Can be compiled and run
Problem: When using QSettings , for the key value in the registry similar to \Device\Serial0 in the serial port information , its value cannot be read with the value() function .
Analysis: When QT reads the registry, it cannot read values with path separators " \ " and " / " , which should be a small bug of QT .
Solution:
.h file
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QMessageBox>
#include <qt_windows.h>
#include <QSettings>
#include <QtGui/QMainWindow>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
private:
Ui :: Widget * ui ;
QStringList m_listcomboName;
HKEY hKey ;
LPCWSTR subkey;
wchar_t keyname [ 256 ]; // key name array
char keyvalue [ 256 ]; // key value array
DWORD keysize,type,valuesize;
int indexnum;
public:
QString getcomm ( int index , QString keyorvalue ); // read the key name
};
#endif // WIDGET_H
.cpp file
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
query -> setupQuery ( this );
QString path = "HKEY_LOCAL_MACHINE\\HARDWARE\\DEVICEMAP\\SERIALCOMM\\";
QSettings *settings = new QSettings( path, QSettings::NativeFormat);
QStringList key = settings->allKeys();
int num = (int)key.size();
QString value;
for(int i=0; i<num; i++)
{
value = getcomm(i, "value");
m_listcomboName<<value;
}
}
Widget::~Widget()
{
delete ui;
}
QString Widget::getcomm(int index,QString keyorvalue)
//index为索引号,keyorvalue为选择返回值应该为key还是value
{
QString commresult;
if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,TEXT("HARDWARE\\DEVICEMAP\\SERIALCOMM"),0,KEY_READ,&hKey)!=0)
{
QString error="Cannot open regedit!";//无法打开注册表时返回error
return error;
}//if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,subkey,0,KEY_READ,&hKey)!=0)
QString keymessage;//键名
QString message;
QString valuemessage;//键值
indexnum = index;//要读取键值的索引号
keysize=sizeof(keyname);
valuesize=sizeof(keyvalue);
if(::RegEnumValue(hKey,indexnum,keyname,&keysize,0,&type,(BYTE*)keyvalue,&valuesize)==0)//列举键名和值
{
for(int i=0;i<keysize;i++)
{
message=keyname[i];
keymessage.append(message);
}// for(int i=0;i<=keysize;i++) 读取键名
for(int j=0;j<valuesize;j++)
{
if(keyvalue[j]!=0x00)
{
valuemessage.append(keyvalue[j]);
}
}//for(int j=0;j<valuesize;j++) 读取键值
if(keyorvalue=="key")
{
commresult=keymessage;
}
if(keyorvalue=="value")
{
commresult=valuemessage;
}
}
else
{
commresult="nokey";
} //if(::RegEnumValue(hKey,indexnum,keyname,&keysize,0,&type,(BYTE*)keyvalue,&valuesize)==0) 列举键名和值
return commresult;
::RegCloseKey(hKey);//关闭注册表
}
以下是参考链接