C / C++ / MFC

30-Jun-03 7:52

I am trying to create an array of structures (struct TSimSignal) that are of the size of SignalCount in the TSimHeader struct

Below is the structure that I have created:

<br />
struct TSimSignal<br />
	{<br />
		<br />
		double Value[45];<br />
		int SimWriteFlag;<br />
		int data_index;<br />
		int DisplayReadFlag;<br />
		long TimeStamp;<br />
	<br />
	};<br />
<br />
<br />
 struct TSimHeader<br />
	{<br />
		char   *Name[45];<br />
		char   *Unit[45];<br />
		double  Min[45];	  <br />
		double  Max[45];					<br />
		int SignalCount;		<br />
		int SimStatus;<br />
		<br />
	};<br />
<br />
//this is what I am trying to do<br />
<br />
struct TSimSignal signal_str[TSimHeader.SignalCount];<br />
int *data_index_ptr[TSimHeader.SignalCount];<br />
double *data_ptr[TSimHeader.SignalCount];<br />
<br />

How can I create these arrays with the size of SignalCount?

I know that I have to have a const to set the size of the array, but not sure how to make the const = to SignalCount;

SignalCount is set when A file is read in. It does a count and then sets the number for SignalCount.

thanks, Smile | :)

David Crow30-Jun-03 8:22

30-Jun-03 8:22

struct TSimSignal *signal_str = new struct TSimSignal[TSimHeader.SignalCount];

int *data_index_ptr = new int[TSimHeader.SignalCount];

double *data_ptr = new double[TSimHeader.SignalCount];

Dean Goodman30-Jun-03 8:52

Dean Goodman

30-Jun-03 8:52

And don't forget to call delete on the pointers when you are done with the arrays, i.e.

delete []signal_str;
delete []data_index_ptr;
delete []data_ptr;

-Dean

johnstonsk30-Jun-03 9:13

30-Jun-03 9:13

Thanks Dean,

sj Smile | :)

johnstonsk30-Jun-03 9:21

30-Jun-03 9:21

David,
I get the same error when I try it this way.

Any ideas?

d:\....h(42) : error C2275: 'TSimHeader' : illegal use of this type as an expression
d:\....h(19) : see declaration of 'TSimHeader'

sj Confused | :confused:

johnstonsk30-Jun-03 9:26

30-Jun-03 9:26

Figured it out, I just made a pointer to the structure and accessed the data using the pointer

sj

COnvert CEdit to string

keegan30-Jun-03 7:15

30-Jun-03 7:15

Welp, i got myself in a little mess and i cant figure out how to fix it.

I want to import data from a text file, and have a string appear in an Edit Control.

Basically, the problem is this: if i define my variable of the edit contol as CEdit, it says it can't convert to string when i try to write to my file. (i have a function that accepts a string, and im passing the edit control variable into it.)

if i try to define my edit control variable as a 'variable' and make it of type CString, i get yelled at because, evidently, ifstream doesn't work properly, or the syntax im using isnt happy.

any ideas? how can i pass a CEdit or a CString variable into a function that requires a string variable?

*.*

David Crow30-Jun-03 7:25

30-Jun-03 7:25

keegan wrote:
how can i pass a CEdit or a CString variable into a function that requires a string variable?

void someFunction( LPCTSTR lpszSomeString )
{
    AfxMessageBox(lpszSomeString);
}
...
CString str = "This is some text";
someFunction(str);

keegan30-Jun-03 7:57

30-Jun-03 7:57

ok, thanks for that. it accepted passing CEdit variable into a function that takes a LPCTSTR string.

However, i still cant infile >> a LPCTSTR.

Ie, here's my code:

void function(LPCTSTR stringthing)
{
string filename = "stringdata.dat";
ifstream inFile(filename.c_str());
inFile >> stringthing;
}

this returns the error
error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'LPCTSTR' (or there is no acceptable conversion)

i tried using inFile >> into a string variable, then setting my LPCTSTR = to that string contents...but that said it cant convert.

Frown | :(

*.*

David Crow30-Jun-03 8:20

30-Jun-03 8:20

void function(LPTSTR stringthing)
{
    string filename = "stringdata.dat", str;
    ifstream inFile(filename.c_str());
    inFile >> str;
    strcpy(stringthing, str.c_str());
}

keegan30-Jun-03 9:09

30-Jun-03 9:09

thanksa again, but that code returned an erro saying i cant convert from LPCSTR to char*.

i've foudn a way (the only way that my program can be run in another area of the code) where all i have to do is return a CString. but, this takes me back to teh beginning, because i cant use infile>> for a cstring object, i cant convert a string into a cstring if i try infile >> string, and i cant convert from a string to an LPCSTR if i try inFile >> string.

buggar this is annoying. why cant i just go

CString foo;
string bar;

infile >> bar;

foo = bar;

return foo;

*.*

David Crow30-Jun-03 9:53

30-Jun-03 9:53

I don't know what it is you are trying to do, but all of my suggestions have been tried and tested with positive results. I'm sure there are better ways of accomplishing the task but these are answers to your question(s) nonetheless.

void function( LPTSTR stringthing )
{
    string filename = "stringdata.dat", str;
    ifstream inFile(filename.c_str());
    inFile >> str;
    strcpy(stringthing, str.c_str()); // this line can actually be omitted and use 'stringthing' in place of 'str' above
}

void main( void )
{
    char buf[1024];
    function(buf);
    printf("]%s[\n", buf);
}

When the answer appears to be wrong, don't discount the possibility that the wrong question was asked! - Anonymous

keegan30-Jun-03 9:58