DLL function(s) problem

Simple question i have this code in an EXE:

Code:

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void foo(int var1);
void foo(int var1,int var2);

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so i can use both with the same name
how can i use this in a DLL my Qt compiler says that the 2 function confilts :confused:

there are plenty of other resources on the net available for building (c++) dlls. This is nothing to do with Qt programming.

Qt is C++ , i didn't ask for trolling i asked for advice...

Qt is not c++. Qt is a library built with c++.

This is a Qt programming forum. You have not asked a Qt programming question.

Maybe here http://www.qtcentre.org/forums/9-General-Programming is what you are looking for.

look go flame somewhere else i have a question i don't need a lecture what Qt u know I'M PROGRAMMING IN Qt do you think i don't know what it is?
you are a programmer in Qt, so rather than trollin' answer or flame another post

Well, you've posted in a wrong forum. That's it. If you're sure that's the correct place to ask then:
Did you fill HEADERS & LIBS variables for your pro-file? What's the complete error message?

Quote:

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Originally Posted by silur

look go flame somewhere else i have a question i don't need a lecture what Qt u know I'M PROGRAMMING IN Qt do you think i don't know what it is?
you are a programmer in Qt, so rather than trollin' answer or flame another post

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Since you asked so nicely, and the fact that you seem unable to find your way into the correct forum, I will advise you to read my signature.

Quote:

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Originally Posted by silur

Simple question i have this code in an EXE:

Code:

---

void foo(int var1);
void foo(int var1,int var2);

---

so i can use both with the same name
how can i use this in a DLL my Qt compiler says that the 2 function confilts :confused:

---

Firstly, there is no such beast as a Qt compiler. Your are using either a C++ or C compiler and this question has nothing to do with Qt.

Now, to address the C++ question. By way of example, this code:

Code:

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#include <stdio.h>
 
void foo(int a) { printf("A = %d\n", a); }
 
void foo(int a, int b) { printf("A = %d  B = %d\n", a, b); }
 
int main(int argc, char **argv) {
    foo(1);
    foo(2,3);
    return 0;
}

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Is perfectly valid C++, which allows overloaded functions, and compiles just fine with a C++ compiler. Despite deliberately using only C IO functions this code will not compile with a C compiler (GCC in my case), generating:

Code:

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gcc -o test main.c
main.c:7:6: error: conflicting types for ‘foo’
main.c:3:6: note: previous definition of ‘foo’ was here
main.c: In function ‘main’:
main.c:15:5: error: too few arguments to function ‘foo’
main.c:7:6: note: declared here

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You are most likely using C++ compiler, but this is still related.


Even with a C++ compiler, if you have forward declarations in the include file for your library like this:

Code:

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#ifdef __cplusplus
extern "C" {
#endif
 
void foo(int var1);
void foo(int var1,int var2);
 
#ifdef __cplusplus
}
#endif

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then you are telling the C++ compiler these are C-style declarations and it will not allow the overloaded names (just like a C compiler):

Code:

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g++ -o test test.cpp main.cpp 
In file included from main.cpp:1:0:
test.h:6:27: error: declaration of C function ‘void foo(int, int)’ conflicts with
test.h:5:6: error: previous declaration ‘void foo(int)’ here
main.cpp: In function ‘int main(int, char**)’:
main.cpp:6:10: error: too few arguments to function ‘void foo(int, int)’
test.h:6:6: note: declared here

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Exactly what you are doing we cannot tell, but this information should give you a clue.