DLL problems
Li Ning
lining@mail.bitmate.com
Wed May 23 02:27:00 GMT 2001
Dear friends,
I have been struggled hard to make dll running but failed.
Please help.
My purpose is to trun a cygwin compiled C program into a
dll, so that I can call it from Microsoft VC or VB.
My environment is: Windows 2K server with cygwin 1.3.2-1
installed.
Following "Cygwin User's Guide" Chapter 4 "Building and
Using DLLs", I just tried a small program first:
mydll.c
---------------
int foo (int) __attribute__ ((__dllexport__));
int foo (int i){return i+1;}
---------------
mydll.def
---------------
EXPORTS
foo
---------------
Then I did the following:
gcc -c mydll.c
gcc -s -Wl,--base-file,mydll.base -o mydll.dll mydll.o -Wl,-e,_mydll_init@12
It complains:
/usr/lib/libcygwin.a(libcmain.o)(.text+0x6a):libcmain.c: undefined reference to `WinMain@16'
collect2: ld returned 1 exit status
What's rwong?
I have tried other ways to test dlls, I have added cygwin1.dll into the VC
link options to compile a small program, VC complains:
Linking...
cygwin1.dll : fatal error LNK1136: invalid or corrupt file
Error executing link.exe.
Does that mean that there is no way to let VC access cygwin programs?
I would be very appreciate if any one can provide me a complete set of
working demo program to show me the whole process to build a DLL for
Win32 / VC.
Thanks
Ning Li
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