NSString stringWithFormat

[Rinzwind]

Trying to get this working...

Code: Select all

v.s = " 1234"
t = CocoaMessage(0, 0, "NSString stringWithFormat:$", @"Test %S", ":$", @v)
If t
  a.s =   PeekS(CocoaMessage(0, t, "UTF8String"), -1, #PB_UTF8)
EndIf

Debug a

Problems with variable argument list..

[wilbert]

Problems with variable argument list..

Yes, CocoaMessage relies on NSInvocation which does not support variadic methods.
You would have to use a CFString method using ImportC or call NSString stringWithFormat directly using the IMP.

Here's an example using CFString

Code: Select all

ImportC ""
  CFStringCreateWithCString(alloc, cStr.p-utf8, encoding = #kCFStringEncodingUTF8)
  CFStringCreateWithFormat1(alloc, formatOptions, format, arg1) As "_CFStringCreateWithFormat"
  CFStringCreateWithFormat2(alloc, formatOptions, format, arg1, arg2) As "_CFStringCreateWithFormat"
  CFStringGetCharacters(theString, location, length, *buffer)
  CFRelease(cf)
EndImport

Procedure.s CFStringGetString(theString)
  Protected Length.i = CFStringGetLength_(theString)
  Protected Dim Buffer.u(Length)
  CFStringGetCharacters(theString, 0, Length, @Buffer())
  ProcedureReturn PeekS(@Buffer())
EndProcedure


v.s = "1234"

Format = CFStringCreateWithCString(0, "Test %S")
FormattedString = CFStringCreateWithFormat1(0, 0, Format, @v)
Debug CFStringGetString(FormattedString)
CFRelease(FormattedString)
CFRelease(Format)

Format = CFStringCreateWithCString(0, "Test %S [%i]")
FormattedString = CFStringCreateWithFormat2(0, 0, Format, @v, 1234)
Debug CFStringGetString(FormattedString)
CFRelease(FormattedString)
CFRelease(Format)

[Rinzwind]

Thanks again, especially for the examples.

ps. IMP?

[wilbert]

IMP?

IMP is the address of the implementation itself.
But after some trying, I couldn't get it to work.

Invoking a method however does seem to work and it might also be possible by using NSInvocation in another way.
Maybe I'll try that also.

Here's the invoking way ...

Code: Select all

ImportC ""
  method_invoke1(receiver, m, arg1, arg2) As "_method_invoke"
  method_invoke2(receiver, m, arg1, arg2, arg3.d) As "_method_invoke"
EndImport


NSStringClass = objc_getClass_("NSString")
Selector = sel_registerName_("stringWithFormat:")
Method = class_getClassMethod_(NSStringClass, Selector)


v.s = "1234"

Format = CocoaMessage(0, 0, "NSString stringWithString:$", @"Test %S")
FormattedString = method_invoke1(NSStringClass, Method, Format, @v)
Debug PeekS(CocoaMessage(0, FormattedString, "UTF8String"), -1, #PB_UTF8)

Format = CocoaMessage(0, 0, "NSString stringWithString:$", @"Test %S [%f]")
FormattedString = method_invoke2(NSStringClass, Method, Format, @v, 12.34)
Debug PeekS(CocoaMessage(0, FormattedString, "UTF8String"), -1, #PB_UTF8)

[mk-soft]

Alternative: Format string like sprintf.

Link:viewtopic.php?f=12&t=32026

Code: Select all

  name.s = "Apple"
  weight.f = 100.5
  SQL.s = Format("INSERT INTO food (name, weight) VALUES ('%s', %.3f)", @name, @weight)
  Debug SQL