Hello,

I have somme problems to insert in my program non windows Api.

This is the first time I do that and I'm a little lost

I'm still working with Clarion 6.3.

I used libamker to create .lib file.

I included this .lib in my project structure.

Now, I try to prototype some functions with complex structure

First problem :

typedef struct {
int version; // version of the symbol
int width; // width of the symbol
unsigned char *data; // symbol data
} QRcode;

For me it is

QRcode group,type
version long
width long
data *byte
end

But I have an error when I compile the program (*byte).

Second problem - prototyping the functions :

int CreateStaticQRCode(LPCWSTR posId, QRcode **qrCode);

LPCWSTR is CSTRING (Right ?)
I have a problem with **qrCode. I don't know what I have to write

int SaveQRCodeAsBitmap(QRcode *code, int pixelSize, LPCWSTR filePath);

Same problem with *code.

Could you help me to solve my problem.

I don't know if all of this is possible in this Clarion version.

Thank you in advance.

Paul

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On 15-Nov-18 10:36 AM, paul.blero wrote:> Hello,

I have somme problems to insert in my program non windows Api.

This is the first time I do that and I'm a little lost

I'm still working with Clarion 6.3.

I used libamker to create .lib file.

I included this .lib in my project structure.

OK, that's right so far

Now, I try to prototype some functions with complex structure

First problem :

typedef struct {
int version; // version of the symbol
int width; // width of the symbol
unsigned char *data; // symbol data
} QRcode;

For me it is

QRcode group,type
version long
width long
data *byte
end

But I have an error when I compile the program (*byte).

Yes. "unsigned char *data" is a pointer to data of type 'unsigned char'
aka byte. But CW doesn't have the concept of a data pointer type.

I have to admit I have a terrible habit of prototyping any type of
pointer as a ulong, but it works for me.

So, when you have to get creative:

QRcode group,type
version long
width long
data ulong
end

Then you have something like:

fred byte,dim(100)
code
fred = ! whatever
qrcode:data = address(fred)

Second problem - prototyping the functions :

What's the calling convention? It's not the CW internal one, it'll
either be C or Pascal
So you'll need the relevant thing on the end of your prototype

int CreateStaticQRCode(LPCWSTR posId, QRcode **qrCode);

CreateStaticQRCode(ulong,ulong),int,c
OR
CreateStaticQRCode(ulong,ulong),int,pascal

The **qrcode implies a pointer to a pointer to some data.
Which is wierd, but not entirely unheard of.
Assuming I'm right, off the top of my head it might be something like this:

fred dim,byte(100)
ptr1 ulong
ptr2 ulong
code
fred = ! whatever
ptr1 = address(fred)
ptr2 = address(ptr1)
returnedvalue = CreateStaticQRCode(100,address(ptr2))

int SaveQRCodeAsBitmap(QRcode *code, int pixelSize, LPCWSTR filePath);

Same concept:
SaveQRCodeAsBitmap(ulong,ulong,ulong),int,C

fred like(qrcode)
filename cstring(300)
code
fred = ! whatever
filename = 'c:\fred.bmp'
returnedvalue = SaveQRCodeAsBitmap(address(fred),100, address(filename))


hth,
Paul

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Hi Paul,

Very interesting your solution.

I tried it but my application crashed (unhandled win32 exception [1496])

I agree with you for the group declaration.

But I had to change your instructions a bit.

To begin, I take the first function

MAP
MODULE('QRCODE.LIB')
CreateStaticQRCode(ulong, ulong),byte,c
END
END

So, I define

fred group(QRcode)
end
ptr0 ulong
ptr1 ulong
ptr2 ulong
posId cstring(29)

In the code

posId = '2COMPANY*0C123456789F12345678'

ptr0 = address(posid)
ptr1 = address(fred)
ptr2 = address(ptr1)
returnvalue = CreateStaticQRCode(address(ptr0),address(ptr2))

But the application crashed.

I have tried with C or Pascal => same result.

Some informations about my application.

ABC Template.

Dictionnay in an app (dll)
programs in several apps (others dlls)
Main program in a separate app (exe)

The dll in which I have added the instructions is called edition.app

The procedure where I added the api definitions named PrintInvoice.

I added the qrcode.lib in Project Editor / Library, Object and ressourcs file (in this app).

Is that correct?

The qrcode.dll file is in the same directory.

How does the program make the connection between the 2 files?

Maybe I forgot something?

Thank you for your help.

Paul

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Hi, Paul

I found how to access to the apis.

I had to put my module in the global map of my application.

Next step : to create qrcode without error.

Thank you for your help.

Paul

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