Shoutbox

Is it possible to detect whether MPL is running on a 64-bit version of Windows? I've tried conditional compilation, but @if(@_win32) seems to always return true, even on my x64 machine.

Second problem: EM_SETSEL does not set the selection to the specified start and stop indexes, but deselects all text. This seems to be an x64 problem (which is why I posted in the first place ). How can I solve this?

Try IsWow64Process although I really don't think the EM_SETSEL thing has much to do with x64

I'll try have the IsWow64Process thingy.

About EM_SETSEL: I concluded it is an x64 problem after reading this: http://support.microsoft.com/kb/109550.

It's far more likely that it's a bug in how you use it than it being related to x64.
Messenger is a x86 (32-bit) program, and as such is run in a x86 enviroment with x86 APIs. x86 processes do not have access to x64 APIs, and as such EM_SETSEL would just take 32-bit parameters.
The article you mentioned is about 16-bit vs 32-bit, not about 32-bit to 64-bit, and on top of that it checks on-compile time, meaning that if you'd compile your app as 16-bit, it'd have used the 16-bit methods. Messenger is compiled as 32-bit, and as such should just use 32-bit APIs.
Furthermore, changing your programs behaviour on x64 windows even though you're a x86 process would only introduce weird bugs.

I'd suggest you read up on EM_SETSEL here and try to find out where you went wrong.
Also I suggest you test your script on a 32-bit machine, and I can almost assure you that the same bug will appear, as it's most definitely not related to your 64-bit OS

Gotta get some reading lessons

Anyways, I started at the MSDN article. I guess I'd post some code?

JScript code:

---

// Example
var Text = "Hello world!";
var pText = "Hello world";

var SetSel = function(Start,End) {
    Interop.Call("User32.dll","SendMessageW",hWnd,EM_SETSEL,Start,End);
}

(...)

SetSel(Text.length,pText.length);

---

NB: the hWnd parameter is known.

Just out of curiosity, I would have to test this myself but:

js code:

---

SetSel(12, 11)

---

Is essentially what you are doing... I dont know what the ramifications of that are or how long the text in the edit control you are testing is.

Well, I've put a longer string in the edit box and tried indexes 4 and 12 (and reversed), but it still doesn't work: no text is selected. The edit control is basically a combo box with the AllowEdit attribute set to true.

Btw, what does "ramifications" mean?

Ramifications: what sideeffects or what would happen by doing it.

Have you tried EM_GETSEL to see where the starting position is?

Stupid question but what do you have EM_SETSEL defined as? should be 0xB1

Is it an Edit or Rich Edit control? You cannot use that message for a control other than an edit or rich edit control.

quote:

---

Originally posted by http://msdn.microsoft.com/en-us/library/bb761661%28VS.85%29.aspx
EM_SETSEL

Selects a range of characters in an edit control. You can send this message to either an edit control or a rich edit control.

---

Look at the CB_SETEDITSEL message instead

wParam isn't used in this message. You will need to make a word consisting of the low and high bytes.

js code:

---

var makeword = function (a,b) { return a | (b << 8); }

---

Where A is the LowByte and B is the HighByte.

Well, I've double-checked the EM_SETSEL, it is properly defined. I've just tried EM_GETSEL, starting and ending positions are both 0.

And thanks for adding a new word to my vocab

Seen your bump, reading now

Seen

I've been messing around with those macros, but can barely read them, due to all those casts Thanks for making it clear now

Well you got me at least one step further: now all text is selected, and I know why:

JScript code:

---

Number.prototype.LOWORD = function() {
    return this & 0xFFFF;
}

Number.prototype.HIWORD = function() {
    return (this >> 16) & 0xFFFF;
}

var MAKEWORD = function (a,b) {
    return a | (b << 8);
}

var D = MAKEWORD(4,12);
Debug.Trace((4).toString(2));
Debug.Trace((12).toString(2));
Debug.Trace(D.toString(2));

Debug.Trace(D.LOWORD());
Debug.Trace(D.HIWORD());

---

Output:

quote:

---

100
1100
110000000100
3076
0

---

quote:

---

Originally posted by SmokingCookie
Well, I've double-checked the EM_SETSEL, it is properly defined. I've just tried EM_GETSEL, starting and ending positions are both 0.

And thanks for adding a new word to my vocab

Seen your bump, reading now

Seen

I've been messing around with those macros, but can barely read them, due to all those casts Thanks for making it clear now

Well you got me at least one step further: now all text is selected, and I know why:

JScript code:

---

Number.prototype.LOWORD = function() {
    return this & 0xFFFF;
}

Number.prototype.HIWORD = function() {
    return (this >> 16) & 0xFFFF;
}

var MAKEWORD = function (a,b) {
    return a | (b << 8);
}

var D = MAKEWORD(4,12);
Debug.Trace((4).toString(2));
Debug.Trace((12).toString(2));
Debug.Trace(D.toString(2));

Debug.Trace(D.LOWORD());
Debug.Trace(D.HIWORD());

---

Output:

---

Are you perhaps confusing MAKEWORD with MAKELONG ?
BYTE = 8-bit
WORD = 16-bit
DWORD/long = 32-bit

MAKEWORD takes two BYTEs and turns it into a WORD
MAKELONG takes two WORDs and turns it into a DWORD/LONG
LOWORD gets a WORD from a DWORD/LONG (first one passed to MAKELONG)
HIWORD " " " second one

I think in your code you intended to use MAKELONG instead of MAKEWORD, MAKELONG would be:
var MAKELONG = function(a,b) { return a|(b<<16); };