我应该创建两个CFile对象并将一个对象逐个字符复制到另一个对象中吗？或者图书馆里有什么可以为我做这件事的吗？
Tommy Herbert
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11250 次
4 回答
14
我只会使用CopyFileWin32 API 函数，但CFile::Open文档中的示例代码显示了如何使用CFile（几乎使用您建议的方法）复制文件。
于 2008-10-10T15:52:21.057 回答
3
这取决于你想做什么。复制文件有多种方法：
CopyFile()CopyFileEx()SHFileOperation()IFileOperationSHFileOperation()（在 Vista 中替换）
于 2008-10-14T05:07:11.013 回答
0
虽然我很欣赏前面的答案，但我发现这FileOperations是一个很好的包装器，它模仿了在 Windows 资源管理器中执行复制操作的方式，其中还包括复制、移动和删除文件以及重命名目录：
#include "stdafx.h"
#include "FileOperations.h"
//
// this code copy 'c:\source' directory and
// all it's subdirectories and files
// to the 'c:\dest' directory.
//
CFileOperation fo; // create object
fo.SetOverwriteMode(false); // reset OverwriteMode flag (optional)
if (!fo.Copy("c:\\source", "c:\\dest")) // do Copy
{
fo.ShowError(); // if copy fails show error message
}
//
// this code delete 'c:\source' directory and
// all it's subdirectories and files.
//
fo.Setucancode.netIfReadOnly(); // set ucancode.netIfReadonly flag (optional)
if (!fo.Delete("c:\\source")) // do Copy
{
fo.ShowError(); // if copy fails show error message
}
这是完整性的源代码：
#include "resource.h"
#define PATH_ERROR -1
#define PATH_NOT_FOUND 0
#define PATH_IS_FILE 1
#define PATH_IS_FOLDER 2
class CFExeption
{
public:
CFExeption(DWORD dwErrCode);
CFExeption(CString sErrText);
CString GetErrorText() {return m_sError;}
DWORD GetErrorCode() {return m_dwError;}
private:
CString m_sError;
DWORD m_dwError;
};
//*****************************************************************************************************
class CFileOperation
{
public:
CFileOperation(); // constructor
bool Delete(CString sPathName); // delete file or folder
bool Copy(CString sSource, CString sDest); // copy file or folder
bool Replace(CString sSource, CString sDest); // move file or folder
bool Rename(CString sSource, CString sDest); // rename file or folder
CString GetErrorString() {return m_sError;} // return error description
DWORD GetErrorCode() {return m_dwError;} // return error code
void ShowError() // show error message
{MessageBox(NULL, m_sError, _T("Error"), MB_OK | MB_ICONERROR);}
void SetAskIfReadOnly(bool bAsk = true) // sets behavior with readonly files(folders)
{m_bAskIfReadOnly = bAsk;}
bool IsAskIfReadOnly() // return current behavior with readonly files(folders)
{return m_bAskIfReadOnly;}
bool CanDelete(CString sPathName); // check attributes
void SetOverwriteMode(bool bOverwrite = false) // sets overwrite mode on/off
{m_bOverwriteMode = bOverwrite;}
bool IsOverwriteMode() {return m_bOverwriteMode;} // return current overwrite mode
int CheckPath(CString sPath);
bool IsAborted() {return m_bAborted;}
protected:
void DoDelete(CString sPathName);
void DoCopy(CString sSource, CString sDest, bool bDelteAfterCopy = false);
void DoFileCopy(CString sSourceFile, CString sDestFile, bool bDelteAfterCopy = false);
void DoFolderCopy(CString sSourceFolder, CString sDestFolder, bool bDelteAfterCopy = false);
void DoRename(CString sSource, CString sDest);
bool IsFileExist(CString sPathName);
void PreparePath(CString &sPath);
void Initialize();
void CheckSelfRecursion(CString sSource, CString sDest);
bool CheckSelfCopy(CString sSource, CString sDest);
CString ChangeFileName(CString sFileName);
CString ParseFolderName(CString sPathName);
private:
CString m_sError;
DWORD m_dwError;
bool m_bAskIfReadOnly;
bool m_bOverwriteMode;
bool m_bAborted;
int m_iRecursionLimit;
};
//*****************************************************************************************************
C++ 文件：
#include "stdafx.h"
#include "resource.h"
#include "FileOperations.h"
//************************************************************************************************************
CFExeption::CFExeption(DWORD dwErrCode)
{
LPVOID lpMsgBuf;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, dwErrCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&lpMsgBuf, 0, NULL);
m_sError = (LPTSTR)lpMsgBuf;
LocalFree(lpMsgBuf);
m_dwError = dwErrCode;
}
CFExeption::CFExeption(CString sErrText)
{
m_sError = sErrText;
m_dwError = 0;
}
//************************************************************************************************************
CFileOperation::CFileOperation()
{
Initialize();
}
void CFileOperation::Initialize()
{
m_sError = _T("No error");
m_dwError = 0;
m_bAskIfReadOnly = true;
m_bOverwriteMode = false;
m_bAborted = false;
m_iRecursionLimit = -1;
}
void CFileOperation::DoDelete(CString sPathName)
{
CFileFind ff;
CString sPath = sPathName;
if (CheckPath(sPath) == PATH_IS_FILE)
{
if (!CanDelete(sPath))
{
m_bAborted = true;
return;
}
if (!DeleteFile(sPath)) throw new CFExeption(GetLastError());
return;
}
PreparePath(sPath);
sPath += "*.*";
BOOL bRes = ff.FindFile(sPath);
while(bRes)
{
bRes = ff.FindNextFile();
if (ff.IsDots()) continue;
if (ff.IsDirectory())
{
sPath = ff.GetFilePath();
DoDelete(sPath);
}
else DoDelete(ff.GetFilePath());
}
ff.Close();
if (!RemoveDirectory(sPathName) && !m_bAborted) throw new CFExeption(GetLastError());
}
void CFileOperation::DoFolderCopy(CString sSourceFolder, CString sDestFolder, bool bDelteAfterCopy)
{
CFileFind ff;
CString sPathSource = sSourceFolder;
BOOL bRes = ff.FindFile(sPathSource);
while (bRes)
{
bRes = ff.FindNextFile();
if (ff.IsDots()) continue;
if (ff.IsDirectory()) // source is a folder
{
if (m_iRecursionLimit == 0) continue;
sPathSource = ff.GetFilePath() + CString("\\") + CString("*.*");
CString sPathDest = sDestFolder + ff.GetFileName() + CString("\\");
if (CheckPath(sPathDest) == PATH_NOT_FOUND)
{
if (!CreateDirectory(sPathDest, NULL))
{
ff.Close();
throw new CFExeption(GetLastError());
}
}
if (m_iRecursionLimit > 0) m_iRecursionLimit --;
DoFolderCopy(sPathSource, sPathDest, bDelteAfterCopy);
}
else // source is a file
{
CString sNewFileName = sDestFolder + ff.GetFileName();
DoFileCopy(ff.GetFilePath(), sNewFileName, bDelteAfterCopy);
}
}
ff.Close();
}
bool CFileOperation::Delete(CString sPathName)
{
try
{
DoDelete(sPathName);
}
catch(CFExeption* e)
{
m_sError = e->GetErrorText();
m_dwError = e->GetErrorCode();
delete e;
if (m_dwError == 0) return true;
return false;
}
return true;
}
bool CFileOperation::Rename(CString sSource, CString sDest)
{
try
{
DoRename(sSource, sDest);
}
catch(CFExeption* e)
{
m_sError = e->GetErrorText();
m_dwError = e->GetErrorCode();
delete e;
return false;
}
return true;
}
void CFileOperation::DoRename(CString sSource, CString sDest)
{
if (!MoveFile(sSource, sDest)) throw new CFExeption(GetLastError());
}
void CFileOperation::DoCopy(CString sSource, CString sDest, bool bDelteAfterCopy)
{
CheckSelfRecursion(sSource, sDest);
// source not found
if (CheckPath(sSource) == PATH_NOT_FOUND)
{
CString sError = sSource + CString(" not found");
throw new CFExeption(sError);
}
// dest not found
if (CheckPath(sDest) == PATH_NOT_FOUND)
{
CString sError = sDest + CString(" not found");
throw new CFExeption(sError);
}
// folder to file
if (CheckPath(sSource) == PATH_IS_FOLDER && CheckPath(sDest) == PATH_IS_FILE)
{
throw new CFExeption("Wrong operation");
}
// folder to folder
if (CheckPath(sSource) == PATH_IS_FOLDER && CheckPath(sDest) == PATH_IS_FOLDER)
{
CFileFind ff;
CString sError = sSource + CString(" not found");
PreparePath(sSource);
PreparePath(sDest);
sSource += "*.*";
if (!ff.FindFile(sSource))
{
ff.Close();
throw new CFExeption(sError);
}
if (!ff.FindNextFile())
{
ff.Close();
throw new CFExeption(sError);
}
CString sFolderName = ParseFolderName(sSource);
if (!sFolderName.IsEmpty()) // the source is not drive
{
sDest += sFolderName;
PreparePath(sDest);
if (!CreateDirectory(sDest, NULL))
{
DWORD dwErr = GetLastError();
if (dwErr != 183)
{
ff.Close();
throw new CFExeption(dwErr);
}
}
}
ff.Close();
DoFolderCopy(sSource, sDest, bDelteAfterCopy);
}
// file to file
if (CheckPath(sSource) == PATH_IS_FILE && CheckPath(sDest) == PATH_IS_FILE)
{
DoFileCopy(sSource, sDest);
}
// file to folder
if (CheckPath(sSource) == PATH_IS_FILE && CheckPath(sDest) == PATH_IS_FOLDER)
{
PreparePath(sDest);
char drive[MAX_PATH], dir[MAX_PATH], name[MAX_PATH], ext[MAX_PATH];
_splitpath(sSource, drive, dir, name, ext);
sDest = sDest + CString(name) + CString(ext);
DoFileCopy(sSource, sDest);
}
}
void CFileOperation::DoFileCopy(CString sSourceFile, CString sDestFile, bool bDelteAfterCopy)
{
BOOL bOvrwriteFails = FALSE;
if (!m_bOverwriteMode)
{
while (IsFileExist(sDestFile))
{
sDestFile = ChangeFileName(sDestFile);
}
bOvrwriteFails = TRUE;
}
if (!CopyFile(sSourceFile, sDestFile, bOvrwriteFails)) throw new CFExeption(GetLastError());
if (bDelteAfterCopy)
{
DoDelete(sSourceFile);
}
}
bool CFileOperation::Copy(CString sSource, CString sDest)
{
if (CheckSelfCopy(sSource, sDest)) return true;
bool bRes;
try
{
DoCopy(sSource, sDest);
bRes = true;
}
catch(CFExeption* e)
{
m_sError = e->GetErrorText();
m_dwError = e->GetErrorCode();
delete e;
if (m_dwError == 0) bRes = true;
bRes = false;
}
m_iRecursionLimit = -1;
return bRes;
}
bool CFileOperation::Replace(CString sSource, CString sDest)
{
if (CheckSelfCopy(sSource, sDest)) return true;
bool bRes;
try
{
bool b = m_bAskIfReadOnly;
m_bAskIfReadOnly = false;
DoCopy(sSource, sDest, true);
DoDelete(sSource);
m_bAskIfReadOnly = b;
bRes = true;
}
catch(CFExeption* e)
{
m_sError = e->GetErrorText();
m_dwError = e->GetErrorCode();
delete e;
if (m_dwError == 0) bRes = true;
bRes = false;
}
m_iRecursionLimit = -1;
return bRes;
}
CString CFileOperation::ChangeFileName(CString sFileName)
{
CString sName, sNewName, sResult;
char drive[MAX_PATH];
char dir [MAX_PATH];
char name [MAX_PATH];
char ext [MAX_PATH];
_splitpath((LPCTSTR)sFileName, drive, dir, name, ext);
sName = name;
int pos = sName.Find("Copy ");
if (pos == -1)
{
sNewName = CString("Copy of ") + sName + CString(ext);
}
else
{
int pos1 = sName.Find('(');
if (pos1 == -1)
{
sNewName = sName;
sNewName.Delete(0, 8);
sNewName = CString("Copy (1) of ") + sNewName + CString(ext);
}
else
{
CString sCount;
int pos2 = sName.Find(')');
if (pos2 == -1)
{
sNewName = CString("Copy of ") + sNewName + CString(ext);
}
else
{
sCount = sName.Mid(pos1 + 1, pos2 - pos1 - 1);
sName.Delete(0, pos2 + 5);
int iCount = atoi((LPCTSTR)sCount);
iCount ++;
sNewName.Format("%s%d%s%s%s", "Copy (", iCount, ") of ", (LPCTSTR)sName, ext);
}
}
}
sResult = CString(drive) + CString(dir) + sNewName;
return sResult;
}
bool CFileOperation::IsFileExist(CString sPathName)
{
HANDLE hFile;
hFile = CreateFile(sPathName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
if (hFile == INVALID_HANDLE_VALUE) return false;
CloseHandle(hFile);
return true;
}
int CFileOperation::CheckPath(CString sPath)
{
DWORD dwAttr = GetFileAttributes(sPath);
if (dwAttr == 0xffffffff)
{
if (GetLastError() == ERROR_FILE_NOT_FOUND || GetLastError() == ERROR_PATH_NOT_FOUND)
return PATH_NOT_FOUND;
return PATH_ERROR;
}
if (dwAttr & FILE_ATTRIBUTE_DIRECTORY) return PATH_IS_FOLDER;
return PATH_IS_FILE;
}
void CFileOperation::PreparePath(CString &sPath)
{
if(sPath.Right(1) != "\\") sPath += "\\";
}
bool CFileOperation::CanDelete(CString sPathName)
{
DWORD dwAttr = GetFileAttributes(sPathName);
if (dwAttr == -1) return false;
if (dwAttr & FILE_ATTRIBUTE_READONLY)
{
if (m_bAskIfReadOnly)
{
CString sTmp = sPathName;
int pos = sTmp.ReverseFind('\\');
if (pos != -1) sTmp.Delete(0, pos + 1);
CString sText = sTmp + CString(" is read olny. Do you want delete it?");
int iRes = MessageBox(NULL, sText, _T("Warning"), MB_YESNOCANCEL | MB_ICONQUESTION);
switch (iRes)
{
case IDYES:
{
if (!SetFileAttributes(sPathName, FILE_ATTRIBUTE_NORMAL)) return false;
return true;
}
case IDNO:
{
return false;
}
case IDCANCEL:
{
m_bAborted = true;
throw new CFExeption(0);
return false;
}
}
}
else
{
if (!SetFileAttributes(sPathName, FILE_ATTRIBUTE_NORMAL)) return false;
return true;
}
}
return true;
}
CString CFileOperation::ParseFolderName(CString sPathName)
{
CString sFolderName = sPathName;
int pos = sFolderName.ReverseFind('\\');
if (pos != -1) sFolderName.Delete(pos, sFolderName.GetLength() - pos);
pos = sFolderName.ReverseFind('\\');
if (pos != -1) sFolderName = sFolderName.Right(sFolderName.GetLength() - pos - 1);
else sFolderName.Empty();
return sFolderName;
}
void CFileOperation::CheckSelfRecursion(CString sSource, CString sDest)
{
if (sDest.Find(sSource) != -1)
{
int i = 0, count1 = 0, count2 = 0;
for(i = 0; i < sSource.GetLength(); i ++) if (sSource[i] == '\\') count1 ++;
for(i = 0; i < sDest.GetLength(); i ++) if (sDest[i] == '\\') count2 ++;
if (count2 >= count1) m_iRecursionLimit = count2 - count1;
}
}
bool CFileOperation::CheckSelfCopy(CString sSource, CString sDest)
{
bool bRes = false;
if (CheckPath(sSource) == PATH_IS_FOLDER)
{
CString sTmp = sSource;
int pos = sTmp.ReverseFind('\\');
if (pos != -1)
{
sTmp.Delete(pos, sTmp.GetLength() - pos);
if (sTmp.CompareNoCase(sDest) == 0) bRes = true;
}
}
return bRes;
}
于 2021-04-13T16:10:45.350 回答
0
代码中的 Copy 选项要求首先存在 dest 文件或文件夹，否则 if (CheckPath(sDest) == PATH_NOT_FOUND) 将始终导致错误。
于 2021-04-14T13:43:20.710 回答