Thread Event Objects - C / C++ / MFC Discussion Boards

adichavan31-Jul-09 0:42

31-Jul-09 0:42

plzzzzzzzzz help me i read 256 bitmap image in the form of array & i display it but while displaying it not shows its actuall colors .It means it shows blue color at the place of red & white color at the place of yellow & so on I set the VGA graphics mode & use putpixel() & setcolor() graphics functions i want to use this functions onli cause it gives other information coractlly so plzzz tell me how can i display it?

Re: display 256 color bitmap image

Adam Roderick J31-Jul-09 0:45

Adam Roderick J

31-Jul-09 0:45

please read below one
http://www.cs.colorado.edu/~main/bgi/doc/initgraph.html[^]

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Re: display 256 color bitmap image

adichavan31-Jul-09 0:56

adichavan

31-Jul-09 0:56

hiiiiiiiiii thanx for sending me code but actualy i use the same methode only initialising graphics mode
EGA which supports 16 colors but i want to put 256 colors plz help for this code i want to display image which I read from hard disk right now my sample image is of tiger which gives correct shape & size it puts colors also but with wrong colors like white insted of yellow etc........

Re: display 256 color bitmap image [modified]

Adam Roderick J31-Jul-09 1:03

Adam Roderick J

31-Jul-09 1:03

do u wnat to load bitmap from a file?
if so please check

http://www.brackeen.com/vga/bitmaps.html[^]

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modified on Friday, July 31, 2009 7:13 AM

Re: display 256 color bitmap image

adichavan31-Jul-09 1:21

adichavan

31-Jul-09 1:21

no i had allready load the image put it in array form also now i want to show it on output window .See i read the image file using fopen ,fread functioss also read its header & i can display it on the o/p successfully but the color information is wrong it shows wrong shades of color so i can understand now which graphics mode or function shall i use to put proper colors in image only color shades of my image are wrong like background in original image is red & in my o/p image it is blue also tiger color it shows gray & white likewise.

Re: display 256 color bitmap image

Adam Roderick J31-Jul-09 1:45

Adam Roderick J

31-Jul-09 1:45

refer this
http://www.brackeen.com/vga/bitmaps.html[^]

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Re: display 256 color bitmap image

adichavan31-Jul-09 19:40

adichavan

31-Jul-09 19:40

thanx man but i have to use only graphics mode this code is run only on vga i am using graphics .h header & i can show my image properly only the problem is that it not shows colors perfectly i allready mention like it shows blue color in the portion of red color & so on its i use ega mode or vga mode & putpixel()
function to put the proper color pixels i had allready studied this all codes & now my program is working properly only color problem thats all byeeeeeeeeee............ Smile | :)

Thread Event Objects

susanne131-Jul-09 0:25

susanne1

31-Jul-09 0:25

Hallo i have the following problem:

i need to start and end a thread by using Event Objects in MFC, following is the code in the ThreadView.cpp:

Event m_threadStart;

Event m_threadEnd;

ON_MESSAGE(WM_CREATE, OnCreate) // causes a casting problem

void CThreadView::OnStartThread()
{
m_threadStart.SetEvent ();
}

void CThreadView::OnStopThread()
{
m_threadEnd.SetEvent ();
}

int CThreadView::OnCreate(LPCREATESTRUCT lpCreateStruct) // defined in ThreadView.h liks this: afx_msg OnCreate(LPCREATESTRUCT lpCreateStruct)
{
HWND hWnd = GetSafeHwnd();

AfxBeginThread(ThreadProc, hWnd, THREAD_PRIORITY_NORMAL);

return 0;
}

LONG CThreadView::OnThreadended(WPARAM wParam, LPARAM lParam)
{
CString strThreadEnd = _T("Thread ended.");

AfxMessageBox(strThreadEnd, 0,0);

return 0;
}

UINT ThreadProc(LPVOID param)
{
CString strThread_Start = _T("Thread aktiviert.");
CString strThread_Stop = _T("Thread deaktiviert.");
CString strThread_Caption = _T("Thread");

::WaitForSingleObject(m_threadStart.m_hObject , INFINITE);

::MessageBox((HWND)param, strThread_Start, strThread_Caption, MB_OK);

bool bKeepRunning = true;

while(bKeepRunning)
{
int nResult = ::WaitForSingleObject (m_threadStart.m_hObject ,0);

if(nResult == WAIT_OBJECT_0)
bKeepRunning = false;
}

::PostMessage((HWND)param, WM_THREADENDED, 0, 0);

return 0;
}

First the Compiler bring an error c2440: ON_MESSAGE(WM_CREATE, OnCreate) // causes a casting problem
I can not cast.

Something is terribly wrong with this code , please help.

Re: Thread Event Objects

«_Superman_»31-Jul-09 0:56

«_Superman_»

31-Jul-09 0:56

For custom messages that are mapped using ON_MESSAGE the handler must have a signature that returns an LRESULT and takes 2 parameter of WPARAM and LPARAM.

So your OnCreate function must look like this -
LRESULT CThreadView::OnCreate(WPARAM wParam, LPARAM lParam);

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Thread Event Objects

Garth J Lancaster31-Jul-09 1:02

Garth J Lancaster

31-Jul-09 1:02

have a look at this

http://msdn.microsoft.com/en-us/library/k35k2bfs(VS.80).aspx[^]

look carefully at "The type of the function must be afx_msg LRESULT (CWnd::*)(WPARAM, LPARAM).", their example

// implementation for WM_MYMESSAGE handler
LRESULT CMyWnd::OnMyMessage( WPARAM wParam, LPARAM lParam ) 
{
   // ... Handle message here
   return 0L;
}

vs yours ..

int CThreadView::OnCreate(LPCREATESTRUCT lpCreateStruct)

interestingly, your "OnThreadended" ie

LONG CThreadView::OnThreadended(WPARAM wParam, LPARAM lParam) 
{
CString strThreadEnd = _T("Thread ended.");

AfxMessageBox(strThreadEnd, 0,0);

return 0;
}

appears ok

Re: Thread Event Objects

susanne131-Jul-09 2:22

susanne1

31-Jul-09 2:22

Thanks for your help.

Can you tell me please how can call or access a global variable or a function defined in th Doc.cpp or anyaother class from inside UINT ThreadProc (LPVOID param)?

UINT ThreadProc(LPVOID param)
{
CTestDoc* pDoc = GetDocument(); // error: GetDocument() is not defined???
ASSERT_VALID(pDoc);

::WaitForSingleObject(m_Thread_Sel_Start.m_hObject , INFINITE);

::MessageBox((HWND)param, strThread_Start, strThread_Caption, MB_OK);

CSQLCommand::FindSQLCmd(pDoc,m_strSelect);// error :m_strSelect is defined in the CTestView.h but he can not find it , pDoc is already unkown

bool bKeepRunning = true;

while(bKeepRunning)
{
int nResult = ::WaitForSingleObject (m_Thread_Sel_End.m_hObject ,0);

if(nResult == WAIT_OBJECT_0)
bKeepRunning = false;
}

::PostMessage((HWND)param, WM_THREADENDED, 0, 0);

return 0;
}

Can i define the UINT ThreadProc(LPVOID param) in the CTestDoc.cpp?
And why when i declare UINT ThreadProc(LPVOID param) in the CTestView.h i get this error:
error C3867: "CTestView::ThreadProc": use "&CTestView::ThreadProc".

and when i use &CTestView::ThreadProc i get a csting problem that can not be solved through an explict cast.

match the character of a string

vikas choudhry31-Jul-09 0:04

vikas choudhry

31-Jul-09 0:04

hii all

its a C Programme.
i need to check characters in a string(character pointer)so that i can diffrenciate my strings for alphabatic character and numeric character.
there are scenerios where i have to invalidate string containing even a single alphabatic character.
and in other scenarios i have to invalidate those strings which contain even a single numeric character.

i am new in this C field so please provide me code to implement it.

Re: match the character of a string

_AnsHUMAN_ 31-Jul-09 0:20

_AnsHUMAN_

31-Jul-09 0:20

Looks like an assignment.
May I politely ask you to read about if-else statement[and other conditional statements] and also the loops

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: match the character of a string

vikas choudhry31-Jul-09 0:26

vikas choudhry

31-Jul-09 0:26

buddy i have red all these things..now can someone plz provide me solution

Re: match the character of a string

Chandrasekharan P31-Jul-09 0:30

Chandrasekharan P

31-Jul-09 0:30

Vikas, if you have read all those things you should be able to solve the problem. Nobody here writes programs for you.

Re: match the character of a string

CPallini31-Jul-09 0:23

CPallini

31-Jul-09 0:23

vikas choudhry wrote:

i am new in this C field so please provide me code to implement it.

May I politely ask you to read forum posting guidelines [^]?

About your problem, what is your doubt about? Aren't you able to traverse the string? Aren't you able to differentiate among alphabetic character and numeric character?
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.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: match the character of a string

Chandrasekharan P31-Jul-09 0:25

Chandrasekharan P

31-Jul-09 0:25

vikas choudhry wrote:
i am new in this C field

are you a student?

Re: match the character of a string

Rajesh R Subramanian31-Jul-09 0:29

Rajesh R Subramanian

31-Jul-09 0:29

Run a loop for the length of the string, check each character to find if it is an alphabet or a number. Invalidate, as per requirements. What have you done so far and where are you stuck?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: match the character of a string [modified]

Adam Roderick J31-Jul-09 0:40

Adam Roderick J

31-Jul-09 0:40

If you are going for pure c program then

take the character array and check each character with the ASCII range.
say
ur char ch[350]

if( 48 >= ch[i] &&
57 <= ch[i] ) then it is numerical

if(( 65 >= ch[i] || 97 >= ch[i] ) &&
( 90 <= ch[i] || 122 <= ch[i] )
then it will be alphabets
Smile | :)

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modified on Friday, July 31, 2009 6:46 AM

Re: match the character of a string

vikas choudhry31-Jul-09 2:48

vikas choudhry

31-Jul-09 2:48

thanks!!

Re: match the character of a string

Sauce!31-Jul-09 3:57

Sauce!

31-Jul-09 3:57

There's also this...

#include <string>
using std::string;

string str1 = "abc123";

if(str1.find_first_of("0123456789") != string::npos)
{
     //String contains numeric characters.
}<pre>

Conversion of CBitmap into Array of BYTE and Vice Versa

Madhu_Rani30-Jul-09 23:56

Madhu_Rani

30-Jul-09 23:56

Hi,
I had a simple client/server application that excahnges text data through array of bytes (BYTE byBuffer[256]). Now the server wants to transmit the image data (CBitmap) to the client. How the CBitmap object can be converted into array of bytes and then on receiving end (client) it can be converted back into CBitmap.

THANKS.

Re: Conversion of CBitmap into Array of BYTE and Vice Versa

Adam Roderick J31-Jul-09 0:12

Adam Roderick J

31-Jul-09 0:12

To get the CBitmap to byte use

GetBitmap( BITMAP* pBitMap ); refer http://msdn.microsoft.com/en-us/library/279a3c0c(VS.80).aspx[^]

of CBitmap where LPVOID bmBits member of BITMAP will having the byte array.

To set the BYTE array to CBitmap, you can use DWORD SetBitmapBits( DWORD dwCount, const void* lpBits ); you can set your byte array to lpBits.
Smile | :)

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Re: Conversion of CBitmap into Array of BYTE and Vice Versa

Madhu_Rani31-Jul-09 0:50

Madhu_Rani

31-Jul-09 0:50

Thanks.

I am facing problems with GetBitmap , however GetBitmapBits is giving me byte of array properly.( I guess). but I am unable to get the size of these bits for SetBitmapBits( DWORD dwCount, const void* lpBits ).

Re: Conversion of CBitmap into Array of BYTE and Vice Versa

Adam Roderick J31-Jul-09 1:43

Adam Roderick J

31-Jul-09 1:43

you getting any error in GetBitmapBits?
r u not getting the size?

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