wxWidgets中如何使用输入输出重定向调用外部程序

网上先是搜索到此篇文章: http://hi.baidu.com/xxai/blog/item/035f2bad22331d0b4a36d6ee.html

程序是被成功调用了.但没有获取到输出.搜索wxWidgets的exec例程.
发现需要自己实现OnTerminate函数来捕获输出. OnTerminate会在应用程序执行完毕后被调用.

#include <wx/process.h>
class MyProcess : public wxProcess
{
public:
    MyProcess():  wxProcess()
        {
            Redirect(); //在构架函数里面直接设置输出重定向.
        }

    // instead of overriding this virtual function we might as well process the
    // event from it in the frame class - this might be more convenient in some
    // cases
    virtual void OnTerminate(int pid, int status);
};

void MyProcess::OnTerminate(int pid, int status)
{
#define READ_LEN 256

    if ( IsInputAvailable() )
    {
        wxInputStream * ResultStream = GetInputStream();

        if( ResultStream != NULL )
        {
            wxString result = _("");
            char read_buffer[READ_LEN];

            while( 1 )
            {
                ResultStream->Read(read_buffer,READ_LEN-1); /**< 最后至少要留空一个字节用于放置 \0 */
                size_t byte_read = ResultStream->LastRead();
                if( byte_read == 0 )
                {
                    break;
                }
                read_buffer[byte_read] = '\0'; /**< 在最后插入一个字符结束符 */
                result += wxString(read_buffer, wxCSConv(wxT("gb2312"))); /**< 编码转换 */
            }
            /**< 向文本框输出字符 */
        }
    }

    if ( IsErrorAvailable() )
    {
        terminal->AppendText(_("---- error ----\r\n"));
        wxInputStream * ResultStream = GetErrorStream();

        if( ResultStream != NULL )
        {
            wxString result = _("");
            char read_buffer[READ_LEN];

            while( 1 )
            {
                ResultStream->Read(read_buffer,READ_LEN-1); /**< 最后至少要留空一个字节用于放置 \0 */
                size_t byte_read = ResultStream->LastRead();
                if( byte_read == 0 )
                {
                    break;
                }
                read_buffer[byte_read] = '\0'; /**< 在最后插入一个字符结束符 */
                result += wxString(read_buffer, wxCSConv(wxT("gb2312"))); /**< 编码转换 */
            }
            /**< 向文本框输出字符 */
        }
    }
}

MyProcess * pMyProcess = new MyProcess();
wxString cmd = _("cmd /c ver ");
wxExecute(cmd,wxEXEC_ASYNC,pMyProcess); // 启动外部程序