如何获得硬件设备的句柄

faiqi 2003-10-30 10:26:02

比如一块PCI卡，如何获得其设备句柄　，谢谢！

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jiangchun_xn 2003-11-11

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learning

yayowd 2003-11-11

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不懂！

781014 2003-11-08

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学习

Atomictry 2003-11-04

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学习。

hongliqiu 2003-10-31

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学习～

Yuehj 2003-10-31

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例如：
//打开一个设备
HANDLE hDevice = CreateFile("\\\\.\\PYCommPort0",GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
if(hDevice==INVALID_HANDLE_VALUE)return E_FAIL;

//与设备进行通讯
if(!DeviceIoControl(hDevice,PYCOMM_IOCTL_SETDATABITS,&comDataBits,sizeof(comDataBits),NULL,
0,&Status, NULL))

Yuehj 2003-10-31

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首先要知道设备的符号连接（针对winnt环境）或设备ID(针对WDM驱动程序，WDM驱动程序有的也是使用符号连接)然后通过CreateFile函数打开设备，或使用DeviceIOControl直接与设备进行通讯。

sczyq 2003-10-31

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//----------------------------------------------------
typedef struct NetCardStruct
{
DWORD Id; // 这就是你需要的设备句柄
AnsiString Name;
bool Enabled;
bool Changed;
bool IsDisable;
bool InitState;
} TNetCardStruct;
typedef TNetCardStruct* PNetCardStruct;
//---------------------------------------------------------------------------
void __fastcall EnumNetCards(TList *NetDeviceList)
{
AnsiString DevValue;
PNetCardStruct NetCard;
LPTSTR Buffer = NULL;
DWORD BufSize = 0;
HDEVINFO hDevInfo = 0;
if (INVALID_HANDLE_VALUE == (hDevInfo =
SetupDiGetClassDevs(NULL,NULL,0,DIGCF_PRESENT|DIGCF_ALLCLASSES)))
return;
SP_DEVINFO_DATA DeviceInfoData = {sizeof(SP_DEVINFO_DATA)};
for (DWORD DeviceId=0;
SetupDiEnumDeviceInfo(hDevInfo,DeviceId,&DeviceInfoData); DeviceId++)
{
DevValue.SetLength(0);
if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_CLASS , &Buffer, (PULONG)&BufSize))
DevValue = Buffer;
if (DevValue == "Net") // 判断设备是网卡
{
DevValue.SetLength(0);
if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_ENUMERATOR_NAME , &Buffer, (PULONG)&BufSize))
DevValue = Buffer;
if (DevValue != "ROOT") // 判断设备不是虚拟设备
{
NetCard = new TNetCardStruct;
NetCard->Id = DeviceId;
NetCard->Name = "<Unknown Device>";
if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_DRIVER , &Buffer, (PULONG)&BufSize))
if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_DEVICEDESC , &Buffer, (PULONG)&BufSize))
NetCard->Name = Buffer;
NetCard->Changed = false;
NetCard->IsDisable = false;
NetCard->Enabled = GetNetCardState(DeviceInfoData.DevInst) == gdsEnabled;
NetCard->InitState = NetCard->Enabled;
NetDeviceList->Add(NetCard);
}
}
}
}
//---------------------------------------------------------------------------
bool __fastcall GetRegistryProperty(HDEVINFO DeviceInfoSet,
PSP_DEVINFO_DATA DeviceInfoData, ULONG Property, PVOID Buffer, PULONG Length)
{
while (!SetupDiGetDeviceRegistryProperty(DeviceInfoSet,
DeviceInfoData, Property, NULL, (BYTE *)*(TCHAR **)Buffer, *Length, Length))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
if (*(LPTSTR *)Buffer) LocalFree(*(LPTSTR *)Buffer);
*(LPTSTR *)Buffer = (PCHAR)LocalAlloc(LPTR,*Length);
}
else return false;
}
return (*(LPTSTR *)Buffer)[0];
}

sfemil 2003-10-30