C / C++ / MFC

jawadali47717-May-12 0:21

jawadali477

17-May-12 0:21

but open_host_port () is defined as

portstream_fd open_host_port(char *portname)

CPallini17-May-12 0:33

CPallini

17-May-12 0:33

Well, that is a open_host_port fault.
Why - the fresh Hell - the function needs a not-const string?

However

C++

COMstream = open_host_port((LPSTR)(LPCSTR) testCStr);

should do the trick.

BTW I ask you once again (I'm curious): what library are you using?

Veni, vidi, vici.

jawadali47717-May-12 17:35

jawadali477

17-May-12 17:35

thank you CPallini. that was really helpful.

Call control from static method

CPallini17-May-12 21:28

CPallini

17-May-12 21:28

You are welcome.

Veni, vidi, vici.

_Flaviu16-May-12 5:00

16-May-12 5:00

I have an dialog with two static methods :

C++

// MyDialog.h
static void StartSomething();
static void EndSomething();

// MyDialog.cpp
void CMyDialog::StartSomething()
{
	//
	GetDlgItem(IDOK)->EnableWindow(FALSE); // <-- disable OK button
}

void CMyDialog::EndSomething()
{
	//
	GetDlgItem(IDOK)->EnableWindow(); // <-- enable OK button
}

How can I disable/enable dialog's OK button from static dialog methods ?

Thank you.

image processing toolkits | batch image processing

C^hris L^osinger16-May-12 5:18

C^hris L^osinger

16-May-12 5:18

you will have to find a way to give the static methods a 'this' pointer for the dialog you want to control, or the HWND of the dlg.

enhzflep16-May-12 6:17

16-May-12 6:17

When I've used class objects to represent windows in the past, that's just what I've done.

The way I implemented it was to use the following 3 lines of code:

C++

SetWindowLong(mHwnd, GWL_USERDATA, (long)((void*)this));
mOldWndProc = (WNDPROC)GetWindowLong(mHwnd, GWL_WNDPROC);

SetWindowLong(mHwnd, GWL_WNDPROC, (long)stWinMsgHandler);

This allows the static method stWinMsgHandler to obtain the correct instance of the class that's being used to handle a particular window, as below:

C++

LRESULT CALLBACK cStaticLink::stWinMsgHandler(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    cStaticLink *pWnd;

    // get the pointer to the window
    pWnd = (cStaticLink*)GetWindowLong(hwnd, GWL_USERDATA);

    // if we have the pointer, go to the message handler of the window
    // else, use DefWindowProc
    if (pWnd)
        return pWnd->WndProc(hwnd, uMsg, wParam, lParam);
    else
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

_Flaviu16-May-12 19:11

16-May-12 19:11

Thank you all, I solve my problem, you are very kind. Got my 5 all of you !!!

_Flaviu16-May-12 7:37

16-May-12 7:37

Sound good, but can you tell me how to use 'this' pointer or HWND to access OK button ?

image processing toolkits | batch image processing

C^hris L^osinger16-May-12 7:43

C^hris L^osinger

16-May-12 7:43

once you have a pointer to the dialog:

dlg->GetDlgItem(IDOK)->EnableWindow(FALSE);

Richard MacCutchan16-May-12 21:09

Richard MacCutchan

16-May-12 21:09

Why are you using static functions for non-static actions?

Programming is work, it isn't finger painting. Luc Pattyn

_Flaviu17-May-12 20:34

17-May-12 20:34

Those static functions setup something into a listcontrol, and while this listctrl is in edit mode, I want to block user to end the dialog with unfinished values ...

Sending Data to Excel with C++

Richard MacCutchan17-May-12 22:17

Richard MacCutchan

17-May-12 22:17

You don't need static functions to do that.

Programming is work, it isn't finger painting. Luc Pattyn

keane209716-May-12 4:47

keane2097

16-May-12 4:47

Hi folks,

I'm working on a program that reads a text file which has columns of dates, times and associated values, then sends the columns to an excel sheet. The entire file follows the same pattern.

Text file sample (there's a total of 21 columns, I've deleted some to make it look less messy):

2012-05-14 14:08:12.498 8 InfoMSG1   N  2.719   2994   2153   2089 {InfoMSG2}
2012-08-14 14:08:38.644 8 InfoMSG3 N  2.974  6.732  9.577 10.596 {InfoMSG4}

At the moment, I'm using a fairly inelegant solution of breaking each sentence into tokens delimited by whitespace and storing each column in a separate array as follows:

C++

string			line;
string			*col1, *col2, *col4, *col5, *col21;		

        col1 = new string[fileLength];
	col2 = new string[fileLength];
	col4 = new string[fileLength];
	col5 = new string[fileLength];
	col21 = new string[fileLength];

while(getline(file, line))
	{
std::stringstream	linestream(line);
				
//Reading space separated columns into string arrays
linestream >> col1[i] >> col2[i] >> col3[i] >> col4[i] >> col5[i] >> col6[i] >> col7[i] >> col8[i] >> col9[i] >> col10[i] >> col11[i];

linestream >> col11[i] >> col13[i] >> col14[i] >> col15[i] >> col16[i] >> col17[i] >> col18[i] >> col19[i] >> col20[i] >> col21[i];

i++;
	}

In my research of the COM interface process from C++ to Excel I haven't been able to find a method of passing single byte strings to excel. The only method I've been able to have any success with is detailed in this MSDN article -

HTML

http://support.microsoft.com/kb/216686

It uses a VARIANT safearray to pass data to Excel, and the only way I can see to use my arrays as above is to convert the std::strings in each element first to wstrings, then to BSTR.

I would think there's probably a better way to do this conversion but haven't come up with one.

Anyway, my conversion form single byte to wide string is achieved using the following function:

C++

wstring stws(const string &src_string)
{
	size_t src_len = src_string.length();

	if(0 == src_len)
		return L"";

	wchar_t *buf = new(std::nothrow) wchar_t[src_len + 1];

	if(0 == buf)
		return L"";

	mbstowcs(buf, src_string.c_str(), src_len);
	buf[src_len] = L'\0';

	wstring final_string = buf;

	if(0 != buf)
		delete [] buf;

	return final_string;
}

The further conversion from wide string to BSTR is carried out like so:

C++

	wcol1 = new wstring[fileLength];
	wcol2 = new wstring[fileLength];
	wcol4 = new wstring[fileLength];
	wcol5 = new wstring[fileLength];
	wcol21 = new wstring[fileLength];

	bcol1 = new BSTR[fileLength];
	bcol2 = new BSTR[fileLength];
	bcol4 = new BSTR[fileLength];
	bcol5 = new BSTR[fileLength];
	bcol21 = new BSTR[fileLength];

for(int i=0; i<10; i++)
	{
		wcol1[i] = stws(col1[i]);
		wcol2[i] = stws(col2[i]);
		wcol4[i] = stws(col4[i]);
		wcol5[i] = stws(col5[i]);
		wcol21[i] = stws(col21[i]);

		bcol1[i] = SysAllocString(wcol1[i].c_str());
		bcol2[i] = SysAllocString(wcol1[i].c_str());
		bcol4[i] = SysAllocString(wcol1[i].c_str());
		bcol5[i] = SysAllocString(wcol1[i].c_str());
		bcol21[i] = SysAllocString(wcol1[i].c_str());
	}

I've printed the BSTR values to the console using wcout to confirm that they are correct.

Now, to pass this data into an excel sheet. I'm using the method outlined in the MSDN article linked above, creating a safe array with my list of values from the BSTR arrays:

C++

// Create a safearray of variants...
	VARIANT arr;
	arr.vt = VT_ARRAY | VT_VARIANT;
	{
		SAFEARRAYBOUND sab[2];
		sab[0].lLbound = 1; sab[0].cElements = 10;
		sab[1].lLbound = 1; sab[1].cElements = 1;
		arr.parray = SafeArrayCreate(VT_VARIANT, 2, sab);
	}

// Fill safearray with some values...
	for(int i=0; i<10; i++) {
		for(int j=0; j<2; j++) {
			// Create entry value for (i,j)
			VARIANT tmp;
			tmp.vt = VT_BSTR;
			tmp.bstrVal = bcol2[i];
			// Add to safearray...
			long indices[] = {i,j};
			SafeArrayPutElement(arr.parray, indices, (void *)&tmp);
		}
	}

Then I do the usual COM tasks, creating a new Workbook, acquiring the Active Worksheet, getting a range object, before setting the values in the range as follows:

C++

// Set range with our safearray...
	AutoWrap(DISPATCH_PROPERTYPUT, NULL, pXlRange, L"Value", 1, arr);

For the scenario described above, where I only copy a single column to excel at a time, what I have does the trick.

My major problem at this stage is finding a way to loop in the two dimensions of the safearray to copy the rest of the columns at the same time. I know I can do it by creating a safearray for each column following a similarly inelegant approach to how I dealt with splitting the data into columns in the first place, but I'm sure there's a better way to do it than that.

Any help would be greatly appreciated, ty.

David Crow16-May-12 7:21

David Crow

16-May-12 7:21

keane2097 wrote:
Anyway, my conversion form single byte to wide string is achieved using the following function:

Would A2W() be of any help?

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keane209716-May-12 8:04

keane2097

16-May-12 8:04

Hi David, I'm away from my computer now so can't check, but I'm guessing the A2W() function carries out the single-byte to wide conversion for me?

If so it will be a help by replacing my own function with a presumably more well tested one so thanks for that.

I'm going to hold out hope that it does the entire conversion to BSTR until I can disprove the theory which will also improve my mood for a couple of hours at least so thanks for that too Poke tongue | ;-P

enhzflep16-May-12 7:50

16-May-12 7:50

I've done something similar to this a couple of years back. In my case I was doing it from VBA, though (I guess) it shouldn't matter.

I was able to fill the cells in a range with the values contained in a 2D array.
So, rather than 1 call per column it was 1 call for the whole lot.

I'll have a poke around in the morning and see if I still have a copy of the code lying around. (I may very well not, since it was for a project at an old job)

Fantastically articulate post btw. Thumbs Up | :thumbsup:

keane209716-May-12 8:05

keane2097

16-May-12 8:05

Ha! Thanks for the compliment Big Grin | :-D

If you do manage to dig out that old code I'd be much obliged, thanks.

enhzflep16-May-12 8:21

16-May-12 8:21

Pleasure. It's unfriendly to bash the inept - but there's nothing wrong with complimenting those at the opposite end of the spectrum, methinks!

Can't be bothered to find the old code (Gawd knows how many gigs of data I'd have to sift through)
BUT, I can offer you some brand-new freshly written code Smile | :)

Here's something that fills in 100 (iSize*iSize cells) in 1 fell swoop.

Sub test1()
    Const iSize = 10
    Dim myArray(1 To iSize, 1 To iSize)
    Dim iRow As Integer, iCol As Integer

    iRow = 1
    For iCol = 1 To iSize
        myArray(iRow, iCol) = "Column " + CStr(iCol)
    Next iCol

    curCellNum = 1
    For iRow = 2 To iSize
        For iCol = 1 To iSize
            myArray(iRow, iCol) = curCellNum
            curCellNum = curCellNum + 1
        Next iCol
    Next iRow

    ' next two statements are equivalent (when iSize is 10)
    Cells.Range(Cells(1, 1), Cells(iSize, iSize)) = myArray
    'Cells.Range("A1", "J10") = myArray
End Sub

Hope that's of some use. Thumbs Up | :thumbsup:

enhzflep28-May-12 3:31

MFC client view rectangle size?

28-May-12 3:31

You may wish to see Solution 3 here Convert integer to Excel range

Vaclav_16-May-12 4:42

Vaclav_

16-May-12 4:42

After “doing” MFC for eternity, I finally got puzzled by this.
Using basic MFC wizard to create application I see that the client rectangle of the default view is not the actual size of the rectangle on the screen. It is much smaller.
All the documentation I have ever read on the suject describe the view client are as the entire screen.
So why does GetClientRect comes up with lesser top/ bottom values?
Thanks for reading
Vaclav

Re: MFC client view rectangle size?

_Flaviu16-May-12 5:11

Re: MFC client view rectangle size?

16-May-12 5:11

Starting view in maximize way could be an solution ? If not, you can call ResizeParentToFit(...) in CScrollView::OnInitialUpdate() ...

Vaclav_16-May-12 5:55

Vaclav_

16-May-12 5:55

CScrollView::OnInitialUpdate() ... works only in scroll view. I have tried that in plain CView derivative. VC complier said so.

As far as starting maximized – that was not the question. I said using wizard created default view.
Sorry.

Re: MFC client view rectangle size?

_Flaviu16-May-12 7:40