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TheGood
Joined: 30 Jul 2007
Posts: 372
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 Posted: Tue Dec 30, 2008 12:23 am Post subject: How to get a string from its pointer and length |
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As the title says, I need the most efficient (read, fastest) way to retrieve a string if you only know its address and its length.
This is what I have right now:
| Code: | sTest := "This is a test sentence."
MsgBox % PtrToStr(&sTest, StrLen(sTest)) ;%
ExitApp
PtrToStr(ptr, len) {
VarSetCapacity(s, len, 0)
Loop %len%
s .= Chr(*(ptr + A_Index - 1))
Return s
} |
Is there a faster way to do this?
Edit: I forgot to add, I tried messing around with RtlCopyString and RtlCopyBytes, but I get an ErrorLevel of -4 (function not found) |
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Lexikos
Joined: 17 Oct 2006
Posts: 4367
Location: Qld, Australia
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| Posted: Tue Dec 30, 2008 12:49 am Post subject: |
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If the string is always null-terminated (as with all AutoHotkey strings), the easiest way is:
| Code: | sTest := "This is a test sentence."
MsgBox % DllCall("MulDiv", int, &sTest, int, 1, int, 1, str)
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MulDiv(x,1,1) returns x unmodified, but DllCall interprets the return value as a string.
If the string isn't null-terminated or you want only a portion of the string, you may use lstrcpyn via DllCall. |
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TheGood
Joined: 30 Jul 2007
Posts: 372
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| Posted: Tue Dec 30, 2008 1:15 am Post subject: |
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| Lexikos wrote: | | MulDiv(x,1,1) returns x unmodified, but DllCall interprets the return value as a string. |
Very interesting behaviour. Is that an AHK thing, or the dll itself? Is it because AHK knows it's a string pointer that was passed and not any number? |
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TheGood
Joined: 30 Jul 2007
Posts: 372
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| Posted: Tue Dec 30, 2008 1:22 am Post subject: |
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| Sorry, didn't see the "str" in the return type parameter |
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SKAN
Joined: 26 Dec 2005
Posts: 7159
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| Posted: Mon Jan 05, 2009 10:59 am Post subject: |
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| Lexikos wrote: | | Code: | sTest := "This is a test sentence."
MsgBox % DllCall("MulDiv", int, &sTest, int, 1, int, 1, str)
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MulDiv(x,1,1) returns x unmodified, but DllCall interprets the return value as a string. |
  Thanks!
_________________
Suresh Kumar A N |
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