C / C++ / MFC

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?

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[^]

Величие не Бога может быть недооценена.

adichavan31-Jul-09 0:56

Re: display 256 color bitmap image [modified]

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........

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[^]

Величие не Бога может быть недооценена.

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

adichavan31-Jul-09 1:21

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.

Adam Roderick J31-Jul-09 1:45

Adam Roderick J

31-Jul-09 1:45

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

Величие не Бога может быть недооценена.

adichavan31-Jul-09 19:40

match the character of a string

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.

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.

_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_

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

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.

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 | :)