging. However, the UMDF Hello World driver shows no output.

This is how I'm (un)installing drivers:

devcon.exe install UmdfHelloWorld.inf Root\UmdfHelloWorld
devcon.exe remove Root\UmdfHelloWorld

Also, I want to use user-mode debugging, but I don't know how to do that for UMDF drivers.

Upvotes: 2

Views: 1064

Answers (1)

Mr Qian
Mr Qian

Reputation: 23838

Umdf2 Hello World Driver, Where to see output?

Just as Lex said, you could use DebugView to view the output for UMDF drivers.

Besdies, you can try to use WPP Software Tracing in UMDF Drivers.

Upvotes: 0

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