How to store/get pointer on QTreeWidgetItem data?

[Teerayoot]

I need to store/get pointer to raw data

here my test code

#include <QtCore>
#include <QtGui>
#include "qttest.h"
#include <string.h>
#include <stdio.h>
 
 
qttest::qttest(QWidget *parent, Qt::WFlags flags)
	: QDialog(parent, flags)
{
	ui.setupUi(this);
	ui.treeWidget->setHeaderLabels(QStringList() << "#" << "Name" << "Count" );
	QTreeWidgetItem *item =0;
	for(int i=0;i<50;i++){
		item = new QTreeWidgetItem(ui.treeWidget);
		item->setText(0,QString::number(i));
		item->setText(1,tr("Item %1").arg(i) );
		//item->setToolTip(1,"<b>hello's <br>QT</b>");
		unsigned char *data = new unsigned char [1024];
		strcpy((char*)data,"Hello world");
		item->setData(0,Qt::UserRole,data);
 
		QString count = QString::number(rand()%100);
		item->setText(2,count );
		ui.treeWidget->addTopLevelItem(item);
	}
 
 
 
}
 
qttest::~qttest()
{
 
 
}
 
 
void qttest::on_listWidget_currentRowChanged(int)
{
 
}
 
void qttest::on_treeWidget_doubleClicked(QModelIndex)
{
		//QString text = ui.treeWidget->currentItem()->text(1);
		char  *num =(char*)  ui.treeWidget->currentItem()->data(0,Qt::UserRole).value< char* >();
 
 
 
		ui.listWidget->addItem(num);
}

#include <QtCore>
#include <QtGui>
#include "qttest.h"
#include <string.h>
#include <stdio.h>


qttest::qttest(QWidget *parent, Qt::WFlags flags)
	: QDialog(parent, flags)
{
	ui.setupUi(this);
	ui.treeWidget->setHeaderLabels(QStringList() << "#" << "Name" << "Count" );
	QTreeWidgetItem *item =0;
	for(int i=0;i<50;i++){
		item = new QTreeWidgetItem(ui.treeWidget);
		item->setText(0,QString::number(i));
		item->setText(1,tr("Item %1").arg(i) );
		//item->setToolTip(1,"<b>hello's <br>QT</b>");
		unsigned char *data = new unsigned char [1024];
		strcpy((char*)data,"Hello world");
		item->setData(0,Qt::UserRole,data);
		
		QString count = QString::number(rand()%100);
		item->setText(2,count );
		ui.treeWidget->addTopLevelItem(item);
	}
	
	
	
}

qttest::~qttest()
{
	

}


void qttest::on_listWidget_currentRowChanged(int)
{

}

void qttest::on_treeWidget_doubleClicked(QModelIndex)
{
		//QString text = ui.treeWidget->currentItem()->text(1);
		char  *num =(char*)  ui.treeWidget->currentItem()->data(0,Qt::UserRole).value< char* >();
		


		ui.listWidget->addItem(num);
}

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Code can't compile ,here error

Error	1	error C2039: 'qt_metatype_id' : is not a member of 'QMetaTypeId<T>'	e:\qt\4.2.2\src\corelib\kernel\qmetatype.h	166

Error	1	error C2039: 'qt_metatype_id' : is not a member of 'QMetaTypeId<T>'	e:\qt\4.2.2\src\corelib\kernel\qmetatype.h	166

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Thank you in advance.

[marcel]

Here are your solutions:
- Use void pointers ( really not recommended )
- Register your custom types with qRegisterMetaType.

Why don't you use QString instead of const char*? Or is this data a larger buffer stored as char*?

Regards

[wysota]

Don't use QString is your data is not text. Use QByteArray instead.