在Qt应用中调用本地支付（Local Billing）APIs
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Introduction
本文参考自Local Billing API开发团队的资料，介绍在Qt应用中使用Local billing的API及库的方法，API的接口定义参考本地支付平台API资源及使用, 开发环境是QtSDK。
安装库到SDK和设备
1.复制ApiDll.dso ApiDll{000a0000}.dso到Symbian SDK相应位置C:\QtSDK\Symbian\SDKs\<$SDK>\epoc32\release\armv5\lib
开发过程
第一步，用QtCreator创建一个新的QtGui工程，将需要用到的两个头文件复制到工程下，并添加到工程中，在工程文件中可以看到：
HEADERS += mainwindow.h \
MStateHandler.h \
PayApi.h
同时将需要用到dll库和PayClient 客户端一起打包到应用中：
my_deployment.pkg_postrules.main = "IF NOT package(0x2005B89B)"\
"; install ApiDll_Symbian^3_Production.sis only if not already installed"\
"@\"ApiDll_Symbian^3_Production.sis\", (0x2005B89B)" \
"endif" \
"IF NOT package(0x2005B89E )"\
"; install PayClient.sis only if not already installed"\
"@\"PayClient_Symbian^3_Production.sis\", (0x2005B89E)"\
"endif"
DEPLOYMENT += my_deployment
第二步，打开mainwindow. ui文件， 添加一个pushButton 按钮 ，并连接到槽函数：on_pushButton_clicked()上。
第三步，让mainwindow.h 继承MStateHandler，并添加成员变量CPayApi* iPayApi 和声明继承自MStateHandler的两个虚函数。mainwindow.h为：
#include <QMainWindow>
#include "PayApi.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow,public MStateHandler
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_clicked();
public:
void ClientEvent(const TDesC& aEventDescription);
void PayResult(PAY_RESULT& aResult);
private:
Ui::MainWindow *ui;
CPayApi* iPayApi;
};
第四步在MainWindow.cpp中实现以上方法，调用支付客户端：
#include "mainwindow.h"
#include "ui_mainwindow.h"
#ifdef Q_OS_SYMBIAN
#include <eikenv.h>
#include <eikappui.h>
#include <aknenv.h>
#include <aknappui.h>
#include <e32base.h>
#endif
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
iPayApi = CPayApi::NewL(*this,appUi);//创建
}
MainWindow::~MainWindow()
{
delete ui;
delete iPayApi; //销毁
}
void MainWindow::on_pushButton_clicked()
{
iPayApi->IssuePayL(KNullDesC8,KNullDesC8,KNullDesC8,KNullDesC8,KNullDesC8);
}
//实现MStateHandler的两个函数
void MainWindow::ClientEvent(const TDesC& aEventDescription)
{
}
void MainWindow::PayResult(PAY_RESULT& aResult)
{
}
最后在Project中设置编译运行的SDK，连接设备，编译运行。源码下载：Media:Testnpp.zip
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