问控制台模拟器与Win32控制台API的不一致行为

EN

#include <windows.h>
#include <io.h>
#include <conio.h>
#include <fileapi.h>

#include <assert.h>
#include <stdio.h>

typedef struct {
  HANDLE h;
  HANDLE hin;
  WORD savedAttr;
} Terminal;

#define FOREGROUND_RGB (FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN)
#define BACKGROUND_RGB (BACKGROUND_RED | BACKGROUND_BLUE | BACKGROUND_GREEN)
#define TRY_OS(expr) if ((expr) == 0) { osError(); }
#define TRY_OR(expr) if ((expr) == 0)

static WORD get_text_attributes(Terminal term)
{
  CONSOLE_SCREEN_BUFFER_INFO c;

  TRY_OR(GetConsoleScreenBufferInfo(term.h, &c)) {
    return 0x70;
  }

  return c.wAttributes;
}

Terminal getHandle(FILE* in, FILE* out)
{
  Terminal term;

  if ((in == stdin) && (out == stdout)) {
    // grab the current console even if stdin/stdout have been redirected
    term.h =
        CreateFile("CON", GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
                   0, 0);
    term.hin =
        CreateFile("CON", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0,
                   0);
    // term.h = GetStdHandle(STD_OUTPUT_HANDLE);
    // term.hin = GetStdHandle(STD_INPUT_HANDLE);
  } else {
    term.h = (HANDLE) _get_osfhandle(_fileno(out));
    term.hin = (HANDLE) _get_osfhandle(_fileno(in));
  }

  term.savedAttr = get_text_attributes(term);
  return term;
}

void setFG(Terminal term, int color)
{
  WORD attr = get_text_attributes(term);
  attr &= ~FOREGROUND_RGB;  // clear FG color
  attr &= ~FOREGROUND_INTENSITY;  // clear FG intensity
  attr |= color;

  SetConsoleTextAttribute(term.h, attr);
}

void setBG(Terminal term, int color)
{
  WORD attr = get_text_attributes(term);
  attr &= ~BACKGROUND_RGB;  // clear BG color
  attr &= ~BACKGROUND_INTENSITY;  // clear BG intensity
  attr |= color;

  SetConsoleTextAttribute(term.h, attr);
}

int main()
{
  Terminal term = getHandle(stdin, stdout);

  setFG(term, FOREGROUND_RED);
  WriteConsole(term.h, "Hello, ", 7, NULL, NULL);

  setFG(term, FOREGROUND_BLUE);
  WriteConsole(term.h, "World !\r\n", 9, NULL, NULL);

  // reset style
  SetConsoleTextAttribute(term.h, term.savedAttr);

  return 0;
}