demodriver.cpp

Pocket PC RS232 port source code

// MyDriver.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"

#define LOG_CALLS

void Log(char *szStr, bool bLF = true)
{
	FILE *f = fopen("\\DemoDriverLog.txt", "a");
	fprintf(f, "%u", GetTickCount());
	fprintf(f, "%s", szStr);
	if (bLF)
		fprintf(f, "\n");
	fflush(f);
	fclose(f);
}

DEMODLL_API DWORD COM_Init(LPCTSTR pContext, LPCVOID lpvBusContext);
DEMODLL_API BOOL COM_Deinit( DWORD hDeviceContext );
DEMODLL_API DWORD COM_Open( DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode );
DEMODLL_API BOOL COM_Close( DWORD hOpenContext );
DEMODLL_API BOOL COM_IOControl( DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut );
DEMODLL_API void COM_PowerUp( DWORD hDeviceContext );
DEMODLL_API void COM_PowerDown( DWORD hDeviceContext );
DEMODLL_API DWORD COM_Read( DWORD hOpenContext, LPVOID pBuffer, DWORD Count );
DEMODLL_API DWORD COM_Write( DWORD hOpenContext, LPCVOID pBuffer, DWORD Count );
DEMODLL_API DWORD COM_Seek( DWORD hOpenContext, long Amount, WORD Type );

#define DEVICE_CONTEXT	0x1450
#define OPEN_CONTEXT 0x1451

HANDLE hComm = INVALID_HANDLE_VALUE;
DWORD dwManagePort = 1;

BOOL APIENTRY DllMain( HANDLE hModule, 
					  DWORD  ul_reason_for_call, 
					  LPVOID lpReserved
					  )
{
	switch ( ul_reason_for_call )
	{
	case DLL_PROCESS_ATTACH:
		break;
	case DLL_PROCESS_DETACH:
		break;
	case DLL_THREAD_ATTACH:
		break;
	case DLL_THREAD_DETACH:
		break;
	}
	return TRUE;
}

DEMODLL_API DWORD COM_Init( LPCTSTR pContext, LPCVOID lpvBusContext)
{
#ifdef LOG_CALLS
	Log("Init");
#endif
	DWORD dwPort = 0;
	HKEY hKey;
	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, pContext, 0, 0, &hKey) == ERROR_SUCCESS)
	{
		TCHAR szDriverKey[255];
		DWORD dwSize = 255;
		DWORD dwType;
		if (RegQueryValueEx(hKey, L"Key", 0, &dwType, (BYTE *)szDriverKey, &dwSize) == ERROR_SUCCESS)
		{
			RegCloseKey(hKey);
			if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, szDriverKey, 0, 0, &hKey) == ERROR_SUCCESS)
			{
				dwSize=4;
				if (RegQueryValueEx(hKey, L"ManagePort", 0, &dwType, (BYTE *)&dwPort, &dwSize) != ERROR_SUCCESS)
					dwPort = 0;
				RegCloseKey(hKey);
			}
		}
	}
	if (dwPort != 0)
		dwManagePort = dwPort;

	return DEVICE_CONTEXT;
}

DEMODLL_API BOOL COM_Deinit( DWORD hDeviceContext )
{
	if (hDeviceContext != DEVICE_CONTEXT)
	{
#ifdef LOG_CALLS
		Log("False Deinst");
#endif
		return FALSE;
	}

#ifdef LOG_CALLS
	Log("DeInit");
#endif
	return TRUE;
}

DEMODLL_API DWORD COM_Open( DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode )
{
	if (hDeviceContext != DEVICE_CONTEXT)
	{
#ifdef LOG_CALLS
		Log("False Open");
#endif
		return 0;
	}
	TCHAR szPort[255];
	swprintf(szPort, L"COM%u:", dwManagePort);

    hComm = CreateFile(
		szPort, 
		AccessCode,
		ShareMode,
		NULL,
		OPEN_EXISTING,
		0,
		NULL);

#ifdef LOG_CALLS
	char buf[255];
	sprintf(buf, "Open port %S for access %u and share %u %s", szPort, AccessCode, ShareMode, hComm ? "OK" : "Failed");
	Log(buf);
#endif

	if (hComm == INVALID_HANDLE_VALUE)
		return 0;
	else
		return OPEN_CONTEXT;
}

DEMODLL_API BOOL COM_Close( DWORD hOpenContext )
{
	if (hOpenContext != OPEN_CONTEXT)
	{
#ifdef LOG_CALLS
		Log("False Close");
#endif
		return 0;
	}

#ifdef LOG_CALLS
	Log("Close");
#endif
	BOOL bRet = CloseHandle(hComm);
	hComm = INVALID_HANDLE_VALUE;
	return bRet;
}

DEMODLL_API BOOL COM_IOControl( DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut )
{
	if (hOpenContext != OPEN_CONTEXT)
	{
#ifdef LOG_CALLS
		Log("False IOControl");
#endif
		return 0;
	}

#ifdef LOG_CALLS
	char buf[255];
	sprintf(buf, "IOControl code=%u, inlen=%u", dwCode, dwLenIn);
	Log(buf);
#endif

	BOOL bRet=DeviceIoControl(
		hComm, 
		dwCode, 
		pBufIn, 
		dwLenIn, 
		pBufOut, 
		dwLenOut,
		pdwActualOut, 
		NULL);

#ifdef LOG_CALLS
	sprintf(buf, "IOControl return bRet=%d, outlen=%u", bRet, *pdwActualOut);
	Log(buf);
#endif

	return bRet;
}

DEMODLL_API void COM_PowerUp( DWORD hDeviceContext )
{
}

DEMODLL_API void COM_PowerDown( DWORD hDeviceContext )
{
}

DEMODLL_API DWORD COM_Read( DWORD hOpenContext, LPVOID pBuffer, DWORD Count )
{
	if (hOpenContext != OPEN_CONTEXT)
	{
#ifdef LOG_CALLS
		Log("False Read");
#endif
		return 0;
	}

#ifdef LOG_CALLS
	char buf[255];
	sprintf(buf, "Read max=%u", Count);
	Log(buf);
#endif

	DWORD dwBytes = 0;
	ReadFile(hComm, pBuffer, Count, &dwBytes, NULL);

	return dwBytes;
}

DEMODLL_API DWORD COM_Write( DWORD hOpenContext, LPCVOID pBuffer, DWORD Count )
{
	if (hOpenContext != OPEN_CONTEXT)
	{
#ifdef LOG_CALLS
		Log("False Write");
#endif
		return 0;
	}

#ifdef LOG_CALLS
	char buf[255];
	sprintf(buf, "Write bytes=%u", Count);
	Log(buf);
#endif
	DWORD dwBytes = 0;
	WriteFile(hComm, pBuffer, Count, &dwBytes, NULL);
	return dwBytes;
}

DEMODLL_API DWORD COM_Seek( DWORD hOpenContext, long Amount, WORD Type )
{
#ifdef LOG_CALLS
	char buf[255];
	sprintf(buf, "Seek Amount=%u, Type=%u", Amount, Type);
	Log(buf);
#endif

	return 0;
}