php中的proc_open+fwrite应用有关问题

php中的proc_open+fwrite应用问题
我想在php用proc_open调用一个c++写的exe程序，由于里面有要求输入参数所以我用fwrite写入终端，php代码如下

PHP code

<!--

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--><?php $descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("file", "error-output.txt", "a") // stderr is a file to write to
);

$process = proc_open("d:\\64test.exe", $descriptorspec, $pipes);

if (is_resource($process)) {
    // $pipes now looks like this:
    // 0 => writeable handle connected to child stdin
    // 1 => readable handle connected to child stdout
    // Any error output will be appended to /tmp/error-output.txt
    
    fwrite($pipes[0], "q");
    fclose($pipes[0]);
    while (!feof($pipes[1])) 
    {
        $result = fgets($pipes[1], 1024);
        echo "r:$result<br>";
    }
    fclose($pipes[1]);
    
    // It is important that you close any pipes before calling
    // proc_close in order to avoid a deadlock
    $return_value = proc_close  ($process);

    echo "command returned $return_value<br>";
}
?>

c++代码如下

C/C++ code

<!--

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-->
#include <iostream>
using namespace std;
int main(int argc,char *argv[])
{
    char buf[1024]={0};
    /*fgets(buf,sizeof(buf),stdin);*/
    while(buf[0]!='q')
    {
        std::cin>>buf;
        std::cout</iostream>

上面的c++是简化的代码
(1)问题是我的c++中代码是个while循环要求持续的输入
问php中应该怎么写，现在的的php中只能fwrite($pipes[0], "q");，其它的就不行
(2)上面那段程序到能正常打印
r:q
command returned -3
我在另一个非常复杂的cpp程序去始终打印如下：
r:
command returned -1073741515
后来我在main中把其他的代码都注释掉直接复复制上面简单的c++代码到我的工程中结果还是上面的，这是我最纳闷的地方，有人遇到过么

求教高人，万分感谢

------解决方案--------------------
fwrite($pipes[0], "cmd1\ncmd2\ncmd3\nq"); 试试看
------解决方案--------------------
啥意思？
他让你将逐次输出的数据组装成串后一次性输出