【提问】使用QThread类中出现的问题 - QTCN开发网

离线xd1198

新手上路

只看楼主倒序阅读楼主发表于: 2005-10-09

— 本帖被 XChinux 从 General Qt Programming 移动到本区(2011-01-02) —

源代码如下：

复制代码

/* ***** thread.h ************/
#include <qthread.h>
//#include <unistd.h>
//#include "form1.h"
class MyThread : public QThread
{
public:
MyThread();
virtual void run();
~MyThread();
};
/************* thread.cpp **********/
#include "thread.h"
void MyThread::run()
{ while(1){
printf("123\n");
sleep(1);
printf("321\n");
sleep(1);
}
}[font=楷体_GB2312][/font]
MyThread::MyThread()
{
}
MyThread::~MyThread()
{ }

调试信息如下：
thread.h:6: parse error before `{' token
thread.h:9: virtual outside class declaration
thread.h:10: destructors must be member functions
thread.h:11: parse error before `}' token
thread.cpp:4: invalid use of undefined type `class MyThread'
thread.h:5: forward declaration of `class MyThread'
thread.cpp: In member function `void MyThread::run()':
thread.cpp:7: `sleep' undeclared (first use this function)
thread.cpp:7: (Each undeclared identifier is reported only once for each
function it appears in.)
thread.cpp: At global scope:
thread.cpp:14: invalid use of undefined type `class MyThread'
thread.h:5: forward declaration of `class MyThread'
thread.cpp:17: invalid use of undefined type `class MyThread'
thread.h:5: forward declaration of `class MyThread'

主要问题出在黑体的调试信息部分，
” class MyThread : public QThread “是第六行。为什么这里会出错了？假如我把QThread 换成QApplication 等别的类，此处的报错就会没有。
还有一个问题是：run在此处必须是virtual的吗？

[ 此贴被xd1198在2005-10-09 12:52重新编辑 ]