String to byte ptr ?

BlitzMax Forums/BlitzMax Programming/String to byte ptr ?

Filax (Posted 2005) [#1]

Hi :) I have try to convert an old bmax source code with the new version 1.10 but the program crash on this line B.Stream=BASS_StreamCreateFile(0,File,0,0,B.MusicFlag|BASS_MP3_SETPOS) Error : "Unable to convert from string to byte ptr" I think that the FILE arg is the cause (it's a string) but i don't know how solve this problem ? me and the pointer ... But the BASS DLL function calling nee byte ptr : Global BASS_StreamCreateFile(mem:Int, file:Byte Ptr, offset:Int, length:Int, flags:Int)"Win32" = GetProcAddress(DllHandle,"BASS_StreamCreateFile")

Kev (Posted 2005) [#2]

filax, try this. Local file$ = "c:test\test.exe" Local file_str_pointer:Byte Ptr = Byte Ptr file$

Filax (Posted 2005) [#3]

Hi Kev Your source generate the same error ! i don't know why !

Kev (Posted 2005) [#4]

the small example compiles fine here, try. Local file:String = "c:test\test.exe" Local file_str_pointer:Byte Ptr = Byte Ptr file

Filax (Posted 2005) [#5]

The solution is : ToCString() Local File_Pointer:Byte Ptr=File.ToCString() B.Stream=BASS_MusicLoad(0, File_Pointer, 0, 0,B.MusicFlag,0)

Kev (Posted 2005) [#6]

hey filax i dont see the new beta 1.11? is it not available yet?

Filax (Posted 2005) [#7]

In another section.

Kev (Posted 2005) [#8]

i dont filax, but thanks.

Hotcakes (Posted 2005) [#9]

filax, you're not supposed to let people know that area exists. =]

Filax (Posted 2005) [#10]

Sure but ... it's not armaggeddon :) people cannot go there.

tonyg (Posted 2005) [#11]

...but people will now *want* to go there!

marksibly (Posted 2005) [#12]

Hi, Ok, shouldn't really be talking about this here but a heads up wont hurt... The next release of Max will no longer automatically convert strings to Byte Ptr's - you need to explicitly call ToCString... Local p:Byte Ptr=mystring.ToCString() ...do stuff with p... MemFree p ...Note the MemFree after you've finished with the Byte Ptr. The reason for this is that with automatic GC you can't predict when such 'automatic cstrings' may be reclaimed, so I decided to take them out of the GC loop altogether.

Filax (Posted 2005) [#13]

Ok mark thanks ! to clarify. Sorry for ... shut !! But i did not think that this problem of programming was specific to the beta 1.11, if not, I would have posted aillor, afflicts for the mistake.