[SOLVED] DLLCall dword not working? [[ DLLCall BOOL type?

[FaT3oYCG]

Hi havent been arround here for a while but i have recently decided to pick autoit up again, i have decided to work on writing a bluetooth library.

the problem that i have come accross is not finding the documentation, api calls and function references for my bluetooth dll but with the DLLCall function of autoit, i have looked at the documentation and the function i would like to use in the dll is a boolean return value but searching the documentation that is not documented to be a return type of the DLLCall function, can anyone help me out on that one.

Thanks.

Edited June 20, 2009 by FaT3oYCG

[Yashied]

DllCall('user32.dll', 'int', 'Beep', ...

Edited June 20, 2009 by Yashied

[FaT3oYCG]

thanks, ok now i have a problem with sending a parameter to a nother function

the function in the dll takes this formt according to the API

BOOL function_name(DWORD dword_value)

and the dword_value seems to take the form of a number i.e. a time in seconds

ok so i have used

$result = DLLCall($dll, "int", "function_name", "dword", "1")

$result = DLLCall($dll, "int", "function_name", "dword", 1)

$result = DLLCall($dll, "int", "function_name", "int", "1")

$result = DLLCall($dll, "int", "function_name", "int", 1)

yet autoit just crashes and gives error number -1073741819

[SmOke_N]

thanks, ok now i have a problem with sending a parameter to a nother function

the function in the dll takes this formt according to the API

BOOL function_name(DWORD dword_value)

and the dword_value seems to take the form of a number i.e. a time in seconds

ok so i have used

$result = DLLCall($dll, "int", "function_name", "dword", "1")

$result = DLLCall($dll, "int", "function_name", "dword", 1)

$result = DLLCall($dll, "int", "function_name", "int", "1")

$result = DLLCall($dll, "int", "function_name", "int", 1)

yet autoit just crashes and gives error number -1073741819

How was the DLL compiled?

Have you tried:

$a_result = DLLCall($dll, "int:cdecl", "function_name", "dword", 1)
MsgBox(64, "Bool Return", $a_result[0])

?

Edit:

Also remember that the 3rd parameter is case sensitive.

Edited June 20, 2009 by SmOke_N

[FaT3oYCG]

thanks a load the cdecl was the problem, i dont realy know what that does but im guessing it has something to do with a C type declaration but yeah i know the third param is case sensitive but thanks for the advice now i can get to work making my bluetooth script thanks.

[martin]

thanks, ok now i have a problem with sending a parameter to a nother function

the function in the dll takes this formt according to the API

BOOL function_name(DWORD dword_value)

and the dword_value seems to take the form of a number i.e. a time in seconds

ok so i have used

$result = DLLCall($dll, "int", "function_name", "dword", "1")

$result = DLLCall($dll, "int", "function_name", "dword", 1)

$result = DLLCall($dll, "int", "function_name", "int", "1")

$result = DLLCall($dll, "int", "function_name", "int", 1)

yet autoit just crashes and gives error number -1073741819

I think that in C a boolean type can be the equivalent of "ubyte" in AutoIt so it is worth trying that. It's difficult to be sure because C doesn't actually have a boolean type and the author could have used a char type or int as a return value.

If the value passed should be a dword then don't use a string.

Also, are you certain the function is really called function_name? (or are you just using that for the example?)

Try

$result = DLLCall($dll, "int", "function_name", "dword", 0x00000001);but I think just 1 should work
 
;OR
 $result = DLLCall($dll, "ubyte", "function_name", "dword", 0x00000001)

You might need to use the cdecl calling method, it depends how the dll was written

$result = DLLCall($dll, "int:cdecl",  "function_name", "dword", 0x00000001)
;and also try
 $result = DLLCall($dll, "ubyte:cdecl",  "function_name", "dword", 0x00000001)

Edited June 20, 2009 by martin

[monoceres]

thanks a load the cdecl was the problem, i dont realy know what that does but im guessing it has something to do with a C type declaration but yeah i know the third param is case sensitive but thanks for the advice now i can get to work making my bluetooth script thanks.

cdecl is a calling convention. It's a set of rules that determines how the interpreter/compiler should push the parameters on to the stack. If you use the wrong one the stack will be corrupted and after that it's game over.

I think that in C a boolean type can be the equivalent of "ubyte" in AutoIt so it is worth trying that. It's difficult to be sure because C doesn't actually have a boolean type and the author could have used a char type or int as a return value.

Just to clarify, in WINAPI ( written in C ) a BOOL is just a typedef for int. In C++ type called bool which is indeed one byte (as you said ubyte would be a good replacement in autoit). However I haven't seen the usage of a bool anywhere when using dll's (due to the fact that most libraries implemented as dll's are written in C).

Edit: After reading martin's post again I changed my wordings.

Edited June 20, 2009 by monoceres