READCHAR.C

/******************************************************************************\ 
*       This is a part of the Microsoft Source Code Samples.  
*       Copyright 1993 - 1998 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. 
\******************************************************************************/ 
 
#include <windows.h> 
#include <string.h> 
#include <malloc.h> 
#include "console.h" 
 
/********************************************************************* 
* FUNCTION: demoReadConChar(HANDLE hConOut)                          * 
*                                                                    * 
* PURPOSE: demonstrate ReadConsoleOutputCharacter. Read the text on  * 
*          line that the user clicks on and output it to the console * 
*                                                                    * 
* INPUT: the console output handle to write to                       * 
*********************************************************************/ 
 
void demoReadConChar(HANDLE hConOut) 
{ 
  BOOL bSuccess; 
  INPUT_RECORD inputBuffer; 
  DWORD dwStdInMode; 
  HANDLE hStdIn; 
  DWORD dwInputEvents; 
  COORD coordLine; /* coordinates of where to read characters from */ 
  CHAR *szLine;  /* buffer to hold the line read from the console */ 
  DWORD dwCharsRead; 
  int i; 
 
  setConTitle(__FILE__); 
  myPuts(hConOut, "Click on any line containing characters. I will use\n" 
                  "ReadConsoleOutputCharacter to read that line of text into\n" 
                  "a buffer, then print that buffer to the console at the\n" 
                  "current cursor position. Hit ESC to return.\n\n"); 
  hStdIn = GetStdHandle(STD_INPUT_HANDLE); 
  PERR(hStdIn != INVALID_HANDLE_VALUE, "GetStdHandle"); 
  /* save the console mode */ 
  bSuccess = GetConsoleMode(hStdIn, &dwStdInMode); 
  PERR(bSuccess, "GetConsoleMode"); 
  /* enable mouse input */ 
  bSuccess = SetConsoleMode(hStdIn, dwStdInMode | ENABLE_MOUSE_INPUT); 
  PERR(bSuccess, "SetConsoleMode"); 
  /* allocate space for one line */ 
  szLine = (char *) malloc(getConX(hConOut)); 
  PERR(szLine, "malloc"); 
  for(;;) 
    { 
    /* get a single input event */ 
    bSuccess = ReadConsoleInput(hStdIn, &inputBuffer, 1, &dwInputEvents); 
    PERR(bSuccess, "ReadConsoleInput"); 
    switch (inputBuffer.EventType) 
      { 
      case KEY_EVENT: 
        /* is it an ESC key? */ 
        if (inputBuffer.Event.KeyEvent.bKeyDown && 
            inputBuffer.Event.KeyEvent.wVirtualKeyCode == VK_ESCAPE) 
          { 
          /* set input mode back to what it was originally and return */ 
          bSuccess = SetConsoleMode(hStdIn, dwStdInMode); 
          PERR(bSuccess, "SetConsoleMode"); 
          free(szLine); /* free allocated space for a text line */ 
          return; 
          } 
        break; 
      case MOUSE_EVENT: 
        /* was this was a click event? Is any button down or not? */ 
        if (inputBuffer.Event.MouseEvent.dwEventFlags != MOUSE_MOVED && 
            inputBuffer.Event.MouseEvent.dwButtonState) 
          { 
          /* read the line where the mouse is, starting at column 0 */ 
          coordLine.X = 0; 
          coordLine.Y = inputBuffer.Event.MouseEvent.dwMousePosition.Y; 
          bSuccess = ReadConsoleOutputCharacter(hConOut, szLine, 
              getConX(hConOut), coordLine, &dwCharsRead); 
          PERR(bSuccess, "ReadConsoleOutputCharacter"); 
          /* strip trailing spaces */ 
          i = getConX(hConOut) - 1; 
          szLine[i--] = 0; /* null terminate */ 
          while (szLine[i] == ' ') 
            szLine[i--] = 0; 
          myPuts(hConOut, szLine); 
          } 
      } /* switch */ 
    } /* while */ 
}