CString用法總結

1 CString中 儲存著 路徑+檔案名稱 如： c:\目錄\file.txt

 

獲得目錄和檔案名稱的方法：

 

CString path=_T("c:\\目錄\\file.txt");CString directory;CString fileName;int i=path.ReverseFind(_T('\\'));directory=path.Left(i+1);        //  directory 此時為目錄 c:\目錄\fileName=path.Right(path.GetLength()-i-1);  // fileName  為檔案名稱  file.txt

 

 在現有目錄下 新增一個子目錄

 

                 現有目錄 c:\目錄\

                 想產生的目錄  c:\目錄\目錄\

 

程式如下：

注意添加標頭檔   #include "Shlwapi.h"

 

CString path=_T("c:\\目錄\\file.txt");CString directory;CString fileName;int i=path.ReverseFind(_T('\\'));directory=path.Left(i+1);        //  directory 此時為目錄 c:\目錄\fileName=path.Right(path.GetLength()-i-1);  // fileName  為檔案名稱  file.txtdirectory+=_T("目錄\\");if (!PathIsDirectory(directory)){if (!CreateDirectory(directory,NULL)){CString errorInfo;errorInfo.Format(L"無法建立目錄 %s ",directory);AfxMessageBox(errorInfo);return ;}}    // directory 此時為c:\目錄\目錄\

 

2  建立檔案夾路徑

 

    CString 儲存著一檔案名稱  c:\d\1.txt  或 一檔案夾名： c:\d

    由這些資訊 建立路徑  c:\d

 

CreatePathFolder(CString path){int nFind = -1, nStart = 0;CString str;nFind = path.Find(L'\\',nStart);while (nFind>=0){str = path.Left(nFind);if(!PathFileExists(str))CreateDirectory(str,NULL);nStart = nFind + 1;nFind = path.Find(L'\\',nStart);}}

 

 

3 Mid  獲得字串

 

Extracts a substring of length nCount characters from thisCStringT object, starting at positioniFirst (zero-based).

CStringT Mid( int iFirst, int nCount) const;CStringT Mid( int iFirst) const;

Parameters

iFirst

The zero-based index of the first character in this CStringT object that is to be included in the extracted substring.

nCount

The number of characters to extract from this CStringT object. If this parameter is not supplied, then the remainder of the string is extracted.

return

A CStringT object that contains a copy of the specified range of characters. Note that the returnedCStringT object may be empty.

remark

The function returns a copy of the extracted substring. Mid is similar to the Basic Mid function (except that indexes in Basic are one-based).

For multibyte character sets (MBCS), nCount refers to each 8-bit character; that is, a lead and trail byte in one multibyte character are counted as two characters.

MSDN樣本：

 

CAtlString s( _T("abcdef") );_ASSERT( s.Mid( 2, 3 ) == _T("cde") );

 

自己的例子：

VECTOR容器中儲存著刪除線， mixString為源字串， trueString為刪除了刪除線以後的字串

 

trueString=_T("");CString mixString;GetRichEditCtrl().GetWindowText(mixString);int nStart=0;for (iter1=erasePosition.begin();iter1!=erasePosition.end();iter1++){trueString+=mixString.Mid(nStart,iter1->nStart-nStart);nStart=iter1->nEnd;}trueString+=mixString.Mid(nStart);

 

 4  CString 轉換成 LPTSTR （char *  or wchar *）

 

(LPTSTR)(LPCTSTR)

如：

CString leftMargin,rightMargin,topMargin,bottomMargin,middleMargin;CString pathSet;pathSet=m_exePath+L"UnionPicSet.ini";if (PathFileExists(pathSet)){GetPrivateProfileString(_T("Margin"),_T("LeftMargin"),NULL,(LPTSTR)(LPCTSTR)leftMargin,MAX_PATH,pathSet);        m_LeftMargin=_ttoi(leftMargin);GetPrivateProfileString(_T("Margin"),_T("RightMargin"),NULL,(LPTSTR)(LPCTSTR)rightMargin,MAX_PATH,pathSet);m_RightMargin=_ttoi(rightMargin);GetPrivateProfileString(_T("Margin"),_T("TopMargin"),NULL,(LPTSTR)(LPCTSTR)topMargin,MAX_PATH,pathSet);m_TopMargin=_ttoi(topMargin);GetPrivateProfileString(_T("Margin"),_T("BottomMargin"),NULL,(LPTSTR)(LPCTSTR)bottomMargin,MAX_PATH,pathSet);m_BottomMargin=_ttoi(bottomMargin);GetPrivateProfileString(_T("Margin"),_T("MiddleMargin"),NULL,(LPTSTR)(LPCTSTR)middleMargin,MAX_PATH,pathSet);m_MiddleMargin=_ttoi(middleMargin);GetPrivateProfileString(_T("Prefix"),_T("PagePrefix"),NULL,(LPTSTR)(LPCTSTR)m_PagePrefix,MAX_PATH,pathSet);}

 註： CString 經 (LPTSTR)(LPCTSTR) 轉換成指標類型後，CSting 對象內部結構遭到破壞 ，此時，調用  CString::GetLength() 會顯示0， 調用CString::IsEmpty()也會顯示空， 但實際上，其內部還儲存著資料，可對資料進行運算。

 

// 不能使用下面方式賦值    /*if (!rightMargin.IsEmpty())  // 始終顯示為空白，即使rightMargin儲存有資料 也顯示為空白{m_RightMargin=_ttoi(rightMargin);}*/

 

  5 求取CString中字的個數

CString str=L"你好";int num=0;wchar_t ch;for (int i=0;i<str.GetLength();i++){ch=str.GetAt(i);if (ch>=0XD800&&ch<=0XDBFF){i++; //  BMP之外的字}num++;}

6 判斷CString中是否有UNICODE>0X30000的字

//自訂的異體字UNICODE編碼 >0x30000//判斷字串中是否包含異體字BOOL bExsitYitizi(CString str)   {int num=0;  WORD w1,w2;  DWORD w;for (int i=0;i<str.GetLength();i++)  {  w1=str.GetAt(i);  if (w1>=0XD800&&w1<=0XDBFF)  {  i++; //  BMP之外的字  佔4個位元組w2=str.GetAt(i);DeCode(w,w1,w2);if (w>0x30000){return TRUE;}}  num++;  }  return FALSE;}

7 CString中 預留位置個數 ---漢字2個 字母等1個

//求取預留位置個數int NumOfPosition(CString str){int nCount=0;int unicode=0;for (int i = 0 ; i <str.GetLength();i++)    {unicode = (int)str.GetAt(i); if (unicode > 255)    {    nCount +=2 ;    //漢字}elsenCount++;       //字母數字等}return nCount;}

在中間位置書寫

glPushMatrix();//姓名numPosition=NumOfPosition (m_NameStr);glColor3f(1.0,1.0,0.0);glTranslatef(-numPosition/2.0*0.2,-0.1,-0.2);glScalef(0.4,0.4,0.4);Print3D(m_NameStr,hFont,0.2);glPopMatrix();