| //*************************************************************** // From the book "Win32 System Services: The Heart of Windows NT" // by Marshall Brain // Published by Prentice Hall file:// // This code implements a simple mailslot sender. file://*************************************************************** // sms_send.c // Usage: sms_send #include #include #include int main() { char toSendTxt[100], buffer[100]; DWORD bufferLen=100; HANDLE hSMS_Slot; BOOL Status; DWORD NumBytesWritten; /* Create the mailslot file handle for sending messages */ hSMS_Slot=CreateFile("\\\\*\\mailslot\\sms", GENERIC_WRITE, FILE_SHARE_READ, (LPSECURITY_ATTRIBUTES) NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, (HANDLE) NULL); /* Check and see if the mailslot file was opened, if not terminate program */ if (hSMS_Slot == INVALID_HANDLE_VALUE) { cerr << "ERROR: Unable to create mailslot " << GetLastError() << endl; return (1); } /* form string to send */ GetComputerName(buffer, &bufferLen); strcpy(toSendTxt, "Test string from "); strcat(toSendTxt, buffer); /* Repeatedly send message until program is terminated */ while(1) { cout << "Sending..." << endl; /* Write message to mailslot */ Status=WriteFile(hSMS_Slot, toSendTxt, (DWORD) strlen(toSendTxt)+1, &NumBytesWritten, (LPOVERLAPPED) NULL); /* If error occurs when writing to mailslot, terminate program */ if (!Status) { cerr << "ERROR: Unable to write to mailslot " << GetLastError() << endl; CloseHandle(hSMS_Slot); return (1); } /* Wait sending the message again */ Sleep(4800); } /* while*/ } |
