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a DLL in C problems

i wrote the following snippet in C

__declspec(dllexport) __stdcall int print2scrn(char *name)

I declared in VB6...

declare function wipefiles lib "ctools" print2scrn(strng as string) as
integer
or
declare function wipefiles lib "ctools" print2scrn(strptr(strng as
string)) as integer

(I don't need to declare Alias... or @ since i didn't compile with
underscores)

all my call come back with...
"Can't find DLL entry point print2scrn in ctools"
i've written quite a few other c functions and called them from VB, but
this is a first for me with a STRING. Anybody know anything about how to
do this?
thx, Peter

Jul 17 '05 #1
2 4309
Peter,

Just a couple of thoughts.

1) Pass the string ByVal. The ByVal in this case means a pointer to the VB
type string is actually passed to the DLL function, not the actual VB type
string.

2) After looking at Win API declarations, I believe the function should be
called print2scrn, not wipefiles [don't know where the wipfiles came from as
it is not shown in the C declarative you posted]

Thus:

Declare Function print2scrn lib "ctools" (ByVal strng as String) As Integer

HTH

Rob.

"Peter" <pe**********@shaw.ca> wrote in message
news:2aKdb.38393$I36.25287@pd7tw3no...
i wrote the following snippet in C

__declspec(dllexport) __stdcall int print2scrn(char *name)

I declared in VB6...

declare function wipefiles lib "ctools" print2scrn(strng as string) as
integer
or
declare function wipefiles lib "ctools" print2scrn(strptr(strng as
string)) as integer

(I don't need to declare Alias... or @ since i didn't compile with
underscores)

all my call come back with...
"Can't find DLL entry point print2scrn in ctools"
i've written quite a few other c functions and called them from VB, but
this is a first for me with a STRING. Anybody know anything about how to
do this?
thx, Peter

Jul 17 '05 #2
Rob,
Thx... I'll try that! I didn't know you could pass a string ByVal.
The wipefiles is a different function with the same problem. I guess my
mind wandered.
Peter
Rob Strover wrote:
Peter,

Just a couple of thoughts.

1) Pass the string ByVal. The ByVal in this case means a pointer to the VB
type string is actually passed to the DLL function, not the actual VB type
string.

2) After looking at Win API declarations, I believe the function should be
called print2scrn, not wipefiles [don't know where the wipfiles came from as
it is not shown in the C declarative you posted]

Thus:

Declare Function print2scrn lib "ctools" (ByVal strng as String) As Integer

HTH

Rob.

"Peter" <pe**********@shaw.ca> wrote in message
news:2aKdb.38393$I36.25287@pd7tw3no...
i wrote the following snippet in C

__declspec(dllexport) __stdcall int print2scrn(char *name)

I declared in VB6...

declare function wipefiles lib "ctools" print2scrn(strng as string) as
integer
or
declare function wipefiles lib "ctools" print2scrn(strptr(strng as
string)) as integer

(I don't need to declare Alias... or @ since i didn't compile with
underscores)

all my call come back with...
"Can't find DLL entry point print2scrn in ctools"
i've written quite a few other c functions and called them from VB, but
this is a first for me with a STRING. Anybody know anything about how to
do this?
thx, Peter



Jul 17 '05 #3

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