Signal-Slot, object instances

[zlatko]

What actually do you mean?
In designer genearated files i never see something like that

[ct]

Well in designer you don't actually have the
MyObj *obj;

it is written at the public member Object explorer.
Now, generally before using the object we need to create a instance for it..I am asking can we use the object without creating its instance in a signal slot connection ..and what may its consequences be.

[orb9]

MyObj *obj;
connect(obj,SIGNAL(),this,SLOT());

MyObj *obj;
connect(obj,SIGNAL(),this,SLOT());

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This will crash.

You are passing an uninitialized pointer to connect(). If you're lucky obj is initialized with 0 and connect() checks for 0-pointers, but generally accessing an uninitialized object is simply shooting yourself in the foot.