CmingwWindowsConsoleVirtualTerminalSequencesvsWindowsConsoleAPI-获取给定行中的字符数

对于使用 Virtual Terminal Sequences 来计算给定行中的字符数的情况，可以采用以下代码：

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

#define ESC '\033'

// Virtual Terminal Sequence: ESC[6n -> Query Cursor Position
#define VT100_QUERY_POSITION_SEQ ESC "[6n"

// Virtual Terminal Sequence: ESC[#n -> Set Mode
#define VT100_SET_MODE_SEQ(mode) ESC "[" #mode "m"

// Virtual Terminal Sequence: ESC[?#n -> Private Mode Set
#define VT100_SET_PRIVATE_MODE_SEQ(mode) ESC "[?" #mode "h"
#define VT100_RESET_PRIVATE_MODE_SEQ(mode) ESC "[?" #mode "l"

void enable_virtual_terminal_mode(HANDLE hConsoleOutput) {
    DWORD dwMode = 0;
    GetConsoleMode(hConsoleOutput, &dwMode);
    dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
    SetConsoleMode(hConsoleOutput, dwMode);
}

void disable_virtual_terminal_mode(HANDLE hConsoleOutput) {
    DWORD dwMode = 0;
    GetConsoleMode(hConsoleOutput, &dwMode);
    dwMode &= ~ENABLE_VIRTUAL_TERMINAL_PROCESSING;
    SetConsoleMode(hConsoleOutput, dwMode);
}

int get_number_of_characters_on_line(int line) {
    HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
    enable_virtual_terminal_mode(hStdOut);
    DWORD dwOriginalMode = 0;
    GetConsoleMode(hStdOut, &dwOriginalMode);
    SetConsoleMode(hStdOut, dwOriginalMode | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
    HANDLE hConsoleInput = GetStdHandle(STD_INPUT_HANDLE);
    COORD coord;
    DWORD cCharsWritten;
    WriteConsole(hStdOut, VT100_SET_MODE_SEQ(4), 4, &cCharsWritten, NULL);
    WriteConsole(hStdOut, VT100_QUERY_POSITION_SEQ, sizeof(VT100_QUERY_POSITION_SEQ), &cCharsWritten, NULL);
    char buf[128];
    DWORD dwRead = 0;
    if (ReadConsoleInput(hConsoleInput, (PINPUT_RECORD)buf, sizeof(buf) / sizeof(INPUT_RECORD), &dwRead)) {
        for (int i = 0; i < dwRead; i++) {
            if (buf[i].EventType == KEY_EVENT) {
                COORD coordPosition = buf[i].Event.KeyEvent.dwCursorPosition;
                int linePosition = coordPosition.Y + 1;
                if (linePosition == line) {
                    return coordPosition.X;
                }
            }
        }
    }
    SetConsoleMode(hStdOut, dwOriginalMode);
    disable_virtual_terminal_mode(hStdOut);
    return -1;
}

int main(int argc, char* argv[]) {
    for (int i = 1; i <= 10; i++) {
        printf("%d: Number of characters on line %d -> %d\n", i, i, get_number_of_characters_on_line(i));
    }

    return 0;
}

使用 Virtual Terminal Sequences 可以通过发送光标位置查询序列（ESC[6n）并读取输入缓冲区中的 KEY_EVENT 类型来获取行中的字符数。

而对于使用 Windows Console API 来计算给定行中的字符数的情况，可以采用以下代码：

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

int get_number_of_characters_on_line(int line) {
    HANDLE hConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    if (!GetConsoleScreenBufferInfo(hConsole