Symbian中的靜態類

什麼是靜態類?

靜態類不用產生類執行個體即可用來訪問其功能函數，當我們不需要成員資料或根據對象變化的行為，就可以使用這樣的靜態類。

如何在Symbian中產生靜態類?

我們不需要描述類時加上static首碼，只要在所有的函數前面加上static首碼即可。你不需要描述和實現構造及解構函式，因為根本不需要對象實體

標頭檔

// MyStatic.h.
/** No Need to derive from CBase as this class will never be instantiated over heap**/
class MyStaticClass
{
public: //all function must be public else no one can able to access it.
static void OpenOtherApplication(const TDesC& aUrl);
static HBufC8* ReadFromFile(RFs& aFs, const TDesC& aRootPath, const TDesC& aFileName);
static TInt StartExe(const TDesC& aUID);
        private:
          /** Make Desctructor Pure Virtual so that the class cannot be instantiated or inherited**/
          virtual ~MyStaticClass()=0;
};

源檔案

//MyStatic.cpp implementation
void MyStaticClass::OpenOtherApplication(const TDesC& aAppName)
{
//do your work here.
}
 
HBufC8* MyStaticClass::ReadFromFile(RFs& aFs, const TDesC& aRootPath, const TDesC& aFileName)
{
//do your work here.
}
TBool MyStaticClass::StartExe(const TDesC& aUID)
{
//do your work here.
}

如何使用靜態類?

Include MyStatic.h in your class. then directly use as follows
 
TInt error = MyStaticClass::StartExe(0xea3e3e10); //no need to create instance here.