C / C++ / MFC

14-Jul-08 8:24

I am trying to write out an array and all I am getting is junk in the file.

Here's the code:

short frameData[3648];
short *p;
file.Open( "C:\\test.txt",  CFile::modeCreate|CFile:: modeReadWrite);
p = (short *)Frameptr;
for ( int i=0; i<= 3647; i++)
{
    frameData[i] = *p;
    p++;
}
//write out data
file.Write(frameData,sizeof(short)*3647);
file.Close();

modified on Monday, July 14, 2008 2:34 PM

David Crow14-Jul-08 8:30

David Crow

14-Jul-08 8:30

aei_totten wrote:
...all I am getting is junk in the file.

How are you verifying this? What should be in the file?

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

aei_totten14-Jul-08 8:34

14-Jul-08 8:34

I open the file and there are a bunch of weird chars, boxes, greek letters, etc. and the data is an array of numbers in the 646-780 range. I step through with the debugger and the array is populated fine.

Cedric Moonen14-Jul-08 8:36

Cedric Moonen

14-Jul-08 8:36

Well, you asked to write the array as a binary format into the file, so each short from your array will be writte as two bytes in the file (thus resulting in garbage characters). You first have to convert each short into a string and write that string into the file.

Cédric Moonen
Software developer

Charting control [v1.4]
OpenGL game tutorial in C++

aei_totten14-Jul-08 8:45

14-Jul-08 8:45

Thanks that was it, duh.

led mike14-Jul-08 8:57

14-Jul-08 8:57

aei_totten wrote:
Thanks that was it, duh.

Yeah, imagine that! The file had in it what you told the computer to put in it! Wow, what will they think of next?

led mike

Mark Salsbery14-Jul-08 9:29

Mark Salsbery

14-Jul-08 9:29

led mike wrote:
Wow, what will they think of next?

This![^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

led mike14-Jul-08 9:54

14-Jul-08 9:54

Sure but I like to pronounce that Shamoo Wink | ;)

Have you tried one? Does it really work? Or is it a misinfomercial? Laugh | :laugh:

led mike

Mark Salsbery14-Jul-08 9:57

Mark Salsbery

14-Jul-08 9:57

led mike wrote:
Does it really work?

Works great on the commercial! I haven't tried one though.

German technology - it HAS to be good!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

led mike14-Jul-08 11:16

14-Jul-08 11:16

Mark Salsbery wrote:
German technology - it HAS to be good!

Yep[^]

Two and a half years ago, the bursting of the dot-com bubble erased most of the market value of Germany's technology sector. Now, the market itself is being scrapped.

Deutsche Börse, which runs the Frankfurt stock exchange, announced today that it would close the Neuer Markt -- the technology-related market that is Germany's answer to the Nasdaq -- by the end of 2003.

led mike

aei_totten14-Jul-08 8:37

14-Jul-08 8:37

and for some reason it isn't posting a less than or equal to in my loop, I even tried to go back and edit it with no luck.

aei_totten14-Jul-08 9:27

14-Jul-08 9:27

Okay new problem.
I decided to write the file each element at a time.
Here is the new bit of code...

for ( int i=0; i<= 3647; i++)
{
    frameData[i] = *p;
    temp.Format("%d ",frameData[i]);
    file.Write(temp,sizeof(temp));
    p++;
}

but instead of getting each number followed by a blank which is what I had intended. I get some of the numbers on top of each other (like four in a row) and some of them correct.

aei_totten14-Jul-08 9:29

14-Jul-08 9:29

oh yeah temp is a CString

Mark Salsbery14-Jul-08 9:52

Mark Salsbery

14-Jul-08 9:52

for ( int i=0; i <= 3647; i++ ) 
{
   frameData[i] = *p; 			
//   temp.Format("%d ",frameData[i]); <-- Wrong format specifier for short int
   temp.Format("%hd ",frameData[i]);
//   file.Write(temp,sizeof(temp)); <-- Wrong string length
   file.Write(temp, temp.GetLength() * sizeof(TCHAR));
   p++;
}

If you're writing all text, maybe CStdioFile is a better class to use...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

aei_totten14-Jul-08 10:30

14-Jul-08 10:30

Thanks so much. I can't believe how much c++/mfc I had forgotten since switching to C sharp and Java. But somethings you just can't beat in c++. Big Grin | :-D

led mike14-Jul-08 11:11

Help PenTable (Diy) Pressure data.

14-Jul-08 11:11

aei_totten wrote:
But somethings you just can't beat in c++.

You can beat a fish.

led mike

motivinteractive14-Jul-08 6:58

motivinteractive

14-Jul-08 6:58

Hello everyone!

I have built a digital table with a pencil (like a wacom) and I'm doing my own drivers.
He managed to move the mouse through the following simple code [Visual C + + in XP]:

// press detected
INPUT aInput;
aInput.type = INPUT_MOUSE;
aInput.mi.dwFlags = MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE;
aInput.mi.dwExtraInfo = 0;
aInput.mi.mouseData = 0;
aInput.mi.time = 0;
aInput.mi.dx = (data.X * 65535.0f);
aInput.mi.dy = (data.Y * 65535.0f);
int aResult = SendInput(1, &aInput, sizeof(INPUT) );

But, I do not see how you can send to the system/software (Photoshop, paint ,...) data with the pressure of the pen to draw. I suppose that will be a standar, but nothing found information about it.

Someone known as is done? That object is used?

Thanks!!

Re: Help PenTable (Diy) Pressure data.

led mike14-Jul-08 8:55

Mouse events for Bitmapbutton

14-Jul-08 8:55

motivinteractive wrote:
But, I do not see how you can send to the system/software (Photoshop, paint ,...) data with the pressure of the pen to draw. I suppose that will be a standar,

I think you are looking for the Wintab specification for drivers.

http://www.smartcomputing.com/editorial/article.asp?article=articles/archive/r0403/06r03/06r03.asp&guid=[^]

Software. Without appropriate software support, no peripheral can communicate with the computer. In the case of digital tablets, this means each program must support the tablet with an API (Application Program Interface), and each tablet must include a software driver.

The application developer is responsible for implementing the AP correctly. Wintab is the most popular tablet API in use. Developers can add the Wintab API to their application and support almost any tablet on the market today. API's are often specific to a category, such as tablets, but are not device specific. (For more information, see "Programming Foundations" in this issue.)

Software drivers, on the other hand, are device specific. Each device has different features and speaks a slightly different language. Each driver is written for a specific tablet and translates the tablet's language into something Wintab can understand. This lets developers implement support for a wide range of tablets without having to write support for several different devices.

led mike

bhanu_850914-Jul-08 5:10

bhanu_8509

14-Jul-08 5:10

Hello all,

I want to change the bitmap for the mouseover, mouseup and mousedown events in the CBitmapbutton. Please guide me.

Kind regards,
Banu

Re: Mouse events for Bitmapbutton

led mike14-Jul-08 5:35