驅動程式 - Kernel Mode Driver Framework (KMDF) - 使用範例 - C/C++ (WDF) - PNP - Handle File IRP - Choose WdfDeviceIoDirect

參考資訊：
https://wasm.in/
http://four-f.narod.ru/
https://github.com/steward-fu/ddk

main.c

#include <ntddk.h>
#include <wdf.h>
 
#define DEV_NAME L"\\Device\\MyDriver"
#define SYM_NAME L"\\DosDevices\\MyDriver"
 
char szBuffer[255] = { 0 };
 
void IrpFileCreate(WDFDEVICE myDevice, WDFREQUEST myRequest, WDFFILEOBJECT myFileObject)
{    
    DbgPrint("IRP_MJ_CREATE");
    WdfRequestComplete(myRequest, STATUS_SUCCESS);
}
 
void IrpFileClose(WDFFILEOBJECT myFileObject)
{
    DbgPrint("IRP_MJ_CLOSE");
}
 
void IrpRead(WDFQUEUE myQueue, WDFREQUEST myRequest, size_t myLen)
{
    PMDL mdl = NULL;
    ULONG len = 0;
    UCHAR *dst = NULL;
    WDFMEMORY mem = { 0 };
     
    DbgPrint("IRP_MJ_READ");
    len = strlen(szBuffer);
    WdfRequestRetrieveOutputWdmMdl(myRequest, &mdl);
    dst= MmGetSystemAddressForMdlSafe(mdl, LowPagePriority);
    memcpy(dst, szBuffer, len);
    WdfRequestCompleteWithInformation(myRequest, STATUS_SUCCESS, len);
}
 
void IrpWrite(WDFQUEUE myQueue, WDFREQUEST myRequest, size_t myLen)
{
    PMDL mdl = NULL;
    UCHAR *src = NULL;
    WDFMEMORY mem = { 0 };
     
    DbgPrint("IRP_MJ_WRITE");
    WdfRequestRetrieveInputWdmMdl(myRequest, &mdl);
    src = MmGetSystemAddressForMdlSafe(mdl, LowPagePriority);
    memcpy(szBuffer, src, myLen);
    DbgPrint("Buffer: %s, Length:%d", szBuffer, myLen);
    WdfRequestCompleteWithInformation(myRequest, STATUS_SUCCESS, myLen);
}
 
NTSTATUS AddDevice(WDFDRIVER myDriver, PWDFDEVICE_INIT pMyDeviceInit)
{
    WDFDEVICE device = { 0 };
    UNICODE_STRING szDevName = { 0 };
    UNICODE_STRING szSymName = { 0 };
    WDF_IO_QUEUE_CONFIG io_cfg = { 0 };
    WDF_FILEOBJECT_CONFIG file_cfg = { 0 };
     
    RtlInitUnicodeString(&szDevName, DEV_NAME);
    RtlInitUnicodeString(&szSymName, SYM_NAME);
    WdfDeviceInitAssignName(pMyDeviceInit, &szDevName);

    WdfDeviceInitSetIoType(pMyDeviceInit, WdfDeviceIoDirect);
    WDF_FILEOBJECT_CONFIG_INIT(&file_cfg, IrpFileCreate, IrpFileClose, NULL);
    WdfDeviceInitSetFileObjectConfig(pMyDeviceInit, &file_cfg, WDF_NO_OBJECT_ATTRIBUTES);
    WdfDeviceCreate(&pMyDeviceInit, WDF_NO_OBJECT_ATTRIBUTES, &device);
    WdfDeviceCreateSymbolicLink(device, &szSymName);
     
    WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE(&io_cfg, WdfIoQueueDispatchSequential);
    io_cfg.EvtIoRead = IrpRead;
    io_cfg.EvtIoWrite = IrpWrite;
    return WdfIoQueueCreate(device, &io_cfg, WDF_NO_OBJECT_ATTRIBUTES, WDF_NO_HANDLE);
}
 
NTSTATUS DriverEntry(PDRIVER_OBJECT pMyDriver, PUNICODE_STRING pRegistry)
{
    WDF_DRIVER_CONFIG config = { 0 };
 
    WDF_DRIVER_CONFIG_INIT(&config, AddDevice);
    return WdfDriverCreate(pMyDriver, pRegistry, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
}

完成