C / C++ / MFC

Re: How To Pass Value From One Dialog To Another

15-May-07 1:58

Keep the text in a string variable [inside the child dialog]. Then inside the main dialog, get the string value when the child is closed. It might be smth like this;

// inside the main dialog calling function
CMySecondDlg dlg;
if (dlg.DoModal() == IDOK)
{
   CString text = dlg.m_strText;
}

If your second dialog is modeless, you should get the main dialog handler (GetParent or pass it directly) and do PostMessage inside the child dialog.

--
=====
Arman

JimmyRopes15-May-07 3:59

JimmyRopes

15-May-07 3:59

Use a memory mapped file.

Simply Elegant Designs JimmyRopes Designs
Think inside the box! ProActive Secure Systems

I'm on-line therefore I am.
JimmyRopes

function pointers

Sonia Gupta15-May-07 1:17

Sonia Gupta

15-May-07 1:17

What are function pointers?
i have heard about the chat *ptr.
But what is function pointer.
i read it in the vb.net article based on the delegates.
the line that article included is

"A delegate is a reference type that refers to a Shared method of a type or to an instance method of an object. The closest equivalent of a delegate in other languages is a function pointer, but whereas a function pointer can only reference Shared functions, a delegate can reference both Shared and instance methods."

Re: function pointers

Hamid_RT15-May-07 1:25

Exception code: c0000090 (FLT_INVALID_OPERATION) - I am in despair!

15-May-07 1:25

Maybe you want to see Function pointer[^] and The Function Pointer Tutorials[^]

WhiteSky

Re: function pointers

CPallini15-May-07 1:37

CPallini

15-May-07 1:37

I give you an example:

int mySqr(int i){ return i*i;}
int myAbs(int i){ return i < 0 ? -i : i;}

int main(int argc, char* argv[])
{

  int (*pFun)(int);	
  int i=-5;

  pFun = mySqr;
  printf( "pFun=mySqr\n");
  printf( "pFun(%d)=%d\n", i, pFun(i));
  pFun = myAbs;
  printf( "pFun=myAbs\n");
  printf( "pFun(%d)=%d\n", i, pFun(i));
  getchar();
  return 0;
}

in the code above, pFun is a function pointer, i.e. a variable that can hold the address of a function, allowing to make calls to different functions dynamically.

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Best Kiluyar15-May-07 0:25

Best Kiluyar

15-May-07 0:25

I'm working on a fatal error which make our application crash! I can not reproduce it in my environment, so I tried to get the Dr.Watson's dump log and it indicate such error:

380861d0 da742430 fidiv dword ptr [esp+0x30] ss:00c0977f=a0b900c1
FAULT ->380861d4 d95e58 fstp dword ptr [esi+0x58] ds:00c0983a=c1eed825

I have found the code corresponding to the asm instruction:

i = float (m_rect.Width()) / float(m_rect.Height());

Just two floats' division! Dead | X|

I'm sure denominator is not Zero! I can not understand why the fstp give such a fatal message:

Exception code: c0000090 (FLT_INVALID_OPERATION)

Who can give me advices? Thanks a lot, a lot...

Re: Exception code: c0000090 (FLT_INVALID_OPERATION) - I am in despair!

Arman S.15-May-07 2:09

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

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

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

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