using C# to draw over directx games - C# Discussion Boards

bkelly1330-Dec-07 15:27

30-Dec-07 15:27

This article on delegates, found here: http://www.codeproject.com/KB/cs/cs_delgates.aspx

Presents the following code:

<br />
class Del<br />
{<br />
    delegate void dl1();<br />
    public void fn1()<br />
    {<br />
        System.Console.WriteLine("Inside f1");<br />
    }<br />
    public void fn2()<br />
    {<br />
        dl1 obj = new dl1(fn1);<br />
    }   <br />
} <br />

I enter the code into C# Visual Express 2008 and select the help key for the phrase “obj” within the last line of code. The result I get contains this statement: “This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.”

Obviously that is of no help. The book “C# in easy steps” does not contain an explanation. I found a two part article on key words and it did not help.

What does this last line accomplish? What does the key word “obj” do here?

Thanks for your time

and a follow up

bkelly1330-Dec-07 15:35

bkelly13

30-Dec-07 15:35

A little bit later in the article the author has the code:

<br />
class Del<br />
{<br />
    delegate void dl1();<br />
    public void fn1()<br />
    {<br />
        System.Console.WriteLine("Inside f1");<br />
    }<br />
    public void fn2()<br />
    {<br />
        dl1 obj = new dl1(fn1);<br />
        obj();<br />
    }   <br />
}<br />
class Example<br />
{<br />
    public static void Main()<br />
    {<br />
    }<br />
}<br />

Why does he put Main inside a class?

Thanks for your time

Re: and a follow up

DaveyM6930-Dec-07 16:22

DaveyM69

30-Dec-07 16:22

The Main() function is called automatically on program start - create a blank Windows Forms Application and examine the Program.cs file - a Main function is created which runs the rest of the application. The author of the article is creating his own rather than using an auto-generated one.

Re: and a follow up

PIEBALDconsult31-Dec-07 16:21

PIEBALDconsult

31-Dec-07 16:21

A) obj is just a name, he could have chosen X or temp or Zaphod

B) All methods must be in a class. (Unlike C/C++)

Re: and a follow up

bkelly1331-Dec-07 16:27

bkelly13

31-Dec-07 16:27

Yeah, I see that now. Thank you for taking the time to reply.

Thanks for your time

Re: help on keyword obj

DaveyM6930-Dec-07 16:17

DaveyM69

30-Dec-07 16:17

obj in this case is simply the name of a new dl1 object (the delegate) - not a keyword.

Re: help on keyword obj

bkelly1330-Dec-07 16:39

bkelly13

30-Dec-07 16:39

I don't know if I am confused or enlightened. Let me try to explain and tell me if I follow you. Start with the code:

<br />
dl1 obj = new dl1(fn1);<br />

This tells the compiler to (left to right):
1. Create something called dl1.
2. Give this new entity the name obj.
3. Create it via the "new" process.
4. Create it in the likness of class dl1. (which has always seemed redundant because the first phrase of this line of code specified that to begin with)
5. Assign this object the target function fn1.

The way I see (saw) obj used so often, it just really seemed like a keyword. I would really like to see people use more descriptive names for classes, methods, and variables.

Thanks for your time

using C# to draw over directx games

Member 428380730-Dec-07 11:30

Member 4283807

30-Dec-07 11:30

can someone help me with a program in C# that draws over a game that uses directx?

i want it to be kind of like fraps displays the framerate on the upper left corner of the game. can someone explain how i would do this in C#?

thanks in advanced

Re: using C# to draw over directx games

Kristian Sixhøj30-Dec-07 12:46

Kristian Sixhøj

30-Dec-07 12:46

A quick Google search:

http://www.gamedev.net/community/forums/topic.asp?topic_id=367591[^]

Hope that helps.

Kristian Sixhoej

"Failure is not an option" - Gene Kranz

Re: using C# to draw over directx games

MarkB77730-Dec-07 16:15

MarkB777

30-Dec-07 16:15

Do you just want to display some text in the top left corner (framerate)?.

The DirectX SDK has a common library included with it (under Samples/C#/Common) which has utilities to easily render text. The file you'll be after is D3DFont.cs. You can render text easily with 3 lines of code using the font class included in this.

If you want to know how to display the framerate take a look in the file D3DApp.cs (under the C# common files again), it has a method starting at line 1148 called "UpdateStats" which does what your looking for (if you can be bothered making sense of it).

Mark.

Device name

Strategic_Thinker30-Dec-07 5:29

Strategic_Thinker

30-Dec-07 5:29

Hi
I have a bluetooth searching devices project wrote in C# , while I'm search for devices it`ll found a device, the MAC address of the device appear , how can I appear the name of the device....

Capturing VB6 event in C#.Net

M A A Mehedi Hasan30-Dec-07 1:17

M A A Mehedi Hasan

30-Dec-07 1:17

Dear All,
I have a VB6 Application which throws events. How can I capture these events in my another C#.Net Application?

Please help me providing articles or links.

Thanks in advance.

Mehedi Hasan

Re: Capturing VB6 event in C#.Net

Michael Sync30-Dec-07 5:35

Michael Sync

30-Dec-07 5:35

What kind of events does VB6 application throw? Can you give us the example?

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Re: Capturing VB6 event in C#.Net

Paul Conrad30-Dec-07 6:41

Paul Conrad

30-Dec-07 6:41

Like Michael said, how is the VB6 event being thrown. Without knowing, we can't really help.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Capturing VB6 event in C#.Net

Michael Sync30-Dec-07 19:02

Michael Sync

30-Dec-07 19:02

seem like this guy " M A A Mehedi Hasan" just want to post something in our forum.. I don't know why there are so many people like that.. they just post the question and if we ask them back, they never reply..

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Re: Capturing VB6 event in C#.Net

Paul Conrad30-Dec-07 19:06

Paul Conrad

30-Dec-07 19:06

Michael Sync wrote:
don't know why there are so many people like that.. they just post the question and if we ask them back, they never reply..

I figure I either made them feel really stupid or answered their inquiry.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Invoke function into mail body in an email

zafax_30-Dec-07 0:12

zafax_

30-Dec-07 0:12

Hi guys i had solution which im confusing that how a body of mail takes streamreader's colllection from a text file. How can i do this? can anyone give me a suggestion, would be great!

function readtext reads a myfile.txt and i want invoke this method to mail.Body. by send mail event.

private static void readtext()
{
FileStream fs = new FileStream("C:\\myfile.txt", FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
sw.BaseStream.Seek(0, SeekOrigin.Begin);
string str = sw.ReadLine();
while (str != null)
{

str = sr.ReadLine();
}
sr.Close();
fs.Close();
}
}

thanks!

so much of happy ending...

Re: Invoke function into mail body in an email

Paul Conrad30-Dec-07 6:42

Paul Conrad

30-Dec-07 6:42

Rephrase it, you aren't making much sense.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Invoke function into mail body in an email

Skippums31-Dec-07 8:09

Skippums

31-Dec-07 8:09

Look into System.Net.Mail (specifically the MailMessage and SmtpClient classes) to send the emails. Also, your method should return the string it is building. Perhaps you should do something like the following (be careful if the file can be large, as it may throw a memory overflow exception)...

private static string ReadText(string fullFilePath) {
    FileStream fs = null;
    StreamReader sr = null;
    try {
        fs = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read);
        sr = new StreamReader(fs);
        return sr.ReadToEnd();
    } finally {
        if (sr != null)
            sr.Close();
        if (fs != null)
            fs.Close();
    }
}

Alternatively, you could send the file as an attachment. Examples of this can be found when you examine the MailMessage class. Hope this helps,

Sounds like somebody's got a case of the Mondays

-Jeff

Re: Invoke function into mail body in an email

zafax_31-Dec-07 8:14

zafax_

31-Dec-07 8:14

thanks, its really helpful!! jeff.

so much of happy ending...

Transferring arrays from C++ library to C# application

Yooval29-Dec-07 22:28

Yooval

29-Dec-07 22:28

Hi,
I'm having trouble in transferring arrays of short integers from C++ library to C# application.
I got the sources of a library, written in C++, that defines interface in IDL file.
The original methods transfer "basic" objects, such as BOOL and BSTR.
I need to add a new method to the interface for transferring two arrays of short integers.
For that purpose, I create two safe arrays and populate them with the numbers.
However, when I try to invoke the C# method I get TypeMismatch error code (when I pass only the string objects, it works OK).

The C++ code includes the following definition in IDL file:
library CodecLib
{
...
dispinterface _ILiveEvents
{
properties:
methods:
...
[id(4), helpstring("method DataReady")] HRESULT DataReady([in] BSTR strForward, [in] SAFEARRAY(short) FwdBuffer,
[in] BSTR strReturn, [in] SAFEARRAY(short) RetBuffer);
};
...
};

The following C# code implements the interface defined in the IDL file:
private void DataReady(string sForward, Array ForwardData,
string sRetrun, Array ReturnData)
{
...
}

The following C++ code prepares the data in the safe arrays:
void CLive::DataReady(short *pFwdBuf, short *pRetBuf, int nBufferSize)
{
long lIndex;

SAFEARRAYBOUND ArrayBound[2];
ArrayBound[0].cElements = nBufferSize;
ArrayBound[0].lLbound = 0;
ArrayBound[1].cElements = nBufferSize;
ArrayBound[1].lLbound = 0;

m_pFwdBuffer = SafeArrayCreate(VT_I2, 1, &ArrayBound[0]);
m_pRetBuffer = SafeArrayCreate(VT_I2, 1, &ArrayBound[1]);

// Set data in safe arrays
for (lIndex=0; lIndex<nBufferSize; lIndex++)
{
SafeArrayPutElement(m_pFwdBuffer, &lIndex, &pFwdBuf[lIndex]);
SafeArrayPutElement(m_pRetBuffer, &lIndex, &pRetBuf[lIndex]);
}

// Send data to clients
Fire_DataReady(m_strForward, m_pFwdBuffer, m_strReturn, m_pRetBuffer);

// Release safe arrays
SafeArrayDestroy(m_pFwdBuffer);
SafeArrayDestroy(m_pRetBuffer);
m_pFwdBuffer = NULL;
m_pRetBuffer = NULL;
}

The following C++ code distributes the data to the clients.
However, calling Invoke() returns TypeMismatch error, with uArgErr equals to 3:
HRESULT Fire_DataReady(BSTR strForward, SAFEARRAY *pFwdBuf,
BSTR strReturn, SAFEARRAY *pRetBuf)
{
HRESULT hr = S_OK;
T * pThis = static_cast<T *>(this);
int cConnections = m_vec.GetSize();

for (int iConnection = 0; iConnection < cConnections; iConnection++)
{
pThis->Lock();
CComPtr<IUnknown> punkConnection = m_vec.GetAt(iConnection);
pThis->Unlock();

IDispatch * pConnection = static_cast<IDispatch *>(punkConnection.p);

if (pConnection)
{
CComVariant avarParams[4];
avarParams[0] = strForward;
avarParams[0].vt = VT_BSTR;
avarParams[1] = pFwdBuf;
avarParams[1].vt = VT_ARRAY;
avarParams[2] = strReturn;
avarParams[2].vt = VT_BSTR;
avarParams[3] = pRetBuf;
avarParams[3].vt = VT_ARRAY;

CComVariant varResult;
unsigned int uArgErr;

DISPPARAMS params = { avarParams, NULL, 4, 0 };
hr = pConnection->Invoke(4, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, &params, &varResult, NULL, &uArgErr);
}
}
return hr;
}

Re: Transferring arrays from C++ library to C# application

ashukasama31-Dec-07 4:56

ashukasama

31-Dec-07 4:56

http://msdn2.microsoft.com/en-us/library/ek1fb3c6.aspx[^]

inserting image to database sqlserver

yemen_programmer29-Dec-07 19:44

yemen_programmer

29-Dec-07 19:44

hello everyone,
how I can insert image to database sqlserver by c# code.
and what the type of image that can save in database sqlserver.

Re: inserting image to database sqlserver

Michael Sync29-Dec-07 22:19

Michael Sync

29-Dec-07 22:19

yemen_programmer wrote:
how I can insert image to database sqlserver by c# code.

You can read this article for that.

http://scriptster.blogspot.com/2007/10/storing-images-in-database-with-c.html

yemen_programmer wrote:
what the type of image that can save in database sqlserver.

AFAIK, you can save any type of image in SQL Server. What SQL sees is the bytes.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Array of objects

eric_tran29-Dec-07 19:27

eric_tran

29-Dec-07 19:27

Good day everyone,

I have a problem that I really need someone help.

I have an array of objects that is filled from the content of a text file. One line in ther text file contains name,address and employeeID.

The problem is that I can not compare the employeeID in the object with a given employeeID.
How can I get the value of employeeID out of the the array of objects?

Please help.Thanks much in advance

Employee[] employeeList = new Employee[100];
employeeList = new Employee[100];
EmpFileReader empfile = new EmpFileReader();
employeeList = empfile.readFile();

//getEmployeeID returns ID
if(employeeList[i].getEmployeeID()== employeeID )
System.out.println(employeeList[i]);

eric

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