MFC常用小工具函数

1、判断文件是否存在

bool IsFileExist(CString sFileName)
{CFile File;if (TRUE !&＃61; File.Open(sFileName, CFile::modeRead)){return false;}return true;
}


1、判断文件夹是否为空

int CountDirectory(CString path)
{int count &＃61; 0;CFileFind finder;BOOL working &＃61; finder.FindFile(path &＃43; _T("\\*.*"));while (working){working &＃61; finder.FindNextFile();if (finder.IsDots())continue;if (finder.IsDirectory())count &＃43;&＃61; CountDirectory(finder.GetFilePath());elsecount&＃43;&＃43;;}return count;
}


2、判断目录是否存在

bool CLib_Global::IsPathExist(const CString sPathName)
{WIN32_FIND_DATA wfd;bool rValue &＃61; false;HANDLE hFind &＃61; FindFirstFile(sPathName, &wfd);if ((hFind !&＃61; INVALID_HANDLE_VALUE) && (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)){rValue &＃61; true;}FindClose(hFind);return rValue;
}


3、从全文件路径中找到带后缀的文件名

CString CLib_Global::GetTitleFileName(const CString sFileName)
{CString sRt &＃61; sFileName;const TCHAR cSeparator &＃61; _T(&＃39;\\&＃39;);CString sTempName &＃61; sFileName;sTempName.Replace(_T(&＃39;/&＃39;), cSeparator); //有些路径是反斜杠&＃xff0c;必须校正简化int nFind &＃61; sTempName.ReverseFind(cSeparator);if (nFind >&＃61; 0 && nFind}


4、从全文件路径中找到路径名(不含)

CString CLib_Global::GetFilePath(const CString sFileName)
{CString sRt;const TCHAR cSeparator &＃61; _T(&＃39;\\&＃39;);CString sTempName &＃61; sFileName;sTempName.Replace(_T(&＃39;/&＃39;), cSeparator); //有些路径是反斜杠&＃xff0c;必须校正简化int nFind &＃61; sTempName.ReverseFind(cSeparator);if (nFind>&＃61;0 && nFind}


5、取文件后缀

CString CLib_Global::GetFileExtName(CString sFileName)
{CString sExt;const int nFindIndex &＃61; sFileName.ReverseFind(_T(&＃39;.&＃39;));if (nFindIndex > 0 &&sFileName.GetLength() - 1 !&＃61; nFindIndex){sExt &＃61; sFileName.Mid(nFindIndex &＃43; 1);}return sExt;
}


6、MFC判断文件夹路径是否存在以及创建文件夹的方法

PathIsDirectory() 检测路径是否存在
CreateDirectioy() 创建文件夹
两个函数需要使用shlwapi.h头文件以及添加shlwapi.lib或shlwapi.dll 库函数


7、平面坐标下计算外包类

// Summary: 平面坐标系下的外包立方体&＃xff0c;横平竖直
class CHCExtent
{
public:CHCExtent(){m_bIsEmpty &＃61; true;}void AddPoint(const AcGePoint3d& pt){if(m_bIsEmpty){m_min.x &＃61; m_max.x &＃61; pt.x;m_min.y &＃61; m_max.y &＃61; pt.y;m_min.z &＃61; m_max.z &＃61; pt.z;m_bIsEmpty &＃61; false;}else{m_min.x &＃61; min(m_min.x, pt.x);m_min.y &＃61; min(m_min.y, pt.y);m_min.z &＃61; min(m_min.z, pt.z);m_max.x &＃61; max(m_max.x, pt.x);m_max.y &＃61; max(m_max.y, pt.y);m_max.z &＃61; max(m_max.z, pt.z);}}void AddExtent(const CHCExtent& other){if(other.m_bIsEmpty)return;if(m_bIsEmpty)*this &＃61; other;else{m_min.x &＃61; min(m_min.x, other.m_min.x);m_min.y &＃61; min(m_min.y, other.m_min.y);m_min.z &＃61; min(m_min.z, other.m_min.z);m_max.x &＃61; max(m_max.x, other.m_max.x);m_max.y &＃61; max(m_max.y, other.m_max.y);m_max.z &＃61; max(m_max.z, other.m_max.z);}}public:bool m_bIsEmpty;AcGePoint3d m_min;AcGePoint3d m_max;
};


8、判断是否是数字

bool IsNumber(CString sNumber)
{if (sNumber.IsEmpty())return false;if (sNumber[0] &＃61;&＃61; &＃39;-&＃39;){sNumber &＃61; sNumber.Mid(1);if (sNumber.IsEmpty())return false;}int nDotCount &＃61; 0;for (int i &＃61; 0; i &＃39;9&＃39;))return false;}if (nDotCount > 1)return false;return true;
}


9、删除文件夹及其里面的所有内容

void myDeleteDirectory(CString directory_path) //删除一个文件夹下的所有内容
{ CFileFind finder;CString path;path.Format("%s/*.*",directory_path);BOOL bWorking &＃61; finder.FindFile(path);while(bWorking){bWorking &＃61; finder.FindNextFile();if(finder.IsDirectory() && !finder.IsDots()){//处理文件夹myDeleteDirectory(finder.GetFilePath()); //递归删除文件夹RemoveDirectory(finder.GetFilePath());}else{//处理文件DeleteFile(finder.GetFilePath());}}
}


10、CList设定水平拖动

void SetHorizontalScroll()
{CDC* dc &＃61; GetDC();SIZE s;int index;CString str;long temp;for (index &＃61; 0; indexGetTextExtent(str, str.GetLength() &＃43; 1); // 获取字符串的像素大小// 如果新的字符串宽度大于先前的水平滚动条宽度&＃xff0c;则重新设置滚动条宽度// IDC_LISTBOX为m_List的资源IDtemp &＃61; (long)SendDlgItemMessage(IDC_LIST_LOG, LB_GETHORIZONTALEXTENT, 0, 0); //temp得到滚动条的宽度if (s.cx > temp){SendDlgItemMessage(IDC_LIST_LOG, LB_SETHORIZONTALEXTENT, (WPARAM)s.cx, 0);}}ReleaseDC(dc);
}


11 、利用分隔符分隔字符串

//字符串处理部分
void GetStrArrayFromString(TCHAR cSeparator, CStringArray &saTag, CString sSource)
{saTag.RemoveAll();int nPreIndex&＃61;-1, nNextIndex;while((nNextIndex&＃61;sSource.Find(cSeparator, nPreIndex&＃43;1))>-1){CString sName &＃61; sSource.Mid(nPreIndex&＃43;1, nNextIndex-nPreIndex-1);saTag.Add(sName );nPreIndex &＃61; nNextIndex;}//允许最后以逗号或不以逗号结尾int nLen &＃61; sSource.GetLength();if(nPreIndex&＃43;1}


12、是否是文件夹

bool IsDir(LPCTSTR filePath)
{DWORD ftyp &＃61; GetFileAttributes(filePath);if (ftyp & FILE_ATTRIBUTE_DIRECTORY){// 这是一个文件夹return true;}return false;
}


12、是否是大文件

bool IsBigFile(std::string sName)
{wstring wsName &＃61; string2wstring(sName);CString strName &＃61; wsName.c_str();const char* cName &＃61; sName.c_str();FILE* m_fp;errno_t err &＃61; fopen_s(&m_fp, cName, "rb");if (err !&＃61; 0){CString sMsg;sMsg.Format(_T("文件“%s”打开失败&＃xff0c;错误码&＃xff1a;0x%X"),strName, GetLastError());AfxMessageBox(sMsg);return false;}fseek(m_fp, 0, SEEK_END);long uTotalSize &＃61; ftell(m_fp);fseek(m_fp, 0, SEEK_SET);if (uTotalSize <5) // 小于5字节认为空文件{CString sMsg;sMsg.Format(_T("文件“%s”为空&＃xff0c;请检查文件&＃xff01;"),strName);AfxMessageBox(sMsg);fclose(m_fp);m_fp &＃61; NULL;return false;}// 大于100M定义为大文件if (uTotalSize > 100 * 1024 *1024){fclose(m_fp);m_fp &＃61; NULL;return true;}fclose(m_fp);m_fp &＃61; NULL;return false;
}