How to use external dll function

[mtheriault2000]

Hi

A GlobalVariable.dll as been created to exchange information between a trading software and the external word.

Function like GVSetString is available:
GVSetString( NewGlobalString, "This string will be strore in the NewGlobalString variable")

What is the process to get access to an external dll.
The file is :C\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll

Again any help appreciated because I'm

Martin

 

[Jaafar Tribak]

Rorya, Indeed, I had an error in the addressing. The file was on to places on the disk

Now, my new error message is translated by:

Error 49: DLL calling convention erroneus

Public DLLString  As String
Public Val As Integer

Option Explicit



Declare Function GV_GetInteger Lib "C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" (ByVal Val As Integer)
Declare Function GV_GetString Lib "C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" (ByVal Val As Integer)
'


Sub UseGlobalVariable()
Dim Price As Double
Dim string2 As String
Dim va
Price = Price + 1

Price = GV_GetInteger(Val)
string2 = GV_GetString(3)
End Sub

Martin

Also,notice that in your declaration, you are not designating a Function return. I see your expecting a string so I suspect the API should return a Long pointer to the string.

Maybe something along these lines :
Declare Function GV_GetString Lib "C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" (ByVal Val As Integer)As Long

If , after adding the above function return you don't get the calling convetion error anymore then the next step is to extract the actual string from its returned pointer.

 

[mtheriault2000]

Is it COM visible?

Hello Sector

I can't say, I'm "ignorant" on the subject

How can i know? I will try to acquire, learn information on the subject

Martin

 

[Sektor]

Is it created in .NET Framework?

 

[mtheriault2000]

Also,notice that in your declaration, you are not designating a Function return. I see your expecting a string so I suspect the API should return a Long pointer to the string.

Maybe something along these lines :
Declare Function GV_GetString Lib "C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" (ByVal Val As Integer)As Long

If , after adding the above function return you don't get the calling convetion error anymore then the next step is to extract the actual string from its returned pointer.

Hi Jaafar Tripak

I will look at your suggestion.

Wow, this dll calling, addressing confuse me a lot. I never work with that before. I will need to read more about it because honestly I don't understand what I'm doing and what i should look for.

So basically, I should at least understand a bit on the matter before asking question because more questions confuse me more.

Martin

 

[Jaafar Tribak]

Martin .

Try this and tell us if you get an error and if so which error .

Public DLLString  As String
Public Val As Integer

Option Explicit



Declare Function GV_GetString Lib _
"C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" _
(ByVal Val As Integer) As Long
'


Sub UseGlobalVariable()
Dim Price As Double
Dim string2 As String
Dim va
Price = Price + 1

string2 = GV_GetString(3)
End Sub

 

[Jaafar Tribak]

Also try like the above but with this declaration :

Declare Function GV_GetString Lib _
"C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" _
(ByVal Val [B][COLOR=Red]As Long[/COLOR][/B]) As Long

 

[RoryA]

A quick Google suggests:

Private Declare Function GV_GetInteger Lib "C:\Program Files (x86)\TS Support\MultiCharts\GlobalVariable.dll" (ByVal intElementLoc As Long) As Long

for the first one.

 

[mtheriault2000]

OK Rorya WIll look at your last post.

Martin