Call WINAPI to implement large file segmentation

Not much said, 10g+ 's SQL Test segmentation success, each block size not more than 1G good.

Code by pnig0s1992//date:2012,3,18 #include <stdio.h> #include <Windows.h> #define MAXLENGTH  
    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) get file handle failed%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 File:%s size:%i64d KB, Lpfilename,uli.)  
        quadpart/1024);  
    printf ("\ n chunking Size:%u KB chunking:%u", (dwblockbytes/1024), fi.dwpartnum);  
    } HANDLE Hfilemap; Hfilemap = createfilemapping (hfile,null,page_readonly,0,0,null)///If the file fails if (Hfilemap = = NULL) {p rintf (\ n Create file Map object handle failed:%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) failed to map target file to memory:%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) Get the block file object handle failed:%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 get chunk file memory mapped object handle failed:%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) failed to map block file to memory:%d.  
            ", GetLastError ());  
            UnmapViewOfFile (Lpmapstartpos);  
            CloseHandle (HNEWFILEMAP);  
            CloseHandle (Hnewfile);  
            CloseHandle (HFILEMAP);  
            CloseHandle (hfile);  
        return-1;  
        } copymemory (Lpnewfilepos,lpmapstartpos,dwblockbytes); printf ("\ n block file%s was successfully generated.)  
        ", STEMPSTR);  
        CloseHandle (HNEWFILEMAP);  
        CloseHandle (Hnewfile);  
        UnmapViewOfFile (Lpmapstartpos);  
     
    UnmapViewOfFile (Lpnewfilepos);  
    } closehandle (Hfilemap);  
    CloseHandle (hfile); SystEM ("pause");  
return 0; }

This article is from the "About:blank h4cking" blog, please be sure to keep this source http://pnig0s1992.blog.51cto.com/393390/809886