It's possible with EUDs to detect if a player has selected anything for a given selection slot. However, it's not possible to detect if a player is using a multi-selection hack, because there isn't actually any address in SC's memory other than the twelve selection slots.
To check if anything is selected for the current selection slot, use "At least 1" as the value. If the value at the address is 0, it means nothing is selected. Example:
Detecting Number Of Units Selected
Trigger("Player 8"){
Conditions:
Memory(161889, Exactly, 0);
Memory(161890, Exactly, 0);
Memory(161891, Exactly, 0);
Memory(161892, Exactly, 0);
Memory(161893, Exactly, 0);
Memory(161894, Exactly, 0);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 0 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, Exactly, 0);
Memory(161891, Exactly, 0);
Memory(161892, Exactly, 0);
Memory(161893, Exactly, 0);
Memory(161894, Exactly, 0);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 1 unit selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, Exactly, 0);
Memory(161892, Exactly, 0);
Memory(161893, Exactly, 0);
Memory(161894, Exactly, 0);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 2 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, Exactly, 0);
Memory(161893, Exactly, 0);
Memory(161894, Exactly, 0);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 3 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, Exactly, 0);
Memory(161894, Exactly, 0);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 4 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, Exactly, 0);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 5 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, Exactly, 0);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 6 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, At least, 1);
Memory(161896, Exactly, 0);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 7 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, At least, 1);
Memory(161896, At least, 1);
Memory(161897, Exactly, 0);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 8 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, At least, 1);
Memory(161896, At least, 1);
Memory(161897, At least, 1);
Memory(161898, Exactly, 0);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 9 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, At least, 1);
Memory(161896, At least, 1);
Memory(161897, At least, 1);
Memory(161898, At least, 1);
Memory(161899, Exactly, 0);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 10 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, At least, 1);
Memory(161896, At least, 1);
Memory(161897, At least, 1);
Memory(161898, At least, 1);
Memory(161899, At least, 1);
Memory(161900, Exactly, 0);
Actions:
Comment("Player 1 has 11 units selected");
}
//-----------------------------------------------------------------//
Trigger("Player 8"){
Conditions:
Memory(161889, At least, 1);
Memory(161890, At least, 1);
Memory(161891, At least, 1);
Memory(161892, At least, 1);
Memory(161893, At least, 1);
Memory(161894, At least, 1);
Memory(161895, At least, 1);
Memory(161896, At least, 1);
Memory(161897, At least, 1);
Memory(161898, At least, 1);
Memory(161899, At least, 1);
Memory(161900, At least, 1);
Actions:
Comment("Player 1 has 12 units selected");
}
//-----------------------------------------------------------------//
If you're trying to use this as a selection hack detector, I don't think you'll make much progress.
Staredit Network > Forums > SC1 UMS Mapmaking Assistance > Topic: [SOLVED] Detecting # of Selected Units
IskatuMesk -- u guys ever look at the "Backend performance improvements" line and kinda you know 👀
Oh_Man -- makes me wonder tho, a brood war achievement project culd be quite something, following the design methodology of SC2 achieves