C / C++ / MFC Discussion Boards

Re: why the function GetMethodID in JNI always return 0?

Richard MacCutchan11-Dec-09 6:19

11-Dec-09 6:19

I have tried this and, without seeing all your code, have made a few educated guesses. In my tests I am able to get the mid for both methods and also to call those methods. Have you run this through the C debugger to verify that all other values are correct?

Drawing in a PDF file with HPDF

softwaremonkey10-Dec-09 11:20

softwaremonkey

10-Dec-09 11:20

Hi,

I have a chart object which draws itself on a DC. I would like to be able to 'print' the chart to a PDF file using the excellent Haru HPDF library. Has anyone any suggestions on how I could do this?

I guess I could add a draw function to my class which takes a pdf page instead of a DC but is there an easier way?

Smile | :)

Tony

Re: Drawing in a PDF file with HPDF

Adam Roderick J10-Dec-09 17:11

Adam Roderick J

10-Dec-09 17:11

I think Haru PDF lib has some examples codes with it. Did you checked that.
I liked HPDF lib very useful and simple.
Smile | :)

Величие не Бога может быть недооценена.

Re: Drawing in a PDF file with HPDF

softwaremonkey11-Dec-09 3:39

softwaremonkey

11-Dec-09 3:39

Hi,

Thanks for the reply. I did look through the code examples but couldnt find anything which would give me a device context to draw on. Which example did you have in mind?

I thought I might be able to create a DC, draw on it, then copy the DC to a bitmap but HPDF doesnt appear to support bitmap format.

Maybe I could write a HPDF_DC class which provides the methods of the CDC class but transforms them into a HPDF_Page but that is a big job - some other time maybe. Wink | ;)

Anyone have any easy solutions?

Thanks

Tony

Calling third party dll Canadidate function not accessible

shivels10-Dec-09 10:30

shivels

10-Dec-09 10:30

Hi,

This is my first post on these fourms, so I'll probably screw up something!
Anyway, I'm trying to write a program which interfaces with a third party dll. All I have is the dll. The dll contains a typelib. To start with, I created a Win Console32 app and am compiling using the /CLR trigger. I added the dll as a reference and placed it in the same folder. I can use intelisense to see all of the classes and interfaces. Here is my code:

// COM Test for C++ for real.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "objbase.h"

using namespace xTInstrument;

int _tmain(int argc, _TCHAR* argv[])
{

	//This code complies, but fails at runtime due to an object reference
        //not set to an instance of   an object
	//xTInstrument::IonBeamClass^ ibeam;
	//ibeam->HV->Value = 4;


	//This will generates a compile error "candidate Function(s) not accessible"
	xTInstrument::GisClass^ Gis = gcnew xTInstrument::GisClass(); 
	//Gis->InsertRetractedGISPorts(true); 
	

	return 0;
}

I know for a fact the functions are declared as "Friend" in the orginal dll. The dll I am using is the Interop created by Visual Studio. Can anybody help me?

Cheers,
Shivels

Re: Calling third party dll Canadidate function not accessible

Nemanja Trifunovic10-Dec-09 11:34

Nemanja Trifunovic

10-Dec-09 11:34

That's C++/CLI, not C++. Maybe you could get an answer if you ask it in the C++/CLI forum[^]

utf8-cpp

Re: Calling third party dll Canadidate function not accessible

KarstenK10-Dec-09 21:57

KarstenK

10-Dec-09 21:57

with the statement

#import "XYZ.dll"

you get the tlb imported.

Press F1 for help or google it.
Greetings from Germany

Re: Calling third party dll Canadidate function not accessible

shivels11-Dec-09 2:54

shivels

11-Dec-09 2:54

Hi,

I tried using
#import "libxtinstrument.dll" no_namespace rename("Getbject", "xtGetObject")
but when I do, I get 300 errors all of the same 3 types:

error C2504:'XYZ' base class undefined
error C2146: syntax error : missing ';' before identifier 'XYZ'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

Without have .h or .lib file, how can I fix these errors?

Re: Calling third party dll Canadidate function not accessible

KarstenK11-Dec-09 3:17

KarstenK

11-Dec-09 3:17

is it only a typo "GetObjecT"

#import "libxtinstrument.dll" no_namespace rename("Getbject", "xtGetObject")

the XYZ class will you need. Google for it Sleepy | :zzz:

Press F1 for help or google it.
Greetings from Germany

Re: Calling third party dll Canadidate function not accessible

shivels11-Dec-09 9:22

shivels

11-Dec-09 9:22

I was able to call the functions stored in the dll, but the program keeps failing. Turns out the Class I am trying to call is a "non-creatable" class. How can I find the main "factory" of these classes using ole/com object viewer?

Re: Calling third party dll Canadidate function not accessible

KarstenK13-Dec-09 21:13

KarstenK

13-Dec-09 21:13

Search in the Registry for the GUIDs of the classes Cool | :cool:

Press F1 for help or google it.
Greetings from Germany

Re: Calling third party dll Canadidate function not accessible

shivels14-Dec-09 5:26

shivels

14-Dec-09 5:26

Hi, the GUIDS don't show up in the regisrty. Using OLE/COM viewer, the typelib lists the classes as "coclass non-creatable" This looks like the factory model design. Is there a way to locate the "factory" which is responsible for creating the objects?

Preventing Windows messages from popping up

dipuks10-Dec-09 9:07

dipuks

10-Dec-09 9:07

Hey

I am working on a Windows application using Win32 API's and this application
has got its own formatted Error messages and so we want to prevent any generic
Windows messages to pop up.

It was found that in certain extreme or rare conditions its does pop up
the Windows messages.

Is there a way to completely suppress the Windows error messages?

Thanks in advance

Re: Preventing Windows messages from popping up

Cedric Moonen10-Dec-09 9:29

Cedric Moonen

10-Dec-09 9:29

Which error messqge ? You mean that your program crashes and thus displays an error ? I think in that case fixing your application is probably your best option Big Grin | :-D

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: Preventing Windows messages from popping up

dipuks10-Dec-09 10:06

dipuks

10-Dec-09 10:06

It's not an application crash message.

The couple of error messages that are being seen are
"Delayed Write Failed" & "Invalid Date & Time".

Anyway to supress these and other probbale Windows messages?

Re: Preventing Windows messages from popping up

22491710-Dec-09 16:22

224917

10-Dec-09 16:22

After the error dialog, does your application continue to run? And do you know which is the API call that is causing this error?

Suhredayan

What am I Doing? class < class > ???

Joschwenk66610-Dec-09 7:40

Joschwenk666

10-Dec-09 7:40

Hallo Code Project Members,

I`m Using Visual C++ 6 with Prof-Uis. From Prof-Uis tutorials I declared a class like this:

class CMyClass : public CExtNCW < CExtResizableDialog >

It works fine, but I don`t know what I`m doing. Why do I derive CMyClass from 2 classes? What is the difference between

public CExtResizableDialog

and

public CExtNCW &lt; CExtResizableDialog &gt;

Because I don`t know what this kind of Deriving is called, it is difficult to find tutorials about it..

Thank you for your answers!

Re: What am I Doing? class < class > ???

«_Superman_»10-Dec-09 7:48

«_Superman_»

10-Dec-09 7:48

CExtNCW is a template class.
Read more about it here - C++ Class Templates[^]
There are several template libraries available like ATL, STL etc.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Re: What am I Doing? class < class > ???

Cedric Moonen10-Dec-09 7:50

Cedric Moonen

10-Dec-09 7:50

CExtNCW is a template class and CExtResizableDialog is the template parameter. You are only inheriting from one class (the CExtNCW class) but as this class is a template class, you have to specify it's template parameter. I suggest you google for templates in C++ because you first need to understand how it works before being able to understand what the code means.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Doxygen Command Help Required

Steve Thresher10-Dec-09 4:34

Steve Thresher

10-Dec-09 4:34

Anyone now how to emebed tags in Doxygen help eg.

////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>Save XML File</summary>
///
/// <remarks>The XML file generated will have the following layout:
///
/// <results>
/// <count>99</count>
/// </results>
///
/// </remarks>
///
////////////////////////////////////////////////////////////////////////////////////////////////////

I've tried <pre>, <code>, <c> and <example> and none of them stop me from getting the following warning:

warning: Warning: Unsupported xml/html tag <results> not found
warning: Warning: Unsupported xml/html tag <count> not found
warning: Warning: Unsupported xml/html tag </count> not found
warning: Warning: Unsupported xml/html tag </results> not found

AxisFirst For Business

Re: Doxygen Command Help Required

Richard MacCutchan10-Dec-09 4:42

Richard MacCutchan

10-Dec-09 4:42

According to the list here[^] <results> and <count> are not supported. Broadly speaking as was shown by the error messages above.

Re: Doxygen Command Help Required

Steve Thresher10-Dec-09 4:55

Steve Thresher

10-Dec-09 4:55

You've not understood what I'm trying to acheive. I'm trying to document the layout of the XML file generated by a function which means I need to instruct Doxygen to ignore a block of text by placing it inside a given tag. The problem is I can't find the right tag.

Re: Doxygen Command Help Required

Richard MacCutchan10-Dec-09 5:20

Richard MacCutchan

10-Dec-09 5:20

Sorry, I missed that. It's a long time since I've used doxygen and I don't recall needing to do this.

Re: Doxygen Command Help Required

PJ Arends10-Dec-09 5:39

PJ Arends

10-Dec-09 5:39

Have you tried using > and <

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

Re: Doxygen Command Help Required

Steve Thresher10-Dec-09 5:51

Steve Thresher

10-Dec-09 5:51

Doesn't look too pretty in the source file but does the job. Thanks for you help.

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