WINCE流驱动开发（理论知识）

// STR.cpp : Defines the entry point for the DLL application. // #include <windows.h> #include <halether.h> #include <tchar.h> #define BUFSIZE 256 HANDLE g_hInstance; WCHAR achBuffer[BUFSIZE]; //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- bool DllEntry(HANDLE hinstDLL, DWORD dwReason, LPVOID lpvReserved ) { //EdbgOutputDebugString("STR DLLENTRY HAS BEEN IN \n"); switch(dwReason) { case DLL_PROCESS_ATTACH: g_hInstance = hinstDLL; RETAILMSG(1,(TEXT("STRINGS: DLL_PROCESS_ATTACH\n"))); return TRUE; case DLL_THREAD_ATTACH: RETAILMSG(1,(TEXT("STRINGS: DLL_THREAD_ATTACH\n"))); break; case DLL_THREAD_DETACH: RETAILMSG(1,(TEXT("STRINGS: DLL_THREAD_DETACH\n"))); break; case DLL_PROCESS_DETACH: RETAILMSG(1,(TEXT("STRINGS: DLL_PROCESS_DETACH\n"))); break; #ifdef UNDER_CE case DLL_PROCESS_EXITING: RETAILMSG(1,(TEXT("STRINGS: DLL_PROCESS_EXITING\n"))); break; case DLL_SYSTEM_STARTED: RETAILMSG(1,(TEXT("STRINGS: DLL_SYSTEM_STARTED\n"))); break; #endif } // EdbgOutputDebugString("STR DLLENTRY HAS BEEN IN \n"); return TRUE; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- bool STR_Close(DWORD hOpenContext) { BOOL bRet = TRUE; RETAILMSG(1,(TEXT("STRINGS: STR_Close\n"))); return bRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- bool STR_Deinit(DWORD hDeviceContext) { BOOL bRet = TRUE; RETAILMSG(1,(TEXT("STRINGS: STR_Deinit\n"))); return bRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- DWORD STR_Init(DWORD dwContext) { DWORD dwRet = 0; RETAILMSG(1,(TEXT("STRINGS: STR_Init\n"))); // Initialize buffer to zero. memset (achBuffer, 0, BUFSIZE * sizeof(WCHAR)); // Set return value to non-zero. dwRet = 1; return dwRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- bool STR_IOControl(DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut) { BOOL bRet = TRUE; RETAILMSG(1,(TEXT("STRINGS: STR_IOControl\n"))); return bRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- DWORD STR_Open(DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode) { DWORD dwRet = 0; RETAILMSG(1,(TEXT("STRINGS: STR_Open\n"))); dwRet = 1; // Have to make non-zero for this call to succeed. return dwRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- void STR_PowerDown(DWORD hDeviceContext) { RETAILMSG(1,(TEXT("STRINGS: STR_PowerDown\n"))); } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- void STR_PowerUp(DWORD hDeviceContext) { RETAILMSG(1,(TEXT("STRINGS: STR_PowerUp\n"))); } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- DWORD STR_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count) { DWORD dwRet = 0; RETAILMSG(1,(TEXT("STRINGS: STR_Read\n"))); // Copy the smaller of buffer size or string size. DWORD cbBuffer = wcslen(achBuffer); dwRet = min(cbBuffer, Count); wcsncpy((LPWSTR)pBuffer, achBuffer, dwRet); // Return number of bytes read. return dwRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- DWORD STR_Seek(DWORD hOpenContext, long Amount, DWORD Type) { DWORD dwRet = 0; RETAILMSG(1,(TEXT("STRINGS: STR_Seek\n"))); return dwRet; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- DWORD STR_Write(DWORD hOpenContext, LPCVOID pSourceBytes, DWORD NumberOfBytes) { DWORD dwRet = 0; RETAILMSG(1,(TEXT("STRINGS: STR_Write\n"))); // Copy the smaller of buffer size or number of bytes they send us. dwRet = min(BUFSIZE, NumberOfBytes); wcsncpy(achBuffer, (LPWSTR)pSourceBytes, dwRet); // Return number of bytes written. return dwRet; }