Calling dll functions

[John]

DWORD _stdcall DLLFunction(DWORD Num, CHAR *Str);

I call the above dll function from a C++ app. Now I need to call it from my
C# app. How can I do it?

[DllImport("MyDll.dll")]
public static extern int DLLFunction(int Num, string Info);

int Num;
string Info = new string(' ', 80);
DLLFunction(Num, Info);

I cannot get anything in variable Info. Please help. Thanks.

[Sericinus hunter]

Try StringBuilder instead of string type.

John wrote:

DWORD _stdcall DLLFunction(DWORD Num, CHAR *Str);

I call the above dll function from a C++ app. Now I need to call it from my
C# app. How can I do it?

[DllImport("MyDll.dll")]
public static extern int DLLFunction(int Num, string Info);

int Num;
string Info = new string(' ', 80);
DLLFunction(Num, Info);

I cannot get anything in variable Info. Please help. Thanks.

[Mythran]

"John" <Jo**@discussions.microsoft.com> wrote in message
news:0F**********************************@microsof t.com...

DWORD _stdcall DLLFunction(DWORD Num, CHAR *Str);

I call the above dll function from a C++ app. Now I need to call it from
my
C# app. How can I do it?

[DllImport("MyDll.dll")]
public static extern int DLLFunction(int Num, string Info);

int Num;
string Info = new string(' ', 80);
DLLFunction(Num, Info);

I cannot get anything in variable Info. Please help. Thanks.

[DllImport("myDll.dll")]
public static extern int DLLFunction(out int Num, StringBuilder Info);

int Num;
string Info = new StringBuilder(80);
DLLFunction(out Num, Info);
string results = Info.ToString();

HTH,
Mythran

[sb]

btw: you don't need to declare "Num" as an out parameter unless the DLL
plans to change it.

-sb

"Mythran" <ki********@hotmail.comREMOVETRAIL> wrote in message
news:uD**************@TK2MSFTNGP05.phx.gbl...

"John" <Jo**@discussions.microsoft.com> wrote in message
news:0F**********************************@microsof t.com...

DWORD _stdcall DLLFunction(DWORD Num, CHAR *Str);

I call the above dll function from a C++ app. Now I need to call it from
my
C# app. How can I do it?

[DllImport("MyDll.dll")]
public static extern int DLLFunction(int Num, string Info);

int Num;
string Info = new string(' ', 80);
DLLFunction(Num, Info);

I cannot get anything in variable Info. Please help. Thanks.

[DllImport("myDll.dll")]
public static extern int DLLFunction(out int Num, StringBuilder Info);

int Num;
string Info = new StringBuilder(80);
DLLFunction(out Num, Info);
string results = Info.ToString();

HTH,
Mythran

[Mythran]

"sb" <st********@yahoo.com> wrote in message
news:u7**************@TK2MSFTNGP04.phx.gbl...

btw: you don't need to declare "Num" as an out parameter unless the DLL
plans to change it.

-sb

"Mythran" <ki********@hotmail.comREMOVETRAIL> wrote in message
news:uD**************@TK2MSFTNGP05.phx.gbl...

"John" <Jo**@discussions.microsoft.com> wrote in message
news:0F**********************************@microsof t.com...

DWORD _stdcall DLLFunction(DWORD Num, CHAR *Str);

I call the above dll function from a C++ app. Now I need to call it from
my
C# app. How can I do it?

[DllImport("MyDll.dll")]
public static extern int DLLFunction(int Num, string Info);

int Num;
string Info = new string(' ', 80);
DLLFunction(Num, Info);

I cannot get anything in variable Info. Please help. Thanks.

[DllImport("myDll.dll")]
public static extern int DLLFunction(out int Num, StringBuilder Info);

int Num;
string Info = new StringBuilder(80);
DLLFunction(out Num, Info);
string results = Info.ToString();

HTH,
Mythran

Well, if he compiled it as it was, he would get a compile-time error since
Num has not been initialize, which is why I set it to "out" instead...but I
should have noted that :)

Mythran