LNK2019: unresolved external symbol *public: __thiscall MyDialog::MyDialog(class QWidget*)* (??0MyDialog@@QAE@PAVQWidget@@@Z) referenced in function *private: void __thiscall MainWindow::showDialog(void)* (?showDialog@MainWindow@@AAEXXZ)
Microsoft Windows [版本 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Josh>mklink
建立符號連結。
MKLINK [[/D] | [/H] | [/J]] Link Target
/D 建立目錄符號連結。預設是檔案符號連結。
/H 建立永久連結而不是符號連結。
/J 建立目錄連接。
Link 指定新符號連結名稱。
Target 指定新連結參照的路徑 (相對或絕對)。
C:\Users\Josh>
ln -s /usr/lib/jvm/java-7-oracle /usr/lib/jvm/default-java
sudo gedit /etc/default/tomcat7 Added JAVA_HOME variable JAVA_HOME=/usr/lib/jvm/java-7-oracle
05-Nov-2014 13:38:52.881 INFO [main] org.apache.catalina.core.AprLifecycleListener.init The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
05-Nov-2014 13:38:52.962 WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:colorado-webapp' did not find a matching property.
sudo apt-get install libtcnative-1
05-Nov-2014 14:02:03.109 SEVERE [main] org.apache.catalina.core.AprLifecycleListener.init An incompatible version 1.1.22 of the APR based Apache Tomcat Native library is installed, while Tomcat requires version 1.1.30
$ sudo add-apt-repository ppa:pharmgkb/trusty $ sudo apt-get update $ sudo apt-get upgrade libtcnative-1
Server info: <%= application.getServerInfo() %>
Servlet version: <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %>
JSP version: <%= JspFactory.getDefaultFactory().getEngineInfo().getSpecificationVersion() %>
Java version: <%= System.getProperty("java.version") %>
Source from: how to know which servlet and jsp version
android update project –p .
ant clean release ant clean debug
~/bin/eclipse-j2ee-luna-64$ ./eclipse-j2ee -vm /home/joca/bin/jdk-8u20-linux-x64/bin
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package com.josh.demo;
public class GetBooleanDemo {
public static void main(String[] args) {
System.out.println("getBoolean(\"TRUE\") = " + Boolean.getBoolean("TRUE"));
System.out.println("getBoolean(\"FALSE\") = " + Boolean.getBoolean("FALSE"));
System.out.println("getBoolean(\"True\") = " + Boolean.getBoolean("True"));
System.out.println("getBoolean(\"False\") = " + Boolean.getBoolean("False"));
}
}
HKEY_CLASSES_ROOT->Directory->shell->cmd
dpkg --get-selections | grep -v deinstal
-v, --invert-match select non-matching lines
I:\>mklink
The syntax of the command is incorrect.
Creates a symbolic link.
MKLINK [[/D] | [/H] | [/J]] Link Target
/D Creates a directory symbolic link. Default is a file
symbolic link.
/H Creates a hard link instead of a symbolic link.
/J Creates a Directory Junction.
Link specifies the new symbolic link name.
Target specifies the path (relative or absolute) that the new link
refers to.
mklink /D [target symbolic link name] [source target folder name] ex: I:\> mklink /D WindowsLink C:\WindowsAbove example will create Windows Symbolic link underneath I:\> named by "WindowsLink".
class CLASS_A;
class CLASS_B;
int main()
{
CLASS_A a;
CLASS_B b;
return 0;
}
class CLASS_A{
public:
CLASS_A(){}
};
class CLASS_B{
public:
CLASS_B(){}
};
class CLASS_A;
class CLASS_B;
int main()
{
CLASS_B b;
CLASS_A a(&b);
return 0;
}
class CLASS_B; // Forward reference declare
class CLASS_A{
public:
CLASS_A( CLASS_B *pB){}
};
