源码：windows文件分割与合并

标签：windows 文件读写 文件分割 合并

#include 
#include 
#include 
using namespace std;

//判断文件是否存在
bool FileExistsW(const wstring &fn)
{
    WIN32_FIND_DATAW fd;
    HANDLE hFile = FindFirstFileW(fn.c_str(),&fd);
    if (hFile != INVALID_HANDLE_VALUE)
    {
        ::FindClose(hFile);
        return true;
    }
    return false;
}

//判断目录是否存在
bool DirectoryExistsW(const wstring &fn)
{
    //  return PathFileExistsA(fn.c_str());
    DWORD Code = GetFileAttributesW(fn.c_str());
    return (Code != INVALID_FILE_ATTRIBUTES) && ((FILE_ATTRIBUTE_DIRECTORY & Code) != 0);
}

//目录+反斜杠
wstring IncludeTrailingPathDelimiterW(const wstring &path)
{
    wstring s = path;
    if (s.empty())
        return s;
    if (s[s.length()-1] != L'\\')
        return s+L"\\";
    else
        return s;  
}

//获取路径的文件名
wstring ExtractFileNameW(const wstring &filestr)
{
    if (filestr.empty())
        return L"";
    for(int i = filestr.length()-1; i>=0; --i)
    {
        if (filestr[i] == L'\\')
        {
            return filestr.substr(i+1);
        }
    }
    return L"";
}


std::wstring IntToStrW( const int i )
{
    wchar_t buf[16]={0};
    _itow_s(i,buf,10);
    return wstring(buf);
}

inline void IncPtr(void **p,int i)
{  
    *p = (void*)((int)*p + i);
}
//分割文件
bool BreakFile(const wchar_t *fn,unsigned long block_size,const wchar_t *save_path)
{
    if(!FileExistsW(fn))
        return false;
    if(!DirectoryExistsW(save_path))
        return false;
    if(block_size = block_size)
        {
            ::CloseHandle(hfw);
            ++iblock;
            fblock = IncludeTrailingPathDelimiterW(save_path)+ ExtractFileNameW(fn)+L".part"+IntToStrW(iblock);
            hfw = CreateFileW(fblock.c_str(),GENERIC_READ|GENERIC_WRITE,0,NULL,CREATE_NEW,FILE_ATTRIBUTE_NORMAL,0);
            if(INVALID_HANDLE_VALUE == hfw)
            {
                CloseHandle(hf);
                return false;
            }
            dwWrited = 0;
        }
        IncPtr(&p,iseek);
        dwToWrite = min(dwRemain,block_size - dwWrited);
        dwWritedTemp = 0;
        if(FALSE == WriteFile(hfw,p,dwToWrite,&dwWritedTemp,NULL))
            break;
        dwWrited += dwWritedTemp;
        if(dwRemain > dwWritedTemp)
            dwRemain = dwRemain - dwWritedTemp;
        else
            dwRemain = 0;
        iseek = dwWritedTemp;
        if(dwRemain > 0)
            goto label_rewrite;


        dwReaded = 0;
    }

    ::CloseHandle(hfw);
    ::CloseHandle(hf);

    return true;

}



//合并文件
bool CombineFiles(const vector &files,const wstring &destfile)
{
    if(FileExistsW(destfile))
        return false;
    if(files.empty())
        return false;
    HANDLE hf = CreateFileW(destfile.c_str(),GENERIC_READ|GENERIC_WRITE,0,NULL,CREATE_NEW,FILE_ATTRIBUTE_NORMAL,0);
    if(INVALID_HANDLE_VALUE == hf)
        return false;
    HANDLE hfr = INVALID_HANDLE_VALUE;
    unsigned char buf[8192];
    DWORD dwReaded = 0,dwToWrite = 0,dwWrited = 0,dwRemain = 0,dwWritedTemp = 0;
    LONGLONG dwFileSize = 0,dwDestSize = 0;
    LARGE_INTEGER li;
    void *p=NULL;
    int iseek = 0;
    for(size_t i = 0; i dwWritedTemp)
            dwRemain = dwRemain = dwWritedTemp;
        else
            dwRemain = 0;
        iseek = dwWritedTemp;
        if(dwRemain>0)
            goto label_rewrite;   
        goto label_read;
    }
    if(INVALID_HANDLE_VALUE!=hfr)
        CloseHandle(hfr);
    CloseHandle(hf);
    return true;
}

源码：windows文件分割与合并,搜素材,soscw.com

源码：windows文件分割与合并

标签：windows 文件读写 文件分割 合并

原文地址：http://blog.csdn.net/truexf/article/details/37748551