驅動程式 - Windows Driver Model (WDM) - 使用範例 - C/C++ (DDK) - Handle IOCTL IRP - Choose METHOD_BUFFERED

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

main.c

#include <wdm.h>
 
#define IOCTL_GET CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_SET CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)
 
#define DEV_NAME L"\\Device\\MyDriver"
#define SYM_NAME L"\\DosDevices\\MyDriver"
 
char szBuffer[255] = {0};
PDEVICE_OBJECT pNextDevice = NULL;
 
NTSTATUS AddDevice(PDRIVER_OBJECT pMyDriver, PDEVICE_OBJECT pPhyDevice)
{
    PDEVICE_OBJECT pMyDevice = NULL;
    UNICODE_STRING usDeviceName = { 0 };
    UNICODE_STRING usSymbolName = { 0 };
 
    RtlInitUnicodeString(&usDeviceName, DEV_NAME);
    IoCreateDevice(pMyDriver, 0, &usDeviceName, FILE_DEVICE_UNKNOWN, 0, FALSE, &pMyDevice);
    RtlInitUnicodeString(&usSymbolName, SYM_NAME);
    IoCreateSymbolicLink(&usSymbolName, &usDeviceName);
    pNextDevice = IoAttachDeviceToDeviceStack(pMyDevice, pPhyDevice);
    pMyDevice->Flags &= ~DO_DEVICE_INITIALIZING;
    pMyDevice->Flags |= DO_BUFFERED_IO;
    return STATUS_SUCCESS;
}
     
void Unload(PDRIVER_OBJECT pMyDriver)
{
    pMyDriver = pMyDriver;
}
 
NTSTATUS IrpPnp(PDEVICE_OBJECT pMyDevice, PIRP pIrp)
{
    UNICODE_STRING usSymbolName = { 0 };
    PIO_STACK_LOCATION pStack = IoGetCurrentIrpStackLocation(pIrp);
 
    if (pStack->MinorFunction == IRP_MN_REMOVE_DEVICE) {
        RtlInitUnicodeString(&usSymbolName, SYM_NAME);
        IoDeleteSymbolicLink(&usSymbolName);
        IoDetachDevice(pNextDevice);
        IoDeleteDevice(pMyDevice);
        IoCompleteRequest(pIrp, IO_NO_INCREMENT);
        return STATUS_SUCCESS;
    }
    IoSkipCurrentIrpStackLocation(pIrp);
    return IoCallDriver(pNextDevice, pIrp);
}
 
NTSTATUS IrpIOCTL(PDEVICE_OBJECT pMyDevice, PIRP pIrp)
{
    ULONG dwLen = 0;
    PIO_STACK_LOCATION pStack = IoGetCurrentIrpStackLocation(pIrp);
 
    switch (pStack->Parameters.DeviceIoControl.IoControlCode) {
    case IOCTL_SET:
        DbgPrint("IOCTL_SET");
        dwLen = pStack->Parameters.DeviceIoControl.InputBufferLength;
        memcpy(szBuffer, pIrp->AssociatedIrp.SystemBuffer, dwLen);
        DbgPrint("Buffer: %s, Length: %d", szBuffer, dwLen);
        break;
    case IOCTL_GET:
        DbgPrint("IOCTL_GET");
        dwLen = strlen(szBuffer);
        memcpy(pIrp->AssociatedIrp.SystemBuffer, szBuffer, dwLen);
        break;
    }
    pIrp->IoStatus.Status = STATUS_SUCCESS;
    pIrp->IoStatus.Information = dwLen;
    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}
 
NTSTATUS IrpFile(PDEVICE_OBJECT pMyDevice, PIRP pIrp)
{
    PIO_STACK_LOCATION pStack = IoGetCurrentIrpStackLocation(pIrp);
 
    switch (pStack->MajorFunction) {
    case IRP_MJ_CREATE:
        DbgPrint("IRP_MJ_CREATE");
        break;
    case IRP_MJ_CLOSE:
        DbgPrint("IRP_MJ_CLOSE");
        break;
    }
    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}
 
NTSTATUS DriverEntry(PDRIVER_OBJECT pMyDriver, PUNICODE_STRING pMyRegistry)
{
    pMyDriver->MajorFunction[IRP_MJ_PNP]            = IrpPnp;
    pMyDriver->MajorFunction[IRP_MJ_CREATE]         = IrpFile;
    pMyDriver->MajorFunction[IRP_MJ_CLOSE]          = IrpFile;
    pMyDriver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = IrpIOCTL;
    pMyDriver->DriverExtension->AddDevice = AddDevice;
    pMyDriver->DriverUnload = Unload;
    return STATUS_SUCCESS;
}

完成