L-value error in threads and processess

[charlie]

During compilation I receive a compiler error
#include<windows.h>
#include<iostream>
using namespace std;
typedef struct{
int a;
char name[7];
}params;
void print(params*lparam)
{
for(int i=0;i<10;i++){
cout<<"A in struct params is "<<lparam->a<<endl;
cout<<"Name in struct params is "<<lparam->name<<endl;
Sleep(5000);
}
void main()
{
params myparams;
myparams.a=1000;
myparams.name="joseph";
HANDLE threadhandle;
DWORD threadID;
threadhandle=CreateThread(0,0,(LPTHREAD_START_ROUTINE)print,&myparams,0,&threadID);
if(INVALID_HANDLE_VALUE==threadhandle)
{
cerr<<"Thread not created..."<<endl;
return -1;
}
//if threadcreated wait for execution to finish
while(WaitForSingleObject(threadhandle,9000)==WAIT_TIMEOUT){
cout<<"function execution fcompleted..."<<endl;
}
return 0;
}

I'm using VC++ 6.0 I receive the folowing compiler error and its the first I come across with such errors can somebody help...
the error says:
errorC2106:'=' :left operand must be l-value
From what I know a left operand is a variable or address.Thanks

[z05DSL3A]

There seem to be a number of thing with your code:

1: typedef stuct I assume that should be typedef struct
2: void print(param*lparam), should that be params?
3: You open a block { in the print function but do not close it.
4: You have main defined as void and try to return a value;
and finally the bit that I assume is giving the error is myparams.name="joseph";, you will need to use a function to copy "joseph" into "myparams.name".

PS. please use code tags to post code: [code]your code goes here[/code]

[charlie]

Thank for your advice It 's working .I have used the strcpy() function

[charlie]

Thanks for your advice It 's working .I have used the strcpy() function also I would like to know what the error meant I mean the lvalue error and how I get away with it.

[z05DSL3A]

error C2106:'=' :left operand must be l-value

An l-value is one that can appear on the left side of an assignment, so it is basically saying you can not assign a new value to the left hand side.

I must admit I would have expected the error to be along the lines of
error C2440: '=' : cannot convert from 'const char [7]' to 'char [7]'

[charlie]

I don't know but that is way it appeared on my compiler error.hope you don't mind me asking which compiler are you using ?mine is vc++ 6.0 ...

[z05DSL3A]

Visual Studio Team System 2008 and Visual Studio 2005 Team Edition for Software developers. I also have Visual Studio 6 Enterprise Edition, for the older projects that have not been migrated.

[charlie]

Have done DirectX before? I'm still learning C++ I can say.But know I want to How my OS works before decide to something else.Your advice..!what should I do then...

[Zaita]

I would suggest using strncpy() instead of strcpy() or snprintf() (not sprintf().

strcpy() is not save from buffer overflows, it's generally considered bad practice to use it.

Edit: I'd also suggest using string instead of character arrays and pointers to characters. (e.g char *)

[charlie]

Thanks Zaita...OK now it's time for your advice ...!

[z05DSL3A]

Do you want to know the internal working of Windows, or how to write Windows native code?

[charlie]

I wanna know how the internal workings of windows......