C / C++ / MFC Discussion Boards

bob1697224-Feb-08 6:06

24-Feb-08 6:06

This is probably unrelated but the last time I checked, C/C++ was case sensitive.

Are you really getting this to compile? Some global variables are declared all caps then used locally in lowercase with no matching declaration so I'm guessing your referring to the global instance.

one example is...

int BC, KC, ROUNDS;

// Used as lowercase in some functions
bc
rounds

Re: AES Problem

bob1697224-Feb-08 7:29

bob16972

24-Feb-08 7:29

/* I had a few spare minutes so I gave it look. I removed
all the noise and cleaned it up a bit so I could
navigate it easily.

NOTE: Files renamed to...

key.txt
input.txt
encrypted.txt
output.txt

WARNING: You might have a problem toward the very end
of the encrypt or decrypt code. ---------------->
-13224404 -14211046 ... -2885500 -3082625 -33457977777
*/

#include <iostream.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <windows.h>
#include <string.h>
#include <memory.h>
#include <process.h>
#include <tchar.h>
#include <dos.h>
#include <conio.h>
#include <fstream>
#include <string>
#include <time.h>

using namespace std;

double Add,sub,sft,mix;
double Add1,Add2,Add3,sub1,sub2,sft1,sft2,mix1;
double invadd1,invadd2,invadd3,invsub1,invsub2,invsft1,invsft2,invmix1;

typedef unsigned char word8;
typedef unsigned int word32;

word8 Logtable[256] = {
0, 0, 25, 1, 50, 2, 26, 198, 75, 199, 27, 104, 51, 238, 223, 3,
100, 4, 224, 14, 52, 141, 129, 239, 76, 113, 8, 200, 248, 105, 28, 193,
125, 194, 29, 181, 249, 185, 39, 106, 77, 228, 166, 114, 154, 201, 9, 120,
101, 47, 138, 5, 33, 15, 225, 36, 18, 240, 130, 69, 53, 147, 218, 142,
150, 143, 219, 189, 54, 208, 206, 148, 19, 92, 210, 241, 64, 70, 131, 56,
102, 221, 253, 48, 191, 6, 139, 98, 179, 37, 226, 152, 34, 136, 145, 16,
126, 110, 72, 195, 163, 182, 30, 66, 58, 107, 40, 84, 250, 133, 61, 186,
43, 121, 10, 21, 155, 159, 94, 202, 78, 212, 172, 229, 243, 115, 167, 87,
175, 88, 168, 80, 244, 234, 214, 116, 79, 174, 233, 213, 231, 230, 173, 232,
44, 215, 117, 122, 235, 22, 11, 245, 89, 203, 95, 176, 156, 169, 81, 160,
127, 12, 246, 111, 23, 196, 73, 236, 216, 67, 31, 45, 164, 118, 123, 183,
204, 187, 62, 90, 251, 96, 177, 134, 59, 82, 161, 108, 170, 85, 41, 157,
151, 178, 135, 144, 97, 190, 220, 252, 188, 149, 207, 205, 55, 63, 91, 209,
83, 57, 132, 60, 65, 162, 109, 71, 20, 42, 158, 93, 86, 242, 211, 171,
68, 17, 146, 217, 35, 32, 46, 137, 180, 124, 184, 38, 119, 153, 227, 165,
103, 74, 237, 222, 197, 49, 254, 24, 13, 99, 140, 128, 192, 247, 112, 7,
};

word8 Alogtable[256] = {
1, 3, 5, 15, 17, 51, 85, 255, 26, 46, 114, 150, 161, 248, 19, 53,
95, 225, 56, 72, 216, 115, 149, 164, 247, 2, 6, 10, 30, 34, 102, 170,
229, 52, 92, 228, 55, 89, 235, 38, 106, 190, 217, 112, 144, 171, 230, 49,
83, 245, 4, 12, 20, 60, 68, 204, 79, 209, 104, 184, 211, 110, 178, 205,
76, 212, 103, 169, 224, 59, 77, 215, 98, 166, 241, 8, 24, 40, 120, 136,
131, 158, 185, 208, 107, 189, 220, 127, 129, 152, 179, 206, 73, 219, 118, 154,
181, 196, 87, 249, 16, 48, 80, 240, 11, 29, 39, 105, 187, 214, 97, 163,
254, 25, 43, 125, 135, 146, 173, 236, 47, 113, 147, 174, 233, 32, 96, 160,
251, 22, 58, 78, 210, 109, 183, 194, 93, 231, 50, 86, 250, 21, 63, 65,
195, 94, 226, 61, 71, 201, 64, 192, 91, 237, 44, 116, 156, 191, 218, 117,
159, 186, 213, 100, 172, 239, 42, 126, 130, 157, 188, 223, 122, 142, 137, 128,
155, 182, 193, 88, 232, 35, 101, 175, 234, 37, 111, 177, 200, 67, 197, 84,
252, 31, 33, 99, 165, 244, 7, 9, 27, 45, 119, 153, 176, 203, 70, 202,
69, 207, 74, 222, 121, 139, 134, 145, 168, 227, 62, 66, 198, 81, 243, 14,
18, 54, 90, 238, 41, 123, 141, 140, 143, 138, 133, 148, 167, 242, 13, 23,
57, 75, 221, 124, 132, 151, 162, 253, 28, 36, 108, 180, 199, 82, 246, 1,
};

word8 S[256] = {
99, 124, 119, 123, 242, 107, 111, 197, 48, 1, 103, 43, 254, 215, 171, 118,
202, 130, 201, 125, 250, 89, 71, 240, 173, 212, 162, 175, 156, 164, 114, 192,
183, 253, 147, 38, 54, 63, 247, 204, 52, 165, 229, 241, 113, 216, 49, 21,
4, 199, 35, 195, 24, 150, 5, 154, 7, 18, 128, 226, 235, 39, 178, 117,
9, 131, 44, 26, 27, 110, 90, 160, 82, 59, 214, 179, 41, 227, 47, 132,
83, 209, 0, 237, 32, 252, 177, 91, 106, 203, 190, 57, 74, 76, 88, 207,
208, 239, 170, 251, 67, 77, 51, 133, 69, 249, 2, 127, 80, 60, 159, 168,
81, 163, 64, 143, 146, 157, 56, 245, 188, 182, 218, 33, 16, 255, 243, 210,
205, 12, 19, 236, 95, 151, 68, 23, 196, 167, 126, 61, 100, 93, 25, 115,
96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184, 20, 222, 94, 11, 219,
224, 50, 58, 10, 73, 6, 36, 92, 194, 211, 172, 98, 145, 149, 228, 121,
231, 200, 55, 109, 141, 213, 78, 169, 108, 86, 244, 234, 101, 122, 174, 8,
186, 120, 37, 46, 28, 166, 180, 198, 232, 221, 116, 31, 75, 189, 139, 138,
112, 62, 181, 102, 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158,
225, 248, 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40, 223,
140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84, 187, 22,
};

word8 Si[256] = {
82, 9, 106, 213, 48, 54, 165, 56, 191, 64, 163, 158, 129, 243, 215, 251,
124, 227, 57, 130, 155, 47, 255, 135, 52, 142, 67, 68, 196, 222, 233, 203,
84, 123, 148, 50, 166, 194, 35, 61, 238, 76, 149, 11, 66, 250, 195, 78,
8, 46, 161, 102, 40, 217, 36, 178, 118, 91, 162, 73, 109, 139, 209, 37,
114, 248, 246, 100, 134, 104, 152, 22, 212, 164, 92, 204, 93, 101, 182, 146,
108, 112, 72, 80, 253, 237, 185, 218, 94, 21, 70, 87, 167, 141, 157, 132,
144, 216, 171, 0, 140, 188, 211, 10, 247, 228, 88, 5, 184, 179, 69, 6,
208, 44, 30, 143, 202, 63, 15, 2, 193, 175, 189, 3, 1, 19, 138, 107,
58, 145, 17, 65, 79, 103, 220, 234, 151, 242, 207, 206, 240, 180, 230, 115,
150, 172, 116, 34, 231, 173, 53, 133, 226, 249, 55, 232, 28, 117, 223, 110,
71, 241, 26, 113, 29, 41, 197, 137, 111, 183, 98, 14, 170, 24, 190, 27,
252, 86, 62, 75, 198, 210, 121, 32, 154, 219, 192, 254, 120, 205, 90, 244,
31, 221, 168, 51, 136, 7, 199, 49, 177, 18, 16, 89, 39, 128, 236, 95,
96, 81, 127, 169, 25, 181, 74, 13, 45, 229, 122, 159, 147, 201, 156, 239,
160, 224, 59, 77, 174, 42, 245, 176, 200, 235, 187, 60, 131, 83, 153, 97,
23, 43, 4, 126, 186, 119, 214, 38, 225, 105, 20, 99, 85, 33, 12, 125,
};

word32 RC[30] = {
0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e,
0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d,
0xfa, 0xef, 0xc5
};

#define MAXBC 8
#define MAXKC 8
#define MAXROUNDS 14

static word8 shifts[5][4] = {
0, 1, 2, 3,
0, 1, 2, 3,
0, 1, 2, 3,
0, 1, 2, 4,
0, 1, 3, 4
};

static int numrounds[5][5] = {
10, 11, 12, 13, 14,
11, 11, 12, 13, 14,
12, 12, 12, 13, 14,
13, 13, 13, 13, 14,
14, 14, 14, 14, 14
};

int BC, KC, ROUNDS;

word8 mul(word8 a, word8 b) {

if (a && b) {
return Alogtable[(Logtable[a] + Logtable[b])%255];
} else {
return 0;
}
}

void AddRoundKey(word8 a[4][MAXBC], word8 rk[4][MAXBC])
{
int i, j;

for (i=0; i<4; i++) {
for(j=0; j<4; j++) {
a[i][j] ^= rk[i][j];
}
}
}

void SubBytes(word8 a[4][MAXBC], word8 box[256])
{
int i, j;

for (i=0; i<4; i++) {
for(j=0; j< BC; j++) {
a[i][j] = box[a[i][j]];
}
}
}

void ShiftRows(word8 a[4][MAXBC], word8 d)
{

word8 tmp[MAXBC];
int i, j;

if ( d==0) {
for (i=0; i<4; i++) {

for(j=0; j< BC; j++) {
tmp[j] = a[i][(j + shifts[BC-4][i]) % BC];
}

for(j=0; j< BC; j++) {
a[i][j] = tmp[j];
}
}

} else { // for ShiftRows-decryption

for (i=0; i<4; i++) {

for(j=0; j< BC; j++) {
tmp[j] = a[i][(j + 4 - i) % BC];
}

for(j=0; j< BC; j++) {
a[i][j] = tmp[j];
}
}
}
}

void MixColumns(word8 a[4][MAXBC]) {

word8 b[4][MAXBC];
int i, j;

for(j=0; j<BC; j++) {
for(i=0; i<4; i++) {

b[i][j] = mul(2,a[i][j])
^ mul(3,a[(i+1)%4][j])
^ a[(i+2) % 4][j]
^ a[(i+3) % 4][j];
}
}

for(i=0; i<4; i++) {
for(j=0; j< BC; j++) {
a[i][j] = b[i][j];
}
}
}

void InvMixColumns(word8 a[4][MAXBC])
{
word8 b[4][MAXBC];
int i, j;

for(j=0; j<BC; j++) {
for(i=0; i<4; i++) {

b[i][j] = mul(0xe,a[i][j])
^ mul(0xb,a[(i+1) % 4][j])
^ mul(0xd,a[(i+2) % 4][j])
^ mul(0x9,a[(i+3) % 4][j]);
}
}

for(i=0; i<4; i++) {
for(j=0; j< BC; j++) {
a[i][j] = b[i][j];
}
}
}

int KeyExpansion (word8 k[4][MAXKC], word8 W[MAXROUNDS+1][4][MAXBC])
{
int i, j, t, RCpointer = 1;
word8 tk[4][MAXKC];

for(j=0; j< KC; j++) {
for (i=0; i<4; i++) {
tk[i][j] = k[i][j];
}
}

t=0;

for (j=0; (j<KC) && (t<(ROUNDS+1) * BC); j++, t++) {

for ( i=0; i<4; i++) {
W[t / BC][i][t % BC] = tk[i][j];
}
}

while (t < (ROUNDS + 1)*BC) {

for(i=0; i<4; i++) {
tk[i][0] ^= S[tk[(i+1)%4][KC-1]];
}
tk[0][0] ^= RC[RCpointer++];
if (KC <= 6 ) {
for (j=1; j < KC; j++) {
for(i=0; i<4; i++) {
tk[i][j] ^= tk[i][j-1];
}
}

} else {

for (j=1; j < 4; j++) {
for(i=0; i<4; i++) {
tk[i][j] ^= tk[i][j-1];
}
}

for(i=0; i<4; i++) {
tk[i][4] ^= S[tk[i][3]];
}

for (j=5; j < KC; j++) {
for(i=0; i<4; i++) {
tk[i][j] ^= tk[i][j-1];
}
}
}

for (j=0; (j < KC) && (t<(ROUNDS+1)*BC); j++, t++) {
for(i=0; i<4; i++) W[t/BC][i][t%BC] = tk[i][j];
}
}
return 0;
}

int Encrypt (word8 a[4][MAXBC], word8 rk[MAXROUNDS+1][4][MAXBC])
{
int r;

AddRoundKey(a, rk[0]);

for ( r=1; r < ROUNDS; r++) {

SubBytes (a,S);
ShiftRows(a,0);
MixColumns(a);
AddRoundKey(a,rk[r]);
}

SubBytes (a,S);
ShiftRows(a,0);
AddRoundKey(a,rk[ROUNDS]);//round

return 0;
}

int Decrypt (word8 a[4][MAXBC], word8 rk[MAXROUNDS+1][4][MAXBC])
{
int r;

AddRoundKey(a, rk[ROUNDS]);//round
SubBytes(a, Si);
ShiftRows(a,1);

for ( r=ROUNDS-1; r > 0; r--) {

AddRoundKey(a,rk[r]);
InvMixColumns(a);
SubBytes (a,Si);
ShiftRows(a,1);
}

AddRoundKey(a,rk[0]);

return 0;
}

int main()
{

int i, j;
int Nr=0;

word8 a[4][MAXBC], rk[MAXROUNDS+1][4][MAXBC], sk[4][MAXKC];
BC = 4;

while (Nr!=128 && Nr!=192 && Nr!=256) {

printf("Enter the length of Key(128, 192 or 256 only): ");
scanf("%d",&Nr);
}

KC = Nr / 32;

ROUNDS = numrounds[KC-4][BC-4];

cout<<endl;

char key;
ifstream fileKey ("key.txt");
if (fileKey.is_open()) {

for ( j=0; j<KC; j++) {
for ( i=0; i < 4; i++) {

fileKey.get(key);
sk[i][j] = key;
}
}

fileKey.close();
} else {
cout << "Unable to open file";
}

KeyExpansion (sk, rk);

{ // Encrypting the data

char d;
ifstream fileInput ("input.txt");
ofstream fileEncrypted ("encrypted.txt");

fileInput.get(d);

while(!fileInput.eof()) {

for ( j=0; j<BC; j++) {
for ( i=0; i < 4; i++) {

a[i][j] = d;
fileInput.get(d);
}
}

Encrypt(a, rk);

if (fileEncrypted.is_open()) {
for(j=0; j< BC; j ++) {
for ( i=0; i<4; i++) {
fileEncrypted<<a[i][j];
}
}
} else {
cout << "Unable to open file";
}
}

fileEncrypted.close();
fileInput.close();
}

{ // Decrypting the data

char dxc;
ifstream fileEncrypted ("encrypted.txt");
ofstream fileOutput ("output.txt");

fileEncrypted.get(dxc); //priming read

while(!fileEncrypted.eof()) {

for ( j=0; j<BC; j++) {
for ( i=0; i < 4; i++) {

a[i][j] = dxc;
fileEncrypted.get(dxc);
}
}

Decrypt(a, rk);

if (fileOutput.is_open()) {

for(j=0; j<BC; j++) {
for ( i=0; i<4; i++) {
fileOutput<<a[i][j];
}
}

} else {
cout << "Unable to open file";
}
}

cout<<endl;

fileOutput.close();
fileEncrypted.close();
}

return 0;
}

Re: AES Problem

bob1697224-Feb-08 10:17

bob16972

24-Feb-08 10:17

Now why on earth would someone vote someone down for trying to help.

Now, if the implementation the OP provided for the encryption algorithm is wrong, that's out of my hands. They wanted the code to complete the process and it does.

Roll eyes | :rolleyes:

Re: AES Problem

Rajkumar R24-Feb-08 20:54

Rajkumar R

24-Feb-08 20:54

Iam giving you 5 stars for your exceptional patience on reviewing such a long message. but it seems some priority member given you 1 star (total 5 + 1 stars / 2 votes = 1.8) Cry | :((

Re: AES Problem

Maxwell Chen24-Feb-08 21:03

Maxwell Chen

24-Feb-08 21:03

Rajkumar R wrote:
(total 5 + 1 stars / 2 votes = 1.8)

Add my 5 ...
Now 3.2. Big Grin | :-D

Maxwell Chen

Re: AES Problem

Rajkumar R24-Feb-08 21:53

Rajkumar R

24-Feb-08 21:53

that encourages.

Re: AES Problem

BadKarma24-Feb-08 22:19

BadKarma

24-Feb-08 22:19

Added my 5

Were up to 3.77 Smile | :)

codito ergo sum

Re: AES Problem

bob1697225-Feb-08 2:01

bob16972

25-Feb-08 2:01

Call of OnCreate in a CTreeCtrl derived class

madmax000124-Feb-08 2:54

madmax0001

24-Feb-08 2:54

Hello,

I have a problem regarding a CTreeCtrl derived class. I have added a message handler for WM_CREATE:

int CMyTreeCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)

I placed a CTreeCtrl item on the dialog in the resource aditor and afterwards I have change the class from CTreeCtrl to CMyTreeCtrl. This works.
But the problem is, that the OnCreate member function is never called...

What did I miss?

Regards

MM

Re: Call of OnCreate in a CTreeCtrl derived class

prasad_som24-Feb-08 3:10

prasad_som

24-Feb-08 3:10

Have you associated CMyTreeCtrl object with item placed on dialog in editor ?

Prasad
MS MVP - VC++

Re: Call of OnCreate in a CTreeCtrl derived class

madmax000124-Feb-08 3:24

madmax0001

24-Feb-08 3:24

Yes, I have done this in the header file:

<br />
   //{{AFX_DATA(CMyMgrDlg)<br />
   enum { IDD = IDD_MY_MGR_DLG };<br />
   CMyTreeCtrl	m_treeCtrl2;<br />
   //}}AFX_DATA<br />

The object is created and I can call other functions I have added to CMyTreeCtrl.
When I create the object manually without a dialog resource it works:

<br />
   m_treeCtrl2.Create(WS_CHILD|WS_VISIBLE|WS_BORDER|TVS_HASLINES|TVS_LINESATROOT|TVS_HASBUTTONS|TVS_TRACKSELECT|TVS_SHOWSELALWAYS, rect, this, 1234);<br />

But I don't want to create all objects manually, I want to use the resource editor to do this.

Re: Call of OnCreate in a CTreeCtrl derived class

prasad_som24-Feb-08 3:34

prasad_som

24-Feb-08 3:34

When I said "assoicated", it means using DDX_ macro. You need to use dialog data exchange macros to associated dialong control with class variable.

Prasad
MS MVP - VC++

Re: Call of OnCreate in a CTreeCtrl derived class

madmax000124-Feb-08 3:51

madmax0001

24-Feb-08 3:51

Yes, I forgot to mention this. My code looks like this:

<br />
void CMyMgrDlg::DoDataExchange(CDataExchange* pDX)<br />
{<br />
   CDialog::DoDataExchange(pDX);<br />
   //{{AFX_DATA_MAP(CMyMgrDlg)<br />
   DDX_Control(pDX, IDC_CHAIN_TREE, m_treeCtrl2);<br />
   //}}AFX_DATA_MAP<br />
}<br />
<br />

I have edited nothing here. This code was generated automatically.

Regards

Re: Call of OnCreate in a CTreeCtrl derived class

Mark Salsbery24-Feb-08 9:00

Mark Salsbery

24-Feb-08 9:00

This isn't going to work.

The control in a dialog resource template is created before you get a chance
to catch the WM_CREATE for the control, which ends up going to the default window
procedure for the control class.

DDX isn't going to help either, since the first DDX operation done is subclassing the control,
which is done way after the control is created.

You have two options AFAIK -

1) Create a custom window class which wraps the windows control window class. This class needs
to be registered with Windows. The control on the dialog resource needs to be this type/class.
Then your window proc will get called for the control before you pass messages on to the control's
window proc. This would be window superclassing.

2) Create the control at runtime instead of letting Windows create it from the dialog template.

Note that whatever you need to do in this WM_CREATE handler, you may be able to do in the
dialog class' OnInitDialog(), which is easier than either of the options above.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Call of OnCreate in a CTreeCtrl derived class

madmax000124-Feb-08 9:25

madmax0001

24-Feb-08 9:25

Hello Mark,

thank you very much for your help. I have now changed my class and now I do my initialization by calling a special function in my OnInitDialog.

Regards

Re: Call of OnCreate in a CTreeCtrl derived class

Julberto Danray24-Feb-08 14:59

Julberto Danray

24-Feb-08 14:59

madmax0001,

There is yet a third option for you. You can override the virtual function PreSubclassWindow() in your CTreeCtrl-derived class. You can do you initialization there.

Julberto

Re: Call of OnCreate in a CTreeCtrl derived class

Mark Salsbery24-Feb-08 20:49

Mark Salsbery

24-Feb-08 20:49

Julberto Danray wrote:
PreSubclassWindow

That's cool if it works, but how does the the CWnd object get associated with the control before it is created?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Call of OnCreate in a CTreeCtrl derived class

Julberto Danray25-Feb-08 4:19

Julberto Danray

25-Feb-08 4:19

I'm assuming the the control is being subclassed via SubclassDlgItem() or DDX_Control(). In either case PreSubClassWindow() will be called.

This is a very convenient way to initialize your subclassed controls because it does not require any special treatment from the dialog that contains the control.

Julberto

Re: Call of OnCreate in a CTreeCtrl derived class

Mark Salsbery25-Feb-08 5:40

Mark Salsbery

25-Feb-08 5:40

Right, but the OP is trying to catch WM_CREATE, which has occurred long before the first
DDX_Control() call.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

FTP Monitor

Golden Lee24-Feb-08 0:10

Golden Lee

24-Feb-08 0:10

Dear Sir:
I want to monitor a remote directory hosted on an FTP server to check up whether there are some newer files (compared with my local downloads) or not. If any, new files will be downloaded automatically.

I understand in the rough how to do that. Firstly, start a timer and periodically examine certain FTP remote folder through the use of CFtpFileFind member functions to check up whether there are some newer files (compared with my local downloads, but keeping a download timestamp may be a good idea) or not. But in case that the file is not completly written to the remote FTP folder, and at the same time my FTP monitor thread is going to be activated to do its checking job. How can I cope with this kind of "race condition" as ideal as possible?

BTW, any recommendations to the source codes concerned either free or commercially available are highly appreciated. Any suggestions are heartily welcome!

Thank you!

Re: FTP Monitor

Ed.Poore24-Feb-08 7:21

Ed.Poore

24-Feb-08 7:21

Firstly if there's another way other than polling the server I suggest you take it, kinder to the server.

With regards to your problem, why don't you check back (the next day or something) once a new file has been "discovered" and compare sizes, if the two are the same then you can download the file, if not wait another day and compare again to see if it's not growing anymore.

Re: FTP Monitor

Golden Lee24-Feb-08 15:31

Golden Lee

24-Feb-08 15:31

Dear Poore:
Thank you for your kind advice. I know polling the FTP server is not a good idea. My system must frequently check up the FTP server because some new data files will be put on the FTP server every 15 or 30 minutes. User can't wait any longer (not say wait until next day) because the successive production task will be carried out as earlier as possible. Our system is a time critical system.

Any suggestions? Could you kindly recommend any commercial or open source codes for me? Thank you again!

Re: FTP Monitor

Ed.Poore24-Feb-08 22:46

Ed.Poore

24-Feb-08 22:46

Golden Lee wrote:
User can't wait any longer (not say wait until next day)

I just used the example of a day to keep from polling the servers too frequently. You could check the next time you poll, i.e. 15 minutes later. That way at worst it'll start 14 minutes late. Or you could set up something so that if and only if there's a new file detected then check only that file in a minutes time (depending on how fast you think files will be uploaded).

Golden Lee wrote:
Could you kindly recommend any commercial or open source codes for me?

Sorry I don't know of anything

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Re: FTP Monitor

David Crow24-Feb-08 13:20

David Crow

24-Feb-08 13:20

Golden Lee wrote:
I want to monitor a remote directory hosted on an FTP server to check up whether there are some newer files (compared with my local downloads) or not.

Have you considered ReadDirectoryChangesW() or FindFirstChangeNotification()?

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Re: FTP Monitor

Golden Lee24-Feb-08 15:15

Golden Lee

24-Feb-08 15:15

Thank you for your suggestion. ReadDirectoryChangesW() or FindFirstChangeNotification function is usually used for watching local or UNC folder (\\computername\driveletter:\folder), not suitable for monitoring the remote folder on an FTP host running under Windows, Linux, Unix or other operating systems.

Thank you anyway!

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