|
Exported functions can be called (or, rather, located and addressed) from the outside - so, whenever you need a function to be addressable from the outside you (or compiler/linker) make it exported. This is the only rule 
|
|
|
|
|
Hii
In my application , wanna copy all files from one partition to another partition.
First I copied a file that I taken default and copied to another partition.
The above operation is done by using the control code "FSCTL_GET_RETRIEVAL_POINTERS".
The clusters used are read and wrote into destination volume using readfile() and writefile() windows functions.
Now I gotta copy all files.....
So how to proceed ....??
Thanking you.
|
|
|
|
|
Hi krish,
krish_kumar wrote: So how to proceed ....??
Why are you using DeviceIoControl to copy files? Are you doing this from usermode or ring0/kernelmode?
Best Wishes,
-David Delaune
|
|
|
|
|
|
Well, if you're in user-mode, just iterate through *all* the files in the partition, read them into memory and write them into the other partition. Not tricky.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
|
|
|
|
|
krish_kumar wrote: I use it in user mode.
Yes, I remember you now. Your the guy who has been asking this question in all of the kernelmode driver forums for the last few weeks. 
Doron Holan over at Microsoft and many other highly respected engineers have given you the same advice. You should just copy the partition from usermode using the standard functions. Your not going to get much benefit from using kernel functions from usermode.
Now with that being said, what exactly are you having problems with? You state in this post[^]
I used the "FSCTL_GET_VOLUME_BITMAP" to get the cluster usage details.And I'm
getting the used and free cluster counts correctly.And the cluster number I got
is continuous.This makes problem for me. I wanna copy the used clusters to a
different partition.
Mark Roddy over at Microsoft wrote an article about finding and copying disk sectors. Have you read it?
Adventures in Luserland: Finding Disk Sectors Associated with File Records.[^]
Best Wishes,
-David Delaune
|
|
|
|
|
Hii
First I started with kernel mode and after that as per replies from Mr.Doron Holan Presently I do my application in user mode only.
In Mark Roddy's article ,takes each file handle and it's appropriate clusters.
So here in my program I took a sample file and get it's corrresponding cluster
details using "FSCTL_GET_RETRIEVAL_POINTERS" along with DeviceIoControl and copied it into another partition.
And this successfully copied the source file .
Like this I wanna get all files.So it may take much more time..?
How to get all file one by one.?
And I tried one more way using "FSCTL_GET_VOLUME_BITMAP"along with DeviceIoControl.In this case I take the
whole volume as handle to createfile() and find out the used cluster only;and simply copied them to another partition.After that I can't open some folders in the destination partition...
Here I'm not reinitializing links among them...and have to reallocate MFT..?
Thanking you...
|
|
|
|
|
krish_kumar wrote: I took a sample file and get it's corrresponding cluster
details using "FSCTL_GET_RETRIEVAL_POINTERS" along with DeviceIoControl and copied it into another partition.
And this successfully copied the source file .
Like this I wanna get all files.So it may take much more time..?
Yes. Of course it will take more time if you are enumerating all files/directories and copy them individually via FSCTL_GET_RETRIEVAL_POINTERS ReadFile/WriteFile. Your wasting your time here. Your other method which read the partition in 50MB increments will probably be faster.
krish_kumar wrote: How to get all file one by one.?
What is preventing you from enumerating all files? If you can copy 1 file... why not 2? If you can copy 2 files... why not 20,000? Are you having trouble enumerating files?
krish_kumar wrote: And I tried one more way using "FSCTL_GET_VOLUME_BITMAP"along with DeviceIoControl.In this case I take the
whole volume as handle to createfile() and find out the used cluster only;and simply copied them to another partition.
Without seeing your code I cannot possibly know what you did wrong. However as others have stated... there is alot of complexity involved. The NTFS $MFT contains logical offsets which map to physical locations. In addition.. you are dealing with logical and physical offsets[^] when dealing with the $Bitmap.
I dont want to discourage you. I am sure you have a valid reason why you want to copy a 2GB partition in 5 seconds rather than 10 seconds. I believe that using FSCTL_GET_VOLUME_BITMAP to get a list of all used clusters and copy only the used clusters may work. However you need to put the clusters back into the same offsets on the new partition.
What does your FSCTL_GET_VOLUME_BITMAP code look like? Are you trying to copy all of the used clusters onto the new partition in a contiguous stream? Keep in mind that you need to preserve the offsets. Can you show some code?
Good Luck,
-David Delaune
|
|
|
|
|
#include "WinIoCtl.h"
#include "stdio.h"
#include "ntddvol.h"
#include "stdafx.h"
#include "Cluster_Used_Logical_to_Phy_Ofst.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
CWinApp theApp;
using namespace std;
DWORD BytesReturned,dwBytesReturnedh;
LARGE_INTEGER li_add;
int i=0;
UINT32 *BitmapDetail;
DWORD dwError;
LPDWORD lpBytesReturned;
int iCopy_Count=0;
LONGLONG llCountUsed=0;
LONGLONG llCountFree=0;
LONGLONG llTotalCount=0;
LONGLONG llChunk_Size=512;
LONGLONG Rest_Size=llVolume_Size;
LONGLONG dwclusterSizeInBytes=512;
LPVOID bBuffer1 = VirtualAlloc(NULL,512,MEM_COMMIT,PAGE_READWRITE);
BOOL IsClusterUsed (UINT64 Cluster)
{
return ((BitmapDetail[Cluster / 32] & (1<< (Cluster % 32))) ? TRUE : FALSE);
}
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
if(!AfxWinInit(::GetModuleHandle(NULL), NULL,::GetCommandLine(), 0))
{
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
HANDLE h_MyDrive_Src,h_MyDrive_Dest,hDevice;
DWORD dwRetBytes1,dwRetBytes2;
hDevice = CreateFile( _T("\\\\.\\PhysicalDrive0"),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if (hDevice==INVALID_HANDLE_VALUE)
{
printf("\nUnable to Open the Device: Error Number is : %d\n",GetLastError());
}
h_MyDrive_Src = CreateFile( L"\\\\.\\H:",
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_NO_BUFFERING,
NULL);
if (h_MyDrive_Src==INVALID_HANDLE_VALUE)
{
printf("\nUnable to Open Device: Error No: %d\n",GetLastError());
}
h_MyDrive_Dest=CreateFile( L"\\\\.\\I:",
GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL|FILE_FLAG_NO_BUFFERING,
NULL);
if (h_MyDrive_Dest==INVALID_HANDLE_VALUE)
{
printf("\nUnable to Open Device: Error Number:%d\n",GetLastError());
}
STARTING_LCN_INPUT_BUFFER StartingLCN;
VOLUME_BITMAP_BUFFER *Bitmap = NULL;
UINT32 BitmapSize;
DWORD BytesReturned1;
BOOL Result;
ULONGLONG ClusterCount = 0;
StartingLCN.StartingLcn.QuadPart = 0;
BitmapSize = sizeof (VOLUME_BITMAP_BUFFER) + 4;
Bitmap = (VOLUME_BITMAP_BUFFER *) malloc (BitmapSize);
Result = DeviceIoControl(h_MyDrive_Src,
FSCTL_GET_VOLUME_BITMAP,
&StartingLCN,
sizeof (StartingLCN),
Bitmap,
BitmapSize,
&BytesReturned1,
NULL);
if (Result == FALSE &&GetLastError()!= ERROR_MORE_DATA)
{
free (Bitmap);
goto label12;
}
ClusterCount = Bitmap->BitmapSize.QuadPart -
Bitmap->StartingLcn.QuadPart;
cout<<"\n Tot no of clusters :"<<ClusterCount<<"\n";
BitmapSize = sizeof (VOLUME_BITMAP_BUFFER) + (Bitmap->;BitmapSize.QuadPart / 8) + 1;
Bitmap = (VOLUME_BITMAP_BUFFER *) realloc (Bitmap, BitmapSize);
Result = DeviceIoControl(h_MyDrive_Src,
FSCTL_GET_VOLUME_BITMAP,
&StartingLCN,
sizeof (StartingLCN),
Bitmap,
BitmapSize,
&BytesReturned,
NULL);
DWORD LastError = GetLastError ();
if (Result == FALSE)
{
printf ("\nCouldn't properly read volume bitmap\n");
free (Bitmap);
goto label12;
}
BitmapDetail = (UINT32 *) malloc (sizeof(UINT32) * (1 + (ClusterCount / 32)));
memcpy (BitmapDetail, Bitmap->Buffer, sizeof(UINT32) * (1 + (ClusterCount / 32)));
UINT64 Max;
UINT64 cc;
Max=ClusterCount;
UINT64 usedcluster=0;
LONGLONG llReturnValue = 0;
for (cc = 0; cc< Max; cc++)
{
if ( IsClusterUsed (cc))
{
llCountUsed++;
printf("\n used %I64d",llCountUsed);
llTotalCount++;
LARGE_INTEGER li_Lcn;
li_Lcn.QuadPart=(LONGLONG)cc;
VOLUME_LOGICAL_OFFSET logicalOffset;
logicalOffset.LogicalOffset= li_Lcn.QuadPart *dwclusterSizeInBytes;
VOLUME_PHYSICAL_OFFSETS physicalOffsets;
DWORD dw_Bytes_Returned;
if (!DeviceIoControl(h_MyDrive_Src,
IOCTL_VOLUME_LOGICAL_TO_PHYSICAL,
&logicalOffset,
sizeof(VOLUME_LOGICAL_OFFSET),
&physicalOffsets,
sizeof(VOLUME_PHYSICAL_OFFSETS),
&dw_Bytes_Returned,
NULL) )
{
printf("\n Error occoured :%d",GetLastError));
goto label12;
}
llReturnValue += physicalOffsets.PhysicalOffset [0].Offset;
printf("\n physical offsets = %I64d",llReturnValue);
if(!SetFilePointer(hDevice,llReturnValue,NULL,0))
{
printf("\nSetFilePointer Failed: Error Number : %d\n",GetLastError());
}
if(!ReadFile(hDevice,bBuffer1,llChunk_Size,&dwRetBytes1,0))
{
printf("\nUnable to Read ( src _ handle disk) the Drive Error: %d\n",GetLastError());
}
if(!WriteFile(h_MyDrive_Dest,bBuffer1,llChunk_Size,&dwRetBytes2,0))
{
printf("\nUnable towrite the Drive Error:%d\n",GetLastError());
}
}
else
{ llCountFree++;
llTotalCount++;
}
}
cout<<"\n Total no of clusters :"<<llTotalCount<<"\n";
cout<<"\n Used no of clusters :"<<llCountUsed<<"\n";
cout<<"\n Free no of clusters :"<<llCountFree<<"\n";
CloseHandle(h_MyDrive_Src);
CloseHandle(h_MyDrive_Dest);
BOOL bupdate= DeviceIoControl(hDevice,
IOCTL_DISK_UPDATE_PROPERTIES,
NULL,
NULL,
NULL,
NULL,
&dwBytesReturnedh,
NULL);
CloseHandle(hDevice);
label12:
cout<<"\n Press any key to continue...........\n\n";
char c=getchar();
}
return nRetCode;
}
In the above code I have not touch MFT ,simply copied ; I think that is my problem.And you suggested that the logical offsets must represent the corresponding physical offsets; And I have converted the logical offset to physical.That physical offests returning are giving correct values.
Result
I:\ is not accessible
The file or directory is corrupted and unreadble.
modified on Tuesday, June 16, 2009 9:10 AM
|
|
|
|
|
Don't Be Afraid of seeing my code - Krish : no time for fear
Don't Be Afraid of seeing my code - Krish : no time for fear
Don't Be Afraid of seeing my code - Krish : no time for fear
Don't Be Afraid of seeing my code - Krish : no time for fear
|
|
|
|
|
Hi,
May i know why c++ doesn"t have virtual constructor...and why virtual destructors are present...?
|
|
|
|
|
The "virtual" mechanism depends on the VTable, which will be setup by the constructor. So, the constructor itself cannot be virtual (not with C++), even though you could try something like this[^]. The link that I've provided to you is among one of the best C++ FAQs on the internet. You may as well refer to it to read about Virtual destructors and other basic C++ stuff.
It is a crappy thing, but it's life -^ Carlo Pallini
|
|
|
|
|
In addition to Rajesh' reply: when you construct your object, you always know the type of object you want to create at that time (you always call a specific constructor, not the one from the base class). So, it doesn't make sense to have a virtual constructor.
Virtual destructors make more sense: when you destroy your object, you often manipulate objects as a pointer to their base class (typical scenario where polymorphism is used). In that case, you want to call the correct version of your destructor.
|
|
|
|
|
Consider this Example
class Base
{
};
class Derived: public Base
{
};
Consider this Base *b = new Base()
This means we need to create a Base object we are really not worried on who has derived from Base.
Consider this Derived *d = new Derived(); or Base *b = new Derived();
This mean we want a derived object and by default the base class constructor is called before the Derived.
So there is no use of virtual constructors.
-Arun
|
|
|
|
|
Is it possible to write an array function that returns long strings (300-600 characters) in Excel? I have tried writing a C++ dll with Excel C API and also using VBA, but get #VALUE! error if I do not truncate the strings to 255 characters. Using VBA, I have found that it is possible for single cell function.
For I = 1 To 2056
Query = Query & "A"
Next I
LongStringFunction = Query
modified on Saturday, June 13, 2009 5:25 AM
|
|
|
|
|
Hello!
Firstly, this has nothing to do with C++. But since that you're here, I'll propose a C++ solution, which will work if a cell has more than 255 characters. I've used this class and it just works: BasicExcel - A Class to Read and Write to Microsoft Excel[^]
There may be drawbacks and gotchas, but I'll expect you to read through the article to understand it.
It is a crappy thing, but it's life -^ Carlo Pallini
|
|
|
|
|
Thanks; I'll give the article a read as I'm always interested in other ways to control excel.
I've clarified my question; I am trying to write a C++ dll using Excel C API.
VARIANT _stdcall TestFunction(VARIANT ARG1, VARIANT ARG2); //results may contain strings between 300-600 characters.
|
|
|
|
|
TedChangKorea wrote: I've clarified my question; I am trying to write a C++ dll using Excel C API.
In that case, I hope the XLW wrapper would be a great reference to you: XLW[^]. Unless you are wanting to rewrite the whole thing, you might as well use XLW to build your DLL.
It is a crappy thing, but it's life -^ Carlo Pallini
|
|
|
|
|
Thanks; XLW looks like it should work. I was able to make a quick single cell function that returned a long string. I am going to try using the XLW's CellMatrix to see if I can get an array function to work with long strings.
|
|
|
|
|
It does work and it's a pretty nifty class if you ask me.
It is a crappy thing, but it's life -^ Carlo Pallini
|
|
|
|
|
Which version of XLW are you using ?
|
|
|
|
|
I am trying to make an smart device MFC application using VS2005. The
VS2005 gave Pocket PC 2003 + some other ones as SDK. But i wanted to make my own SDK and make it work. Why I
wanted this way was that, I have created an OS image ( I had given set
sysgen_mfc=1). Also I created a sample SDK. So I can build my smart
device application using sample sdk , Then download the image. Now i can make the application work fine and for debugging the same I can use emulator.
But I am getting these errors while compling "stdafx.cpp"
C:\Program Files\Windows
CETools\wce600\SDK2\include\ARMV4I\malloc.h(45) : error C2143: syntax
error : missing ',' before '*'
D:\Program Files\Microsoft Visual Studio
8\VC\ce\atlmfc\include\atltime.h(403) : error C3861: 'wcsftime':
identifier not found
D:\Program Files\Microsoft Visual Studio
8\VC\ce\atlmfc\include\atltime.h(430) : error C3861: 'wcsftime':
identifier not found
D:\Program Files\Microsoft Visual Studio
8\VC\ce\atlmfc\include\atlcomtime.h(367) : error C3861: 'wcsftime':
identifier not found
Can anyone know what to do, to resolve these errors.
thanks
|
|
|
|
|
This seems to be compilation error because of not including correct header files.
Try including the required header files in stdafx.h
|
|
|
|
|
Recently i have made a program to apply an neural network 'AND' gate that works like a logical 'AND' gate in c language. here i changed the bias value with fixed weights variable.
but now i want to change both bias and weight value for this problem. i need code. i will be grateful if anybody helps me.
here is the code of my program
#include<stdio.h>
#include<conio.h>
#define true 1
#define false 0
void main()
{
clrscr();
int i,store[10],z=false,p,l=0,k=0,x1[4]={0,0,1,1},x2[4]={0,1,0,1},w1=1,w2=1,out[4]={0,0,0,1},check=0;
float bias=0.0,result;
printf("\n");
while(z==false)
{
for(i=0;i<4;i++)
if((x1[i]*w1+x2[i]*w2+bias)<0)
store[i]=0;
else
store[i]=1;
printf("\n");
for(i=0;i<4;i++)
printf("%d",store[i]);
printf("\tbias value\t");
printf("%f",bias);
check=0;
for(i=0;i<4;i++)
{
if(out[i]!=store[i])
{
if(store[i]==1)
bias=bias-.05;
else
bias=bias+.05;
z=false;
}
else
{
check++;
if(check==4)
z=true;
else
z=false;
}
}
}
getch();
}
|
|
|
|
|
Hi,
I've been trying to search a multidimensional array and have been unsuccessful.
I get the following error:
"Only single dimension arrays are supported here."
using this code:
Array.IndexOf(serverRecords, x);
where serverRecords is 2d array.
Anyone know how to do this??
Any help would be greatly appreciated!
-Paul C.
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
