QImage

Xiangbuilder

QImage这么用不行吗？
望指点。

1. 
   
2. #include <qapplication.h>
   
3. #include <qimage.h>
   
4. #include <qstring.h>
   
5. 
   
6. int main (int argc, char** argv) {
   
7.    QApplication app (argc, argv);
   
8. 
   
9.    QString fn="tao.png";
   
10.    QImage ima (fn);
    
11. 
    
12.    app.setMainWidget (&ima);   // line11
    
13.    ima.show ();
    
14.    return app.exec ();
    
15. }
    

复制代码

[root@localhost image]# make
g++ -c -pipe -Wall -W -O2 -g -pipe -march=i386 -mcpu=i686 -fno-use-cxa-atexit -fno-exceptions  -DQT_NO_DEBUG -I/usr/lib/qt-3.1/mkspecs/default -I. -I. -I/usr/lib/qt-3.1/include -o main.o main.cpp
main.cpp: In function `int main(int, char**)':
main.cpp:11: error: no matching function for call to `QApplication::
   setMainWidget(QImage*)'
/usr/lib/qt-3.1/include/qapplication.h:119: error: candidates are: virtual void
   QApplication::setMainWidget(QWidget*)
main.cpp:12: error: `show' undeclared (first use this function)
main.cpp:12: error: (Each undeclared identifier is reported only once for each
   function it appears in.)
make: *** [main.o] Error 1
[root@localhost image]#

cavendish

app.setMainWidget (&ima);
setMainWidget需要QWidget及子类
QImage显然不是
多看看文档，尤其是C++吧