I want to send a a (void *) to a function. (And the function sends the data to te rs232 port.)
If I have a char I can just use
char MyMessage[3] = "hei";
void *Message = MyMessage;
myfunction(Message);
How can I use unsigned int, Byte and unsigned char??
I have tried to cast them to (void *) but without success...
I also wonder how I can use strcat with differnts types..
BYTE number;
strcat(ex1, number) dosn't seems to work..
Please help me!
Given a function like this
void myFunction ( const void *data, size_t len );
Then say
char message[]="hello";
myFunction( message, strlen(message) );
int foo = 123;
myFunction( &foo, sizeof(foo) );
char ch = '@';
myFunction( &ch, sizeof(ch) );
etc
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
no you cant, because "hei" includes the '\0' character so you need 4 chars for MyMessageOriginally Posted by EirikO
> no you cant, because "hei" includes the '\0' character so you need 4 chars for MyMessage
It's actually valid (if somewhat dubious) to initialise an 'n' char array with 'n' characters in C.
It's not valid in C++ though.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
>I also wonder how I can use strcat with differnts types..
>BYTE number;
>strcat(ex1, number) dosn't seems to work..
Try sprintf().
Code:BYTE number = 123; char buf[100]; sprintf(buf, "%s %d", ex1, (int) number);
