win7 boost::asio::windows::stream_handle constructor throws error

Question

The following code gets an error when trying to execute the last line

 boost::shared_ptr<boost::asio::io_service> ioServicePtr(new boost::asio::io_service());
 //setup the terminal with stdin and stdout

 int inFD = ::dup(STDIN_FILENO);

 int outFD = ::dup(STDOUT_FILENO);

 HANDLE osfhandle = (HANDLE)_get_osfhandle(inFD);//osfhandle is valid

 boost::asio::windows::stream_handle inputStream(*ioServicePtr, osfhandle); //error

the error is:

uncaught exception of type N5boost16exception_detail10clone_implINS0_19error_info_injectorINS_6system12system_errorEEEEE
- assign: The parameter is incorrect

Appreciate your input.

@sehe

I tried

hstdhandle = GetStdHandle(STD_OUTPUT_HANDLE);

and got the same error

So then I tried

HANDLE handle= 
CreateFile(
    "CONIN$", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 
    FILE_FLAG_OVERLAPPED, NULL);
boost::asio::windows::stream_handle inputStream(*ioServicePtr, handle);

and the error was

-assign handle invalid

score 3 · Accepted Answer · edited May 23 '17 at 12:10

You might use GetStdHandle, so:

HANDLE isfhandle = GetStdHandle(STD_INPUT_HANDLE);

However, I don't think consoles support asynchronous IO in windows:

The handle must be to an object that supports overlapped I/O.

If a handle is provided, it has to have been opened for overlapped I/O completion. For example, you must specify the FILE_FLAG_OVERLAPPED flag when using the CreateFile function to obtain the handle

But further the docs for CreateFile say that CreateFile ignores file flags when creating a handle to a console buffer.

So, you will need to emulate stdin/stdout async IO.

Note that on Linux, asynchronous IO to the standard IO handles is only possible in certain situations anyway - depending on the input/output being redirected: Strange exception throw - assign: Operation not permitted

win7 boost::asio::windows::stream_handle constructor throws error

1 Answers1