linker error

I have such code in windows program:

Code:

switch (message)   {
case WM_PAINT:
             HDC hDC;
             PAINTSTRUCT ps;
             hDC=BeginPaint(hwnd, &ps);
                  MoveToEx(hDC, 0, 0, NULL);
                  LineTo(hDC, 50, 50);
             EndPaint(hwnd, &ps);
}

The code without MoveToEx and LineTo works, but with them it gives those errors:

C:\DOCUME~1\ANDRES~1\LOCALS~1\Temp\ccKoaaaa.o(.tex t+0x2b1) In function `Z15WindowProcedureP6HWND__jjl':

[Linker error] undefined reference to `MoveToEx@16'
[Linker error] undefined reference to `LineTo@12'

C:\DOCUME~1\ANDRES~1\LOCALS~1\Temp\ccKoaaaa.o(.tex t+0x2b1) ld returned 1 exit status

I use Dev-C++ Compiler. I have tryed other such graphic functions, but they don't work. Always the same errors. What would be wrong with it?

Link to gdi32.lib. Or probably libgdi32.a

How can I do this?

One program I know used
#pragma comment(lib,"libname")

If you mean that line, it doesn't work. I tryed it. Errors are same.

under project -> project options there is a parameters tab, and also a directories tab

you can put the linking info in those.

I am posting this because you did not use code tags on this thread. In the furture please use Code Tags. They make your code MUCH easier to read and people will be much more likely to help you if you do. And they'll be happier about helping you

For example:

Without code tags:

for(int i=0;i<5;i++)
{
cout << "No code tags are bad";
}

With Code Tags:

Code:

for(int i=0;i<5;i++)
{
     cout << "This code is easy to read";
}

This is of course a basic example...more complicated code is even easier to read with code tags than without.

I've added code tags for you this time. They can be added by putting [code] at the beginning of your code and [/code] at the end. More information on code tags may be found on the code tag post at the top of every forum. I also suggest you take a look at the board guildlines if you have not done so already.

This is a common first post mistake, just remember to use [code] tags in the future and you'll get much more help.

If this is your first time posting here the welcome, and if there's anything I can do or any questions I can answer about these forums, or anything else, please feel free and welcome to PM me.


Good Luck with your program,

Kermi3
Lead Moderator

Thank you! I succeeded compiling that file. No errors.