为什么我不能重定向WriteConsole的输出? [英] Why can't I redirect output from WriteConsole?

问题描述

在以下程序中，我使用两种不同的功能打印到控制台

In the following program I print to the console using two different functions

#include <windows.h>

int main() {
    HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE);
    DWORD byteswritten;
    WriteConsole(h, "WriteConsole", 12, &byteswritten, NULL);
    WriteFile(h, "WriteFile", 9, &byteswritten, NULL);
}

如果我执行此程序并使用 a>重定向它的输出，out.txt 或 a 1>out.txt 没有任何内容打印到控制台(按预期)，但是 out.txt 的内容仅为

If when I execute this program and redirect it's output using a > out.txt or a 1> out.txt nothing gets printed to the console (as expected) but the contents of out.txt are only

WriteFile

两者之间的不同之处在于，它们允许将对 WriteFile 的调用重定向到该文件，并将对 WriteConsole 的调用转到...无处

What is different between the two that allows calls to WriteFile to be redirected to the file and calls to WriteConsole to go to ... nowhere

在Windows 10上使用gcc和msvc进行了测试

Tested with gcc and msvc on windows 10

推荐答案

WriteConsole 仅适用于控制台屏幕手柄，不适用于文件或管道.

WriteConsole only works with console screen handles, not files nor pipes.

如果仅编写ASCII内容，则可以使用 WriteFile 进行所有操作.

If you are only writing ASCII content you can use WriteFile for everything.

如果您需要编写Unicode字符，则可以使用 GetConsoleMode 来检测句柄类型，对于不是控制台句柄的所有内容，它都会失败.

If you need to write Unicode characters you can use GetConsoleMode to detect the handle type, it fails for everything that is not a console handle.

在进行这样的原始输出时，如果句柄是，则还必须处理 BOM 重定向到文件.

When doing raw output like this you also have to deal with the BOM if the handle is redirected to a file.

此博客文章是一个很好的起点在Windows控制台中处理Unicode ...

This blog post is a good starting point for dealing with Unicode in the Windows console...

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