c++ - How to WriteConsoleInput to the a child app waiting at ReadConsoleInput? -

so have been attempting read , write pianobar (console pandora player) stdin , stdout control within application.

however, when reading stdout blocks @ last line (where displays time of song).

i thought doing wrong (probably still am) downloaded demo project sending/receiving input applications stdin/stdout via couple handles.

so dove pianobar code, , put in printf commands on place trace block occurring (is block right word this?) anyways section of code appears loop extremely when created child process, , blocks stdout.

from pianobar, ui_readline.c barreadline replacement

/*  readline replacement  *  @param buffer  *  @param buffer size  *  @param accept these characters  *  @param input fds  *  @param flags  *  @param timeout (seconds) or -1 (no timeout)  *  @return number of bytes read stdin  */ size_t barreadline (char *buf, const size_t bufsize, const char *mask,         barreadlinefds_t *input, const barreadlineflags_t flags, int timeout) { // took out code here ... printf("in barreadline 005\n"); fflush(stdout); while (true) {     sleep(400); // added stop doing 100% on core     printf("in barreadline 006\n");     fflush(stdout);     if (timeout != infinite) {         dword = gettickcount ();         printf("in barreadline 007\n");         fflush(stdout);         if ((int)(now - timestamp) < timeout) {             timeout -= (int)(now - timestamp);             timestamp = now;         }         else             timeout = 150; // kyle changed 0     }     printf("current timeout: %d\n",timeout);     printf("in barreadline 008\n");     fflush(stdout);     waitresult = waitforsingleobject (handle, timeout);      printf("in barreadline 009\n");     fflush(stdout);     if (wait_object_0 == waitresult) {         input_record inputrecords[8];         input_record* record;         dword recordsread, i;          printf("in barreadline 010\n");         fflush(stdout);         successconsole = readconsoleinput (handle, inputrecords, sizeof(inputrecords) / sizeof(*inputrecords), &recordsread);         if(successconsole != 0) {             printf("we read console\n");         }          printf("in barreadline 011\n");         fflush(stdout);         (i = 0, record = inputrecords; < recordsread; ++i, ++record) {             int codepoint, keycode;              printf("in barreadline 012\n");             fflush(stdout); 

and code above prints out:

in barreadline 005 in barreadline 006 in barreadline 007 current timeout: 150 in barreadline 008 in barreadline 009 in barreadline 010 in barreadline 011 in barreadline 006 in barreadline 007 current timeout: 150 in barreadline 008 in barreadline 009 in barreadline 010 in barreadline 011  

anyways, can bash "input" key on redirect demo app known key doesn't require special , keeps spinning through loop , doesn't seem catch it, me sounds 1 of 2 things; don't have access input function being blocked reading of stdout, or readconsoleinput isn't recognizing things send redirect demo.

is need send type of async i/o process? , why using "cmd" , opening regular command prompt not cause blocking, does?

update 1: managed build input_record send readconsoleinput within pianobar (child console). however, i'm finding parent application returning "invalid handle" when try send writeconsoleinput(m_hstdinwrite, inputrecords, sizeof(inputrecords) / sizeof(*inputrecords), &dwwritten);

are there different types of handles child's console stdin? using writefile works, cannot send input_records way.

redirect demo app

pianobar windows binaries

pianobar windows build environment

helped, not sure what's causing invalid handle: low level console input , redirection

i believe because program using readconsoleinput instead of readfile. readconsoleinput requires console handle.

you need create console , pass handle. you'd need write console input events it.

it'd better if change other program use readfile, if make work.

this seems msdn reference consoles.