PCHAR question

[Gizzeta]

Hi
I would like to do an object whit N out.
To do this I define the number of output in the .h like this

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#define NUM_OF_OUT 24

then I allocate an array of TEVT*

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TEVT*	pOut[NUM_OF_OUT];

in the .cpp I write

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void GetParamInfo (void* pModule,int n, TParamInfo* pParamInfo) {
	if&#40;n < NUM_OF_OUT&#41;&#123;
		pParamInfo->ParamType		= ptArray;
		pParamInfo->Caption			= "Out";
		pParamInfo->IsInput			= false;
		pParamInfo->IsOutput		= true;
	&#125;

and

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void SetEventAddress (void* pModule, int n, TEVT* pEvent) {
	TMyModule* pMyModule = ((TMyModule*)pModule);
	if&#40;n < NUM_OF_OUT&#41;&#123;
		pMyModule->pOut&#91;n&#93;   = pEvent;
	&#125;

it works, no problem.

Now I would like to change the Caption of each out like this: Out1, Out2, ..., Out24.
How can I do it?
pParamInfo->Caption is a PCHAR type, how can I manipulate a string like this?

Thanks for help

[martignasse]

Hi Gizzeta,

PCHAR is a plain old pointer to char (char*)

so you can do something like this :

in your module class member definition

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PCHAR OutNames[NUM_OF_OUT];

in your module constructor

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for &#40;int n=0;  n < NUM_OF_OUT; n++&#41;
&#123; 
    OutNames&#91;n&#93; = new char&#91;STRING_BUFF_SIZE&#93;;
    sprintf_s&#40; OutNames&#91;n&#93;, STRING_BUFF_SIZE, "Out%i", &#40;n +1&#41;&#41;;
&#125;

in GetParamInfo

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void GetParamInfo (void* pModule,int n, TParamInfo* pParamInfo)
{

	if&#40;n < NUM_OF_OUT&#41;
	&#123;        
        pParamInfo->ParamType   = ptArray;
        pParamInfo->Caption     = &#40;&#40;YourModule*&#41;pModule&#41;->OutNames&#91;n&#93;;
        pParamInfo->IsInput     = false;
        pParamInfo->IsOutput    = true;
	&#125;
&#125;

in your module destructor

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for &#40;int n=0;  n < NUM_OF_OUT; n++&#41;
&#123;        
    if &#40;OutNames&#91;n&#93; != NULL&#41;
    &#123;
        delete&#91;&#93; OutNames&#91;n&#93;;
    &#125;
&#125;

not tested, but it should do the trick

[martignasse]

or even more simpler/safer with the use of the STL

in yourmodule.h

add includes

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#include <string>
#include <vector>

and a vector in your module class

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class TYourModule : public TUserModule
{
    ...
    std&#58;&#58;vector<std&#58;&#58;string> m_vectOutCaptions;
    ...
&#125;

in yourmodule.cpp

add includes and namespace use

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#include <string>
#include <sstream>
#include <vector>

using namespace std;

and in GetParamInfo()

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void GetParamInfo (void* pModule,int n, TParamInfo* pParamInfo)
{
    // make convenient pointer to the module
    TYourModule* pYourModule = ((TYourModule*)pModule);
        
    // the param name
    stringstream Stream; 
    Stream << &#40;n + 1&#41;;
    pYourModule ->m_vectOutCaptions.push_back&#40;string&#40;"Out "&#41; + Stream.str&#40;&#41;&#41;;

    if&#40;n < NUM_OF_OUT&#41;
    &#123;        
        pParamInfo->ParamType   = ptArray;
        pParamInfo->Caption     = &#40;PCHAR&#41;&#40;pYourModule ->m_vectOutCaptions&#91;n&#93;.c_str&#40;&#41;&#41;;
        pParamInfo->IsInput     = false;
        pParamInfo->IsOutput    = true;
    &#125;
&#125;

[Gizzeta]

It Works,
Thanks!

[anbd]

Thanks