CString成员函数使用实例

CString成员函数使用实例

王佰营 徐丽红

wbymcs51.blog.bokee.net

CString类在字符串处理中非常方便,快捷;熟练掌握非常重要.

一． Cstring的构造：

CString ss1;

ss1 = "This is my book";

CString ss2("Good bye!");

CString ss3 = ss2;

CString ss4(ss1);

CString ss5(ss2+"--"+ss3);

CString ss6(’H’);

//ss6=’H’;

CString ss7(’Y’,6); //ss7="YYYYYY";

CString ss8 = "Very Good!"; //ss7="Very Good!";

//IDS_ABOUTBOX 101 关于 MCS51(&A)...

cstring s7((lpcstr)id_file_new)。将字符类型转换成数值类型的api函数：atoi、_atoi64或atol等，均值提供对char*的转换cstring转化为uint，所以对于cstring，可以先通过cstring::getbuffer函数返回对应的char*或者强制转换成lpcstr,string类型可以通过函数c_str()间接地完成对应数值类型的转换，下面着重讨论char*转换成数值类型的方法。功能更强cstring转化为uint，并带有“布尔机"而又便于作数据通信的mcs-51系列单片机以及功能更高的16位单片机，大有取代mcs－48系列之势。

LPCTSTR lpsz ="abcd";

Cstring ss10(lpsz);

//ss10="abcd";

二． 成员函数；

1. void AnsiToOem( );

ss1 = "This is my book";

ss1.AnsiToOem();// ss1 = "This is my book";(OEM);

2. int Collate(LPCTSTR lpsz)const;

A>. LPCTSTR lpsz="abcd";

ss1="abcd";

int i=ss1.Collate(lpsz); // i = 0;

B>. LPCTSTR lpsz="abcc";

ss1="abcd";

int i=ss1.Collate(lpsz); // i = 1;

C>. LPCTSTR lpsz="abcf";

ss1="abcd";

int i=ss1.Collate(lpsz); // i = -1;

D>. ss1="abcd";

int i=ss1.Collate("abcD"); // i = -1;

E>. ss1="abcd";

int i=ss1. Collate("ABCD");// i =-1;

3. int CollateNoCase(LPCTSTR lpsz)const;

A>. LPCTSTR lpsz="abcd";

ss1="abcd";

int i=ss1. CollateNoCase (lpsz);// i = 0;

B>. LPCTSTR lpsz="abcc";

ss1="abcd";

int i=ss1. CollateNoCase (lpsz);// i = 1;

C>. LPCTSTR lpsz="abcf";

ss1="abcd";

int i=ss1. CollateNoCase (lpsz); // i = -1;

D>. ss1="abcd";

int i=ss1. CollateNoCase ("abcD");// i = 0;

E>. ss1="abcd";

int i=ss1. CollateNoCase ("ABCD");// i =0;

4. int Compare(LPCTSTR lpsz)const;

A>. LPCTSTR lpsz="abcd";

ss1="abcd";

int i=ss1.Compare (lpsz);// i = 0;

B>. LPCTSTR lpsz="abcc";

ss1="abcd";

int i=ss1.Compare (lpsz);// i = 1;

C>. LPCTSTR lpsz="abcf";

ss1="abcd";

int i=ss1.Compare (lpsz);// i = -1;

D>. ss1="abcd";

int i=ss1.Compare ("abcD");// i = 1;

E>. ss1="abcd";

int i=ss1.Compare ("ABCD");// i = 1;

5. int CompareNoCase(LPCTSTR lpsz)const;

A>. LPCTSTR lpsz="abcd";

ss1="abcd";

int i=ss1. CompareNoCase (lpsz);// i = 0;

B>. LPCTSTR lpsz="abcc";

ss1="abcd";

int i=ss1. CompareNoCase (lpsz);// i = 1;

C>. LPCTSTR lpsz="abcf";

ss1="abcd";

int i=ss1. CompareNoCase (lpsz);// i = -1;

D>. ss1="abcd";

int i=ss1. CompareNoCase ("abcD");// i = 0;

E>. ss1="abcd";

int i=ss1. CompareNoCase ("ABCD");// i =0;

6. int Delete(int nIndex, int nCount = 1);

Cstring ss1;

ss1="0123456789";

ss1.Delete(3,2);//ss1 = "01256789";

ss1="0123456789";

ss1.Delete(3,10);//出错！

ss1="0123456789";

ss1.Delete(3,0);//ss1 = "0123456789";

ss1="0123456789";

ss1.Delete(15,3);//ss1 = "0123456789";

7．void Empty();

Cstringss1="0123456789";

ss1.Empty();//ss1 = "";

7. int Find(TCHAR ch) const;

int Find(LPCTSTR lpszSub) const;

int Find(TCHAR ch, int nStart) const;

int Find(LPCTSTR lpszSub, int nStart) const;

int nPos;

Cstring ss1 = "0123456789";

nPos = ss1.Find(’5’); // nPos = 5;

nPos = ss1.Find(’567’); // nPos = 7;

nPos = ss1.Find("567"); // nPos = 7;

nPos = ss1.Find(’5’,3); // nPos = 5;

nPos = ss1.Find(’5’,6); // nPos = -1;

nPos = ss1.Find("567",0); // nPos = 5;

nPos = ss1.Find("567",9); // nPos = -1;

8. int FindOneOf(LPCSTR lpszCharSet, int nStart);

Cstring ss1 = "0123456789";

nPos = ss1.FindOneOf("A6B"); // nPos = 6

nPos = ss1.FindOneOf("4A6B"); // nPos = 4

9. void Format(LPCTSTR lpszFormat,....);

void Format(UINT nFormatID,....);

Cstring ss1;

int i = 100;

ss2.Format("There are %d books on the desk!",i);

//ss2 = "There are 100 books on the desk!"

void writestring(lpctstr lpsz)。void cmyhtmlctrl::onnavigatecomplete2(lpctstr strurl)。void ccomboxdlg::setcombox(lpctstr lpappname,lpctstr lpkeyname,lpctstr lpitemkeyname,ccombobox * pccombobox ) 。

LPCTSTR pstr = "1234567890";

va_list args;

va_start(args,pstr);

ss2.FormatV(pstr, args); // ss2 = "1234567890"

11. void FormatMessage(LPCTSTR lpszFormat,...);

void FormatMessage(UINT nFormatID,....);

LPCTSTR pstr="7654321";

ss2.FormatMessage(pstr); //ss2 = "7654321";

12．void FreeExtra();

13. TCHAR GetAt(int nIndex) const;

CStringss1="0123456789";

char ch = ss1.GetAt(7);// ch = ’7’;

14. PTSTR GetBuffer(int nMinBufLength);

void ReleaseBuffer(int nNewLength = -1);

Cstring ss1,ss2;

ss1="0123456789";

LPSTR lp = ss1.GetBuffer(10);

ss2 = lp; //ss2 = "0123456789";

strcpy(lp,"HELO!"); //ss1 = "HELO!";

ss1.ReleaseBuffer(); //lp所指向的缓冲区无效；

14．LPSTR GetBufferSetLength(int nNewLength);

Cstring ss1 = "0123456789";

LPSTR lp = ss1. GetBufferSetLength(3);

ss1="0123456789";

lp=ss1.GetBufferSetLength(3);

ss2=lp; //ss2 = "012";

strcpy(lp,"ABCDE"); //ss1 = "ABCDE";

15. int GetLength() const;

Cstring ss1 = "0123456789";

int len = ss1. GetLength(); //len = 10;

16. BOOL IsEmpty() const;

Cstring ss1 = "0123456789";

BOOL bEmpty = ss1. IsEmpty(); //bEmpty = faulse;

ss1 ="";

bEmpty = ss1. IsEmpty(); //bEmpty = true;

17. Cstring Left(int nCount) cost;

Cstring ss1 = "0123456789";

Cstring ss2 = ss1. Left (4); //ss2 = "0123";

//ss1 = "0123456789";

18. Cstring Right(int nCount) cost;

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