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copied!<p>Easiest way is to create a Symbolic link in DriverEntry using <code>IoCreateSymbolicLink</code></p> <p>Then from the user mode program call <code>CreateFile</code> with the name of the symbolic link and use either <code>ReadFile</code>/<code>WriteFile</code> or <code>DeviceIoControl</code> to send/receive data to/from the driver.</p> <p>For <code>ReadFile</code>/<code>WriteFile</code> option you need to implement <code>IRP_MJ_READ</code>/<code>IRP_MJ_WRITE</code> processing in your driver. </p> <p>For <code>DeviceIoControl</code> you need to handle <code>IRP_MJ_DEVICE_CONTROL</code>.</p> <p>Here's a very nice <a href="http://www.codeproject.com/Articles/9504/Driver-Development-Part-1-Introduction-to-Drivers" rel="nofollow">article</a> demonstrating this technique, with sample code for both kernel and user mode. I copied main parts from it related to your question:</p> <pre><code>//how to create symbolic link NTSTATUS DriverEntry(PDRIVER_OBJECT pDriverObject, PUNICODE_STRING pRegistryPath) { UNICODE_STRING usDriverName, usDosDeviceName; RtlInitUnicodeString(&usDriverName, L"\\Device\\Example"); RtlInitUnicodeString(&usDosDeviceName, L"\\DosDevices\\Example"); IoCreateDevice(pDriverObject, 0, &usDriverName, FILE_DEVICE_UNKNOWN, FILE_DEVICE_SECURE_OPEN, FALSE, &pDeviceObject); IoCreateSymbolicLink(&usDosDeviceName, &usDriverName); } //How to use from user mode int main() { hFile = CreateFile("\\\\.\\Example", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); //use ReadFile, WriteFile, or DeviceioControl here return 0; } </code></pre>

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