Re: pointers and structures - Managed C++/CLI Discussion Boards

Re: interface and main in vc++2005...help please

Mark Salsbery16-May-07 5:53

16-May-07 5:53

It seems to me Prasad had it right...you need an actual object to access its "Text" property:

Form1^pForm1 = gcnew Form1()
Application::Run(pForm1);
int container = Convert::ToInt32(pForm1->Text, ...);

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: interface and main in vc++2005...help please

lavy288316-May-07 5:58

lavy2883

16-May-07 5:58

thanks .....I solved the problem

what is the difference in this?

syedhasan15-May-07 18:32

syedhasan

15-May-07 18:32

when we use __value class clr provides an hierarchy of one __gc * and others __nogc *, and when we use __gc class clr provides an hierarchy of two __gc * and others __nogc*, what is the difference or advantage from this?

Confused | :confused:

Thanks,

Syed

TIMESTAMP_STRUCT from MFC to forms

earlgraham15-May-07 10:02

earlgraham

15-May-07 10:02

I’m converting an old MFC program to Windows Forms. In one function there is a TIMESTAMP_STRUCT type. That is defince in an MFC library function (afxdb.h).

I can’t find a replacement for this library. Any leads to locating a way to replace this would be very helpful.
Thanks

Programmer
Glenn Earl Graham
Austin, TX

Re: TIMESTAMP_STRUCT from MFC to forms

Mark Salsbery15-May-07 13:44

Mark Salsbery

15-May-07 13:44

TIMESTAMP_STRUCT is an ODBC type defined in sqltypes.h.

It looks pretty similar to a Windows SYSTEMTIME structure or a .NET System.DateTime struct.

Are you looking for a database class/framework replacement or just for the time struct?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: TIMESTAMP_STRUCT from MFC to forms

earlgraham16-May-07 5:31

earlgraham

16-May-07 5:31

I think this will work. Thanks

Programmer
Glenn Earl Graham
Austin, TX

pointers and structures

klutez12315-May-07 2:49

klutez123

15-May-07 2:49

Right now I'm creating a program that declares a structure, which also has enum inside it. Now I believe I declare the structure right, but the next step is to create a loop that has the user enter 5 different items of data for library information. But I have to use pointers, so when the loop runs and I enter the information, the data has to be sent to a structure variable only once all six attributes are entered, and the pointer values should be used to create the structure.

I was given an example:

cin >> a;
cin >> b;
library.dewey = &aptr;

This is my code so far:

struct card_catalogue<br />
	{ <br />
		float dewey;<br />
		string title;<br />
		string author;<br />
		int released;<br />
	        int num_pages;<br />
		enum type {fiction = 1, non-fiction, reference, pond};<br />
    };<br />
<br />
int main()<br />
{<br />
return 0;<br />
}<br />

Re: pointers and structures

led mike15-May-07 6:15

led mike

15-May-07 6:15

Why would you post this question in the C++/CLI forum? I would think being able to 'read' would be a prerequisite for whatever course this assignment is from. WTF | :WTF:

led mike

output to console in Vc++2005

lavy288315-May-07 1:55

lavy2883

15-May-07 1:55

Hello... I have a function which takes my data from "Contload.xml"...and put it in the variable "Wc", how can I use this variable in the main program ...so that it be able to see it in the console.....

void readfromfile(String^ strFName,int Wc)
{
strFName = gcnew String("e:\\Contload.xml");
DataSet^ dataset = gcnew DataSet();
dataset->ReadXml(strFName);
DataRowCollection^ rows;
int Wc,Hc, Dc,idi,ix;
int id[100];
int w[100];

rows = dataset->Tables[0]->Rows;
for each (DataRow^ row in rows)
{
Wc = Convert::ToInt32(row["ContainerWidth"], System::Globalization::CultureInfo::CurrentCulture);
}
how can I cal this "Wc" in the main ...?

int main(int argc, char *argv[])
{
String^ filename = gcnew String("e:\\Contload.xml");
readfromfile(filename);
Console::WriteLine("Width: {0}",Wc);b>

lavy

Re: output to console in Vc++2005

Mark Salsbery15-May-07 5:55

Mark Salsbery

15-May-07 5:55

Maybe

Console::WriteLine("Width: {0}", Wc.ToString());

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: output to console in Vc++2005

StevenS_Dev21-May-07 4:10

StevenS_Dev

21-May-07 4:10

If you want both readfromfile and Main to know about the variable Wc, then one option is to use what is called 'file scope'. If you define 'Wc' in file scope, then the variable becomes global for this ONE file. You simply define 'int Wc;', or perhaps 'static int Wc;' at the top of your file. Now you can use Wc anywhere in this file.

The current code will only print out the last result of Wc. Is that what you want? If you want to print Wc for each loop, you will need the WriteLine inside the for loop.

Re: output to console in Vc++2005

lavy288321-May-07 4:12

lavy2883

21-May-07 4:12

thanks...I've done it...

missing ; before *

subramanyeswari14-May-07 22:48

subramanyeswari

14-May-07 22:48

Hi,

I declared a managed struct
public ref struct FconvertRecord
{
};

This i am using in unmanaged class like this
Convert(FconverRecord *);

But this is giving error missing ; before *.

Thanks in advance.

Regards, Eswari

Re: missing ; before *

Mark Salsbery15-May-07 5:51

Mark Salsbery

15-May-07 5:51

Shouldn't you be using ^ instead of *?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

__loctotime_t problem

bouli14-May-07 21:12

bouli

14-May-07 21:12

Hello gurus,

I have a compilation and linking problem with the __loctotime_t.
Is there an equivalent of this function in Win32?
To wich library belongs this function?

How can I solve my problem?

Best regards.

Fred.

There is no spoon.

The good, the bad and the ugly (or C#, COM and C++/CLI)

originSH14-May-07 5:11

originSH

14-May-07 5:11

I have a little bit of interop in C# which calls StgOpenStorageEx and returns an IStorage COM object:

[DllImport("ole32.dll")]
//AJ: http://www.pinvoke.net/default.aspx/ole32/StgOpenStorageEx.html
//AJ: http://msdn2.microsoft.com/en-us/library/aa380342.aspx
private static extern int StgOpenStorageEx([MarshalAs(UnmanagedType.LPWStr)]string pwcsName,
uint grfMode,
uint stgfmt,
uint grfAttrs,
ref STGOPTIONS pStgOptions,
IntPtr reserved2,
[In] ref Guid riid,
[MarshalAs(UnmanagedType.IUnknown)] out object ppObjectOpen);

IStorage structuredStorageFile = (IStorage )ppObjectOpen;

The IStorage interface isn't defined in the BCL's so we're making it ourselves:

[ComImport]
[Guid("0000000b-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
//AJ: http://www.pinvoke.net/default.aspx/Interfaces/IStorage.html
public interface IStorage
{ ... }

This object is used in various places inside our C# code with perfectly good results and all is well. Now though we're wanting to pull that object into C++/CLI, which is no problem. Then we want to pass it to 'BindIFilterFromStorage' to retrive the appropriate IFilter, which is a problem. We've had a bit of a poke around and tried getting 'BindIFilterFromStorage' to take the object but we just get '8000ffff' Catastrophic failure all the time.

If any one could shead any light on how we can achive this or indeed even if its just not possible that would be great!

Andy

error in readxml with database

lavy288314-May-07 5:10

lavy2883

14-May-07 5:10

I created the Xml file, I want to put the data from xml in a table....I have my function like this...

void readfromfile()
{
String^ strFName = gcnew String("d:\\Contload.xml");
DataSet^ ds = gcnew DataSet();
DataTable^ table;
DataRow^ row;
int i;

try
{
ds->ReadXml(strFName);
DataRowCollection^ dr = ds->Tables[0]->Rows;
}
finally
{
delete strFName;
}
}
but I don't know how to do next....to put the data from the Xml in Tables[]

I created an for like...

for (i=0; iTables->Count; i++)
{
table = ds->Tables->Item[i];...................
.......}
but it give me an error :

Error 6 error C2039: 'Item' : is not a member of 'System::Data::DataTableCollection' ...

can you tell me at least why it give me this error...please

Re: error in readxml with database

originSH14-May-07 5:53

originSH

14-May-07 5:53

With C++/CLI you can use 'for each':

for each(Table table in ds.Tables)
{}

readxml with dataset

lavy288314-May-07 4:18

lavy2883

14-May-07 4:18

Hello, I have an Xml and I want to put data from it in tables how can I do this ...please if you have an idea of example or something like this..help me...thanks

lavi

Re: readxml with dataset

Hamid_RT22-May-07 2:04

Hamid_RT

22-May-07 2:04

See this[^] is helpfuls for you?

WhiteSky

Re: readxml with dataset

lavy288322-May-07 5:30

lavy2883

22-May-07 5:30

thanks ...I've done it

Re: readxml with dataset

lavy288322-May-07 5:31

lavy2883

22-May-07 5:31

thanks i've done it

Re: readxml with dataset

Hamid_RT22-May-07 7:40

Hamid_RT

22-May-07 7:40

WhiteSky

Re: AfxMessageBox and Strings!!!

led mike14-May-07 4:51

led mike

14-May-07 4:51

If Christian Graus were around he would let you know that this is the C++/CLI forum, as the first message in the forum states, and your question does not seem to pertain to that subject therefore it is in the wrong forum.

To find the answer to your question read the documentation on the _T() macro.

led mike

How to pass a function as an argument to other function

subramanyeswari14-May-07 3:12

subramanyeswari

14-May-07 3:12

Hi,

I have a function DataPeak(const void* el1, const void* el2) in class oconvew.h

Now i have to pass this as an argument to other function
qsort(void*, size_t, size_t,pointer to DataPeak)
I did like this
qsort(x,num,sizeof(m),&oconvew::DataPeak)..

It is giving qsort cannot convert all required two arguments.

Any help is appreciated.

Thanks, Eswari

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