ERROR.C
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/*-----------------------------------------------------------------------------
This is a part of the Microsoft Source Code Samples.
Copyright (C) 1995 Microsoft Corporation.
All rights reserved.
This source code is only intended as a supplement to
Microsoft Development Tools and/or WinHelp documentation.
See these sources for detailed information regarding the
Microsoft samples programs.
MODULE: Error.c
PURPOSE: Implement error handling functions
called to report errors.
FUNCTIONS:
ErrorExtender - Calls FormatMessage to translate error code to
error text
ErrorReporter - Reports errors to user
ErrorHandler - Reports errors, then exits the process
ErrorInComm - Reports errors, closes comm connection, then exits
-----------------------------------------------------------------------------*/
#include <windows.h>
#include "mttty.h"
/*
Prototypes of functions called only in this module
*/
DWORD ErrorExtender(DWORD, char **);
/*-----------------------------------------------------------------------------
FUNCTION: ErrorExtender(DWORD, char **)
PURPOSE: Translates error codes into error strings
PARAMETERS:
dwError - error code to be translated
szBuffer - pointer to error string buffer
COMMENTS: If code can't be translated, then a 1 byte NULL string
created. The buffer, whether created by FormatMessage, or
directly is supposed to be freed by the caller.
HISTORY: Date: Author: Comment:
10/27/95 AllenD Wrote it
-----------------------------------------------------------------------------*/
DWORD ErrorExtender(DWORD dwError, char ** szBuffer)
{
DWORD dwRes = 0;
dwRes = FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | 80 ,
NULL, dwError,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(LPTSTR) szBuffer, 0, NULL);
if (dwRes == 0) {
*szBuffer = LocalAlloc(LPTR, 1);
return 1;
}
return dwRes;
}
/*-----------------------------------------------------------------------------
FUNCTION: ErrorReporter(char *)
PURPOSE: Report error to user
PARAMETERS:
szMessage - Error message from app
COMMENTS: Reports error string in console and in debugger
HISTORY: Date: Author: Comment:
10/27/95 AllenD Wrote it
-----------------------------------------------------------------------------*/
void ErrorReporter(char * szMessage)
{
char * szFormat = "Error %d: %s.\n\r%s\r\n"; // format for wsprintf
char * szExtended; // error string translated from error code
char * szFinal; // final string to report
DWORD dwExtSize;
DWORD dwErr;
dwErr = GetLastError();
/* Get error string from system */
dwExtSize = ErrorExtender(dwErr, &szExtended);
/* allocate buffer for error string from system, passed in string and extra stuff from the szFormat string */
szFinal = LocalAlloc(LPTR, strlen(szMessage) +dwExtSize + 30);
if (szFinal == NULL) // if no final buffer, then can't format error
{
TTYInfo.rgbBGColor = RGB(255, 50, 50);
OutputABuffer("Cannot properly report error. \r\n");
//MessageBox(ghwndMain, "Cannot properly report error.", "Fatal Error", MB_OK);
}
else
{
wsprintf(szFinal, szFormat, dwErr, szMessage, szExtended);
OutputDebugString(szFinal);
if (DISPLAYERRORS(TTYInfo))
{
TTYInfo.rgbBGColor = RGB(255, 50, 50);
OutputABuffer(szFinal);
//MessageBox(ghwndMain, szFinal, NULL, MB_OK);
}
LocalFree(szFinal); // free final buffer
}
/* free extended string buffer */
LocalFree(szExtended);
return;
}
/*-----------------------------------------------------------------------------
FUNCTION: ErrorHandler( char * )
PURPOSE: Handle a fatal error (before comm port is opened)
PARAMETERS:
szMessage - Error message from app
HISTORY: Date: Author: Comment:
10/27/95 AllenD Wrote it
-----------------------------------------------------------------------------*/
void ErrorHandler(char * szMessage)
{
ErrorReporter(szMessage);
ExitProcess(0);
}
/*-----------------------------------------------------------------------------
FUNCTION: ErrorInComm( char * )
PURPOSE: Handle a fatal error after comm port is opened
PARAMETERS:
szMessage - Error message from app
HISTORY: Date: Author: Comment:
10/27/95 AllenD Wrote it
-----------------------------------------------------------------------------*/
void ErrorInComm(char * szMessage)
{
ErrorReporter(szMessage);
BreakDownCommPort();
ExitProcess(0);
}