【Qt开发】QTableWidget设置根据内容调整列宽和行高
QTableWidget要調(diào)整表格行寬主要涉及以下一個函數(shù)
1.resizeColumnsToContents();??????? ? ??????????? 根據(jù)內(nèi)容調(diào)整列寬???????????
2.resizeColumnToContents(int col);?????????????? 根據(jù)內(nèi)容自動調(diào)整給定列寬
3.horizontalHeader()->setResizeMode?????????? 把給定列設(shè)置為給定模式
主要模式有Stretch和Fixed
posted @ 2011-11-29 22:21 ccsdu2009 閱讀(486) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-38.使用QSetting
QSetting類是QT中專門用于讀寫程序數(shù)據(jù)的對象
一個簡單的使用例子如下:
QSettings?setting("config.ini",QSettings::IniFormat);
????setting.beginGroup("config");
???????setting.setValue("page",QVariant(3));
???????setting.setValue("site",QVariant(";));
???????setting.setValue("maker",QVariant("Gaimor"));
????setting.endGroup();
當(dāng)然也可以使用分組的方式寫入，具體如下:
setting.setValue("config/page",QVariant(3));
setting.setValue("config/site",QVariant(";));
setting.setValue("config/maker",QVariant("Gaimor"));
它的讀寫值得函數(shù)原型如下:
void?setValue(const?QString?&key,?const?QVariant?&value);
????QVariant?value(const?QString?&key,?const?QVariant?&defaultValue?=?QVariant())?const;
當(dāng)然QSetting還有其他使用方式，以后慢慢總結(jié)
posted @ 2011-11-29 21:56 ccsdu2009 閱讀(250) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-35:QTableWidget動態(tài)增加行的方法
QTableWidget動態(tài)增加行的方法
其實(shí)很簡單的:
首先rowCount()得到當(dāng)前中的行數(shù)，然后在調(diào)用insertRow(row);即可
如果要動態(tài)增加列，方法類似
posted @ 2011-11-27 11:49 ccsdu2009 閱讀(355) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-34.QT中Pro文件的寫法
QT中 .pro文件的寫法如下：
1.?注釋
從“#”開始，到這一行結(jié)束。
2.?指定源文件
SOURCES = *.cpp
對于多源文件，可用空格分開，如:SOURCES = 1.cpp 2.cpp3.cpp
或者每一個文件可以被列在一個分開的行里面，通過反斜線另起一行，就像這樣:
SOURCES = hello.cpp \
????????????????? main.cpp
還有一種是這樣
SOURCES+= hello.cpp
??? SOURCES +=main.cpp
這種方法中使用“+=”比“=”更安全，因為它只是向已有的列表中添加新的文件，而不是替換整個列表。
3.?指定頭文件
HEADERS = hello.h或者HEADERS += hello.h
列出源文件的任何一個方法對頭文件也都適用。
4.?配置信息
CONFIG用來告訴qmake關(guān)于應(yīng)用程序的配置信息。
CONFIG+= qt warn_on release
在這里使用“+=”，是因為我們添加我們的配置選項到任何一個已經(jīng)存在中。這樣做比使用“=”那樣替換已經(jīng)指定的所有選項是更安全的。
A$amp;>amp;$nbsp;qt部分告訴qmake這個應(yīng)用程序是使用Qt來連編的。這也就是說qmake在連接和為編譯添加所需的包含路徑的時候會考慮到Qt庫的。
B$amp;>amp;$nbsp;warn_on部分告訴qmake要把編譯器設(shè)置為輸出警告信息的。
C$amp;>amp;$nbsp;release部分告訴qmake應(yīng)用程序必須被連編為一個發(fā)布的應(yīng)用程序。在開發(fā)過程中，程序員也可以使用debug來替換release
5.?指定目標(biāo)文件名
TARGET = filename
如果不設(shè)置該項目，目標(biāo)名會被自動設(shè)置為跟項目文件一樣的名稱
6.?添加界面文件(ui)
INTERFACES = filename.ui
7.?平臺相關(guān)性處理
我們在這里需要做的是根據(jù)qmake所運(yùn)行的平臺來使用相應(yīng)的作用域來進(jìn)行處理。為Windows平臺添加的依賴平臺的文件的簡單的作用域看起來就像這樣：
win32 {
SOURCES += hello_win.cpp
}
所以如果qmake運(yùn)行在Windows上的時候，它就會把hello_win.cpp添加到源文件列表中。如果qmake運(yùn)行在其它平臺上的時候，它會很簡單地把這部分忽略。
8.?如果一個文件不存在，停止qmake
如果某一個文件不存在的 時候，你也許不想生成一個Makefile。我們可以通過使用exists()函數(shù)來檢查一個文件是否存在。我們可以通過使用error()函數(shù)把正在運(yùn) 行的qmake停下來。這和作用域的工作方式一樣。只要很簡單地用這個函數(shù)來替換作用域條件。對main.cpp文件的檢查就像這樣：
!exists( main.cpp ) {
??error( "No main.cpp file found")
}
“!”用來否定這個測試，比如，如果文件存在，exists( main.cpp)是真，如果文件不存在，!exists( main.cpp )是真。
9.?檢查多于一個的條件
假設(shè)你使用Windows并且當(dāng)你在命令 行運(yùn)行你的應(yīng)用程序的時候你想能夠看到qDebug()語句。除非你在連編你的程序的時候使用console設(shè)置，你不會看到輸出。我們可以很容易地把 console添加到CONFIG行中，這樣在Windows下，Makefile就會有這個設(shè)置。但是如果告訴你我們只是想在當(dāng)我們的應(yīng)用程序運(yùn)行在 Windows下并且當(dāng)debug已經(jīng)在CONFIG行中的時候，添加console。這需要兩個嵌套的作用域；只要生成一個作用域，然后在它里面再生成 另一個。把設(shè)置放在最里面的作用域里，就像這樣：
win32 {
??debug {
?????CONFIG += console
??}
}
嵌套的作用域可以使用冒號連接起來，像這樣：
win32:debug {
CONFIG += console
}
10.?摸板
模板變量告訴qmake為這個應(yīng)用程序生成哪種makefile。下面是可供使用的選擇：
A$amp;>amp;$nbsp;app -建立一個應(yīng)用程序的makefile。這是默認(rèn)值，所以如果模板沒有被指定，這個將被使用。
B$amp;>amp;$nbsp;lib - 建立一個庫的makefile。
C$amp;>amp;$nbsp;vcapp - 建立一個應(yīng)用程序的VisualStudio項目文件。
D$amp;>amp;$nbsp;vclib - 建立一個庫的VisualStudio項目文件。
E$amp;>amp;$nbsp;subdirs -這是一個特殊的模板，它可以創(chuàng)建一個能夠進(jìn)入特定目錄并且為一個項目文件生成makefile并且為它調(diào)用make的makefile。
11.?生成Makefile
當(dāng)你已經(jīng)創(chuàng)建好你的項目文件，生成Makefile就很容易了，你所要做的就是先到你所生成的項目文件那里然后輸入：
Makefile可以像這樣由“.pro”文件生成：
qmake -oMakefile hello.pro
對于VisualStudio的用戶，qmake也可以生成“.dsp”文件，例如：
??? qmake -tvcapp -o hello.dsp hello.pro
posted @ 2011-11-26 21:50 ccsdu2009 閱讀(152) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-33.QTableView增加QCheckBox的方法
使用Delegate具體如下:
class?QLineDelegate?:?public?QStyledItemDelegate
{
????Q_OBJECT
public:
????QLineDelegate(QTableView*?tableView);
protected:
????void?paint(QPainter*?painter,const?QStyleOptionViewItem&?option,const?QModelIndex&?index)?const;
????bool?editorEvent(QEvent?*event,
?????????????????????????????????????????QAbstractItemModel?*model,
?????????????????????????????????????????const?QStyleOptionViewItem?&option,
?????????????????????????????????????????const?QModelIndex?&index)?;
private:
????QPen?????????pen;
????QTableView*??view;
};
static?QRect?CheckBoxRect(const?QStyleOptionViewItem?&view_item_style_options)
{
????QStyleOptionButton?check_box_style_option;
????QRect?check_box_rect?=?QApplication::style()->subElementRect(
????????QStyle::SE_CheckBoxIndicator,
????????&check_box_style_option);
????QPoint?check_box_point(view_item_style_options.rect.x()?+
???????????????????????????view_item_style_options.rect.width()?/?2?-
???????????????????????????check_box_rect.width()?/?2,
???????????????????????????view_item_style_options.rect.y()?+
???????????????????????????view_item_style_options.rect.height()?/?2?-
???????????????????????????check_box_rect.height()?/?2);
????return?QRect(check_box_point,?check_box_rect.size());
}
QLineDelegate::QLineDelegate(QTableView*?tableView)
{
????int?gridHint?=?tableView->style()->styleHint(QStyle::SH_Table_GridLineColor,?new?QStyleOptionViewItemV4());
????QColor?gridColor?=?static_cast<QRgb>(gridHint);
????pen?=?QPen(gridColor,0,tableView->gridStyle());
????view?=?tableView;
}
void?QLineDelegate::paint(QPainter*?painter,?const?QStyleOptionViewItem&?option,const?QModelIndex&?index)const
{
????bool?checked?=?index.model()->data(index,?Qt::DisplayRole).toBool();
????if(index.column()?==?0)
????{
????????QStyleOptionButton?check_box_style_option;
????????check_box_style_option.state?|=?QStyle::State_Enabled;
????????if(checked)
????????{
????????????check_box_style_option.state?|=?QStyle::State_On;
????????}
????????else
????????{
????????????check_box_style_option.state?|=?QStyle::State_Off;
????????}
????????check_box_style_option.rect?=?CheckBoxRect(option);
????????QApplication::style()->drawControl(QStyle::CE_CheckBox,&check_box_style_option,painter);
????}
????QStyledItemDelegate::paint(painter,option,index);
????QStyleOptionViewItem?itemOption(option);
????if(itemOption.state?&?QStyle::State_HasFocus)
????????itemOption.state?=?itemOption.state?^?QStyle::State_HasFocus;
????QStyledItemDelegate::paint(painter,itemOption,index);
????QPen?oldPen?=?painter->pen();
????painter->setPen(pen);
????painter->drawLine(option.rect.topRight(),option.rect.bottomRight());
????painter->drawLine(itemOption.rect.bottomLeft(),itemOption.rect.bottomRight());
????painter->setPen(oldPen);
}
bool?QLineDelegate::editorEvent(QEvent?*event,
???????????????????????????????????QAbstractItemModel?*model,
???????????????????????????????????const?QStyleOptionViewItem?&option,
???????????????????????????????????const?QModelIndex?&index)?{
????if((event->type()?==?QEvent::MouseButtonRelease)?||
????????(event->type()?==?QEvent::MouseButtonDblClick))
????{
????????QMouseEvent?*mouse_event?=?static_cast<QMouseEvent*>(event);
????????if(mouse_event->button()?!=?Qt::LeftButton?||
???????????!CheckBoxRect(option).contains(mouse_event->pos()))
????????{
????????????return?false;
????????}
????????if(event->type()?==?QEvent::MouseButtonDblClick)
????????{
????????????return?true;
????????}
????}
????else?if(event->type()?==?QEvent::KeyPress)
????{
????????if(static_cast<QKeyEvent*>(event)->key()?!=?Qt::Key_Space?&&
???????????static_cast<QKeyEvent*>(event)->key()?!=?Qt::Key_Select)
????????{
????????????return?false;
????????}
????}
????else
????{
????????return?false;
????}
????bool?checked?=?index.model()->data(index,?Qt::DisplayRole).toBool();
????return?model->setData(index,?!checked,?Qt::EditRole);
}
posted @ 2011-11-26 12:33 ccsdu2009 閱讀(461) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-32.QTableWidget增加QCheckBox的方法
#include?<QtGui>
class?ItemDelegate?:?public?QItemDelegate
{
public:
????ItemDelegate(QObject?*parent?=?0)
????????:?QItemDelegate(parent)
????{
????}
????virtual?void?drawCheck(QPainter?*painter,?const?QStyleOptionViewItem?&option,
????????const?QRect?&,?Qt::CheckState?state)const
????{
????????const?int?textMargin?=?QApplication::style()->pixelMetric(QStyle::PM_FocusFrameHMargin)?+?1;
????????QRect?checkRect?=?QStyle::alignedRect(option.direction,?Qt::AlignCenter,
????????????check(option,?option.rect,?Qt::Checked).size(),
????????????QRect(option.rect.x()?+?textMargin,?option.rect.y(),
????????????option.rect.width()?-?(textMargin?*?2),?option.rect.height()));
????????QItemDelegate::drawCheck(painter,?option,?checkRect,?state);
????}
????virtual?bool?editorEvent(QEvent?*event,?QAbstractItemModel?*model,?const?QStyleOptionViewItem?&option,
????????const?QModelIndex?&index)
????{
????????Q_ASSERT(event);
????????Q_ASSERT(model);
????????Qt::ItemFlags?flags?=?model->flags(index);
????????if(!(flags?&?Qt::ItemIsUserCheckable)?||?!(flags?&?Qt::ItemIsEnabled))
????????????return?false;
????????QVariant?value?=?index.data(Qt::CheckStateRole);
????????if(!value.isValid())
????????????return?false;
????????if(event->type()?==?QEvent::MouseButtonRelease)
????????{
????????????const?int?textMargin?=?QApplication::style()->pixelMetric(QStyle::PM_FocusFrameHMargin)?+?1;
????????????QRect?checkRect?=?QStyle::alignedRect(option.direction,?Qt::AlignCenter,
????????????????check(option,?option.rect,?Qt::Checked).size(),
????????????????QRect(option.rect.x()?+?textMargin,?option.rect.y(),
????????????????option.rect.width()?-?(2?*?textMargin),?option.rect.height()));
????????????if?(!checkRect.contains(static_cast<QMouseEvent*>(event)->pos()))
????????????????return?false;
????????}
????????else?if(event->type()?==?QEvent::KeyPress)
????????{
????????????if(static_cast<QKeyEvent*>(event)->key()?!=?Qt::Key_Space
????????????????&&?static_cast<QKeyEvent*>(event)->key()?!=?Qt::Key_Select)
????????????????return?false;
????????}
????????else
????????{
????????????return?false;
????????}
????????Qt::CheckState?state?=?(static_cast<Qt::CheckState>(value.toInt())?==?Qt::Checked
???????????? ?Qt::Unchecked?:?Qt::Checked);
????????//!?
????????return?model->setData(index,?state,?Qt::CheckStateRole);
????}
????void?drawFocus(QPainter?*painter,?const?QStyleOptionViewItem?&option,?const?QRect?&rect)?const
????{
????????QItemDelegate::drawFocus(painter,?option,?option.rect);
????}
};
static?int?ROWS?=?3;
static?int?COLS?=?3;
class?Table?:?public?QTableWidget
{
public:
????Table(QWidget?*parent?=?0)
????????:?QTableWidget(ROWS,?COLS,?parent)
????{
????????setItemDelegate(new?ItemDelegate(this));
????????QTableWidgetItem?*item?=?0;
????????for(int?i=0;?i<rowCount();?++i)
????????{
????????????for(int?j=0;?j<columnCount();?++j)
????????????{
????????????????setItem(i,?j,?item?=?new?QTableWidgetItem);
????????????????QTableViewItem;
????????????????item->setFlags(Qt::ItemIsEnabled|Qt::ItemIsUserCheckable);
????????????????item->setCheckState((i+j)?%?2?==?0? ?Qt::Checked?:?Qt::Unchecked);
????????????}
????????}
????}
};
int?main(int?argc,?char?**argv)
{
????QApplication?a(argc,?argv);
????Table?w;
????w.show();
????return?a.exec();
}
posted @ 2011-11-26 11:25 ccsdu2009 閱讀(264) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-31.QTableView只顯示橫格，不顯示點(diǎn)擊虛框的方法
重新風(fēng)格項代理QStyledItemDelegat
class?QLineDelegate?:?public?QStyledItemDelegate
{
????Q_OBJECT
public:
????QLineDelegate(QTableView*?tableView);
protected:
????void?paint(QPainter*?painter,const?QStyleOptionViewItem&?option,const?QModelIndex&?index)?const;
private:
????QPen?????????pen;
????QTableView*??view;
};
#include?<QPainter>
#include?"QLineDelegate.h"
QLineDelegate::QLineDelegate(QTableView*?tableView)
{
????int?gridHint?=?tableView->style()->styleHint(QStyle::SH_Table_GridLineColor,?new?QStyleOptionViewItemV4());
????QColor?gridColor?=?static_cast<QRgb>(gridHint);
????pen?=?QPen(gridColor,?0,?tableView->gridStyle());
????view?=?tableView;
}
void?QLineDelegate::paint(QPainter*?painter,?const?QStyleOptionViewItem&?option,const?QModelIndex&?index)const
{
????QStyleOptionViewItem?itemOption(option);
????if(itemOption.state?&?QStyle::State_HasFocus)
????????itemOption.state?=?itemOption.state?^?QStyle::State_HasFocus;
????QStyledItemDelegate::paint(painter,itemOption,index);
????QPen?oldPen?=?painter->pen();
????painter->setPen(pen);
????//painter->drawLine(option.rect.topRight(),option.rect.bottomRight());
????painter->drawLine(itemOption.rect.bottomLeft(),itemOption.rect.bottomRight());
????painter->setPen(oldPen);
}
posted @ 2011-11-25 20:22 ccsdu2009 閱讀(228) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-30.QTableView只顯示橫格的方式
默認(rèn)QTableView是顯示網(wǎng)狀格子的，如果不顯示網(wǎng)格則可以調(diào)用setShowGrid(false);來實(shí)現(xiàn)。但是如果只想顯示橫線則有點(diǎn)復(fù)雜了。具體代碼如下:
#include <QApplication>
#include <QTableWidget>
#include <QPainter>
#include <QStyledItemDelegate>
#include <QHeaderView>
class QLineDelegate : public QStyledItemDelegate
{
public:
QLineDelegate(QTableView* tableView);
protected:
void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const;
private:
QPen pen;
QTableView* view;
};
QLineDelegate::QLineDelegate(QTableView* tableView)
{
int gridHint = tableView->style()->styleHint(QStyle::SH_Table_GridLineColor, new QStyleOptionViewItemV4());
QColor gridColor = static_cast<QRgb>(gridHint);
pen = QPen(gridColor, 0, tableView->gridStyle());
view = tableView;
}
void QLineDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,const QModelIndex& index)const
{
QStyledItemDelegate::paint(painter, option, index);
QPen oldPen = painter->pen();
painter->setPen(pen);
//painter->drawLine(option.rect.topRight(), option.rect.bottomRight());
painter->drawLine(option.rect.bottomLeft(), option.rect.bottomRight());
painter->setPen(oldPen);
}
class QLineTableWidget:public QTableWidget
{
public:
QLineTableWidget();
};
QLineTableWidget::QLineTableWidget()
{
setStyleSheet("QTableView::Item{selection-background-color:#101020}");
setStyleSheet("QTableView::Item{background-color:#F0F0F0}");
verticalHeader()->setVisible(false);
horizontalHeader()->setVisible(true);
setSelectionBehavior(QAbstractItemView::SelectRows);
setSelectionMode(QAbstractItemView::SingleSelection);
setEditTriggers(QTableView::NoEditTriggers);
setColumnCount(3);
setRowCount(4);
setShowGrid(false);
setItemDelegate(new QLineDelegate(this));
setCurrentCell(-1,-1);
}
int main(int argc,char **argv)
{
QApplication a(argc,argv);
QLineTableWidget widget;
widget.show();
return a.exec();
}
posted @ 2011-11-22 22:23 ccsdu2009 閱讀(1253) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-30.自寫的QT插件系統(tǒng)
#ifndef?QPLUGIN_SYSTEM_H
#define?QPLUGIN_SYSTEM_H
#include?<QObject>
#include?<QVector>
#include?<QPluginLoader>
#include?<QDir>
template<class?T>
class?QPluginSystem
{
public:
????void?setup();
????int??getAddonCnt(){return?addons.size();}
????T*???getAddonByIndex(int?index){return?addons.at(index);}????
private:
????QVector<QPluginLoader*$amp;>amp;$nbsp;loaders;
????QVector<T*$amp;>amp;$nbsp;????????????addons;
};
template<class?T>
void?QPluginSystem<T>::setup()
{
????QString?path?=?QDir::currentPath();
????path?+=?QDir::separator();
????path?+=?"addons";
????QDir?pluginsDir(path);
????foreach(QString?fileName,pluginsDir.entryList(QDir::Files))
????{???
????????bool?autodel?=?false;
????????QPluginLoader*?pluginLoader?=?new?QPluginLoader(pluginsDir.absoluteFilePath(fileName));
????????QObject?*plugin?=?pluginLoader->instance();
????????if(plugin)
????????{
????????????T?*interface?=?qobject_cast<T*>(plugin);
????????????if(interface)
????????????{
????????????????addons.push_back(interface);
????????????????loaders.push_back(pluginLoader);
????????????????autodel?=?true;
????????????}
????????}
????????if(autodel?==?false)
????????????delete?pluginLoader;
????}
}
#endif
其中T是插件對象，需要繼承QObject
另外雖然我沒試過，但是我感覺增加QPluginLoader鏈表是很有必要的
posted @ 2011-11-17 22:11 ccsdu2009 閱讀(121) | 評論 (0) |?編輯?收藏
QT學(xué)習(xí)筆記-29.使用QT HTTP下載網(wǎng)絡(luò)文件
QT附帶的例子比較好: class?HttpWindow?:?public?QDialog
{
????Q_OBJECT
public:
????HttpWindow(QWidget?*parent?=?0);
????void?startRequest(QUrl?url);
private?slots:
????void?downloadFile();
????void?cancelDownload();
????void?httpFinished();
????void?httpReadyRead();
????void?updateDataReadProgress(qint64?bytesRead,?qint64?totalBytes);
????void?enableDownloadButton();
????void?slotAuthenticationRequired(QNetworkReply*,QAuthenticator?*);
private:
????QLabel?*statusLabel;
????QLabel?*urlLabel;
????QLineEdit?*urlLineEdit;
????QProgressDialog?*progressDialog;
????QPushButton?*downloadButton;
????QPushButton?*quitButton;
????QDialogButtonBox?*buttonBox;
????QUrl?url;
????QNetworkAccessManager?qnam;
????QNetworkReply?*reply;
????QFile?*file;
????int?httpGetId;
????bool?httpRequestAborted;
};
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實(shí)現(xiàn)為:
void?HttpWindow::startRequest(QUrl?url)
{
????reply?=?qnam.get(QNetworkRequest(url));
????connect(reply,?SIGNAL(finished()),
????????????this,?SLOT(httpFinished()));
????connect(reply,?SIGNAL(readyRead()),
????????????this,?SLOT(httpReadyRead()));
????connect(reply,?SIGNAL(downloadProgress(qint64,qint64)),
????????????this,?SLOT(updateDataReadProgress(qint64,qint64)));
}
void?HttpWindow::downloadFile()
{
????url?=?urlLineEdit->text();
????QFileInfo?fileInfo(url.path());
????QString?fileName?=?fileInfo.fileName();
????fileName?=?"downloadfile.dat";
????if(fileName.isEmpty())
????????fileName?=?"index.html";
????if(QFile::exists(fileName))?{
????????if?(QMessageBox::question(this,?tr("HTTP"),?
??????????????????????????????????tr("There?already?exists?a?file?called?%1?in?"
?????????????????????????????????????"the?current?directory.?Overwrite ").arg(fileName),
??????????????????????????????????QMessageBox::Yes|QMessageBox::No,?QMessageBox::No)
????????????==?QMessageBox::No)
????????????return;
????????QFile::remove(fileName);
????}
????file?=?new?QFile(fileName);
????if?(!file->open(QIODevice::WriteOnly))?{
????????QMessageBox::information(this,?tr("HTTP"),
?????????????????????????????????tr("Unable?to?save?the?file?%1:?%2.")
?????????????????????????????????.arg(fileName).arg(file->errorString()));
????????delete?file;
????????file?=?0;
????????return;
????}
????progressDialog->setWindowTitle(tr("HTTP"));
????progressDialog->setLabelText(tr("Downloading?%1.").arg(fileName));
????downloadButton->setEnabled(false);
????//?schedule?the?request
????httpRequestAborted?=?false;
????startRequest(url);
}
獲取url鏈接，生成本地文件，...
void?HttpWindow::cancelDownload()
{
????statusLabel->setText(tr("Download?canceled."));
????httpRequestAborted?=?true;
????reply->abort();
????downloadButton->setEnabled(true);
}
void?HttpWindow::httpFinished()
{
????if?(httpRequestAborted)?{
????????if?(file)?{
????????????file->close();
????????????file->remove();
????????????delete?file;
????????????file?=?0;
????????}
????????reply->deleteLater();
????????progressDialog->hide();
????????return;
????}
????progressDialog->hide();
????file->flush();
????file->close();
????QVariant?redirectionTarget?=?reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
????if?(reply->error())?{
????????file->remove();
????????QMessageBox::information(this,?tr("HTTP"),
?????????????????????????????????tr("Download?failed:?%1.")
?????????????????????????????????.arg(reply->errorString()));
????????downloadButton->setEnabled(true);
????}?else?if?(!redirectionTarget.isNull())?{????????
????????QUrl?newUrl?=?url.resolved(redirectionTarget.toUrl());
????????if?(QMessageBox::question(this,?tr("HTTP"),
??????????????????????????????????tr("Redirect?to?%1? ").arg(newUrl.toString()),
??????????????????????????????????QMessageBox::Yes?|?QMessageBox::No)?==?QMessageBox::Yes)?{
????????????url?=?newUrl;
????????????reply->deleteLater();
????????????file->open(QIODevice::WriteOnly);
????????????file->resize(0);
????????????startRequest(url);
????????????return;
????????}
????}?else?{
????????QString?fileName?=?QFileInfo(QUrl(urlLineEdit->text()).path()).fileName();
????????statusLabel->setText(tr("Downloaded?%1?to?current?directory.").arg(fileName));
????????downloadButton->setEnabled(true);
????}
????reply->deleteLater();
????reply?=?0;
????delete?file;
????file?=?0;
}
void?HttpWindow::httpReadyRead()
{
????//?this?slot?gets?called?every?time?the?QNetworkReply?has?new?data.
????//?We?read?all?of?its?new?data?and?write?it?into?the?file.
????//?That?way?we?use?less?RAM?than?when?reading?it?at?the?finished()
????//?signal?of?the?QNetworkReply
????if?(file)
????????file->write(reply->readAll());
}
void?HttpWindow::updateDataReadProgress(qint64?bytesRead,?qint64?totalBytes)
{
????if?(httpRequestAborted)
????????return;
????progressDialog->setMaximum(totalBytes);
????progressDialog->setValue(bytesRead);
}
轉(zhuǎn)載于:https://www.cnblogs.com/huty/p/8518171.html
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