C / C++ / MFC

15-May-07 2:09

Are you using VC7.1 or VC8 release canditate. As far as I remember, this is a bug on those IDEs.

--
=====
Arman

Any File Encryption

Genius Am Not15-May-07 0:21

15-May-07 0:21

Im tryin to write a VC++ application to encrypt any file the user selects.
I have done it for a binary file. But have no idea about how to do it if its a video or picture file.
What do i do? D'Oh! | :doh:

Jesus Loves Us Just the way we are! Invite Him into your life today!

Arman S.15-May-07 0:25

15-May-07 0:25

No difference. Those files are binary too.

--
=====
Arman

Genius Am Not15-May-07 0:35

15-May-07 0:35

But then wat about loading the contents of the file to encrypt and stuff...
do i do it the same way??
cuz i tried using the same method and the encrypted stuff is not the same as the source... Frown | :(

Jesus Loves Us Just the way we are! Invite Him into your life today!

Arman S.15-May-07 1:09

15-May-07 1:09

Then what's the purpose of your encryption? What encryption method are you using?

--
=====
Arman

Genius Am Not15-May-07 1:17

15-May-07 1:17

This is the code snippet for the original binary file encryption program.
I just need to convert this so that it can accept any file. Im using the RIjnael class for the encryption and decryption.
The purpose is to encrypt and decrypt any file using the same key.

<br />
void CFileEnDecryptionDlg::Char2Hex(const unsigned char ch, char *szHex)<br />
{<br />
	unsigned char byte[2];<br />
	byte[0] = ch/16;<br />
	byte[1] = ch%16;<br />
	for(int i=0; i<2; i++)<br />
	{<br />
		if(byte[i] >= 0 && byte[i] <= 9)<br />
			szHex[i] = '0' + byte[i];<br />
		else<br />
			szHex[i] = 'A' + byte[i] - 10;<br />
	}<br />
	szHex[2] = 0;<br />
}<br />
<br />
void CFileEnDecryptionDlg::Hex2Char(const char *szHex, unsigned char &rch)<br />
{<br />
	rch = 0;<br />
	for(int i=0; i<2; i++)<br />
	{<br />
		if(*(szHex + i) >='0' && *(szHex + i) <= '9')<br />
			rch = (rch << 4) + (*(szHex + i) - '0');<br />
		else if(*(szHex + i) >='A' && *(szHex + i) <= 'F')<br />
			rch = (rch << 4) + (*(szHex + i) - 'A' + 10);<br />
		else<br />
			break;<br />
	}<br />
}<br />
<br />
<br />
<br />
void CFileEnDecryptionDlg::CharStr2HexStr(const char *pucCharStr, char *pszHexStr, int iSize)<br />
{<br />
	int i;<br />
	char szHex[3];<br />
	pszHexStr[0] = 0;<br />
	for(i=0; i<iSize; i++)<br />
	{<br />
		Char2Hex(pucCharStr[i], szHex);<br />
		strcat(pszHexStr, szHex);<br />
	}<br />
}<br />
<br />
void CFileEnDecryptionDlg::HexStr2CharStr(const char *pszHexStr, char *pucCharStr, int iSize)<br />
{<br />
	int i;<br />
	unsigned char ch;<br />
	for(i=0; i<iSize; i++)<br />
	{<br />
		Hex2Char(pszHexStr+2*i, ch);<br />
		pucCharStr[i] = ch;<br />
	}<br />
}<br />
<br />
void CFileEnDecryptionDlg::OnEncryptBtn() <br />
{<br />
	<br />
	h = 0;<br />
<br />
tag:<br />
<br />
	CWnd *input, *output, *result; <br />
	CWnd *msgbox;<br />
	CString  key,text, message;<br />
	char buf[300],hex[600]; <br />
		<br />
	memset(buf,0,300);<br />
	memset(hex,0,600);<br />
<br />
<br />
	// Get the pointers<br />
	input = GetDlgItem(IDC_SOURCE_FILE_CONTENTS);<br />
	output = GetDlgItem(IDC_KEY);<br />
	msgbox = GetDlgItem(IDC_MSGBOX);<br />
	result = GetDlgItem(IDC_RESULT);<br />
	<br />
	result->SetWindowText("");<br />
	<br />
	// Get the window Text<br />
	output->GetWindowText(key);<br />
	input->GetWindowText(text);<br />
<br />
	int flag = 0;<br />
	if(key.GetLength()==0)<br />
	{<br />
		output->SetWindowText("1234567890123456");<br />
		msgbox->SetWindowText("Default Value of key used");<br />
		<br />
	}<br />
<br />
	if(text.GetLength() == 0){<br />
		input->SetWindowText("Scolis Technologies Pvt. Ltd.");<br />
	<br />
		output->GetWindowText(key);<br />
      	input->GetWindowText(text);<br />
		flag = 1;<br />
	}<br />
<br />
	<br />
<br />
	// Initilalize the object<br />
	rijndael.MakeKey ((LPCTSTR)key);<br />
<br />
	int length = text.GetLength();<br />
<br />
	<br />
	if((text.GetLength() % 16) != 0)<br />
	{<br />
		<br />
		// pad up the text<br />
		while((text.GetLength() % 16) != 0)<br />
		{<br />
			text.Insert(length,'0');<br />
			length++;<br />
		}<br />
		if (flag == 0)<br />
			msgbox->SetWindowText("Zeroes have been padded to make the length of string divisible by 16 ");<br />
		else<br />
			<br />
			msgbox->SetWindowText("I'm taking default values since you provided none. Note: Zeroes have been padded to make the length of string divisible by 16");<br />
	}	<br />
<br />
	// Encrypt the string<br />
	rijndael.Encrypt((LPCTSTR)text, buf, text.GetLength());<br />
<br />
	// convert to hex and display<br />
	CharStr2HexStr(buf, hex, strlen(buf));<br />
	result->SetWindowText(hex);<br />
<br />
	if (h == 0)<br />
	{ <br />
		h=1; <br />
		goto tag;<br />
	}<br />
<br />
	<br />
	CFile OFile;<br />
	OFile.Open(m_DestinationFileName, CFile::modeWrite | CFile :: modeCreate);<br />
<br />
	CArchive ar(&OFile, CArchive::store);<br />
	ar << (CString)hex;<br />
	ar.Close();<br />
<br />
	memset(buf,0,300);<br />
	memset(hex,0,600);<br />
<br />
<br />
	OFile.Close();<br />
	msgbox -> SetWindowText("Encrypted Content has been Written to file!");<br />
	<br />
}<br />
<br />
void CFileEnDecryptionDlg::OnDecryptBtn() <br />
{<br />
	CWnd *key,*cipher,*result, *msgbox;<br />
	CString key_text, cipher_text;<br />
	char buf[300],buf1[300];<br />
	<br />
	key_text = '\0';<br />
	cipher_text = '\0';<br />
	key = NULL;<br />
<br />
	memset(buf,0,300);<br />
	memset(buf1,0,300);<br />
<br />
<br />
<br />
	// Get the pointers<br />
	key = GetDlgItem(IDC_KEY);<br />
	cipher = GetDlgItem(IDC_SOURCE_FILE_CONTENTS);<br />
	result= GetDlgItem(IDC_RESULT);<br />
	msgbox = GetDlgItem(IDC_MSGBOX);<br />
	<br />
	//plain->SetWindowText("");<br />
<br />
	// read the key and cipher text<br />
	key->GetWindowText(key_text);<br />
	cipher->GetWindowText(cipher_text);<br />
	<br />
	if( cipher_text.GetLength()==0){<br />
		cipher->SetWindowText("C9377FD2C4D57AA3BD84B247EF0995264CB4378A4E0EA21DA98B7016F64B121C");<br />
		cipher->GetWindowText(cipher_text);<br />
	}<br />
<br />
<br />
	if(key_text.GetLength() == 0 ){<br />
		msgbox->SetWindowText("Ciphertext or Key, decrypting using default values");<br />
		key->SetWindowText("1234567890123456");<br />
		key->GetWindowText(key_text);<br />
		<br />
	}<br />
<br />
    <br />
	<br />
	rijndael.MakeKey ((LPCTSTR)key_text);<br />
<br />
	// decrypt them<br />
	HexStr2CharStr((LPCTSTR)cipher_text, buf1, cipher_text.GetLength ());<br />
<br />
	rijndael.Decrypt((LPCTSTR)buf1, buf, strlen(buf1));<br />
<br />
	//convert and display<br />
	result->SetWindowText(buf);<br />
		<br />
	CFile OFile;<br />
	OFile.Open(m_DestinationFileName, CFile::modeWrite | CFile :: modeCreate);<br />
<br />
	CArchive ar(&OFile, CArchive::store);<br />
	ar << (CString)buf;<br />
	ar.Close();<br />
<br />
	memset(buf,0,300);<br />
	memset(buf1,0,300);<br />
<br />
	OFile.Close();<br />
	msgbox -> SetWindowText("Decrypted Content has been Written to file!");<br />
<br />
}<br />
<br />
void CFileEnDecryptionDlg::OnDefaultBtn() <br />
{<br />
	m_SourceFileContents="Scolis Technologies Pvt. Ltd.";<br />
<br />
	m_Key= "1234567890123456";<br />
	CWnd *result, *msgbox;<br />
<br />
	result= GetDlgItem(IDC_RESULT);<br />
	msgbox = GetDlgItem(IDC_MSGBOX);<br />
<br />
	result->SetWindowText("");<br />
	<br />
	UpdateData(FALSE);<br />
	msgbox->SetWindowText("Default Contents Entered");<br />
<br />
}<br />
<br />
void CFileEnDecryptionDlg::OnInBrowse() <br />
{<br />
	CFile TextFile;<br />
<br />
	char strFilter[]={ "Binary Files (*.bin)|*.bin||" };<br />
<br />
	CFileDialog FileDlg( TRUE, "*.bin", NULL, 0, strFilter);// Opening browse dialog box<br />
<br />
	if( FileDlg.DoModal() == IDOK)<br />
	{<br />
		if( TextFile.Open(FileDlg.GetFileName(), CFile::modeRead) == FALSE )<br />
		{<br />
			return;<br />
		}<br />
<br />
		CArchive ar( &TextFile, CArchive::load); // Loads the contents of the file<br />
		ar >> m_SourceFileContents; // Diplays the contents of the file<br />
		ar.Close();<br />
	}<br />
	else<br />
	{<br />
		return;<br />
	}<br />
<br />
	TextFile.Close();<br />
<br />
	this -> UpdateData(FALSE);<br />
	<br />
		<br />
}<br />
<br />
void CFileEnDecryptionDlg::OnOutBrowse() <br />
{<br />
	CWnd *name;<br />
<br />
	name = GetDlgItem(IDC_DESTINATION_FILE_NAME);<br />
<br />
	CFile TextFile;<br />
<br />
	char strFilter[]={ "Binary Files (*.bin)|*.bin||" };<br />
<br />
	CFileDialog FileDlg( TRUE, "*.bin", NULL, 0, strFilter);// Opening browse dialog box<br />
<br />
	if( FileDlg.DoModal() == IDOK)<br />
	{<br />
		if( TextFile.Open(FileDlg.GetFileName(), CFile::modeWrite | CFile::modeCreate) == FALSE )<br />
		{<br />
			return;<br />
		}<br />
		m_DestinationFileName = FileDlg.GetPathName();<br />
				<br />
	}<br />
	else<br />
	{<br />
		return;<br />
	}<br />
<br />
	TextFile.Close();<br />
<br />
	this -> UpdateData(FALSE);<br />
	<br />
}<br />
<br />
void CFileEnDecryptionDlg::OnCancel() <br />
{<br />
	exit(0);<br />
	<br />
	CDialog::OnCancel();<br />
}

Jesus Loves Us Just the way we are! Invite Him into your life today!

Arman S.15-May-07 2:20

15-May-07 2:20

Ok, if your purpose is solely encrypt/decrypt, then this code will do. Only do open the file in binary mode, read bytes from there and pass them to your enryption algorythm. If after encryption and a corresponding decryption you cannot get what you had before, than your algorythms are wrong; no matter you have used video, image or other types of files.

--
=====
Arman

Genius Am Not20-May-07 22:52

Track other processes in the computer

20-May-07 22:52

hey thanks duude
it worked

Jesus Loves Us Just the way we are! Invite Him into your life today!

kamalesh8214-May-07 23:58

kamalesh82

14-May-07 23:58

Hi All,

Currently I'm developing a tool, for that purpose i have to know all other processes running on the computer and achieve the handle of specified process.There are some functions in VB and but i need to write in MFC only... How can get it?

bye
kamalesh

kamalesh

Re: Track other processes in the computer [modified]

Arman S.15-May-07 0:10

15-May-07 0:10

See the APIs Process32First, Process32Next from include header <tlhelp32.h>

--
=====
Arman

AkiraOne15-May-07 0:15

AkiraOne

15-May-07 0:15

See http://msdn2.microsoft.com/en-us/library/ms682629.aspx[^]is helpfuls?

Too many plans make the health badly!!

Hamid_RT15-May-07 0:58

Hamid_RT

15-May-07 0:58

Does EnumProcesses helpful?

WhiteSky

kasturi_haribabu15-May-07 1:08

kasturi_haribabu

15-May-07 1:08

Pls Find answer to your code....
I dont know how i can attach a file to code project message. there fore please copy from the message...

/* Header File for the Class /*

#include "stdafx.h"
#include "psapi.h"
#pragma pack(16)

#define FOUND_WJRU 0
#define WJRU_NOTFOUND 1

class CProcessMonitor
{
private:
DWORD mAvailableProcesses[1024], cbNeeded, cProcesses;
public:
UINT getTotalAvailableProcesses();
UINT getProcessTimes();
BOOL FindProcessandMemoryDetails(DWORD processID,CString Processname,PROCESS_MEMORY_COUNTERS& psmemCounters);
BOOL IsProcessMatchingNameAndID( DWORD processID, UINT index );
HANDLE GetProcessHandle(DWORD processID, CString Processname);
HANDLE GetHandleToProcess(CString Processname);
void GetJRUStatus(int&nStatus, PROCESS_MEMORY_COUNTERS& psMemInfo);

};

#pragma pack()

/// CPLUSS PLUS FILE....

#include "stdafx.h"
#include "psapi.h"
#include "EnumProcess.h"

BOOL CProcessMonitor::IsProcessMatchingNameAndID( DWORD processID, UINT index )
{
char szProcessName[MAX_PATH] = "unknown";
char szTargetProcessName[MAX_PATH] = "Wjru.exe";

PROCESS_MEMORY_COUNTERS psmemCounters;

// Get a handle to the process.
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );

// Get the process name.
if ( hProcess )
{
HMODULE hMod;
DWORD cbNeeded;

if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
&cbNeeded) )
{
GetModuleBaseName( hProcess, hMod, szProcessName,
sizeof(szProcessName) );

if(strcmp(szProcessName,szTargetProcessName) ==0)
{

GetProcessMemoryInfo(hProcess,&psmemCounters,sizeof(PROCESS_MEMORY_COUNTERS));

return TRUE;
}
else
{
return FALSE;
}
}
}
return FALSE;
}

BOOL CProcessMonitor::FindProcessandMemoryDetails(DWORD processID, CString Processname,PROCESS_MEMORY_COUNTERS& psmemCounters)
{

char szProcessName[MAX_PATH] = "unknown";
char szTargetProcessName[MAX_PATH];

strcpy(szTargetProcessName,Processname.GetBuffer(50));
Processname.ReleaseBuffer();

// Get a handle to the process.
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );

// Get the process name.
if ( hProcess )
{
HMODULE hMod;
DWORD cbNeeded;

if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
&cbNeeded) )
{
GetModuleBaseName( hProcess, hMod, szProcessName,
sizeof(szProcessName) );

if(strcmp(szProcessName,szTargetProcessName) ==0)
{

GetProcessMemoryInfo(hProcess,&psmemCounters,sizeof(PROCESS_MEMORY_COUNTERS));
return TRUE;
}
else
{
return FALSE;
}
}
}
return FALSE;
}

void CProcessMonitor::GetJRUStatus(int& nStatus, PROCESS_MEMORY_COUNTERS& psMemInfo)
{

ULONG lCpuusage = 0;
UINT index;
//Find Total Number of Processes;
if (!EnumProcesses( mAvailableProcesses, sizeof(mAvailableProcesses), &cbNeeded ) )
return;
// Calculate how many process identifiers were returned.
cProcesses = cbNeeded / sizeof(DWORD);
if(cProcesses > 1000)
{
AfxMessageBox("There are Too Many applications Running on PC.");
}

PROCESS_MEMORY_COUNTERS psTempMemInfo;

for ( index = 0; index < cProcesses; index++ )
{
if(FindProcessandMemoryDetails(mAvailableProcesses[index],"Wjru.exe",psTempMemInfo)== TRUE)
{
nStatus = FOUND_WJRU;
psMemInfo = psTempMemInfo;
return;
}
}

nStatus = WJRU_NOTFOUND;

}

HANDLE CProcessMonitor::GetProcessHandle(DWORD processID, CString Processname)
{

char szProcessName[MAX_PATH] = "unknown";
char szTargetProcessName[MAX_PATH];

strcpy(szTargetProcessName,Processname.GetBuffer(50));
Processname.ReleaseBuffer();
// Get a handle to the process.
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );

// Get the process name.
if ( hProcess )
{
HMODULE hMod;
DWORD cbNeeded;

if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
&cbNeeded) )
{
GetModuleBaseName( hProcess, hMod, szProcessName,
sizeof(szProcessName) );

if(strcmp(szProcessName,szTargetProcessName) ==0)
{
return hProcess;
}
else
{
return NULL;
}
}
}

return NULL;
}

HANDLE CProcessMonitor::GetHandleToProcess(CString ProcessName)
{
HANDLE hProcess;
hProcess = NULL;

char szProcessName[MAX_PATH] = "unknown";
char szTargetProcessName[MAX_PATH];

strcpy(szTargetProcessName,ProcessName.GetBuffer(50));
ProcessName.ReleaseBuffer();

ULONG lCpuusage = 0;
UINT index;

//Find Total Number of Processes;
if (!EnumProcesses( mAvailableProcesses, sizeof(mAvailableProcesses), &cbNeeded ) )
return hProcess;

// Calculate how many process identifiers were returned.
cProcesses = cbNeeded / sizeof(DWORD);

if(cProcesses > 1000)
{
AfxMessageBox("There are Too Many applications Running on PC.");
}

for ( index = 0; index < cProcesses; index++ )
{
hProcess= GetProcessHandle(mAvailableProcesses[index],szTargetProcessName);
if(hProcess != NULL)
{
return hProcess;
}
}
return hProcess;
}

Haribabu....

Hamid_RT15-May-07 1:18

Hamid_RT

15-May-07 1:18

kasturi_haribabu wrote:
I dont know how i can attach a file to code project message

Not yet,but you can use of pre when post a code.;)

WhiteSky

Problem with constructor overloading...

kamalesh8215-May-07 1:20

kamalesh82

15-May-07 1:20

Thanks for this nice and beutiful code. Thanks to all....All are helpfuls. Thanks again.

kamalesh

changing row colour

neha.agarwal2714-May-07 23:53

neha.agarwal27

14-May-07 23:53

Hi all,

I have made a list control which is of report style, what i want is when a particular condition is met the whole row colour should change to red. and if more than 1 row satisfy that condition all row's colour should change to red.

can anybody help me in this

thanks in advance

Re: changing row colour

Hamid_RT15-May-07 0:45

Hamid_RT

15-May-07 0:45

See XListCtrl - A custom-draw list control with subitem formatting[^]

WhiteSky

Re: changing row colour

Nelek15-May-07 0:48

Nelek

15-May-07 0:48

Hi,

Try here[^] and/or here[^]

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

sandeepkavade14-May-07 23:46

sandeepkavade

14-May-07 23:46

hi all,
i am having a class and i want to impliment 2 overloaded constructors as:
in .h file:
Document(const char* filename=NULL);
Document(const wchar_t* filename=NULL);

in .cpp file

Document::Document( const char* filespec )
{
m_pdoc = NULL;
load( filespec );
}

Document::Document( const wchar_t* filespec )
{
m_pdoc = NULL;
load( filespec );
}

the load function is also overloaded.

but it gives me warning saying:
warning C4520: 'Document' : multiple default constructors specified

and error saying:

error C2668: 'Document::Document' : ambiguous call to overloaded function

where i am going wrong?

Cedric Moonen14-May-07 23:54

Cedric Moonen

14-May-07 23:54

Guess what happen if you don't pass anything to your constructor ? How will your compiler be able to select one of the two constructor ?

Remove the default parameter so that the compiler isn't confused in the case where you don't pass any argument.

Cédric Moonen
Software developer

Charting control [v1.2]

sandeepkavade14-May-07 23:57

sandeepkavade

14-May-07 23:57

thanx a lot!

Arman S.15-May-07 0:00

15-May-07 0:00

in .h file:
Document(const char* filename=NULL);
Document(const wchar_t* filename=NULL);

The reason is here. You specified two default ctors because both of them are supposed to be called when no arhuments are passed to a ctor. So remove the default parameter value (=NULL) from one of ctors [or both of them].

--
=====
Arman