描述符方法总结

这里列举的是经常用到的描述符方法的 写在方法里自己实验看看效果:

TextBuf.h

#ifndef __TEXTBUF_H__#define __TEXTBUF_H__// Include Files#include <e32base.h>// Function PrototypesGLDEF_C TInt E32Main();#endif // __TEXTBUF_H__

 

TextBuf.cpp

#include "TextBuf.h"#include <e32base.h>#include <e32std.h>#include <e32cons.h>// Console#include <Description.h>// Constants_LIT(KTextConsoleTitle, "Console");_LIT(KTextFailed, " failed, leave code = %d");_LIT(KTextPressAnyKey, " [press any key]/n");// Global VariablesLOCAL_D CConsoleBase* console; // write all messages to thisLOCAL_C void MainL(){CDescription* desc=CDescription::NewL(*console);desc->WaitForKey();desc->DeletionExample();//改变这里????????}LOCAL_C void DoStartL(){// Create active scheduler (to run active objects)CActiveScheduler* scheduler = new (ELeave) CActiveScheduler();CleanupStack::PushL(scheduler);CActiveScheduler::Install(scheduler);MainL();// Delete active schedulerCleanupStack::PopAndDestroy(scheduler);}// Global FunctionsGLDEF_C TInt E32Main(){// Create cleanup stack__UHEAP_MARK;CTrapCleanup* cleanup = CTrapCleanup::New();// Create output consoleTRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen, KConsFullScreen)));if (createError)return createError;// Run application code inside TRAP harness, wait keypress when terminatedTRAPD(mainError, DoStartL());if (mainError)console->Printf(KTextFailed, mainError);console->Printf(KTextPressAnyKey);console->Getch();delete console;delete cleanup;__UHEAP_MARKEND;return KErrNone;}

 

 

Description.h

#ifndef DESCRIPTION_H#define DESCRIPTION_H// INCLUDES#include <e32std.h>#include <e32base.h>#include <e32cons.h>// CLASS DECLARATION/** * CDescription * */class CDescription : public CBase{public:// Constructors and destructor/** * Destructor. */~CDescription();/** * Two-phased constructor. */static CDescription* NewL(CConsoleBase& aconsole);/** * Two-phased constructor. */static CDescription* NewLC(CConsoleBase& aconsole);void callExampleL();void doExampleL();void useTBuf();void useTBufC();void useTPtr();void useTPtrC();void WaitForKey();void CompareExample();void FindExample();void MatchExample();void SubstringExample();void copyExample();void FillExample();void AppendExample();void FormatExample();//{}void caseExample();void DeletionExample();private:/** * Constructor for performing 1st stage construction */CDescription(CConsoleBase& aconsole);/** * EPOC default constructor for performing 2nd stage construction */void ConstructL();private:CConsoleBase& iConsole;};#endif // DESCRIPTION_H

 

 

 Description.cpp

#include "Description.h"CDescription::CDescription(CConsoleBase& aConsole):iConsole(aConsole){// No implementation required}CDescription::~CDescription(){}CDescription* CDescription::NewLC(CConsoleBase& aConsole){CDescription* self = new (ELeave)CDescription(aConsole);CleanupStack::PushL(self);self->ConstructL();return self;}CDescription* CDescription::NewL(CConsoleBase& aConsole){CDescription* self = CDescription::NewLC(aConsole);CleanupStack::Pop(); // self;return self;}void CDescription::ConstructL(){//iconsole=aconsole;}void CDescription::WaitForKey(){_LIT(KMessage,"Press any key to continue/n/n");iConsole.Printf(KMessage);iConsole.Getch();}void CDescription::useTBuf(){iConsole.Printf(_L("/n********useTBuf***********/n"));///n是换行_LIT(KMessage1,"There are cats ");_LIT(KMessage2,"and dogs");_LIT(KMessage3,"white ");_LIT(KMessage4,"black ");_LIT(KMessage5,"HBufC alloc length is %d");_LIT(KMessage6,"HBufC ReAlloc length is %d");_LIT(KMessage7,"The first address of buf is %x");_LIT(KEnter,"/n");TBuf<40> buf;buf=KMessage1;iConsole.Printf(buf);iConsole.Printf(KEnter); buf.Append(KMessage2);iConsole.Printf(buf);iConsole.Printf(KEnter); buf.Insert(10,KMessage3);buf.Insert(25,KMessage4);iConsole.Printf(buf);iConsole.Printf(KEnter); HBufC* hbufc=HBufC::New(40);//返回一个指向HBufC的指针hbufc=buf.Alloc();//申请一块栈内存 利用buf来初始化他 得到的地址赋值给hbufc指针TPtr ptr1=hbufc->Des();iConsole.Printf(ptr1);//==iConsole.Printf(*hbufc);iConsole.Printf(KEnter); iConsole.Printf(KMessage5,ptr1.MaxLength());iConsole.Printf(KEnter); WaitForKey();hbufc->ReAlloc(50);TPtr ptr2=hbufc->Des();iConsole.Printf(KMessage6,ptr2.MaxLength());//从定义了最大长度iConsole.Printf(KEnter); WaitForKey();iConsole.Printf(KMessage7,buf.Ptr());//得到buf的头地址iConsole.Printf(KEnter);WaitForKey();}void CDescription::useTBufC(){iConsole.Printf(_L("/n********useTBufC***********/n"));///n是换行_LIT(KMessage1,"There are flowers ");_LIT(KMessage2,"and tree");_LIT(KMessage3,"buautiful ");_LIT(KMessage4,"HBufC alloc length is %d");_LIT(KMessage5,"HBufC ReAlloc length is %d");_LIT(KMessage6,"The first address of bufc is %x");_LIT(KEnter,"/n");TBufC<40> bufc;bufc=KMessage1;iConsole.Printf(bufc);iConsole.Printf(KEnter); TPtr ptr=bufc.Des();//把不可改变的bufc变为可以改变的描述符赋予ptr 通过ptr来对bufc进行改变的操作ptr.Append(KMessage2);iConsole.Printf(bufc);iConsole.Printf(KEnter); ptr.Insert(10,KMessage3);iConsole.Printf(bufc);iConsole.Printf(KEnter); HBufC* hbufc=HBufC::New(40);hbufc=bufc.Alloc();TPtr ptr1=hbufc->Des();iConsole.Printf(ptr1);iConsole.Printf(KEnter); iConsole.Printf(KMessage4,ptr1.MaxLength()); iConsole.Printf(KEnter); WaitForKey();hbufc->ReAlloc(50);TPtr ptr2=hbufc->Des();iConsole.Printf(KMessage5,ptr2.MaxLength());iConsole.Printf(KEnter); WaitForKey();iConsole.Printf(KMessage6,bufc.Ptr());iConsole.Printf(KEnter); WaitForKey();}void CDescription::useTPtr(){iConsole.Printf(_L("/n******userTPtr*******/n"));_LIT(KMessage1,"There are pandas ");_LIT(KMessage2,"and deers");_LIT(KMessage3,"small lovely ");_LIT(KMessage4,"HBufC alloc length is %d");_LIT(KMessage5,"HBufC ReAlloc length is %d");_LIT(KMessage6,"The first address of ptr is %x");_LIT(KEnter,"/n");TBufC<40> bufc(KMessage1);TPtr16 ptr(bufc.Des());//TPtr16 ptr=bufc.Des();iConsole.Printf(ptr);iConsole.Printf(KEnter); WaitForKey();ptr.Append(KMessage2);iConsole.Printf(ptr);iConsole.Printf(KEnter); ptr.Insert(10,KMessage3);iConsole.Printf(ptr);iConsole.Printf(KEnter); HBufC* hbufc=HBufC::New(40);//hbufc=ptr.Alloc();//HBufC* hbufc=ptr.Alloc();TPtr ptr1=hbufc->Des();iConsole.Printf(ptr1);iConsole.Printf(KEnter); iConsole.Printf(KMessage4,ptr1.MaxLength());iConsole.Printf(KEnter); WaitForKey();hbufc->ReAlloc(50);TPtr ptr2=hbufc->Des();iConsole.Printf(KMessage5,ptr2.MaxLength());iConsole.Printf(KEnter); WaitForKey();iConsole.Printf(KMessage6,ptr.Ptr());iConsole.Printf(KEnter); WaitForKey();}void CDescription::useTPtrC(){iConsole.Printf(_L("/n******userTPtrC*******/n"));_LIT(KMessage1,"There are book ");_LIT(KMessage2,"HBufC alloc length is %d");_LIT(KMessage3,"HBufC ReAlloc length is %d");_LIT(KMessage4,"The first address of ptrc is %x");_LIT(KEnter,"/n");TPtrC ptrc(KMessage1);iConsole.Printf(ptrc);iConsole.Printf(KEnter); HBufC* hbufc=HBufC::New(40);hbufc=ptrc.Alloc();TPtr ptr1=hbufc->Des();iConsole.Printf(ptr1);iConsole.Printf(KEnter); iConsole.Printf(KMessage2,ptr1.MaxLength());iConsole.Printf(KEnter); hbufc->ReAlloc(50);TPtr ptr2=hbufc->Des();iConsole.Printf(KMessage3,ptr2.MaxLength());iConsole.Printf(KEnter); iConsole.Printf(KMessage4,ptrc.Ptr());iConsole.Printf(KEnter); }void CDescription::CompareExample(){iConsole.Printf(_L("/n******Test Compare*******/n"));_LIT(KString1,"My String");_LIT(KString2,"MY STRING");_LIT(KString3,"Another string");_LIT(KEnter,"/n");TBuf<20> str1(KString1);TBuf<20> str2(KString2);TInt res;/*比较描述符是否相同*/res=str1.Compare(KString1);_LIT(KFormatCompare1,"Compare() str1 and string1= %d/n");iConsole.Printf(KFormatCompare1,res);res=str1.Compare(str2);_LIT(KFormatCompare2,"Compare() str1 and str2= %d/n");iConsole.Printf(KFormatCompare2,res);res=str1.CompareF(str2);_LIT(KFormatCompare3,"CompareF() string1 and string2= %d/n");iConsole.Printf(KFormatCompare3,res);res=str1.CompareF(KString3);_LIT(KFormatCompare4,"CompareF() string1 and string3= %d/n");iConsole.Printf(KFormatCompare4,res);}void CDescription::FindExample(){iConsole.Printf(_L("/n******Test Find*******/n"));_LIT(KString1,"This is a test string");_LIT(KString2,"test");_LIT(KString3,"car");_LIT(KString4,"TEST");_LIT(KEnter,"/n");TBuf<40> buf(KString1);TInt res;/*在KString1中寻找“test” 并且返回其位置*/res=buf.Find(KString2);_LIT(KFormat1,"Find of string 2 in string1 res=%d/n");iConsole.Printf(KFormat1,res);/*在KString1中寻找“car” 以为没有所以返回KErrNotFound*/res=buf.Find(KString3);_LIT(KFormat2,"Find of string 3 in string1 res=%d/n");iConsole.Printf(KFormat2,res);/*由于是FindF是合并比较模式，所以可以发现“TEST” 并且返回他的位置*/res=buf.FindF(KString4);_LIT(KFormat3,"Find of string 4 in string1 res=%d/n");iConsole.Printf(KFormat3,res);}//Match中 "*" 代表人以字符序列 "?"代表任意单个字符void CDescription::MatchExample(){iConsole.Printf(_L("/n******Test Match*******/n"));_LIT(KString1,"This is test string A");_LIT(KString2,"This is test string ?");_LIT(KString3,"*is test string ?");_LIT(KString4,"*");_LIT(KString5,"*B");_LIT(KEnter,"/n");TBuf<40> buf(KString1);TInt res;res=buf.Match(KString2);_LIT(KFormat1,"Match:string 2 and string 1 res=%d/n");iConsole.Printf(KFormat1,res);//这个是可以配上的res=buf.Match(KString3);_LIT(KFormat2,"Match:string 3 and string 1 res=%d/n");iConsole.Printf(KFormat2,res);res=buf.Match(KString4);_LIT(KFormat3,"Match:string 4 and string 1 res=%d/n");iConsole.Printf(KFormat3,res);res=buf.Match(KString5);_LIT(KFormat4,"Match:string 5 and string 1 res=%d/n");iConsole.Printf(KFormat4,res);}void CDescription::SubstringExample(){_LIT(KString1,"This is my string");TBufC<40> buff(KString1);////定义字符串/*得到左边的4个字符*/TPtrC SubStr=buff.Left(4);//定义指针型描述符_LIT(KFormat1,"Left(4):SubStr=/"%S/"/n");iConsole.Printf(KFormat1,&SubStr);/*得到右边三个字符*/SubStr.Set(buff.Right(3));_LIT(KFormat2,"Right(3):SubStr=/"%S/n");iConsole.Printf(KFormat2,&SubStr);/*从第八个位置开始取六个字符*/SubStr.Set(buff.Mid(8,6));_LIT(KFormat3,"Mid(8,6):SubStr=/"%S/n");iConsole.Printf(KFormat3,&SubStr);}void CDescription::copyExample(){TUint8 binData[6]={0xB0,0xB1,0xB2,0xB3,0xB4,0xB5};//这里的0x是八位 所以才定义TBuf8/*拷贝标准C语言数组到二进制描述符中*/TBuf8<sizeof(binData)> binDes;binDes.Copy(binData,sizeof(binData));_LIT(KFormat1,"binDes(0)=%x binDes[1]=%x/n");iConsole.Printf(KFormat1,binDes[0],binDes[1]);/*拷贝二进制描述符到另外一个二进制描述符*/TBuf8<20> buf8;buf8.Copy(binDes);_LIT(KFormat2,"buf8[0]=%x buf[1]=%x/n");iConsole.Printf(KFormat2,buf8[0],buf8[1]);/*拷贝常量描述符到描述符*/ _LIT(KString1,"My string");TBuf<20> buf16;buf16.Copy(KString1);_LIT(KFormat3,"buf16=%S/n");iConsole.Printf(KFormat3,&buf16);//为什么这里要用&了 不明白/*拷贝8位字符串到描述符*/TUint8 *C_str =(TUint8 *)"Hello there";buf8.Copy(C_str);buf16.Copy(buf8);iConsole.Printf(KFormat3,&buf16);//为什么这里要用&了 不明白/*拷贝并且转为大写*/TBuf<20> newBuf;newBuf.CopyUC(buf16);_LIT(KFormat4,"CopyUC newBuf=%S/n");iConsole.Printf(KFormat4,&newBuf);//为什么这里要用&了 不明白/*拷贝并且转为小写*/newBuf.CopyLC(buf16);_LIT(KFormat5,"CopyLC newBuf=%S/n");iConsole.Printf(KFormat5,&newBuf);//为什么这里要用&了 不明白/*拷贝并且首字母大写*/newBuf.CopyCP(buf16);_LIT(KFormat6,"CopyCP newBuf=%S/n");iConsole.Printf(KFormat6,&newBuf);//为什么这里要用&了 不明白}void CDescription::FillExample(){TBuf<40> buf;buf.Fill('*',10);_LIT(KFormat1,"buf=/"%S/"/n");iConsole.Printf(KFormat1,&buf);buf.Fill('-');iConsole.Printf(KFormat1,&buf);}void CDescription::AppendExample(){_LIT(KMyString1,"String:");_LIT(KMyString2,"num vals are ");_LIT(KMyString3,"Justify");TInt num=0x0b4a;//TBuf<40> str(KMyString1);/*追加一个字面描述符*/str.Append(KMyString2);/*以下以各种形式追加数字*/str.AppendNum(num);str.Append(' ');str.AppendNum(num,EHex);str.Append(' ');str.AppendNumUC(num,EHex);//EHex=16str.Append(' ');str.AppendNumFixedWidthUC(num,EHex,5);//EHex=16_LIT(KFormat1,"str=%S/n");iConsole.Printf(KFormat1,&str);TBuf<40> just;/*对齐字符串Justify a string */just.AppendJustify(KMyString3,12,ERight,' ');/*在""之间添加任何字符串*/_LIT(KFormat2,"%S/n");iConsole.Printf(KFormat2,&just);/*添加重复的字符*/just.AppendFill('!',5);iConsole.Printf(KFormat2,&just);}void CDescription::FormatExample(){_LIT(KString1,"My string");TInt value=10,value1=20;_LIT(KMyDesFormat,"Descriptor=%S,value=%d");TBuf<100> buf;buf.Format(KMyDesFormat,&KString1,value);_LIT(KMyDesFormat1,"--also value1=%d");buf.AppendFormat(KMyDesFormat1,value1);_LIT(KFormat1,"%S/n");iConsole.Printf(KFormat1,&buf);}void CDescription::caseExample(){_LIT(KString,"hillary");TBuf<7> name(KString);name.UpperCase();_LIT(KFormat1,"name=%S/n");iConsole.Printf(KFormat1,&name);name.LowerCase();iConsole.Printf(KFormat1,&name);name.Capitalize();iConsole.Printf(KFormat1,&name);}void CDescription::DeletionExample(){_LIT(KString1,"Heeeello");_LIT(KString2," This is a test ");TBuf<20> buf1(KString1);TBuf<40> buf2(KString2);_LIT(KFormat1,"buf1=/"%S/" vuf1.length=%d/n");iConsole.Printf(KFormat1,&buf1,buf1.Length());/*删除字符串从 1 开始 长度为 3 */buf1.Delete(1,3);iConsole.Printf(KFormat1,&buf1,buf1.Length());_LIT(KFormat2,"buf2=/"%S/" buf2.length=%d/n");iConsole.Printf(KFormat2,&buf2,buf2.Length());/*删除开头的空格*/buf2.TrimLeft();_LIT(KFormat3,"TrimLeft():buf2=/"%S/" buf2.length=%d/n");iConsole.Printf(KFormat3,&buf2,buf2.Length());/*重置描述符*/buf2.Copy(KString2);/*删除开头的空格*/buf2.TrimRight();_LIT(KFormat4,"TrimRight():buf2=/"%S/" buf2.length=%d/n");iConsole.Printf(KFormat4,&buf2,buf2.Length());/*删除开头和尾部的空格*/buf2.Copy(KString2);buf2.Trim();_LIT(KFormat5,"Trim():buf2=/"%S/" buf2.length=%d/n");iConsole.Printf(KFormat5,&buf2,buf2.Length());/*删除所有空格*/buf2.Copy(KString2);buf2.TrimAll();_LIT(KFormat6,"TrimALL():buf2=/"%S/" buf2.length=%d/n");iConsole.Printf(KFormat6,&buf2,buf2.Length());}