Re: Write a tiff file to disk - C / C++ / MFC Discussion Boards

What is the difference between following declarations ?

PrafullaVedante30-Oct-12 22:52

PrafullaVedante

30-Oct-12 22:52

1 )

C++

int a;
a = 5;

2 )

C++

int a(5);

3 )

C++

int a = 5;

Prafulla Vedante

Re: What is the difference between following declarations ?

Richard MacCutchan30-Oct-12 23:07

Richard MacCutchan

30-Oct-12 23:07

In case 1 you have declared the variable a but it has no value; in reality it will but its contents will be random. The second statement assigns the value 5 to variable a. These two statements do not need to be together, as a can have its value set or reset anywhere it is in scope.

Cases 2 and 3 are the same, the variable is declared and initialised at the same time.

One of these days I'm going to think of a really clever signature.

Re: What is the difference between following declarations ?

Orjan Westin30-Oct-12 23:37

Orjan Westin

30-Oct-12 23:37

1. Declaration (after which the variable will be uninitialised, with an unknown value) followed by assignment.

2. Declaration with initialisation. For POD (Plain Old Data, built-in) types, this is effectively no different to 3. but with a class/struct type this would call a different constructor (taking an int parameter, rather than the default constructor).

3. Declaration followed by assignment. Again, for a POD type no different from 2. but with a class/struct type the value 5 could be implicitly converted to the class/struct type in a custom constructor before the assignment, or an assignment operator taking an int could be called.

In questions of declaration, initialisation, assignment and so on, what POD types do is well known and specified in the standard, but what class/struct types do depend on their implementation to a much larger extent.

Re: What is the difference between following declarations ?

Stefan_Lang7-Nov-12 2:49

Stefan_Lang

7-Nov-12 2:49

Not quite correct. Cases 2 and 3 are equivalent - the assignment operator is, in fact, not used in case 3, not even for a custom class with an override for operator=().

See GotW#1 for further explanations. I have to admit I wouldn't have known the (lack of) difference before checking that site.

Re: What is the difference between following declarations ?

Orjan Westin8-Nov-12 9:07

Orjan Westin

8-Nov-12 9:07

Ah, thank you.

Write a tiff file to disk

Marcio Kugler Rodrigues30-Oct-12 7:50

Marcio Kugler Rodrigues

30-Oct-12 7:50

Hello all,
I'm new to C and i received a challenge to work on a project to integrate 2 different machines. One of the machines is a scanner. A protocol was developed to make the conversation" between the 2 machines possible using the serial over USB physical link.

I have the specification of this protocol with the commands that the scanner can receive and what is the expected response. All commands work perfectly however i'm in doubt on how to retrieve the image from the scanner.
See the command definition below:

Request syntax :
000200000000crc16

The scanner response in case of success will be :
[“0002”][length][image data in binary][crc16]

As The payload field in this response will be a BINARY stream of octets that needs no further conversion prior to be saved in a file or to be delivered to its final destination.

To better ilustrate the response is something like:
000200006690bin_datacrc
Where:
0002 is the command
00006690 is the lenght of the img data
bin_data is bin image data
crc

The problem is that i don't know how to handle BINARY stream of octets. I read a couple of articles but they are always related to read bin data from files and in this case we have a stream and i'm not sure if it's the same.

Do you know a possible solution to write this BINARY stream of octets in a file ???
If someone can share some info i really appreciate it!!!
Thanks and congrats for the great job you guys do here at the forums...

Simplicity is the Ultimate Sophistication!!!

Re: Write a tiff file to disk

Richard MacCutchan30-Oct-12 8:37

Richard MacCutchan

30-Oct-12 8:37

Just use the BYTE (or unsigned char) type to read and write. I don't know what I/O functions you are using, but you could use the CRT Stream IO functions[^]. Thus to read and write you would do something like:

C++

FILE* fin = fopen("inputfilename", "rb");
FILE* fout = fopen("outputfilename", "wb");
DWORD count = ??; // number of bytes to read
BYTE buffer[999]; // make this big enough for largest block
int nread, nwritten;
do
{
    nread = fread(buffer, sizeof(BYTE), count, fin);
    if (nread < 1)
        break; // no more data
    if (nwritten < fwrite(buffer, sizeof(BYTE), count, fout))
    {
        // error occurred
    }
} while (nread > 0);

Obviously this needs expanding but it should give you the idea.

One of these days I'm going to think of a really clever signature.

Re: Write a tiff file to disk

CPallini30-Oct-12 23:03

CPallini

30-Oct-12 23:03

Marcio Kugler Rodrigues wrote:
Do you know a possible solution to write this BINARY stream of octets in a file ???

It is just a bunch of bytes. If you have the pointer to the first of them (that is the address of the start location wherein you have read them), say buffer, then you have just to issue (assuming you are working on Windows OS):

C++

FILE * fp = fopen("my_image.tiff", "wb");
if ( fp )
{
  if ( length != fwrite(buffer, 1, length, fp) )
  {
    // handle error 
  }
  fclose(fp);
}
else
{
  // handle error
}

Veni, vidi, vici.

GUI enabled for service under windows 2008

es196830-Oct-12 3:58

es1968

30-Oct-12 3:58

Hello everybody,

How can I enabled a service to interact with desktop in 2008 Windows server OS ?

I have a MFC application which is run by being called by another service which its properties are localsystem and interact with desktop.
It works fine at 2003 Windows server OS, but I face problems with 2008 Windows OS (NO GUI enable though I see it as a running process)

Any clue how to let it enables the GUI ?

I searched the internet and forums for any idea but with not much help.

Please advice.
Thanks in advance,
Eyal

Re: GUI enabled for service under windows 2008

Richard MacCutchan30-Oct-12 10:38

Richard MacCutchan

30-Oct-12 10:38

es1968 wrote:
how to let it enables the GUI ?

It doesn't. Services run in the background and are prevented from having a Windows front end, specifically because they do not have user interaction. You can provide an interface so a normal GUI based program can pass information to and from the service, but that's all that is allowed.

One of these days I'm going to think of a really clever signature.

OnPaint not executed

_Flaviu29-Oct-12 22:20

_Flaviu

29-Oct-12 22:20

I have an layered window over a CMyView derived from CScrollView. This layered window are created, but are not painting, I mean CLayered::OnPaint are not calling (ON_WM_PAINT is properly mapped)... there is any reason to CWnd::OnPaint not being executed ? Thank you.

Re: OnPaint not executed

Richard MacCutchan29-Oct-12 22:57

Richard MacCutchan

29-Oct-12 22:57

Flaviu2 wrote:
is any reason to CWnd::OnPaint not being executed

If this was true then nothing would work. You need to look again at your program to ensure that all events are correctly wired up.

One of these days I'm going to think of a really clever signature.

Re: OnPaint not executed

_Flaviu29-Oct-12 23:21

_Flaviu

29-Oct-12 23:21

Thank you Richard, I solved. The area of the layered window was 0. My mistake.

Removing repeated path

sarfaraznawaz29-Oct-12 19:32

sarfaraznawaz

29-Oct-12 19:32

Hi,
i have inserted the item in list as a file name or path now again i don't want insert the same path in an list control.

i tried with clist find item but i couldn't make it ......

please help me

Re: Removing repeated path

_Flaviu29-Oct-12 22:12

_Flaviu

29-Oct-12 22:12

CList have CList::Find[^] method ... did you used ? Or you refer on CListBox ?

Re: Removing repeated path

Richard MacCutchan29-Oct-12 22:59

Richard MacCutchan

29-Oct-12 22:59

sarfaraznawaz wrote:
i tried with clist find item but i couldn't make it

We have no way of guessing what this could mean. Please explain clearly, with code extracts, what you are trying to do and what results you are seeing.

One of these days I'm going to think of a really clever signature.

Re: Removing repeated path

sarfaraznawaz29-Oct-12 23:29

sarfaraznawaz

29-Oct-12 23:29

sorry for not explaining
m_listCrl = DEBUG_NEW CListCtrl;
if(!m_listCrl->Create(WS_CHILD|WS_VISIBLE|LVS_REPORT|LVS_AUTOARRANGE,/*CRect(65, 100, 960, 448)*/CRect (60, 105, 954, 435),this,IDC_LIST_CTRL))
{
TRACE ("\nDBG:\tFailed to create window object for List ctrl at line %u in %s.", __LINE__, __FILE__);
return -1;
}

GetPrivateProfileString (_T ("Remo Eraser"), _T ("IDS_CLOUMN1"), NULL, (LPWSTR)szNewText, sizeof(szNewText), m_szPath);

m_listCrl->GetHeaderCtrl();
m_listCrl->InsertColumn(1,(LPWSTR)szNewText,LVCFMT_LEFT,75+75+25+50+25+25+25,-1);

GetPrivateProfileString (_T ("Remo Eraser"), _T ("IDS_CLOUMN2"), NULL, (LPWSTR)szNewText, sizeof(szNewText), m_szPath);
m_listCrl->InsertColumn(2,(LPWSTR)szNewText,LVCFMT_CENTER,75+75+25+50+25+25+25+10,-1);

GetPrivateProfileString (_T ("Remo Eraser"), _T ("IDS_CLOUMN3"), NULL, (LPWSTR)szNewText, sizeof(szNewText), m_szPath);
m_listCrl->InsertColumn(3,(LPWSTR)szNewText,LVCFMT_CENTER,75+75+25+50+25+25+10-1);
m_listCrl->InsertItem(0,File_Name,NULL);
m_listCrl->SetItemText(0,1,m_Filepath);
m_listCrl->SetItemText(0,2,_T("10KB"));

<pre lang="c++">

here is the code
am adding the file name and file path in an Clist ctl.
am dont want to add the same file name or path in an list .
i tried with FindItem // info.flags =/* LVFI_PARTIAL|LVFI_STRING*/LVFI_PARAM;
// info.psz = m_Filepath;

// Delete all of the items that begin with the string.
// index = m_listCrl->FindItem(&info);
// while ((index = m_listCrl->FindItem(&info))!= -1)
// {
// MessageBox(_T("File Already exists "),_T("Inforamtion"),MB_ICONINFORMATION);
// m_listCrl->DeleteItem(index);
//
// }
<

Re: Removing repeated path

Richard MacCutchan30-Oct-12 0:40

Richard MacCutchan

30-Oct-12 0:40

First comment, please use <pre> tags around code snippets, as I have done below.
Your LVFINDINFO.flags are wrong, and should be as follows:

C++

info.flags = LVFI_STRING;
info.psz = m_Filepath;
 
index = m_listCrl->FindItem(&info);
if (m_listCrl->FindItem(&info) == -1)
{
    // File path not found
}

One of these days I'm going to think of a really clever signature.

Re: Removing repeated path

David Crow30-Oct-12 3:18

David Crow

30-Oct-12 3:18

sarfaraznawaz wrote:
m_listCrl->InsertColumn(1,(LPWSTR)szNewText,LVCFMT_LEFT,75+75+25+50+25+25+25,-1);

Are you seriously doing this in production code or is this just a personal project?

sarfaraznawaz wrote:
m_listCrl->InsertItem(0,File_Name,NULL);
m_listCrl->SetItemText(0,1,m_Filepath);
m_listCrl->SetItemText(0,2,_T("10KB"));

This should be:

int nItem = m_listCrl->InsertItem(0, File_Name);
m_listCrl->SetItemText(nItem, 1, m_Filepath);
m_listCrl->SetItemText(nItem, 2, _T("10KB"));

sarfaraznawaz wrote:

here is the code
am adding the file name and file path in an Clist ctl.
am dont want to add the same file name or path in an list .
i tried with FindItem

You should be using some other data structure that is better suited for searching, or one that doesn't allow duplicates to begin with. Populate the list control from that.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

WIC/C++: People Tagging: Unable to set the People Tagging metadata

Morpheus2matrix29-Oct-12 9:27

Morpheus2matrix

29-Oct-12 9:27

Hi,

Using C++, I'm trying to use the People Tagging feature by setting the PersonDisplayName property. I've tried this code:

C++

Tools::Check(piFrameEncode->GetMetadataQueryWriter(&piFrameQWriter));
		
// Add additional metadata.
PROPVARIANT value;
PropVariantInit(&value);

value.vt = VT_LPWSTR;
value.pwszVal= L"Thomas LEBRUN";
		
Tools::Check(piFrameQWriter->SetMetadataByName(L"/xmp/<xmpstruct>MP:RegionInfo/<xmpbag>MPRI:Regions/PersonDisplayName", &value));

Unfortunately, this code throws the follonwing exception: "Additional information: The parameter is incorrect."
If I change the metadata name and tried to use the "Title" property, all works fine.

Anyone see where is my error ?

Thanks!

I'm new and french : forgive my mistackes Big Grin | :-D

Re: WIC/C++: People Tagging: Unable to set the People Tagging metadata

enhzflep29-Oct-12 15:27

enhzflep

29-Oct-12 15:27

Interesting question! I had no idea w7 had this kind of a feature, even if it appears not to be implemented on the desktop.

I had a look at the MSDN page[^], and noticed that fields relating to Window Live appeared to be optional. I then checked out this[^] article and noticed that it says you need to know some people with Windows Live ID to _easily_ get some people tags.

With that in mind, I'd consider logging in there and seeing if I could tag an image, before bringing it back and examining it's properties, finally trying to either (a) set the very same properties to a new image or (b) just re-applying the same details to the photo.

Aint life 'grand' when the documentation is so thin on the ground? Laugh | :laugh:

Make it work. Then do it better - Andrei Straut

Re: WIC/C++: People Tagging: Unable to set the People Tagging metadata

Morpheus2matrix29-Oct-12 22:06

Morpheus2matrix

29-Oct-12 22:06

Hi,

Thanks for your answer !

I've already check the metadata on a image where people have been tagged but I don't know which property name I should using on that line:

C++

piFrameQWriter->SetMetadataByName(L"/xmp/<xmpstruct>MP:RegionInfo/<xmpbag>MPRI:Regions/PersonDisplayName", &value)

Any ideas ?

Thanks,

-Thomas

I'm new and french : forgive my mistackes Big Grin | :-D

Re: WIC/C++: People Tagging: Unable to set the People Tagging metadata

enhzflep30-Oct-12 9:16

enhzflep

30-Oct-12 9:16

You're welcome. Thanks for the heads-up on the feature.

Hmm, my eyes still hurt after looking at the MS 'documentation'. It makes reading the PDF 1.6 specification seem like an enjoyable pass-time.

I'll let you know if I come across anything that seems useful.

Make it work. Then do it better - Andrei Straut

Re: WIC/C++: People Tagging: Unable to set the People Tagging metadata

Morpheus2matrix30-Oct-12 21:56

Morpheus2matrix

30-Oct-12 21:56

Thanks for your help: I have to say that I would really appreciate a bit help (or cleaner Poke tongue | ;-P

) documentation on this point ! Smile | :)

I'm new and french : forgive my mistackes Big Grin | :-D

fputc() writes an extra character

Member 923664029-Oct-12 5:25

Member 9236640

29-Oct-12 5:25

I've written a simple program to parse a text file and create a binary file from it.

The program scans every character of the text file looking for "0x" and then writes the next two characters in the new file as their binary value (0x00 - 0xff)

However I'm finding that an extra binary character (value 0x0d) is being written to location 0x0a in the output binary file.

Have I made a stupid mistake in my code?

I'm using GCC - could it be the compiler?

Could it be a non printable character in the input file?

Thanks,
Andy

C++

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


FILE *src;
FILE *dst;
char sstr[100];
int ch;

int ReadString(void)
{
    if(fgets(sstr,100,src) != NULL)
    {
        printf("\n%s",sstr);
        ch = 0;
        return 1;
    }
    else
    {
        return 0;
    }
}

int main()
{
    char dstr[100];
    char c;
    unsigned char h;
    int state = 0;

    printf("Enter File Path and Name to Open\n");
    scanf("%s",sstr);
    src = fopen(sstr,"r");
    if(src == NULL)
    {
        printf("Error Opening File %s\n",sstr);
        return 0;
    }
    else
    {
        printf("Successfully Opened File %s\n",sstr);
    }

    ch = (strchr(sstr,'.') - sstr) + 1;
    strncpy(dstr,sstr,ch);
    dstr[ch++] = 'b';
    dstr[ch++] = 'i';
    dstr[ch++] = 'n';
    dstr[ch] = 0;
    dst = fopen(dstr,"w");

    if(dst == NULL)
    {
        printf("Error Creating File %s\n",dstr);
        fclose(src);
        return 0;
    }
    else
    {
        printf("Successfully Opened File %s\n",dstr);
    }

    if(!ReadString())
    {
        fclose(src);
        fclose(dst);
        return 0;
    }

    while(sstr[ch]!=0)
    {
        switch(state)
        {
            case 0: // read a char
                c = sstr[ch++];
                if(c == '/')    // Comment line
                {
                    state = 20;
                }
                if(c == '0')    // Start of "0x" string
                {
                    state = 10;
                }
            break;

            case 10: // "0x" string?
                c = sstr[ch++];
                if(c == 'x')    // Yes
                {
                    h = 0;
                    state = 11;
                }
            break;

            case 11:
                c = sstr[ch++];
                if((c > 0x2F) && (c < 0x3A)) // 0 - 9
                {
                    h = c - 0x30;
                }
                if((c > 0x40) && (c < 0x47)) // A - F
                {
                    h = c - 0x37;
                }
                if((c > 0x60) && (c < 0x67)) // a - f
                {
                    h = c - 0x57;
                }
                h = h << 4;
                state++;
            break;

            case 12:
                c = sstr[ch++];
                if((c > 0x2F) && (c < 0x3A)) // 0 - 9
                {
                    c = c - 0x30;
                }
                if((c > 0x40) && (c < 0x47)) // A - F
                {
                    c = c - 0x37;
                }
                if((c > 0x60) && (c < 0x67)) // a - f
                {
                    c = c - 0x57;
                }
                h = h + c;
                fputc(h,dst);
                state = 0;
                if(h<0x10)
                    printf("0");
                printf("%X ",h);
            break;

            case 20: // Comment Line?
                c = sstr[ch++];
                if(c == '/') // Yes
                {
                    if(!ReadString()) // Read Next Line
                    {
                        fclose(src);
                        fclose(dst);
                        return 0;
                    }
                    state = 0;
                }
            break;
        }
        if((ch>=100) || (sstr[ch] == 0))
        {
            if(!ReadString())
            {
                fclose(src);
                fclose(dst);
                return 0;
            }
        }
    }

    fclose(src);
    fclose(dst);
    return 0;
}

Input file text:

0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,

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