collect: ld returned 1 exit status 问题

xiaoxinhe1989 — Sat, 17 Mar 2012 08:39:00 GMT

collect: ld returned 1 exit status
问题：如果有自定义的类，类中定义了构造函数，和析构函数时，请注意析构函数声明了，记得定义，如果不想麻烦，在定义时可以：
1 #ifndef MYCONFIG_H
2 #define MYCONFIG_H
3
4
5 #include <QtGui/QWidget>
6 #include <QLabel>
7 #include <QLineEdit>
8
9
10 class MyPage1 : public QWidget
11 {
12     Q_OBJECT
13
14 public:
15     MyPage1(QWidget *parent = 0);
16     ~MyPage1(){};
17     QLabel *NameLabel,*HeightLabel,*NumLabel,*QuotationLabel;
18     QLineEdit *NameEdit,*HeightEdit,*NumEdit,*QuotationEdit;
19 };
20
21 class MyPage2 : public QWidget
22 {
23     Q_OBJECT
24
25 public:
26     MyPage2(QWidget *parent = 0);
27     ~MyPage2(){};
28
29 };
30 class MyPage3 : public QWidget
31 {
32     Q_OBJECT
33
34 public:
35     MyPage3(QWidget *parent = 0);
36     ~MyPage3(){};
37
38 };
39 #endif // MYCONFIG_H

xiaoxinhe1989 2012-03-17 16:39 发表评论

关于QPixmap

xiaoxinhe1989 — Sun, 11 Mar 2012 06:25:00 GMT

#include "windows.h"

#include

windows::windows(QWidget *parent)

: QWidget(parent)

{

resize(800,600);

pixmap = QPixmap(100,50);

background = QPixmap("background.bmp");

x = -1;

y = -1;

}

windows::~windows()

{

}

void windows::mouseMoveEvent(QMouseEvent *event){

x = event->x();

y = event->y();

pixmap.fill(QColor(255,255,255,127));

QPainter painter(&pixmap);

painter.setPen(QColor(255,0,0));

painter.drawText(20,40,QString("%1").arg(x) + "," + QString("%1").arg(y));

update();

}

void windows::paintEvent(QPaintEvent *event){

QPainter painter(this);

painter.drawPixmap(0,0,background);

painter.drawPixmap(x,y,pixmap);

}

xiaoxinhe1989 2012-03-11 14:25 发表评论

C++博客-C++

collect: ld returned 1 exit status 问题

关于QPixmap