从 Windows bat 文件并行调用多个 .exe 文件并将结果传输到一个公共文件？

Question

我想要一个标准的 Windows .bat 文件并行调用一个 .exe 文件的 3 个实例，并将结果通过管道传输到一个通用文本文件。伪代码：

SET PATH_TO_OUTPUT_FILE=%~dp0"All Devices Contents.txt"

echo Device on COM1 returned the following: >  %PATH_TO_OUTPUT_FILE%
start /b  ReadFromComPortDevice.exe  COM1   >> %PATH_TO_OUTPUT_FILE%
echo Device on COM2 returned the following: >> %PATH_TO_OUTPUT_FILE%
start /b  ReadFromComPortDevice.exe  COM2   >> %PATH_TO_OUTPUT_FILE%
echo Device on COM3 returned the following: >> %PATH_TO_OUTPUT_FILE%
start /b  ReadFromComPortDevice.exe  COM3   >> %PATH_TO_OUTPUT_FILE%

显然，上述操作会产生文件访问错误，因为该文件已被第一个进程使用。有人知道解决方法吗？

Answer 1

最简单的方法是将整个批处理文件的输出重定向到指定文件：

@Echo off & CD /D "%~dp0"

If not defined _ (
 Set _=_
 Prompt $_
 Start /B "" "%~f0" >"All Devices Contents.txt"
 (Prompt )
 Exit /B
)

echo Device on COM1 returned the following:
start /b  ReadFromComPortDevice.exe  COM1
echo Device on COM2 returned the following:
start /b  ReadFromComPortDevice.exe  COM2
echo Device on COM3 returned the following:
start /b  ReadFromComPortDevice.exe  COM3

Set "_="
Goto :Eof

Answer 2

以下内容的顺序似乎是正确的：

echo Device on COM1 returned the following: >   TempCom1.txt
start /b  ReadFromComPortDevice.exe  COM1   >>  TempCom1.txt
echo Device on COM2 returned the following: >   TempCom2.txt
start /b  ReadFromComPortDevice.exe  COM2   >>  TempCom2.txt
echo Device on COM3 returned the following: >   TempCom3.txt
start /b  ReadFromComPortDevice.exe  COM3   >>  TempCom3.txt

call:waitForFileUnlocked TempCom1.txt
call:waitForFileUnlocked TempCom2.txt
call:waitForFileUnlocked TempCom3.txt

copy TempCom1.txt+TempCom2.txt+TempCom3.txt    "All Devices Contents.txt"

call:waitForFileUnlocked TempCom1.txt
call:waitForFileUnlocked TempCom2.txt
call:waitForFileUnlocked TempCom3.txt

del "TempCom1.txt"
del "TempCom2.txt"
del "TempCom3.txt"

pause

:waitForFileUnlocked
@echo off
:Wait
2>nul (
  >>%~1 echo off
) && (echo ) || goto :Wait
goto:eof