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i don't understand your problem... why can't you use strncpy() ?
you say you want to read it after getting the int value, but isn't it what i'm doing there ?
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No, No.
You take me wrong way. There is no connection between int value and the string. Let me explain it again.
Stream has two parts. First part give an int value. It gives the first 4 bytes of the stream. That is ok.
Second part has a string, few characters. I want to read it as well and find the word there has.
No connection with int value(nSize according to your code) and the string.
Is it clear...
I appreciate your help all the time...
Eranga 
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ok, so, the int is not the size of the remaining string. then just extract the string without taking care of nSize. can't you ?
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toxcct wrote: ok, so, the int is not the size of the remaining string.
Yes, that is correct.
toxcct wrote: then just extract the string without taking care of nSize. can't you ?
That's where I'm stuck with. Can give me a help.
I appreciate your help all the time...
Eranga
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Eranga Thennakoon wrote: Can give me a help
yes, i can; that's what i'm trying to do. but i need more infos.
1) so, to begin, what have you tried so far to extract the string ?
2) is the string of a constant length ?
3) can you know its length by any method ?
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toxcct wrote: 1) so, to begin, what have you tried so far to extract the string ?
Lots of things I've tried,
<br />
char* varBuffer = new char[(InMsg.GetDataLength() - 4)];<br />
string var_name(&InMsg[3], (InMsg.GetDataLength()-4));<br />
It is better to provide more details. InMsg is in BYTE* to a byte steam. GetDataLength() and GetDataBuffer() are two member functions to get the message and the length. Here in this case my message is included both int value and the string.
toxcct wrote: 2) is the string of a constant length ?
No, string is not in fixed length. Actually contain some small words.
toxcct wrote:
3) can you know its length by any method ?
Yes, string length is less than 4 bytes. (InMsg.GetDataLength()-4)
I appreciate your help all the time...
Eranga
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is the string is nul-terminated ?
also, what is the type of InMsg ???
modified on Thursday, December 06, 2007 8:08:09 AM
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toxcct wrote: is the string is nul-terminated ?
Yes.
toxcct wrote: what is the type of InMsg ???
The type is BYTE*
I appreciate your help all the time...
Eranga
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std::string second_part( (char*)(InMsg+sizof( first_part), InMsg.GetDataLength() - 4))
This calls the constructor of std::string with the address of the first char of the string (InMsg is of type BYTE*? So you need to cast it to char*) and the length of the remaining buffer.
Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
Douglas Adams, "Dirk Gently's Holistic Detective Agency"
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Yes, I don't have cast it.
jhwurmbach wrote: (InMsg+sizof( first_part)
I've not clear this part. Why did you add the first part length.
I appreciate your help all the time...
Eranga
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Ok here are the details.
First thing is,
toxcct wrote: char* pszBuffer = new char[nSize + 1];
I'm not clear why you set the size of buffer to nSize, I mean that int values don't give the number of bytes of the rest of the stream or the string.
I got the following error on this line.
toxcct wrote: ::strncpy(pszBuffer, InMsg.GetDataBuffer(), nSize);
error C2664: 'strncpy' : cannot convert parameter 2 from 'BYTE *' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
I appreciate your help all the time...
Eranga
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Eranga Thennakoon wrote: toxcct wrote:
::strncpy(pszBuffer, InMsg.GetDataBuffer(), nSize);
error C2664: 'strncpy' : cannot convert parameter 2 from 'BYTE *' to 'const char *'
You can esplicitely cast the pointer. But you must provide a meaningful value of nSize.
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.
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CPallini wrote: You can esplicitely cast the pointer.
Can you little more explain this.
Please read my last post. There is no connection between int value and the string.
I appreciate your help all the time...
Eranga
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Eranga Thennakoon wrote: I know that after reading the initial 4 bytes of the stream, stream points to the next byte start position.
memcpy() does not move any pointers around, other than the ones it uses internally. After it finishes, InMsg is in the same state as before.
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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toxcct wrote: 34 bytes on a 64 bits system
Two bytes wide! 
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.
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what ?
hey, not 34, 32 !! lol
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Ive gone quite crazy at microsoft for the weirdness of the CListCtrl, I just want to find out the contents of the selection in my list.. I can only find this:
short Selected = m_MyList.GetSelectionMark();
But that returns the number of the item, if i fill my list with "Linux" and "Windows" then i would like a method which returns "Windows", or "Linux"... Are there any functions for that??
Thanks!
(Using VS6.0 dialog based mfc app...)
//Johannes
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Try:
CString sText;
int nSel;
nSel = m_MyList.GetSelectionMark();
if (sel != -1)
{
sText = m_MyList.GetItemText(nSel, 0);
}
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.
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Can't you check if actual item is different of first / last item before moving?
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?
Help me to understand what I'm saying, and I'll explain it better to you
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson
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Johpoke wrote: short Selected = m_MyList.GetSelectionMark();
Are you using a multiselect list control?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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How to know when the dragging is completed?
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i have a CCD camera that acquires 12 bit image and i have used MFC function BitMapInfoheader function to save it as 8 bit as a result my image displayed is compressed and i loose finer details could u please help to correct my code for 16 bit the code is as below.
Thank you in advance
./* Window.C */
#include "stdafx.h"
#include "afxstr.h"
#include "atlimage.h"
#include "string.h"
extern "C"
{
#include
#include "wingdi.h"
#include "win.h"
#include "master.h"
}
#define ALIGNLONG(i) ((i+3)/4*4)
#define COLORBITS 8
CImage image;
void Draw_Strip( HWND hWnd );
HBRUSH ghbrWhite, ghbrBlack;
void Create_DIB( HWND wnd );
void Draw_DIB( HWND wnd );
/*
* Some handy globals.
*/
CString fullname;
int W, H;
unsigned int Min,Max;
static HBITMAP hBitmap;
static LPBITMAPINFOHEADER lpbi;
static BITMAPINFOHEADER bi;
char *lpstBitmap;
HPALETTE palette;
CString name = "Image";
//CImage image;
/**************************************************
*
* Register this type of window...
*
*
**************************************************/
BOOL RegisterWindow(char *lpClass, HINSTANCE instance)
{
WNDCLASS wc;
ghbrWhite = CreateSolidBrush(0x00FFFFFF);
ghbrBlack = CreateSolidBrush(0x00000000);
wc.style = CS_OWNDC;
wc.lpfnWndProc = (WNDPROC) ImageWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = sizeof(LONG);
wc.hInstance = instance;
wc.hIcon = LoadIcon(NULL,IDC_ARROW);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = ghbrWhite;
wc.lpszMenuName = NULL;
wc.lpszClassName = lpClass;
if (!RegisterClass(&wc))
return FALSE;
else
return TRUE;
}
/**************************************************
*
* Create and show the window....
*
*
**************************************************/
HWND CreateWin( int x,
int y,
int width,
int height,
char *lpClass,
char *name,
HINSTANCE instance)
{
HWND handle;
W = width;
H = height;
handle = CreateWindow(
lpClass, // pointer to registered class name
name, // pointer to window name
WS_VISIBLE | WS_OVERLAPPEDWINDOW, //| WS_VSCROLL | WS_HSCROLL, // window style
x, // horizontal position of window
y+20, // vertical position of window
width, // window width
height, // window height
NULL, // handle to parent or owner window
NULL, // handle to menu or child-window identifier
instance, // handle to application instance
NULL // pointer to window-creation data
);
return (handle);
}
/**************************************************
*
* Handles the messages for this window
*
*
**************************************************/
int WINAPI ImageWndProc(
HWND hwnd,
UINT message,
DWORD wParam,
LONG lParam)
{
switch (message)
{
case WM_PAINT:
Draw_DIB( hwnd );
return 0L;
break;
case WM_SIZE:
return DefMDIChildProc(hwnd, message, wParam, lParam);
break;
case WM_CREATE:
Create_DIB( hwnd );
return 0L;
break;
case WM_CLOSE:
return DefMDIChildProc(hwnd, message, wParam, lParam);
break;
case WM_DESTROY:
return DefMDIChildProc(hwnd, message, wParam, lParam);
break;
default:
return DefMDIChildProc(hwnd, message, wParam, lParam);
break;
}
}
/**************************************************
*
* Create a Device Independent Bitmap...
*
*
**************************************************/
void Create_DIB( HWND hWnd )
{
HDC hDC;
unsigned char i;
long k,j, NumBytes;
LPBITMAPINFO info;
unsigned char *dat;
DWORD error;
hDC = GetDC (hWnd) ;
// Intialize BITMAPINFOHEADER data.
//.................................
bi.biSize = sizeof (BITMAPINFOHEADER) ;
bi.biWidth = W;
bi.biHeight = -H; // top-down DIB
bi.biPlanes = 1;
bi.biBitCount = COLORBITS;
bi.biCompression = BI_RGB;
bi.biSizeImage = ( ALIGNLONG( (W * COLORBITS)/8 ) * H);
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 256;
bi.biClrImportant = 256;
// Allocate memory for BITMAPINFO structure.
//..........................................
NumBytes = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD); // +
//( ALIGNLONG( ( W * COLORBITS ) / 8 ) * H );
lpbi = (BITMAPINFOHEADER*)GlobalAlloc( GPTR, NumBytes );
if( lpbi == NULL )
{
LPVOID lpMsgBuf;
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf, 0, NULL );
// Display the string.
MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK | MB_ICONINFORMATION );
// Free the buffer.
LocalFree( lpMsgBuf );
exit( EXIT_FAILURE ); // Get out now!
}
// Copy BITMAPINFOHEADER information.
//...................................
*lpbi = bi;
// Create The Palette
info = (LPBITMAPINFO) lpbi;
for ( i=0; i<255; i++ )
{
info->bmiColors[i].rgbRed = i;
info->bmiColors[i].rgbBlue = i;
info->bmiColors[i].rgbGreen = i;
info->bmiColors[i].rgbReserved = 0;
}
// Set pointer to bitmap’s bit data.
//..................................
// lpstBitmap = (LPSTR)lpbi + (WORD)sizeof(BITMAPINFOHEADER) +
// (256 * sizeof(RGBQUAD));
hBitmap = ::CreateDIBSection(hDC,(LPBITMAPINFO)lpbi, DIB_RGB_COLORS,(VOID **)&lpstBitmap, NULL,0);
dat = (unsigned char*)lpstBitmap;
for ( k=0; k< H; k++ )
for ( j = 0; j < W; j++ )
*dat++ = (unsigned char)k;
// Create uninitialized DIB bitmap.
//.................................
/* hBitmap = CreateDIBitmap( hDC,
&bi,
0 ,
0,
(LPBITMAPINFO) lpbi, */
error = GetLastError();
ReleaseDC( hWnd, hDC);
}
void Save(int num)
{
CString prefix = "C:\\Documents and Settings\\Garner Lab\\My Documents\\Hyperspectimages\\image";
char buf[4];
itoa(num, buf, 10);
CString number = buf;
CString suffix = ".bmp";
fullname = prefix + number + suffix;
CImage image;
image.Attach(hBitmap);
image.Save(fullname); // save as BMP
image.Detach();
}
/**************************************************
*
* Force repaint and update the display...
*
*
**************************************************/
void Draw_DIB( HWND hWnd )
{
PAINTSTRUCT ps;
HDC hMemDC;
int scan;
DWORD lasterror;
BeginPaint( hWnd, &ps );
hMemDC = CreateCompatibleDC( ps.hdc );
SelectPalette(hMemDC, palette, TRUE);
RealizePalette(hMemDC);
SelectPalette(ps.hdc, palette, TRUE);
RealizePalette(ps.hdc);
scan = SetDIBits(
hMemDC, // handle of device context
hBitmap, // handle of bitmap
0, // starting scan line
H, // number of scan lines
lpstBitmap, // array of bitmap bits
(LPBITMAPINFO) lpbi, // address of structure with bitmap data
DIB_RGB_COLORS ); // type of color indices to use
if ( !scan )
lasterror = GetLastError();
SelectObject( hMemDC, hBitmap );
BitBlt( ps.hdc, 0, 0, W, H,
hMemDC, 0, 0, SRCCOPY );
DeleteDC( hMemDC );
EndPaint( hWnd, &ps );
}
/**************************************************
*
* Set the bits to the bitmap to be displayed...
*
*
**************************************************/
void Update_Bitmap( HWND hwnd, unsigned short *data, int AutoStop )
{
// Alter The Bits via the pointer
int i,j;
unsigned char *dbits = (unsigned char*)lpstBitmap;
unsigned short *head;
static float mp;
unsigned int max, min;
max = 0;
min = 65535;
head = data;
/* Calculate Scaling Factor */
for (i=0; i for (j=0;j {
if ( min > *head ) min = *head;
if ( max < *head ) max = *head;
head++;
Min = min;
Max = max;
}
mp = (float)256 / ( (float)max-(float)min );
/* Transfer Data to 8 bits */
for (i=0; i for ( j=0;j
*dbits++ = (unsigned char)(((float)*data++ - (float)min)*mp);
// force repaint
InvalidateRect( hwnd, NULL, FALSE );
if( AutoStop ); // Get rid of compiler warning
}
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Firt of all, off topic: read the posting guidelines.
Well, it seems that your image is monochromatic.
Speaking about bitmaps, you cannot transfer 12-bit info into a single channel of RGB, since it (as shown by the code snippet) range 0..255. You may transfer such a info, for instance, to two (or three) channels, but then you have false colors. I don't know if it is quite acceptable for you (it depends on image usage, for instance diagnostic,...).
You can also use a different scaling algorithm (maybe a scaling more sensitive on differences on low-intensity pixels and less sensitive on high-intensity ones); this choice depends as well on image final usage.
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.
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