Wysyłanie pliku na serwer

Przy uruchamianiu pliku upload.exe cały czas otrzymuję komunikat please select a file zapewne nie otrzymuje POST jako upload $_FILES['upload'] tylko nie wiem jak to zrobić w C++

Plik upload.cpp

#include <winsock2.h>
#include <windows.h>
#include <iostream>

using namespace std;
int main (){
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0) {
        cout << "WSAStartup failed.\n";
        return 1;
    }
    SOCKET Socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    struct hostent *host;
    host = gethostbyname("localhost");
    SOCKADDR_IN SockAddr;
    SockAddr.sin_port=htons(80);
    SockAddr.sin_family=AF_INET;
    SockAddr.sin_addr.s_addr = *((unsigned long*)host->h_addr);
    cout << "Connecting...\n";
    if(connect(Socket,(SOCKADDR*)(&SockAddr),sizeof(SockAddr)) != 0){
        cout << "Could not connect";
        return 1;
    }
    cout << "Connected.\n";
	char *header="POST /upload.php HTTP/1.1\r\n"
      "Host: localhost\r\n"
      "Content-Type: multipart/form-data; boundary=myboundary\r\n"
      "Connection: close\r\n"
      "\r\n"
      "--myboundary\r\n"
      "Content-Type: application/octet-stream\r\n"
      "Content-Disposition: form-data; name=\"file\"; filename=\"C:\\Users\\User\\Downloads\\file.txt\"\r\n"
      "Content-Transfer-Encoding: 8bit\r\n"
      "\r\n";
	send(Socket,header, strlen(header),0);
    char buffer[100000];
    int nDataLength;
    while ((nDataLength = recv(Socket,buffer,100000,0)) > 0){        
        int i = 0;
        while (buffer[i] >= 32 || buffer[i] == '\n' || buffer[i] == '\r') {
            cout << buffer[i];
            i += 1;
        }
    }
    closesocket(Socket);
        WSACleanup();
    return 0;
}

Plik upload.php

 <?php
$uploaddir = '/upload';
$uploadfile = $uploaddir . basename($_FILES['upload']['name']);

if(!isset($_FILES['upload'])) {
    echo "Please select a file\n";
} else {
	if (move_uploaded_file($_FILES['uploadedFile']['tmp_name'], $uploadFile)) { 
		echo "File is valid, and was successfully uploaded.\n";
	} else {
		echo "Possible file upload attack!\n";
	}

	echo 'Here is some more debugging info:';
	print_r($_FILES);
}
?>