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session.c
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session.c
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/*------------------------------------------------------------------------------------------------------------------
-- SOURCE FILE: session.c - Handles all messages via WndProc().
--
-- PROGRAM: dte
--
-- Functions:
-- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
-- HANDLE ConnectComm(HWND, LPCWSTR);
-- void pollPort(HWND, PWDATA);
-- BOOL outputAddChar(TCHAR, POUTPUT);
--
-- DATE: September 29th 2010
--
-- REVISIONS: (Date and Description)
--
-- DESIGNER: Tom Nightingale
--
-- PROGRAMMER: Tom Nightingale
--
-- NOTES: All Windows events are handled in this layer. Received events are passed to their associated handler
-- where any necessary processing is done before being passed on to one of the output layers.
-- Serial port transmitting and receiving goes to datalink.c, rendering and painting of received characters
-- goes to application.c.
----------------------------------------------------------------------------------------------------------------------*/
#include "application.h"
#include "session.h"
#include "datalink.h"
/*------------------------------------------------------------------------------------------------------------------
-- FUNCTION: WndProc
--
-- DATE: September 29th, 2010
--
-- REVISIONS: (Date and Description)
--
-- DESIGNER: Tom Nightingale
--
-- PROGRAMMER: Tom Nightingale
--
-- INTERFACE: LRESULT CALLBACK WndProc (HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
-- HWND hwnd
-- A handle to the window.
-- UINT Message
-- The message.
-- WPARAM wParam
-- Additional message information. The contents of this parameter depend on the value of the
-- uMsg parameter.
-- LPARAM lParam
-- Additional message information. The contents of this parameter depend on the value of the
-- uMsg parameter.
--
-- RETURNS: LRESULT - The return value is the result of the message processing and depends on the message sent.
--
-- NOTES: Win32 api main message handling function. All messages come through here and action is taken.
--
----------------------------------------------------------------------------------------------------------------------*/
LRESULT CALLBACK WndProc (HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) {
HDC hdc;
PAINTSTRUCT paintstruct;
PWDATA pWData;
HMENU menu;
TEXTMETRIC tm;
HFONT hFont;
int i;
switch (Message) {
case WM_SETFOCUS:
hdc = GetDC(hwnd);
hFont = (HFONT) GetStockObject(ANSI_FIXED_FONT);
SelectObject(hdc, hFont);
GetTextMetrics(hdc, &tm);
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
pWData->cursor.cxChar = tm.tmMaxCharWidth;
pWData->cursor.cyChar = tm.tmHeight;
// Only display carret when in CONNECT mode.
if (pWData->state == CONNECT) {
// Create a solid black caret.
CreateCaret(hwnd, NULL, CARETWIDTH, pWData->cursor.cyChar);
SetCaretPos(pWData->cursor.xCaret * pWData->cursor.cxChar, pWData->cursor.yCaret * pWData->cursor.cyChar);
// Display the caret.
ShowCaret(hwnd);
}
break;
case WM_KILLFOCUS:
// The window is losing the keyboard focus, so destroy the caret.
DestroyCaret();
break;
case WM_SIZE:
hdc = GetDC(hwnd);
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
pWData->cursor.cxBuffer = max(1, LOWORD(lParam) / pWData->cursor.cxChar);
pWData->cursor.cyBuffer = max(1, HIWORD(lParam) / pWData->cursor.cyChar);
pWData->cursor.xCaret = pWData->pOutput->pos % pWData->cursor.cxBuffer;
pWData->cursor.yCaret = max(0, pWData->pOutput->pos / pWData->cursor.cxBuffer);
SetCaretPos(pWData->cursor.xCaret * pWData->cursor.cxChar, pWData->cursor.yCaret * pWData->cursor.cyChar);
InvalidateRect(hwnd, NULL, FALSE);
ReleaseDC(hwnd, hdc);
break;
case WM_COMMAND:
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
if (pWData->state != COMMAND) {
MessageBox (hwnd, TEXT("Need to be in COMMAND to change settings."), NULL, MB_ICONERROR);
break;
}
switch (LOWORD (wParam)) {
case IDM_COM1:
pWData->hCom = ConnectComm(hwnd, TEXT("COM1"));
break;
case IDM_COM2:
pWData->hCom = ConnectComm(hwnd, TEXT("COM2"));
break;
case IDM_COM3:
pWData->hCom = ConnectComm(hwnd, TEXT("COM3"));
break;
case IDM_COM4:
pWData->hCom = ConnectComm(hwnd, TEXT("COM4"));
break;
case IDM_COM5:
pWData->hCom = ConnectComm(hwnd, TEXT("COM5"));
break;
case IDM_COM6:
pWData->hCom = ConnectComm(hwnd, TEXT("COM6"));
break;
case IDM_CONNECT:
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
// Only connect when a valid Comm port is open.
if (pWData->hCom == INVALID_HANDLE_VALUE) {
MessageBox(hwnd, TEXT("You need to set a port before you can connect."), NULL, MB_ICONERROR);
break;
}
pWData->state = CONNECT;
// Disable menu items.
menu = GetMenu(hwnd);
setMenu(menu, MF_GRAYED);
// Enable caret.
CreateCaret(hwnd, NULL, 2, pWData->cursor.cyChar);
SetCaretPos(pWData->cursor.xCaret * pWData->cursor.cxChar, pWData->cursor.yCaret * pWData->cursor.cyChar);
ShowCaret(hwnd);
break;
}
break;
case WM_KEYDOWN:
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
switch (wParam) {
case VK_ESCAPE:
// If in CONNECT mode, ESC will disconnect Comm port.
if (pWData->state == CONNECT) {
pWData->state = COMMAND;
CloseHandle(pWData->hCom);
pWData->hCom = INVALID_HANDLE_VALUE;
menu = GetMenu(hwnd);
setMenu(menu, MF_ENABLED);
InvalidateRect(hwnd, NULL, FALSE);
DestroyCaret();
}
break;
//case VK_DELETE:
//
// break;
}
break;
case WM_CHAR:
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
// Only repond to keystrokes when in CONNECT mode.
if (pWData->state != CONNECT) {
break;
}
// LOWORD(lParam) contains the number of keystrokes received (in the case of
// a key being held down).
for (i = 0; i < (int) LOWORD(lParam); i++) {
switch (wParam) {
case '\b': // backspace
SendMessage (hwnd, WM_KEYDOWN, VK_DELETE, 1) ;
// ^
// |
//FALL THROUGH;
// |
// v
default:
HideCaret(hwnd);
// Send Char out to Comm port.
Transmit(pWData->hCom, wParam);
// Add Char to Outpu buffer.
if (!outputAddChar((TCHAR) wParam, pWData->pOutput)) {
MessageBox(hwnd, TEXT("MASSIVE ERROR."), NULL, MB_ICONERROR);
CloseHandle(pWData->hCom);
PostQuitMessage(0);
}
// Prepare for printing.
hdc = GetDC(hwnd);
hFont = (HFONT) GetStockObject(ANSI_FIXED_FONT);
SelectObject(hdc, hFont);
// Print character.
printChar(hwnd, &pWData->cursor, pWData->pOutput, hdc);
ReleaseDC(hwnd, hdc);
// Increment caret position.
pWData->cursor.xCaret = ++pWData->cursor.xCaret % pWData->cursor.cxBuffer;
pWData->cursor.yCaret = max(0, pWData->pOutput->pos / pWData->cursor.cxBuffer);
SetCaretPos(pWData->cursor.xCaret * pWData->cursor.cxChar, pWData->cursor.yCaret * pWData->cursor.cyChar);
ShowCaret(hwnd);
}
}
break;
case WM_PAINT:
// Process a repaint message
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
hdc = BeginPaint(hwnd, &paintstruct); // Acquire DC
// Prepare for painting output.
hFont = (HFONT) GetStockObject(ANSI_FIXED_FONT);
SelectObject(hdc, hFont);
printOut(hwnd, &pWData->cursor, pWData->pOutput, hdc);
EndPaint(hwnd, &paintstruct);
break;
case WM_DESTROY: // Terminate program
pWData = (PWDATA) GetWindowLongPtr(hwnd, GWLP_USERDATA);
if (pWData->state == CONNECT) {
CloseHandle(pWData->hCom);
}
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, Message, wParam, lParam);
}
return 0;
}
/*------------------------------------------------------------------------------------------------------------------
-- FUNCTION: ConnectComm
--
-- DATE: September 29th, 2010
--
-- REVISIONS: (Date and Description)
--
-- DESIGNER: Tom Nightingale
--
-- PROGRAMMER: Tom Nightingale
--
-- INTERFACE: ConnectComm(HWND hwnd, LPCWSTR lpFileName)
-- HWND hwnd: The window.
-- LPCWSTR lpFileName: The name of the Comm port.
--
-- RETURNS: HANDLE: Handle to newly opened and configured Comm port.
--
-- NOTES: Opens the desired Comm port via OpenPort() and then sets timeout & other protocol config.
--
----------------------------------------------------------------------------------------------------------------------*/
HANDLE ConnectComm(HWND hwnd, LPCWSTR lpFileName) {
HANDLE hCom;
DWORD err;
BOOL success;
COMMCONFIG cc;
COMMTIMEOUTS CommTimeouts;
hCom = OpenPort(lpFileName);
if (hCom == INVALID_HANDLE_VALUE) {
MessageBox(hwnd, TEXT("Could not connect to port."), NULL, MB_ICONERROR);
return INVALID_HANDLE_VALUE;
}
// Prompt for Comm port configuration.
cc.dwSize = sizeof(COMMCONFIG);
GetCommConfig(hCom, &cc, &cc.dwSize);
CommConfigDialog(lpFileName, hwnd, &cc);
// Save Comm port configuration.
success = SetCommState(hCom, &cc.dcb);
if (!success) {
err = GetLastError();
return INVALID_HANDLE_VALUE;
}
// Prepare Comm port timeouts.
if(!GetCommTimeouts(hCom, &CommTimeouts)) {
return INVALID_HANDLE_VALUE;
}
// Set some reasonable timeouts to help balance Comm port usage for reading/writing.
CommTimeouts.ReadIntervalTimeout = 1;
CommTimeouts.ReadTotalTimeoutMultiplier = 1;
CommTimeouts.ReadTotalTimeoutConstant = 1;
CommTimeouts.WriteTotalTimeoutMultiplier = 100;
CommTimeouts.WriteTotalTimeoutConstant = 100;
SetCommTimeouts(hCom, &CommTimeouts);
return hCom;
}
/*------------------------------------------------------------------------------------------------------------------
-- FUNCTION: pollPort
--
-- DATE: September 29th, 2010
--
-- REVISIONS: (Date and Description)
--
-- DESIGNER: Tom Nightingale
--
-- PROGRAMMER: Tom Nightingale
--
-- INTERFACE: pollPort(HWND hwnd, PWDATA pWData)
-- HWND hwnd: The program's window handle.
-- PWDATA pWData: The window's stored data object.
--
-- RETURNS: void.
--
-- NOTES: Checks the open port for any new data, if received and not NULL, sends data to output string and calls
-- a printOut to render it on screen.
--
----------------------------------------------------------------------------------------------------------------------*/
void pollPort(HWND hwnd, PWDATA pWData) {
HDC hdc;
HFONT hFont;
TCHAR readBuff;
if ((readBuff = Recieve(pWData->hCom)) == NULL) {
return;
}
if (readBuff == '\0') {
return;
}
if (!outputAddChar(readBuff, pWData->pOutput)) {
MessageBox (hwnd, TEXT("MASSIVE ERROR."), NULL, MB_ICONERROR);
CloseHandle(pWData->hCom);
PostQuitMessage(0);
}
// Prepare to print character.
hdc = GetDC(hwnd);
hFont = (HFONT) GetStockObject(ANSI_FIXED_FONT);
SelectObject(hdc, hFont);
// Print character.
printChar(hwnd, &pWData->cursor, pWData->pOutput, hdc);
ReleaseDC(hwnd, hdc);
// Repostion caret.
pWData->cursor.xCaret = ++pWData->cursor.xCaret % pWData->cursor.cxBuffer;
pWData->cursor.yCaret = max(0, pWData->pOutput->pos / pWData->cursor.cxBuffer);
}
/*------------------------------------------------------------------------------------------------------------------
-- FUNCTION: outputAddChar
--
-- DATE: September 29th, 2010
--
-- REVISIONS: (Date and Description)
--
-- DESIGNER: Tom Nightingale
--
-- PROGRAMMER: Tom Nightingale
--
-- INTERFACE: outputAddChar(TCHAR c, POUTPUT pOutput)
-- TCHAR c: A char to add to the output string.
-- POUTPUT pOutput: The programs output string (dynamically resizing struct).
--
-- RETURNS: BOOL.
-- Returns true if char is added to string sucessfully.
-- Returns false if if failed (probably due to failed memory allocation when resizing the string).
--
-- NOTES: Tries to add a char to the output string, if string is full, the string is doubled in size and then
-- char is added.
--
----------------------------------------------------------------------------------------------------------------------*/
BOOL outputAddChar(TCHAR c, POUTPUT pOutput) {
int i;
TCHAR* tmp;
if (pOutput->pos == pOutput->size - 1) {
pOutput->size = 2 * pOutput->size;
// Resizing output array // NOTE: This has been known to be problematic...
//pOutput->out = (TCHAR*) realloc(pOutput->out, pOutput->size * sizeof(TCHAR));
// Alternative to realloc.
tmp = pOutput->out;
pOutput->out = (TCHAR*) malloc(pOutput->size * sizeof(TCHAR));
if (!pOutput->out) {
// Memory alloctation failed.
return FALSE;
}
// Copy existing chars over into larger array.
// Fill remaining cells with whitespace.
for (i = 0; i < pOutput->size; i++) {
if (i < pOutput->pos) {
pOutput->out[i] = tmp[i];
} else {
pOutput->out[i] = ' ';
}
}
}
// Add new char and increment pos.
pOutput->out[pOutput->pos] = c;
pOutput->pos++;
return TRUE;
}