To save time, my problem is pretty much identical to this unsolved one (http://forums.codeblocks.org/index.php?topic=8031.msg60129). I get an undefined reference when using a function from another source file, despite having a prototype included from a header file. And this is an issue with Code::Blocks. I can plug exactly the same code into Dev-C++ and it compiles perfectly, so don't tell me that I need to go and learn C++. The following source files are relevant:
main.c
#include <windows.h>
#include <stdio.h>
#include "DefaultOutput.h"
LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);
char szClassName[] = "LinampSlaveClass";
int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nCmdShow) {
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof(WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl)) return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Linamp Slave", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/********************************************************
*********************************************************
The next line is where I get the undefined reference
*********************************************************
********************************************************/
CreateDefaultOutput(); //Here's where I get the error
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0)) {
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
switch (message) { /* handle the messages */
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
DefaultOutput.c
#include "DefaultOutput.h"
#include <stdio.h>
void CreateDefaultOutput() {
printf("Here I am creating default output... or not, because I can't be called.\n");
}
DefaultOutput.h
#ifndef _DEFAULTOUTPUT_H_
#define _DEFAULTOUTPUT_H_
void CreateDefaultOutput();
#endif
I've also included the project and source files. Is there any way to get around this issue?
EDIT: I also forgot to mention that the source files are all included in my project.
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I can plug exactly the same code into Dev-C++ and it compiles perfectly, so don't tell me that I need to go and learn C++.
Why not?
You mix C and C++, that's not correct. (I don't know why Dev-C++ links them correctly, it should not, or it treats both files incorrectly as "c" or "c++"-files.
The main-file has the ending .cpp and will compiled using c++, but your second-file is a "C"-file.
"C" and "C++" do not use the same naming-scheme.
You have to declare your function as "C"-function in the header-file.
Put
#ifdef __cplusplus
extern "C"
{
#endif
#ifdef __cplusplus
}
#endif
Here's how the whole file should look like:
#ifndef _DEFAULTOUTPUT_H_
#define _DEFAULTOUTPUT_H_
#ifdef __cplusplus
extern "C"
{
#endif
void CreateDefaultOutput();
#ifdef __cplusplus
}
#endif
#endif