How can I redirect stdout to some visible display in a Windows Application?

You need to create pipe (with CreatePipe()), then attach stdout to it's write end with SetStdHandle(), then you can read from pipe's read end with ReadFile() and put text you get from there anywhere you like.

You can redirect stdout, stderr and stdin using freopen.

From the above link:

/* freopen example: redirecting stdout */#include <stdio.h>int main (){  freopen ("myfile.txt","w",stdout);  printf ("This sentence is redirected to a file.");  fclose (stdout);  return 0;}

You can also run your program via command prompt like so:

a.exe > stdout.txt 2> stderr.txt

You're probably looking for something along those lines:

    #define OUT_BUFF_SIZE 512    int main(int argc, char* argv[])    {        printf("1: stdout\n");        StdOutRedirect stdoutRedirect(512);        stdoutRedirect.Start();        printf("2: redirected stdout\n");        stdoutRedirect.Stop();        printf("3: stdout\n");        stdoutRedirect.Start();        printf("4: redirected stdout\n");        stdoutRedirect.Stop();        printf("5: stdout\n");        char szBuffer[OUT_BUFF_SIZE];        int nOutRead = stdoutRedirect.GetBuffer(szBuffer,OUT_BUFF_SIZE);        if(nOutRead)            printf("Redirected outputs: \n%s\n",szBuffer);        return 0;    }

This class will do it:

#include <windows.h>#include <stdio.h>#include <fcntl.h>#include <io.h>#include <iostream>#ifndef _USE_OLD_IOSTREAMSusing namespace std;#endif#define READ_FD 0#define WRITE_FD 1#define CHECK(a) if ((a)!= 0) return -1;class StdOutRedirect{    public:        StdOutRedirect(int bufferSize);        ~StdOutRedirect();        int Start();        int Stop();        int GetBuffer(char *buffer, int size);    private:        int fdStdOutPipe[2];        int fdStdOut;};StdOutRedirect::~StdOutRedirect(){    _close(fdStdOut);    _close(fdStdOutPipe[WRITE_FD]);    _close(fdStdOutPipe[READ_FD]);}StdOutRedirect::StdOutRedirect(int bufferSize){    if (_pipe(fdStdOutPipe, bufferSize, O_TEXT)!=0)    {        //treat error eventually    }    fdStdOut = _dup(_fileno(stdout));}int StdOutRedirect::Start(){    fflush( stdout );    CHECK(_dup2(fdStdOutPipe[WRITE_FD], _fileno(stdout)));    ios::sync_with_stdio();    setvbuf( stdout, NULL, _IONBF, 0 ); // absolutely needed    return 0;}int StdOutRedirect::Stop(){    CHECK(_dup2(fdStdOut, _fileno(stdout)));    ios::sync_with_stdio();    return 0;}int StdOutRedirect::GetBuffer(char *buffer, int size){    int nOutRead = _read(fdStdOutPipe[READ_FD], buffer, size);    buffer[nOutRead] = '\0';    return nOutRead;}

Here's the result:

1: stdout3: stdout5: stdoutRedirected outputs:2: redirected stdout4: redirected stdout