配置文件（.ini)格式：
number=2
[config]
node1=sucess;iii
size=20
[source]
name=PC
其中每行必须顶格写，；后的为注释部分，可用［］来定义上一层的项目。
代码示例如下：
QSettings settings("/srv/c.ini",QSettings::IniFormat);
ui->label->setText(settings.value("config/node1").toString());
ui->lineEdit->setText(settings.value("config/size").toString());
int a=settings.value("number").toInt();
qDebug("the value a is: %d",a);
（二）深入一些
QT4.0一个非常有用的类QSettings
QSettings是qt4.0提供的一个读取配置文件的类，在windows平台，它提供了ini文件读些，注册表读写的功能。而且使用也非常简单。
QSettings::Format有两种:
QSettings::NativeFormat在windows平台可以读写windows注册表.
QSettings::IniFormat可以读写ini格式的配置文件
在Unix/X11平台下这两个Format效果是一样的。
1.读写注册表
- //注意的就是路径名必须是"/"而不是"\\"等.否则不能读写,同时注意
- //Format为QSettings::NativeFormat
- QSettings *settings = new QSettings("HKEY_CURRENT_USER/", QSettings::NativeFormat);
- //写HKEY_CURRENT_USER/regedit/test,设置test值为red
- settings->setValue("regedit/test", "red");
- //读 HKEY_CURRENT_USER/regedit/test,默认值是ddd
- QString value = settings->value("regedit/test", "ddd").toString();
- 删除设置对应的是settings->remove( const QString & key )
2.读取ini配置文件
ini文件格式如下:
- [Alpha]
- Beta/Beta=1, 3, 4
- Beta/Gamma=2
- Beta/Delta=1111
- Beta/Epsilon=5
- Iota=7
- Omicron=11
- QSettings *settings = new QSettings(fileName, QSettings::IniFormat);
- //写Beta/Beta
- settings->setValue("Alpha/Beta/Beta", 68);
其他和读写注册表差不多,我就懒得写了，发觉QT4读写的这种配置,即可兼容windows下的ini文件,同时它的功能也比windows API所提供的功能强.
（三）综合理解
QSettings *ConfigIni = new QSettings(QSettings::Ini);
ConfigIni->insertSearchPath(QSettings::Unix, "/home/Dawei");.//配置文件目录
ConfigIni->writeEntry(QString::fromUtf8("/config./opt/参数1"), QString::fromUtf8("中文"));
String aaa = ConfigIni->readEntry(QString::fromUtf8("/config./opt/参数1");
delete ConfigIni;
会在/home/Dawei目录下生成config.rc配置文件内容为
[opt]
参数1=中文
---------------------------------------
QSettings settings("../etc/bpms.conf", QSettings::IniFormat, &app);
QString db_hostname = settings.value("hostname").toString();
QString db_database = settings.value("database").toString();
QString db_username = settings.value("username").toString();
QString db_password = settings.value("password").toString();
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
db.setHostName(db_hostname);
db.setDatabaseName(db_database);
db.setUserName(db_username);
db.setPassword(db_password);
---------------------------------------------------------------
需要#include <QSettings>
只举几个简单的例子：
1、用QSettings写注册表
- QSettings *reg = new QSettings("HKEY_CURRENT_USER\\Software\\yinhaifan",
- QSettings::NativeFormat);
- reg->setValue("registered",true);
- delete reg;
QSettings *reg = new QSettings("HKEY_CURRENT_USER\\Software\\yinhaifan", QSettings::NativeFormat); reg->setValue("registered",true); delete reg;
当然reg->setValue还可以写入字符串，整型之类的数据。
比如reg->setValue("registered","yes");
2、用QString读注册表
- QSettings *reg = new QSettings("HKEY_CURRENT_USER\\Software\\yinhaifan",
- QSettings::NativeFormat);
- if (reg->value("registered",false).toBool())
- {
- QMessageBox::information(NULL,"information","registered");
- }
- delete reg;
QSettings *reg = new QSettings("HKEY_CURRENT_USER\\Software\\yinhaifan", QSettings::NativeFormat); if (reg->value("registered",false).toBool()) { QMessageBox::information(NULL,"information","registered"); } delete reg;
还可以toInt(),toString()等。
3、用QSettings写ini文件:
- QSettings *ConfigIni = new QSettings("D:\\a.ini",QSettings::IniFormat,0);
- ConfigIni->setValue("/config/node1",ui->lineEdit->text());
- delete ConfigIni;
QSettings *ConfigIni = new QSettings("D:\\a.ini",QSettings::IniFormat,0); ConfigIni->setValue("/config/node1",ui->lineEdit->text()); delete ConfigIni;
4、用QSettings读ini文件:
- QSettings *ConfigIni = new QSettings("D:\\a.ini",QSettings::IniFormat,0);
- ui->lineEdit_2->setText(ConfigIni->value("/config/node1","20").toString());
- delete ConfigIni;
QSettings *ConfigIni = new QSettings("D:\\a.ini",QSettings::IniFormat,0); ui->lineEdit_2->setText(ConfigIni->value("/config/node1","20").toString()); delete ConfigIni;
这几段代码都是在Qt Creator里面写的，所以用ui->lineEdit*->text()和ui->lineEdit*->setText()做输入和输出了。
在文档中的QSettings Class Reference部分讲的很清楚
---------------------------------------------------------------------
m_nDevNo = nDevNo;
QString strTemp;
QString xmlPath = CSC_APP.m_strWorkPath + "/InitInfo.ini";
QSettings *mySetting = new QSettings(xmlPath,QSettings::IniFormat);
foreach (QString group, mySetting->childGroups())
{
mySetting->beginGroup(group);
foreach (QString key, mySetting->childKeys())
{
QTextCodec *codec=QTextCodec::codecForName("GBK");
QString outStr = codec->toUnicode(key.toLatin1());
if (outStr == "自描述语言")
{
if ( mySetting->value(key,"0").toInt() == 1)
ui.SelfDspLgu->setCurrentIndex(1);
else
ui.SelfDspLgu->setCurrentIndex(0);
}
if (outStr == "工作语言")
{
if ( mySetting->value(key,"0").toInt() == 1)
ui.WorkLgu->setCurrentIndex(1);
else
ui.WorkLgu->setCurrentIndex(0);
}
if (outStr == "离线工作")
{
if ( mySetting->value(key,"0").toInt() == 1)
ui.WorkMode->setCurrentIndex(1);
else
ui.WorkMode->setCurrentIndex(0);
}
if (outStr == "召唤自描述方式")
{
if ( mySetting->value(key,"0").toInt() == 1)
ui.SelfDspSource->setCurrentIndex(1);
else
ui.SelfDspSource->setCurrentIndex(0);
}
if (outStr == "组播地址")
{
strTemp = mySetting->value(key,"236.8.8.8").toString();
ui.GrpAddress->setText(strTemp);
}
if (outStr == "接收端口号")
{
strTemp = mySetting->value("接收端口号","2000").toString();
ui.RecPort->setText(strTemp);
}
if (outStr == "发送端口号")
{
strTemp = mySetting->value("发送端口号","2001").toString();
ui.TargetPort->setText(strTemp);
}
if (outStr == "启用本机地址")
{
strTemp = mySetting->value(key,"0").toString();
}
if (outStr == "本机地址")
{
strTemp = mySetting->value(key,"0").toString();
ui.LocalIp->setText(strTemp);
}
if (outStr == "装置名称")
{
strTemp = mySetting->value(key,"0").toString();
ui.EqpName->setText(strTemp);
}
if (outStr == "装置地址")
{
strTemp = mySetting->value(key,"0").toString();
ui.EqpAddress->setText(strTemp);
}
if (outStr == "装置IP")
{
strTemp = mySetting->value(key,"0").toString();
ui.TargetIp->setText(strTemp);
}
}
mySetting->endGroup();