Where can I get pkfuncs.h (and access to KernelIoControl)?
I'm trying to call KernelIoControl but can't find the header file pkfuncs.h a开发者_Python百科nywhere.
I'm wondering if: a) Is there a secret download I need? b) Or is it not present because the device's SDK I'm using (Casio) does not include these libraries?
Also ... presumably it's WINAPI? I think I'll just dynamically link to it.
You don't need the header to call KernelIoControl. Just add this to your own app:
extern "C" BOOL KernelIoControl(
DWORD dwIoControlCode,
LPVOID lpInBuf,
DWORD nInBufSize,
LPVOID lpOutBuf,
DWORD nOutBufSize,
LPDWORD lpBytesReturned
);
The linker will find it for you.
In my searching I also found this page very useful on getting the IOCTRL_HAL_GET_DEVICEID:
It also details the DEVICE_ID structure, which is necessary to use the call:
#define IOCTL_HAL_GET_DEVICEID CTL_CODE(FILE_DEVICE_HAL, 21, METHOD_BUFFERED, FILE_ANY_ACCESS)
typedef struct _DEVICE_ID {
DWORD dwSize;
DWORD dwPresetIDOffset;
DWORD dwPresetIDBytes;
DWORD dwPlatformIDOffset;
DWORD dwPlatformIDBytes;
} DEVICE_ID, *PDEVICE_ID;
What isn't necessarily obvious is that the data contained at the given offsets are just int values, and probably best viewed as hex codes.
Here is code that I use to get a unique device ID:
PDWORD pdwTmp;
DWORD dwUIDLen;
DWORD dwLen;
DWORD dwIdx;
BYTE abData[512];
BYTE abID[64];
PDEVICE_ID pDvcID;
dwLen = 0;
memset(abID, 0, sizeof(abID));
memset(abData, 0, sizeof(abData));
pDvcID = (PDEVICE_ID) abData;
pDvcID->dwSize = sizeof(abData);
KernelIoControl(IOCTL_HAL_GET_DEVICEID, NULL, 0, abData, sizeof(abData), &dwLen);
// If valid data was returned build ID from both parts
if ( (dwLen >= (sizeof(*pDvcID) + 8)) // Enough bytes returned for struct and 8 ID bytes
&& (dwLen >= pDvcID->dwSize) // Bytes returned is at least indicated struct size
&& pDvcID->dwPresetIDBytes && pDvcID->dwPlatformIDBytes // Both ID's are present
&& (pDvcID->dwPresetIDOffset >= sizeof(*pDvcID)) // Preset ID offset is reasonable
&& (pDvcID->dwPlatformIDOffset >= sizeof(*pDvcID)) // Platform ID offset is reasonable
&& ((pDvcID->dwPresetIDOffset + pDvcID->dwPresetIDBytes) // Preset ID is in bounds
<= pDvcID->dwSize)
&& ((pDvcID->dwPlatformIDOffset + pDvcID->dwPlatformIDBytes)// Platform ID is in bounds
<= pDvcID->dwSize) )
{
// Copy as much of the Preset ID as will fit
dwIdx = pDvcID->dwPresetIDBytes;
if ( dwIdx > sizeof(abID) )
dwIdx = sizeof(abID);
if ( dwIdx )
memcpy(abID, abData + pDvcID->dwPresetIDOffset, dwIdx);
dwLen = dwIdx;
// Copy as much of the Platform ID as will fit
dwIdx = pDvcID->dwPlatformIDBytes;
if ( dwIdx > (sizeof(abID) - dwLen) )
dwIdx = (sizeof(abID) - dwLen);
if ( dwIdx )
memcpy(abID + dwLen, abData + pDvcID->dwPlatformIDOffset, dwLen);
dwLen += dwIdx;
}
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