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what is wrong with this

gs
I want to pass a string array to C which uses ansi

in a test, I tried:
unsafe public int ctstAny1dp(Stri ng*[] strOut)
{
private string[] strMyC = {
"abcdef string 1",
"abcdef string 2",
"abcdef string 3",
"abcdef string 4",
"abcdef string 5"},
str2 = { "str2_1", "str2 2" };
// the above will be replaced by some other processing in production

// can't implicitly convert: strOut = strMyC;
for (int i = 0; i < strMyC.GetUpper Bound(0); i++)
{
strOut[i] =
((Marshal.Strin gToHGlobalAnsi( strMyC[i])).ToPointer()) ; };
return strMyC.GetUpper Bound(0) + 1;
}

the above won't compile: Error 1 Cannot implicitly convert type 'void*' to
'string*'. An explicit conversion exists (are you missing a cast?)
D:\data\Ieproj\ dotnet\IeString Class\C#\ieStri ngCS\ieStringCS \ieString.cs 99
26 ieStringCS
I thought I am getting a pointer to the string.

Is there a better way
May 19 '06 #1
5 1447
> strOut[i] =
((Marshal.Strin gToHGlobalAnsi( strMyC[i])).ToPointer()) ; };


This:

((Marshal.Strin gToHGlobalAnsi( strMyC[i])).ToPointer()) ;

returns a void* , you need to cast it to String*
May 19 '06 #2
gs
Thx
but if I do this
strOut[i] = (String*)
((Marshal.Strin gToHGlobalAnsi( strMyC[i])).ToPointer()) ;

I get
Error 1 Cannot take the address of, get the size of, or declare a pointer to
a managed type ('string')
D:\data\Ieproj\ dotnet\IeString Class\C#\ieStri ngCS\ieStringCS \ieString.cs 100
26 ieStringCS

"PIEBALD" <PI*****@discus sions.microsoft .com> wrote in message
news:68******** *************** ***********@mic rosoft.com...
strOut[i] =
((Marshal.Strin gToHGlobalAnsi( strMyC[i])).ToPointer()) ; };


This:

((Marshal.Strin gToHGlobalAnsi( strMyC[i])).ToPointer()) ;

returns a void* , you need to cast it to String*

May 20 '06 #3
Then you'll need someone better at it than I. Chances are you shouldn't be
producing an array of string pointers.

What is it you're trying to accomplish anyway?
May 22 '06 #4
gs
I am just trying to find a way to pass via com interface to native
application caller a string array.

The desired native calling protocol is
// setup and connect muyoleobj to the c# com class..
// ...
string [] mystrArray[]
myoleobj.ctstAn y1dp(mystrArray )

"PIEBALD" <PI*****@discus sions.microsoft .com> wrote in message
news:16******** *************** ***********@mic rosoft.com...
Then you'll need someone better at it than I. Chances are you shouldn't be
producing an array of string pointers.

What is it you're trying to accomplish anyway?

May 22 '06 #5
Well I don't do COM, but I expect what you want is one method that handles
both the converting and the calling.
May 22 '06 #6

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