Hier mal der Code.

------------------------main.cpp-------------------

#include "stdafx.h"

#include <cstdlib>
#include <iostream>
#include "terminal.h"
using namespace std;

int main(int argc, char *argv[])
{
    SECURITY_ATTRIBUTES sa;
    sa.nLength=sizeof(sa);
    terminal t;
    t.setPipes();
    t.initizilize(TERMINAL_HIDDEN);

    t.cleanup();

    system("PAUSE");
    return EXIT_SUCCESS;
}

--------terminal.h------------------

#ifndef terminal_h_
#define terminal_h_
#endif
#define TERMINAL_HIDDEN 1
#define TERMINAL_PUBLIC 0
#include "stdafx.h"
#include <windows.h>
#include <iostream>
#include <string.h>
class terminal
{
private:
        std::string error;
        SECURITY_ATTRIBUTES sa;

		SECURITY_DESCRIPTOR sd;
		HANDLE newstdin,newstdout,hwrite,hread;      
public:
       terminal()
	   {

	   };
       int setPipes()
       {
       InitializeSecurityDescriptor(&sd,SECURITY_DESCRIPTOR_REVISION);
       SetSecurityDescriptorDacl(&sd, true, NULL, false);
       sa.lpSecurityDescriptor = &sd;
       sa.nLength=sizeof(sa);
       sa.bInheritHandle=true;
       std::cout<<"hello"<<std::endl;
       if(!CreatePipe(&newstdin,&hwrite,&sa,0))
       {
		   error="";
           error="Could not Create InputPipe";
           return 0;
		}
        if(!CreatePipe(&newstdout,&hread,&sa,0))
        {
		error="";
		error="Could not Create OutputPipe";
        return 0;
        }
        return 1;
       };

       int initizilize(int mode);
       void reporterror();

       void cleanup();
       ~terminal()
	   {
	   };

};

---------------------terminal.cpp-----------------

#include "stdafx.h"
#include "terminal.h"
int terminal::initizilize(int mode)
{

     if(mode==1)
     {
		 STARTUPINFO si;
		 GetStartupInfo(&si);
		 si.dwFlags=STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
		 si.wShowWindow=SW_HIDE;
		 si.hStdError=terminal::newstdout;
		 si.hStdOutput=terminal::newstdout;
		 si.hStdInput=terminal::newstdin;

		//Hier kommt der Fehler
 CreateProcess(L"HALLO",NULL,NULL,NULL,true,CREATE_NEW_CONSOLE,NULL,NULL,&si,NULL);

        std::cout<<"Terminal runs in HIDDEN MODE"<<std::endl;
     }
	 return 1;
};

void terminal::reporterror()
{
    std::cout<<terminal::error.c_str()<<std::endl;
}
void terminal::cleanup()
{
     CloseHandle(terminal::newstdin);
     CloseHandle(terminal::newstdout);
     CloseHandle(terminal::hread);
     CloseHandle(terminal::hwrite);
};

Ich hoffe ihr könnt mir helfen