Qt Error Cannot Call Member Function Without Object
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Arduino Cannot Call Member Function Without Object
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Invalid Use Of Member In Static Member Function
void read_names(); void read_ages(); void print(); private: vector
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C++ Undefined Reference To
Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up My Qt code doesn't compile with “cannot call member http://stackoverflow.com/questions/1127738/cannot-call-member-function-without-object function without object” up vote 1 down vote favorite So i'm struggling to find a solution to this and don't know where i'm going wrong. I'm new to QT (today) and i'm not sure if i'm doing the right thing. I'm trying to create a GUI for an already created c program (an image scraper). The image scraper works but I am trying to implement the GUI http://stackoverflow.com/questions/22486878/my-qt-code-doesnt-compile-with-cannot-call-member-function-without-object which allows a user to input a website to scrape images from into a line edit box (lineEdit), and then on click of a push button (pushButton) it takes the input text from the line edit box and uses it as the argument to run the C program in the background. Except I can't get that far because of the issue mentioned above. Any assistance will be appreciated. Below is my code, the header and main files haven't been changed, and any changes that have been made have been done through the GUI designer over manual changes. #include "mainwindow.h" #include "ui_mainwindow.h" char *arguments; MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { QString program = "~/Desktop/IS"; QString arguments = QLineEdit::text(); //error on this line QProcess *myProcess = newQProcess(parent); myProcess->start(program, arguments); } c++ qt share|improve this question edited Mar 18 '14 at 22:34 asked Mar 18 '14 at 17:36 Spratters53 18513 1 In general you should also post a copy/paste of the error message; little things like error numbers or line number can be helpful. Anyway, the problem is that QLineEdit::text() needs an instance of a QLineEdit object to be called against. P
member function without object If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can http://www.qtcentre.org/threads/22283-Qt-Creator-error-cannot-call-member-function-without-object post: click the register link above to proceed. To start viewing messages, select http://www.qtforum.org/article/20190/call-member-function.html the forum that you want to visit from the selection below. Welcome to Qt Centre. Qt Centre is a community site devoted to programming in C++ using the Qt framework. Over 90 percent of questions asked here gets answered. If you are looking for information about Qt related issue — register and post member function your question. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today! cannot call member If you have any problems with the registration process or your account login, please contact us. + Reply to Thread Results 1 to 3 of 3 Thread: [Qt Creator] error: cannot call member function without object Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 7th July 2009,16:54 #1 jiveaxe View Profile View Forum Posts View Blog Entries View Articles Intermediate user Join Date Aug 2007 Posts 244 Thanks 42 Thanked 8 Times in 8 Posts Qt products Platforms [Qt Creator] error: cannot call member function without object Hi, I'm trying Qt Creator for developing my application but build fail with the following error: error: cannot call member function ‘bool QDir::exists(const QString&) const’ without object The error points to the if() of the following function: Qt Code: Switch view void AddressbookDialog::on_addPushButton_clicked(){ QFile file; QString fileName = QDir::homePath() + QDir::separator() + ".kesemes.xml"; if(!QDir::exists(fileName)) { //... } //...} void AddressbookDialog::on_addPushButton_clicked() { QFile file; QString fileName = QDir::homePath() + QDir::separator() + ".kesemes.xml"; if(!QDir::exists(fileName)) { //... } //... } To copy to clipboard, switch view to plain text mode This is the constructor: Qt Code: Sw
QtForum.org » Qt » Qt Programming » call member function Dear visitor, welcome to QtForum.org. If this is your first visit here, please read the Help. It explains in detail how this page works. To use all features of this page, you should consider registering. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here. Skip user information pieterprovoost Beginner Posts: 35 Location: Brugge, BE 1 Monday, April 9th 2007, 3:55pm call member function Hi, I'm trying to figure out how I can call a member function from outside. I keep getting these errors: Source code 1 2 3 4 5 6 7 remote.cpp: In function `EdsError handleobjectevent(EdsObjectEvent, __EdsObject* , EdsVoid*)': remote.cpp:69: error: cannot call member function `void remote::renamefile()' wi thout object mingw32-make[1]: *** [release\remote.o] Error 1 mingw32-make[1]: Leaving directory `D:/work/westbanks/remote' mingw32-make: *** [release] Error 2 Thanks! Go to the top of the page Skip user information bolt18_80 Intermediate Posts: 186 Location: Ohio, US Occupation: Programmer/Analyst 2 Monday, April 9th 2007, 5:15pm RE: call member function Without a code sample we can only guess...but my "guess" is that you are trying to call a non-static member function (remote::renamefile) without having an instance of the object. You should be using the method something like this... Source code 1 2 remote r; // create a "remote" object r.renamefile(); // call the method after you have an object of type remote hope this helps! Chris Christopher Springer Programmer/Analyst NBEC/NWOCA - Ohio SSDT Website: http://www.moderncpp.org cspringer@moderncpp.org Go to the top of the page Skip user information pieterprovoost Beginner Posts: 35 Location: Brugge, BE 3 Monday, April 9th 2007, 5:41pm Thanks Chris, that seems to be the problem. However, making a new instance won't solve my problem. Let me explain... I have an application which has several line edits. I now want to access the value of a line edit from "outside" (I'm quite new to Qt and C++ so I'm not sure what the right terminology is here). That's why I wanted to make