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hello everyone,
I can create a new Win32 application and compile it, but when I come back later and try to alter the .cpp file, I get two linker errors, that I have no idea on how to fix. They state
Linking...
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/simplew.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Does anyone have any idea on how to remedy this problem :confused:
thank you to any repliers.
Okay, you're not handling the WM_DESTROY message. Your program is still running even when you've "closed" the window.
-Okay, try running the already compiled exe
-"Close" the window
-hit ctrl-alt-del and look at what programs are running
-Chances are, yours is still there
handle the WM_DESTROY message with the PostQuitMessage function (parameter 0) to exit the message loop and exit the program.
Does this help?
--Garfield the Pianist
thanks for your help, but I definately always make my Win32 applications with the WM_DESTROY in the Message handler. I still have no idea on how why I am recieving these linker errors (there are no compile errors). I am thinking of re-installing VC++ although I doubt that will achieve anything.
Did you do what I said? Did you see if your program was still running? I just recently had that same exact error.
What else you could do:
-study your WM_DESTROY message and make sure that it is doing the right code to exit the message loop or the program is still going to run.
Post and/or attach your code and I'll test it on my computer.
--Garfield the Programmer
Make sure you have '/subsystem:windows' in your linker options.
Flucas, is this your first Win32 program with MSVC? Because zen could be right if no other program is working.
I thought you meant that it wasn't the first time, and it was your code. Sorry for the misunderstanding.
--Garfield
I had a simmilar problem doing a tutorial one time. My program wouldn't link in a project that I started as a win32 console app, had to use the regular win32 app project type, kinda sucks cause I had been using the console window to output values of different parameters to see what was going on behind the scenes.
argh!!! I tried everyone's suggestions but I still can't seem to combat the problem. Everytime I wanna compile my project I have to start a NEW Win32 Application project in VC++. Worst thing is that I'm only a beginner with Windows Programming so I have no idea how to fix the problem.
Garfield, I did try your Idea to check if the prog was still running, it wasn't so its definately not the WM_DESTROY causing the trouble.
I have 2 computers (with VC++ on both) and they both have the same linker problems. Does anyone have anymore Ideas as to why this is happening? Any help would be greatly appreciated :)
- Paul Lucas
Try clicking the build menu, then Clean, see if you can link then.
or Try doing a Console win32 App project, maybe it's the exact opposite of the problem I had.
How are you declaring your winmain()?
The linker error 2001 usually means there is no 'main' function though one is called but does not exist. (Look for the 'main() undeclared assuming external returning int' warning ) Why it works first time I don't know. If you reset the PC in between runs does the problem fix itself?
My WinMain() is
int PASCAL WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpszCmdLine, int nCmdShow)
Your linker expects to see a main function. If you do Win32 programming, there is no main function as in Console programming. The easiest way is: Make a new empty Win32 Project, copy your files, include them into the project ( add files somewhere in the project menu ) and save this.
Hey Zen,
thanks alot for your tip, u have cured the problem... thanks!!
I just had this same problem and cutting and pasting into a new project worked for me too. In my case I believe it comes from going straight to the c++ source file instead of creating a workspace first.
Anyway, that is my hypothesis when I create apps. by first creating the project workspace this error doesn't occur.