Ask General Programming Questions Not Worth Their Own Thread

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Ask General Programming Questions Not Worth Their Own Thread

odi3: Dec 17, 2003

Is there a better method to put a struct into a buffer in c using sprintf instead of referencing each of the doubles seperately?
This method seems to defeat the idea of using a structure....

code:


struct Car {
	int PlayerID;
	double PositionX;
	double PositionY;
	double PositionZ;
	double VelocityX;
	double VelocityY;
	double VelocityZ;
	double OrientationX;
	double OrientationY;
	double OrientationZ;
} myCar;

sprintf (buffer, "%d/%d/%d/%d/%d/%d/%d/%d/%d/%d ", 
myCar.PlayerID, myCar.PositionX, myCar.PositionY, myCar.PositionZ, 
myCar.VelocityX, myCar.VelocityY, myCar.VelocityZ, myCar.OrientationX, 
myCar.OrientationY, myCar.OrientationZ);

odi3 fucked around with this message at 05:21 on Mar 8, 2008

# ¿ Mar 8, 2008 05:18

Adbot: ADBOT LOVES YOU

# ¿ May 2, 2024 18:11

odi3: Dec 17, 2003

C Question:

I am trying to send and receive a string of data using blocking sockets and send and recv functions..

buffer is 512 bytes and contains 9 doubles
when I trace, the send function shows the first double as 44.234
but after i receive it, the buffer 44. (it chops off the decimal.

Anyone know what causes this? do i have to format the doubles in some fashion before sending them? If there are any sections of code u need let me know.

code:

void mySend(struct Car myCar){
	sprintf (buffer, "%lf%lf%lf%lf%lf%lf%lf%lf%lf", myCar.positionX, myCar.positionY, myCar.positionZ, 
													myCar.velocityX, myCar.velocityY, myCar.velocityZ, 
													myCar.orientationX, myCar.orientationY, myCar.orientationZ);
	

	send (s, buffer, sizeof(buffer), 0);
}

void myReceive(int playerID, SOCKET s, char buffer[BUFSIZ])
{
			int error = recv (s, buffer, sizeof(buffer),0); // tcp

	sscanf(buffer, "%le%le%le%le%le%le%le%le%le", &cars[playerID].positionX, &cars[playerID].positionY, &cars[playerID].positionZ, 
												&cars[playerID].velocityX, &cars[playerID].velocityY, &cars[playerID].velocityZ, 
												&cars[playerID].orientationX, &cars[playerID].orientationY, &cars[playerID].orientationZ);
}

//In main client
send (s, buffer, sizeof(buffer), 0);

//In main for Server
int error = recv (s, buffer, sizeof(buffer),0)

Thanks!

odi3 fucked around with this message at 06:53 on Mar 13, 2008

# ¿ Mar 13, 2008 06:44

odi3: Dec 17, 2003

How would i do that?
when i debug and print the code before i send and receive, its correct. I assumed that sscan and sprintf were working properly?

odi3 fucked around with this message at 07:21 on Mar 13, 2008

# ¿ Mar 13, 2008 07:19

odi3: Dec 17, 2003

i read that sscanf ignores spaces. I am pretty new to all this so i probably misunderstood/misread my book.

Thanks for the help! ill try it out

Edit: so i attempted to send 9 doubles
1.1
2.2
3.3
etc

the buffer before the send command showed 9, but only 1.1 came out on the rec side.

odi3 fucked around with this message at 08:10 on Mar 13, 2008

# ¿ Mar 13, 2008 07:34

odi3: Dec 17, 2003

I am having difficulty adding conditional background formatting to a matrix in an SSRS Report in Visual Studio 2013.

A simple version of report display looks like this:

The report has Three Fields fields
"Data", "Group", "Amount"

The Data looks like this:
Data Group Amount
Datavalue1 GroupValue1 1
Datavalue2 GroupValue2 4
Datavalue1 GroupValue2 3
Datavalue2 GroupValue1 2

The report in design mode looks like this:

Group
Data =sum(amount)

The displayed Matrix in preview mode looks like this:

GroupValue1 GroupValue2
DataValue1 | 1 | 3
DataValue2 | 2 | 4

When the report is displayed, I would like the background for items under groupValue1 to display as red if the corresponding item under groupvalue2 equals 3.
The problem is that in design mode, I dont know how to differentiate between referencing fields under groupvalue1 or groupvalue2

Anyone know some code I can put in the BackgroundColor Properties of the value field that could accomplish this?

Any help is greatly appreciated!!

# ¿ Jun 24, 2016 21:42

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Ask General Programming Questions Not Worth Their Own Thread