How can PB application read dlls
Hi, Are there any functions or a way for a Powerbuilder application to read a particular dll,which is not in a fixed location.For eg,in one laptop it might be under c:\test and in another laptop it can be under c:\temp. Thanks Sayed
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Sayed
1/12/2011 8:50:49 PM
sybase.powerbuilder.general
62418 articles. 
11 followers.
5 Replies
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Since the external function declaration points to a specific directory, I don't think you could point to a directory that is not known until run time. If there is a small set of possible locations, you might use polymorphism as in the old PFC's platform service. It's probably easiest to just copy the dll to a fixed location and specify that in the declaration. IIRC PB doesn't attempt to load the dll until the first time you call one of its methods. Report Bugs to Sybase: http://case-express.sybase.com/cx/welcome.do Product Enhancement Requests: http://my.isug.com/cgi-bin/1/c/submit_enhancement On 1/12/2011 3:50 PM, Sayed wrote: > Hi, > Are there any functions or a way for a Powerbuilder > application to read a particular dll,which is not in a fixed > location.For eg,in one laptop it might be under c:\test and > in another laptop it can be under c:\temp. > > Thanks > Sayed
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Jerry
1/12/2011 9:51:44 PM
Hi Sayed; Is adding the location of the external DLL(s) to the System Path not an option as this would make it transparent to the application? Regards ... Chris President: OSUG / STD Inc. Blog: http://chrispollach.blogspot.com PBDJ: http://chrispollach.sys-con.com SourceForge: http://sourceforge.net/projects/stdfndclass "Sayed" wrote in message news:4d2e1428.6267.1681692777@sybase.com... Hi, Are there any functions or a way for a Powerbuilder application to read a particular dll,which is not in a fixed location.For eg,in one laptop it might be under c:\test and in another laptop it can be under c:\temp. Thanks Sayed
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Chris
1/13/2011 1:17:11 AM
If I'm reading Help correctly, the LIBRARY part of the declaration is required. ALIAS is optional if the PB name is the same as the actual name of the function in the DLL. Report Bugs to Sybase: http://case-express.sybase.com/cx/welcome.do Product Enhancement Requests: http://my.isug.com/cgi-bin/1/c/submit_enhancement On 1/12/2011 8:17 PM, Chris Pollach wrote: > Hi Sayed; > > Is adding the location of the external DLL(s) to the System Path not an > option as this would make it transparent to the application? > > Regards ... Chris > President: OSUG / STD Inc. > Blog: http://chrispollach.blogspot.com > PBDJ: http://chrispollach.sys-con.com > SourceForge: http://sourceforge.net/projects/stdfndclass > > "Sayed" wrote in message news:4d2e1428.6267.1681692777@sybase.com... > > Hi, > Are there any functions or a way for a Powerbuilder > application to read a particular dll,which is not in a fixed > location.For eg,in one laptop it might be under c:\test and > in another laptop it can be under c:\temp. > > Thanks > Sayed
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Jerry
1/13/2011 3:01:51 AM
Hi,
Before the first call to functions from the DLL use LoadLibrary WinAPI
finction to load the DLL from your temp folder.
In declarations of your ext. functions in the LIBRARY clause specify
DLL's file name only (without path).
At program exit or after the first call to the DLL use FreeLibrary
function to unload the DLL, otherwise PB IDE will keep it locked (when
running from IDE).
Ext. declarations for the above functions:
Function ulong LoadLibraryA (readonly string lpLibFileName) Library
"KERNEL32.DLL" // for PB9 and below
Function ulong LoadLibraryW (readonly string lpLibFileName) Library
"KERNEL32.DLL" // for PB10 and above
Function boolean FreeLibrary (ulong hLibModule) Library "KERNEL32.DLL"
Sample:
ulong ll_handle
string ls_fulldllname
ls_fulldllname = of_get_dll_name() // returns someth like "c:\temp\your.dll"
ll_handle = LoadLibraryW(ls_fulldllname)
If ll_handle <> 0 Then
// loaded; call something in the DLL
YourDllFunc() // increments DLL use counter from 1 to 2
// unload the DLL
FreeLibrary(ll_handle) //decrements the use counter from 2 to 1
Else
// No loadable DLL in ls_fulldllname
End If
Regards
On 12.01.2011 22:50, Sayed wrote:
> Hi,
> Are there any functions or a way for a Powerbuilder
> application to read a particular dll,which is not in a fixed
> location.For eg,in one laptop it might be under c:\test and
> in another laptop it can be under c:\temp.
>
> Thanks
> Sayed
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Anatoly
1/13/2011 1:23:53 PM
Hi Sayed,
If you distribute this DLL along with your application, then you can simply
put it in the application executable's folder. Another option would be, as
Chris suggested, to put it in a folder belonging to the System Path.
Anyway, you can do some preliminary checks for the availability of the DLL
before any call to an external function:
1) simply using FileExists() method. Passing only a filename (with no path)
to this method would make it search along the entire system path, not just
in your current folder.
2) here's a sample function which checks if a given method of a given DLL
file is available to your application:
External function declarations:
-----------------------------------------
FUNCTION ulong LoadLibrary (ref string lpLibFileName) Library "KERNEL32.DLL"
Alias for "LoadLibraryW"
FUNCTION boolean FreeLibrary (ulong hLibModule) Library "KERNEL32.DLL"
FUNCTION ulong GetModuleHandle(string lpModuleName) Library "KERNEL32.DLL"
Alias for "GetModuleHandleW"
FUNCTION ulong GetProcAddress(ulong hModule, string pProcName) Library
"KERNEL32.DLL" Alias for "GetProcAddress"
The source code:
------------------------
function of_get_availability(as_module_name, as_function_name) returns
boolean
ulong lul_module_handle, lul_func_address
boolean lb_loaded = FALSE // if we load the DLL, we shall unload it
// First, try to find the DLL in the memory
lul_module_handle = GetModuleHandle(as_module_name)
if ISNULL(lul_module_handle) or (lul_module_handle = 0) then
// Module not available in the memory, try to load it
lul_module_handle = LoadLibrary(as_module_name)
if ISNULL(lul_module_handle) or (lul_module_handle = 0) then return FALSE
// Module could not be loaded
lb_loaded = TRUE
end if
// Second, find the method within the DLL
lul_func_address = GetProcAddress(lul_module_handle, as_function_name)
if ISNULL(lul_func_address) or (lul_func_address = 0) then
if lb_loaded then FreeLibrary(lul_module_handle) // unload
return FALSE // Function is not found within this module
end if
// Function is found within this module
// at address lul_func_address
if lb_loaded then FreeLibrary(lul_module_handle) // unload
return TRUE
Sample usage:
---------------------
if not of_get_availability("wininet.dll", "InternetCrackUrlW") then
MessageBox("Error", "Missing WININET functionality... cannot continue!",
StopSign!)
end if
Regards,
Ivaylo
<Sayed> wrote in message news:4d2e1428.6267.1681692777@sybase.com...
> Hi,
> Are there any functions or a way for a Powerbuilder
> application to read a particular dll,which is not in a fixed
> location.For eg,in one laptop it might be under c:\test and
> in another laptop it can be under c:\temp.
>
> Thanks
> Sayed
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0 |
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Ivaylo
1/13/2011 2:10:00 PM
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