[英]null pointer in opencv (QT) when running
Hello i have a Macbook pro with osx 10.7. 您好,我有一个Macbook Pro,带有osx 10.7。 I just installed Qt (nokia), opencv, cmake. 我刚刚安装了Qt(诺基亚),opencv,cmake。 I have never worked with any of those . 我从未与任何人合作过。 So i started my first tutorial. 所以我开始了我的第一个教程。 I created a new QT Gui application. 我创建了一个新的QT Gui应用程序。 I changed my main.cpp to : 我将main.cpp更改为:
#include <QtGui/QApplication>
#include <opencv/cv.h>
#include <opencv/highgui.h>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
IplImage* img = 0;
img = cvLoadImage("cat.jpg");
cvNamedWindow("Example1", CV_WINDOW_AUTOSIZE);
cvShowImage("Example1", img);
cvWaitKey(0);
cvReleaseImage(&img);
cvDestroyWindow("Example1");
return a.exec();
} }
I also changed my .pro file: 我还更改了.pro文件:
QT += core gui
TARGET = untitled1
TEMPLATE = app
INCLUDEPATH = /usr/local/include
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
LIBS += -lm -lopencv_core -lopencv_highgui -lopencv_video -lopencv_imgproc
FORMS += mainwindow.ui
for the rest : 对于其余的 :
the cat.jpg is in the qt project folder (next to main.cpp) cat.jpg位于qt项目文件夹(位于main.cpp旁边)
Now when i build this and run it. 现在,当我构建并运行它时。 i get this error: 我收到此错误:
Starting /Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/untitled1.app/Contents/MacOS/untitled1...
OpenCV Error: Null pointer (NULL array pointer is passed) in cvGetMat, file /Users/olivierjanssens/source/OpenCV-2.3.1/modules/core/src/array.cpp, line 2382
terminate called throwing an exceptionThe program has unexpectedly finished.
/Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/untitled1.app/Contents/MacOS/untitled1 exited with code 0
The window opens but then it crashes and no image is shown. 窗口打开,但随后崩溃,没有图像显示。
What am i doing wrong ? 我究竟做错了什么 ?
cat.jpg
is probably not in the right directory. cat.jpg
可能不在正确的目录中。
If you don't supply a path it searches the current directory, which is probably /Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug
or /Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/untitled1.app/Contents/MacOS
. 如果您没有提供路径,它将搜索当前目录,该目录可能是/Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug
/Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/untitled1.app/Contents/MacOS
或/Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug
/Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/untitled1.app/Contents/MacOS
或/Users/olivierjanssens/untitled1-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/untitled1.app/Contents/MacOS
。 The directory with main.cpp
in it isn't searched. 不搜索包含main.cpp
的目录。
Try supplying a full path to cvLoadImage()
(something like "/Users/olivierjanssens/untitled1/cat.jpg"
) 尝试提供"/Users/olivierjanssens/untitled1/cat.jpg"
cvLoadImage()
的完整路径(例如"/Users/olivierjanssens/untitled1/cat.jpg"
)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.