Блокирование файла

#include<windows.h>
#include<iostream.h>
 
int main(){
    DWORD dwCount;
    HANDLE hFile;
    DWORD dwFileSize;
 
    hFile=CreateFile("C:\\Documents and Settings\\bberdybekov\\Private\\C++\\MyProjects\\FileBlock1\\Debug\\FileBlock.dat",
        GENERIC_WRITE,FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
 
    if(hFile==INVALID_HANDLE_VALUE){
        cerr<<"Create file failed."<<endl
            <<"The last error code: "<<GetLastError()<<endl;
        cout<<"Press any key to finish.";
        cin.get();
 
        return 0;
        
    }
 
    dwFileSize=GetFileSize(hFile,NULL);
 
    if(dwFileSize==-1){
        cerr<<"Get file size failed."<<endl
            <<"The last error code: "<<GetLastError()<<endl;
        CloseHandle(hFile);
        cout<<"Press any key to finish.";
        cin.get();
        return 0;
    }
    
    /*if(!LockFile(hFile,0,0,dwFileSize,0)){
        cerr<<"Lock file failed."
            <<"The last error code: "<<GetLastError()<<endl;
        CloseHandle(hFile);
        cout<<"Press any key to finish."<<endl;
        cin.get();
        return 0;
    }*/
    
    while(!LockFile(hFile,0,0,dwFileSize,0));
    cout<<"Now the file is locked."<<endl
        <<"Press any key to continue."<<endl;
    //cin.get();
 
    //SetFilePointer(hFile,0,NULL,FILE_END);
 
    for(int i=0;i<10;i++){
        cout<<i<<endl;
        SetFilePointer(hFile,0,NULL,FILE_END);
        WriteFile(hFile,&i,sizeof(i),&dwCount,NULL);
        Sleep(1000);
    }
 
    
    if(!UnlockFile(hFile,0,0,dwFileSize,0)){
        cerr<<"Unlock file failed."<<endl
            <<"The last error code: "<<GetLastError()<<endl;
        CloseHandle(hFile);
        cout<<"Press any key to finish.";
        cin.get();
        return 0;
    }
    cout<<"Now the file is unlocked."<<endl
        <<"Press any key to continue."<<endl;
    cin.get();
    CloseHandle(hFile);
 
    return 0;
}

hFile=CreateFile("C:\\Documents and Settings\\bberdybekov\\Private\\C++\\MyProjects\\FileBlock1\\Debug\\FileBlock.dat",
        GENERIC_WRITE,0x00000000,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);

while(!LockFile(hFile,0,0,dwFileSize,0));