Does anyone know any function in VC++ that can let me access or read or write data from or to COM port??

I know I can use GetDocument->UpdateAllViews(0) to clear the screen in VIEW.CPP ..... but how can i clear the screen if my function is located in another non-MFC file??????? I just use something liked ::InvalidateRect(Handler, NULL, FALSE); to update the view..... Can you help me???? What i want to do is keep printing a list of number.....for example, 1 2 3 4 5 6 7 and the program has to compare the previous number....if the previous number is 7...then I have to erase the 7 and put an A there......but I have to display "7" first...then when it's going to display another .....let say 8....then the list should be 1 2 3 4 5 6 A 8

When i use this code to save the result to a char, char Buffer[128]; sprintf(Buffer, " %f %f", a,b); my program is forced to terminate....why?

Oh thanks!!!! It works now... but i have one more question. For example, a = 180.98763 I just want to display 180.99....and save it to a char or CString because i want to save to my CStringList........what can i do??? can i use: char Buffer[128]; sprintf(Buffer, " %f %f", a,b); I have a and b......I want to display liked: | 180.98 | 123.56 | ??????

Here is the codes float a,b; a = (( (AlphaTotal - PrevAlphaTotal) / PrevAlphaTotal ) * 100 ); b = (( (BetaTotal - PrevBetaTotal ) / PrevBetaTotal ) * 100 ); CString testing; CStringList ReturnedData; testing.Format("Alpha Percentage %f", a ); ReturnedData.AddTail(testing); testing.Format("Beta Percentage %f", b ); ReturnedData.AddTail(testing); (--->ReturnedData will be used to output in view class) The results would be: If a or b = 65.50...it displays 0.00 If a or b = 180.50...it displays 100.00 Why i know that because.....I try just type some number in the formula...for example, a = ((700-500)/500)*100; b = ((81-60)/60)*100; Then output is: Alpha Percentage 0.00 Beta Percentage 0.00 How to fix it?????????????????????? ;P

:-D :-D :-D :-D :-D :-D You guys are great!!!!!!! :laugh: :laugh: :laugh: :laugh: :laugh: :laugh:

Actually, I'm looking for a infinite size of "array", so I want to see if i can use pointer to do that.......sometimes i need 10....but sometimes i need 40......that's why i create pointer..... Do you know how?

Oh.....i understand that now......let me try.... Thanks, Tomaxz....... THANK YOU THANK YOU THANK YOU!!!!!;P

CDC* CDCPoint is a global variable for another files in the project. But pDC is just using in OnDraw(). Therefore, CDCPoint and pDC are the same but used in different area.

My program doesn't have CreatCompatibleBitmap...something liked that.....i just have in OnDraw(CDC* pDC): if(CDCPoint==NULL) { CDCPoint=new CDC; } CDCPoint->m_hDC=pDC->m_hDC; CDCPoint->m_hAttribDC=pDC->m_hAttribDC; //creating a global window handler to help with output Handler=m_hWnd; //setting background mode so there wouldn't be a border around text (just in case) pDC->SetBkMode(TRANSPARENT); //setting fixed width font CFont newFont; newFont.CreateFont(18, 9, 0, 0, FW_REGULAR, 0, 0, 0, ANSI_CHARSET, OUT_DEVICE_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_MODERN, "Courier New"); pDC->SelectObject(&newFont); Also, I found that there is another problem........normally the output font is Courier New....but suddently....all fonts change to another one....including all message box. Thanks for your help anyway... :) :)

My code : CPen penObject; penObject.CreatePen(PS_SOLID, 4, RGB(255,0,0)); CDCPoint->SelectObject(&penObject); CDCPoint->MoveTo(100,100); CDCPoint->LineTo(100,200); Why the line is in colour BLACK instead of RED?????? Also, when i put: CDCPoint->MoveTo(100,100); CDCPoint->LineTo(100,100); It cannot print a dot. It prints nothing.....do you know why???? :eek:

Here is my code... CPen pen, pen1, pen2; pen.CreatePen(PS_SOLID, 2, WHITE); CDCPointer->SelectObject(&pen); ..* ..* ..* pen1.CreatePen(PS_SOLID, 2, BLACK); CDCPointer->SelectObject(&pen1); ..* ..* ..* pen2.CreatePen(PS_SOLID, 2, RED); CDCPointer->SelectObject(&pen2); ..* ..* ..* When i compile it....there is an error message on the line of pen1.CreatePen.. "error C2668: 'CreatePen' :ambiguous call to overloaded functinn" What is it?

i'm trying to use SetScrollSizes() and ScrollToPosition() in my program. I've put #include in my program. However, the debugger still keep saying "undeclared identifier". What happen?????? X| p.s.: again....it works in my previous program....i just copy the code to my new program....

Hi Tomasz, Thanks for your quick response!!! You are superb!!!!! ;) :) ;P :-D :rolleyes: :-O :cool: :suss: :eek: Richard

i have two C files and want to add to my new project. I've used these files in MFC programming before and everything fines. However, this time when i compiled these files, i got the following error message: "fatal error C1010: unexpected end of file while looking for precompiled header directive" I didn't change anything.......then i tried to just compile the file (this lead me to create a new project).....i used the same directory...same location...nothing change.......and it works!!!!!!!!!! Does anyone know what happeneD? :confused:

Does anyone know how to put an input box or dragdown menu on the toolbar???? I want to let someone to choose from the menu or type the command directly in the input textbox.

Thanks for your reply. I know I can use NM_CLICK, but I don't know which function in CTreeCtrl i should use. Seems liked they just return a HTREEITEM variable. The following is how i make a tree: HTREEITEM ABC, XYZ, node; ABC = m_Tree.InsertItem("ABC", TVI_ROOT); node = m_Tree.InsertItem("A", ABC); node = m_Tree.InsertItem("B", ABC); ...etc... if I want to choose B...but it returns a HTREEITEM....how can i know which "node"....

Does anyone know how to open a *.doc file with launching the MS WORD?

I have the following tree: .ABC .|_A .|_B .|_C .XYZ .|_X ...|_XX .|_Y .|_Z I want to display something when i use a mouse to click on particular item. How to do that? For example, if I highlight XX, then pop up a message box say "XX"....etc... Thanks

This one is really good.....try it..... http://devcentral.iftech.com/learning/tutorials/submfc.asp