C / C++ / MFC

Re: transfering image pixel by pixel using MFC

3-Mar-04 10:26

Have you tried SetPixel()?

onwards and upwards...

Christian Graus3-Mar-04 10:34

Christian Graus

3-Mar-04 10:34

SetPixel is as slow as anything - what you need is for the image you put up to be a DIBSEction ( there's a nice DIBSection wrapper here on CP ), so that you can set the pixel values directly.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Is there a safe and fast way to tell if a thread is SUSPENDED?

John M. Drescher3-Mar-04 9:38

John M. Drescher

3-Mar-04 9:38

I have a pool of threads and I need to know if all the threads are suspended so that the pool itself does not cause a deadlock condition. I need to know if there is an easy and fast way to tell if a thread is suspended.

John

Re: Is there a safe and fast way to tell if a thread is SUSPENDED?

basementman3-Mar-04 10:44

Re: Is there a safe and fast way to tell if a thread is SUSPENDED?

3-Mar-04 10:44

You could have each thread keep track of it's state by having the threads write a blocked marker to a global area just prior to calling a blocking function, and then write a running marker after the blocking call completes.

And if you are using real OVERLAPPED structures, an idea from Platform SDK:

HasOverlappedIoCompleted

The HasOverlappedIoCompleted macro provides a high performance test operation that can be used to poll for the completion of an outstanding I/O operation.

Bottom line, there is not a GetThreadState() WINAPI that I know of or can find.

onwards and upwards...

John M. Drescher3-Mar-04 11:14

John M. Drescher

3-Mar-04 11:14

basementman wrote:
You could have each thread keep track of it's state by having the threads write a blocked marker to a global area just prior to calling a blocking function, and then write a running marker after the blocking call completes.
In my code this would be to much work because any one of 100+ functions may block... Although I am not throwing this idea away yet.

basementman wrote:
And if you are using real OVERLAPPED structures
No, only in a few of the operations.

basementman wrote:
Bottom line, there is not a GetThreadState() WINAPI that I know of or can find.

I could call SuspendThread then ResumeThread to get the info I need but that seems wasteful. A second idea is to use GetThreadTimes to determine if any work has been done since the last time I checked this again seems wasteful...

Thanks for your help,
John

WM_MENUSELECT

benny23233-Mar-04 9:15

benny2323

3-Mar-04 9:15

Hi,

Is there anyway to tell the difference between the user selects a menu item other than just browse through the menu items without click?

I tried to capture the WM_MENUSELECT message but this message always got sent in both of these situations. That is this message is sent when the user browse from one item to another, and also when user click to select an item.

Is there any message other than WM_COMMAND that i can capture when the user actually clicks on the menu item.

What i want is to tell the difference between a browse and a click inside the OnMenuSelect() function.

Regards

Re: WM_MENUSELECT

Michael Dunn3-Mar-04 10:43

Michael Dunn

3-Mar-04 10:43

From the docs:

If the high-order word of wParam contains 0xFFFF and the lParam parameter contains NULL, the system has closed the menu.

That's the test to see if the menu is closing.

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
If my rhyme was a drug, I'd sell it by the gram.

Retrieving Dates from Access Database using ODBC

pavneet3-Mar-04 8:50

Re: Retrieving Dates from Access Database using ODBC

3-Mar-04 8:50

I'm working on Access Database with VC++ 6.0 as frontend using ODBC programming...Functions like SQLBindParameter,SQLExecute....Though the data is correctly saved in the Database,I got troubled while retrieving fields of Date/Time and Integer..Other fields are being retrieved properly..I'm using following snippet of code to retrieve Date

sr = SQLBindCol(hstmt,6,SQL_TYPE_TIMESTAMP,date,sizeof(date),&ld);<br />
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
{<br />
    displayError(sr, "Error in binding 6");<br />
}<br />

The variable date is CTime date[11].The value comes out weird Eek! | :eek:

Can somebody please give me some suggestions?
Thanks

basementman3-Mar-04 10:47

Re: Retrieving Dates from Access Database using ODBC

3-Mar-04 10:47

This function has been working great for about 8 years now...

SYSTEMTIME *DBStatement::GetDate(int iColumnNum, SYSTEMTIME *spDateTime /*=NULL*/)
{
  short iStatus = -1;

  if (!spDateTime)
    spDateTime = &m_sDateTime;

  memset(spDateTime,0,sizeof(SYSTEMTIME));

  if (m_hStmtHdl)
    {
      ResetError();

      SQL_TIMESTAMP_STRUCT sTS;
      long lColSize = 0;

      iStatus = ::SQLGetData(m_hStmtHdl,iColumnNum,SQL_C_TIMESTAMP,&sTS,sizeof(SQL_TIMESTAMP_STRUCT),&lColSize);
      if (iStatus == SQL_SUCCESS || iStatus == SQL_SUCCESS_WITH_INFO)
        {
          if (iStatus == SQL_SUCCESS_WITH_INFO)
            iStatus = SQL_SUCCESS;

          SetNullValue(lColSize == SQL_NULL_DATA);
          if (lColSize != SQL_NULL_DATA)
            {
              spDateTime->wYear = sTS.year;
              spDateTime->wMonth = sTS.month;
              spDateTime->wDay = sTS.day;
              spDateTime->wHour = sTS.hour;
              spDateTime->wMinute = sTS.minute;
              spDateTime->wSecond = sTS.second;
              // spDateTimeStruct->wMilliseconds = (USHORT)sTS.fraction;
            }
        }
      else
        UpdateDBError();
    }
  else
    NoActiveStatement();

  return spDateTime;
}

onwards and upwards...

pavneet7-Mar-04 8:32

Re: Retrieving Dates from Access Database using ODBC

7-Mar-04 8:32

Hey that was really nice of u too help.Can u tell me what is m_sDateTime...That will be of real help..
Thanks

basementman8-Mar-04 3:43

Re: Retrieving Dates from Access Database using ODBC

8-Mar-04 3:43

It is a class member that allows you to get a pointer to a SYSTEMTIME struct without having to pass one in. This provides some flexibility in that you can pass a param to be filled in, or have the class return a pointer to a struct without passing a param.

onwards and upwards...

pavneet8-Mar-04 8:40

Re: Retrieving Dates from Access Database using ODBC

8-Mar-04 8:40

Hey thanks for all the help, I worked out an easier way to do it...Just struck it today..

DATE_STRUCT date;

sr = SQLBindCol(hstmt,1,SQL_C_TYPE_DATE,&date,sizeof(SQL_DATE_STRUCT),&ld);
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)
{
displayError(sr, "Error in binding 1");
}
The structure is exactly what the SQL query wants and works perfectly...
Thanks for everythng once again

Jesse Evans18-Mar-04 12:32

Jesse Evans

18-Mar-04 12:32

Hi, pavneet!

I'm trying to go the other way: getting system time from a client PC and sending it to an SQL Server database.

Here's a code snippet. The table column OPENDATE is type datetime and I'm binding it to a variable in my app:

time_t now;<br />
struct tm *localNow;<br />
TIMESTAMP_STRUCT tsOpenDate;<br />
char* szStmt = "INSERT INTO ORDERS (ORDERID, CUSTID, OPENDATE, SALESPERSON, STATUS) VALUES (?, ?, ?, ?, ?)";<br />
<br />
SQLDescribeParam(hstmt, 3, &DataType, &ParamSize, &DecimalDigits, &Nullable);<br />
SQLBindParameter(hstmt, 3, SQL_PARAM_INPUT, SQL_C_TYPE_TIMESTAMP, SQL_TYPE_TIMESTAMP, ParamSize, DecimalDigits, &tsOpenDate, 0, &cbOpenDate); <br />
<br />
time (&now);<br />
localNow = localtime (&now);<br />
<br />
tsOpenDate.year = localNow->tm_year;<br />
tsOpenDate.month = localNow->tm_mon;<br />
tsOpenDate.day = localNow->tm_mday;<br />
tsOpenDate.hour = localNow->tm_hour;<br />
tsOpenDate.minute = localNow->tm_min;<br />
tsOpenDate.second = localNow->tm_sec;<br />
tsOpenDate.fraction = 0;

The problem is that the values in the localNow structure are offsets from a '0' date (I think it's 1.1.1900), whereas the data table wants a real calendar date. Thus, the SQLExecute() call fails.

I know I can use the ASCII time conversion functions to get strings for all the datetime parts (strftime), and then convert those to integers (atoi), but there must be an easier way!!!

'til next we type...
HAVE FUN!! -- Jesse

Re: Retrieving Dates from Access Database using ODBC

pavneet19-Mar-04 9:34

Re: Retrieving Dates from Access Database using ODBC

19-Mar-04 9:34

hi jesse,
Actually its easier to add the date as CString's rather then the hard way out.

	Ctime time;<br />
        CString m_appdate;<br />
	time = time.GetCurrentTime();<br />
	m_appdate = time.Format("%d-%m-%y");<br />
	const char *appdate = (LPCTSTR)m_appdate;<br />
	SQLINTEGER cappdate = SQL_NTS;<br />
<br />
<br />
	sr = SQLBindParameter(hstmt,6,SQL_PARAM_INPUT,<br />
		SQL_C_TCHAR,SQL_C_TCHAR,10,0,<br />
		(void *)appdate,sizeof(appdate),&cappdate);<br />
	if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
	{<br />
		displayError(sr,"Error in Binding 6");<br />
	}

I think that will help u out......
Pavneet

Jesse Evans22-Mar-04 6:07

Jesse Evans

22-Mar-04 6:07

Pavneet,

Thanks for your response. In my case, this will not work, as the datatype of the date column is datetime and the Bind call fails unless you use SQL_C_TYPE_TIMESTAMP to describe it.

After reviewing the documentation on localtime, I found I can fix up the date in the following manner:

time (&now);<br />
localNow = localtime (&now);<br />
printf ("%s", asctime (localNow));<br />
<br />
memset (&tsOpenDate, 0, sizeof(tsOpenDate));<br />
tsOpenDate.year = localNow->tm_year + 1900;<br />
tsOpenDate.month = localNow->tm_mon + 1;<br />
tsOpenDate.day = localNow->tm_mday;<br />
tsOpenDate.hour = localNow->tm_hour;<br />
tsOpenDate.minute = localNow->tm_min;<br />
tsOpenDate.second = localNow->tm_sec;

'til next we type...
HAVE FUN!! -- Jesse

Re: Retrieving Dates from Access Database using ODBC

Jesse Evans22-Mar-04 7:16

Jesse Evans

22-Mar-04 7:16

Pavneet,

Found another way to get the timestamp without the fixup that locatime needs: An SDK function called GetLocalTime

Here's another code snippet showing its use:

SYSTEMTIME systemTime;<br />
GetLocalTime (&systemTime);<br />
<br />
memset (&tsOpenDate, 0, sizeof(tsOpenDate));<br />
tsOpenDate.year = systemTime.wYear;<br />
tsOpenDate.month = systemTime.wMonth;<br />
tsOpenDate.day = systemTime.wDay;<br />
tsOpenDate.hour = systemTime.wHour;<br />
tsOpenDate.minute = systemTime.wMinute;<br />
tsOpenDate.second = systemTime.wSecond;<br />

'til next we type...
HAVE FUN!! -- Jesse

Multi Column Combo Box class

DougW483-Mar-04 8:25

DougW48

3-Mar-04 8:25

Has anybody here used the CMultiColumnComboBox class written by Xiao Wu Guang? The link is http://www.codeproject.com/combobox/mccombobox.asp#xx737862xx. In the posts at the end of the artice, there are some problems with using this class in Windows 2000/XP. Unfortunately, the link to the fix doesn't work anymore. Does anybody know how to make this class work correctly in Windows 2000/XP? It would be nice if one of the better programmers on here (definitely not me) would update this class and repost it with all the fixes! Thanks Smile | :)

Re: Multi Column Combo Box class

BrutalDeath04-Mar-04 23:41

BrutalDeath0

4-Mar-04 23:41

Hi, I use the MultiColumnComboBox class, I made some changes (which I found in the forum), here is the additional code :

.cpp :
------
in the DrawItem() function, under :
CRect TextRectangle = lpDrawItemStruct->rcItem;
// **** Additional coding Start ****
if (DropDownWindowPointer == NULL)
{
if((GetWindowLong(m_hWnd, GWL_STYLE) & 0x3) == CBS_DROPDOWN)
{
DropDownWindowPointer = GetWindow (GW_CHILD);
}
if((GetWindowLong(m_hWnd, GWL_STYLE) & 0x3) == CBS_DROPDOWNLIST)
{
DropDownWindowPointer = GetWindow (GW_HWNDFIRST);
}
}
// **** Additional coding End ****

under // if vertical scrool bar is visible : replace :
if ((ColumnIndex == m_TotalColumn - 1 || (ColumnIndex == m_TotalColumn - 2 && m_ColumnWidth[m_TotalColumn - 1] == 0)) && (DropDownWindowPointer->GetStyle() & WS_VSCROLL))
TextRectangle.right -= GetSystemMetrics(SM_CXVSCROLL);

BY :
DeviceContextPointer->DrawText(m_ColumnItemList[ColumnIndex].GetAt(m_ColumnItemList[ColumnIndex].FindIndex(lpDrawItemStruct->itemID)), -1, TextRectangle, m_ColumnAlignStyle[ColumnIndex] | DT_SINGLELINE | DT_NOPREFIX | DT_VCENTER);

I think it's all;
if you still have a problem, just answer and I'll send you the complete file.

BrutalDeath0

Modeless Dialog

ERKs3-Mar-04 8:16

ERKs

3-Mar-04 8:16

I have an MFC application that displays a modeless dialog during a file transfer with the status information. That all works fine, I can update the info in the dialog box with the current file transfer status info. The problem is the user can still try to interact with the main window while this modeless dialog is displayed. What I would like is to have the modeless dialog behave similar to a modal dialog where the user can only interact with that dialog and not access the main view. I do not want to use a modal dialog because the main program needs to continue processing the file transfer. Any ideas on what is the best way to do this?

DougW483-Mar-04 8:19

DougW48

3-Mar-04 8:19

Have the main program process your file transfer in a thread, then you'll be able to use a modal dialog box. That's probably not exactly what you were looking for, but it's what I'd try first. Good luck

Maximilien3-Mar-04 8:50

Maximilien

3-Mar-04 8:50

maybe by using CWnd::EnableWindow on the main window can do the trick.

Maximilien Lincourt
Your Head A Splode - Strong Bad

James R. Twine3-Mar-04 9:16

James R. Twine

3-Mar-04 9:16

Note that you may have to call CWnd::EnableWindow( TRUE ) on the modeless dialog after calling CWnd::EnableWindow( FALSE ) on the parent...

Disabling the parent tends to take child windows with it.

Peace!

-=- James (Sonork:100.21837)
[Tip for SUV winter driving survival: "Professional Driver on Closed Course" does not mean "your Dumb Ass on a Public Road"!]
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