调用WinApi实现超大文件分割

不多说了，10G+的Sql测试分割成功，每块大小不要超过1G就好了。

//Code by Pnig0s1992
//Date:2012,3,18
#include <stdio.h>
#include <Windows.h>  

#define MAXLENGTH 30  

int main(int argc,char * argv[])
{
    LPTSTR lpFileName = "xxx.sql";
    HANDLE hFile;
    struct FILEINFO
    {
        LONGLONG llFileSize;
        LONG llPartSize;
        DWORD dwPartNum;
    };  

    FILEINFO fi;
    fi.llFileSize = 0;
    fi.llPartSize = 0;
    fi.dwPartNum = 0;
    fi.llPartSize = 1024*1024;
    hFile = CreateFile(lpFileName,GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
    if(hFile == INVALID_HANDLE_VALUE)
    {
        printf("\n获得文件句柄失败%d。",GetLastError());
        return -1;
    }  

    LARGE_INTEGER uli = {0};
    SYSTEM_INFO SysInfo;
    GetSystemInfo(&SysInfo);
    DWORD dwGran = SysInfo.dwAllocationGranularity;  

    LONGLONG qwFileOffset = 0;
    LONGLONG dwBlockBytes = fi.llPartSize;
    if(GetFileSizeEx(hFile,&uli))
    {
        fi.llFileSize = uli.QuadPart;
        fi.dwPartNum = fi.llFileSize/dwBlockBytes;
        if((fi.llFileSize%dwBlockBytes) != 0)
        {
            fi.dwPartNum+=1;
        }
        printf("\n文件:%s 大小为:%I64d KB",lpFileName,uli.QuadPart/1024);
        printf("\n分块大小:%u KB 分块数:%u",(dwBlockBytes/1024),fi.dwPartNum);
    }  

    HANDLE hFileMap;
    hFileMap = CreateFileMapping(hFile,NULL,PAGE_READONLY,0,0,NULL);//超大文件时该处失败
    if(hFileMap == NULL)
    {
        printf("\n创建文件映射对象句柄失败:%d。",GetLastError());
        CloseHandle(hFile);
        return -1;
    }  

    LPSTR sTempStr = (LPSTR)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,MAXLENGTH);
    for(int index = 0;index<fi.dwPartNum;index++)
    {
        LPVOID lpMapStartPos;
        if(fi.llFileSize < dwBlockBytes)
        {
            dwBlockBytes = fi.llFileSize;
        }
        lpMapStartPos = MapViewOfFile(hFileMap,FILE_MAP_READ,0,qwFileOffset,dwBlockBytes);
        if(lpMapStartPos == NULL)
        {
            printf("\n映射目标文件到内存失败:%d。",GetLastError());
            CloseHandle(hFileMap);
            CloseHandle(hFile);
            return -1;
        }
        qwFileOffset += dwBlockBytes;
        fi.llFileSize  -=  dwBlockBytes;  

        sprintf(sTempStr,"%s_%d",lpFileName,index+1);
        HANDLE hNewFile = CreateFile(sTempStr,GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
        if(hNewFile == INVALID_HANDLE_VALUE)
        {
            printf("\n获取分块文件对象句柄失败:%d。",GetLastError());
            UnmapViewOfFile(lpMapStartPos);
            CloseHandle(hFileMap);
            CloseHandle(hFile);
            return -1;
        }
        HANDLE hNewFileMap;
        hNewFileMap = CreateFileMapping(hNewFile,NULL,PAGE_READWRITE,0,dwBlockBytes,NULL);
        if(hNewFile == NULL)
        {
            printf("\n获取分块文件内存映射对象句柄失败:%d。",GetLastError());
            UnmapViewOfFile(lpMapStartPos);
            CloseHandle(hNewFile);
            CloseHandle(hFileMap);
            CloseHandle(hFile);
            return -1;
        }
        LPVOID lpNewFilePos = MapViewOfFile(hNewFileMap,FILE_MAP_WRITE,0,0,0);
        if(lpNewFilePos == NULL)
        {
            printf("\n映射分块文件到内存失败:%d。",GetLastError());
            UnmapViewOfFile(lpMapStartPos);
            CloseHandle(hNewFileMap);
            CloseHandle(hNewFile);
            CloseHandle(hFileMap);
            CloseHandle(hFile);
            return -1;
        }  

        CopyMemory(lpNewFilePos,lpMapStartPos,dwBlockBytes);
        printf("\n分块文件%s成功生成。",sTempStr);
        CloseHandle(hNewFileMap);
        CloseHandle(hNewFile);
        UnmapViewOfFile(lpMapStartPos);
        UnmapViewOfFile(lpNewFilePos);  

    }  

    CloseHandle(hFileMap);
    CloseHandle(hFile);
    system("pause");
    return 0;
}

本文出自 “About:Blank H4cking” 博客，请务必保留此出处http://pnig0s1992.blog.51cto.com/393390/809886

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