DLL trouble

**Redshrimp2021** · 08-06-2007

Hi, I am using Dev-C++ and I made my first DLL. The DLL added two numbers together and returned the sum. I tried to send a string and have it send it back but for some reason it just sends back nothing. Here's my code...

dll.cpp

Code:

char* DllClass::String(char* string)
{string = "Hello World";
return string;}

dllclient.cpp

Code:

int main()
{
char* iValue;
char* vReturn;
DllClass Value;
cin >> iValue;
vReturn = Value.Encrypt(iValue);
cout << vReturn;
system("PAUSE");
}

Keep in mind the DLL works when dealing with numbers, so I'm not sure what the problem here is... Thanks anyways.

**prog-bman** · 08-06-2007

You can't just assign a string like that. You would need to use strcpy.

**vart** · 08-06-2007

cin >> iValue;

iValue is not initialized pointer... You just asking from the cin to write the input data on some random address...

**Redshrimp2021** · 08-07-2007

Hmm I'm sorry I don't think I understand.

If you could by any chance show me the code you think I should use to get the Dll code to return the string to the exe. Thanks again :\

**swoopy** · 08-07-2007

dll.cpp

Code:

std::string DllClass::String(std::string string)
{string = "Hello World";
return string;}

dllclient.cpp

Code:

int main()
{
std::string iValue;
std::string vReturn;
DllClass Value;
cin >> iValue;
vReturn = Value.String(iValue);
cout << vReturn;
system("PAUSE");
}

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