LoadLibrary return..

This is a discussion on LoadLibrary return.. within the C++ Programming forums, part of the General Programming Boards category; Hi ppl, i'm new here and this is my first post. I got this code and it works fine! It ...

  1. #1
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    Jun 2008
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    Brazil
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    Question LoadLibrary return..

    Hi ppl, i'm new here and this is my first post.

    I got this code and it works fine! It just set "myprinter" as default printer.

    Code:
    HINSTANCE lib;
    	lib = LoadLibrary("printui.dll");
    	if ( lib == NULL ) {
    		printf("%s\n", "printui.dll");
    		return 0;
    	}
    	LPFUNC PrintUIEntry;
    	PrintUIEntry = (LPFUNC)GetProcAddress(lib, "PrintUIEntryW");
    	if ( PrintUIEntry == NULL ) {
    		FreeLibrary( lib );
    		printf("%s\n", "PrintUIEntry");
    		return 0;
    	}
    	_bstr_t bstrParam;
    	bstrParam = " /y /n \"myprinter\"";
    
    	PrintUIEntry(
    		GetDesktopWindow(),
    		lib,
    		(wchar_t *)bstrParam,
    		SW_SHOW
    	);
    	
    	FreeLibrary( lib );
    But i need to know if it worked. I need an exit code, or boolean response.

    Someone knows how to retrieve it?

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
    Join Date
    Oct 2007
    Posts
    22,455
    I can't find the function PrintUIEntry at MSDN, but I'd expect it to return something, so check for return after calling your function pointer.

    T ret = PrintUIEntry(
    GetDesktopWindow(),
    lib,
    (wchar_t *)bstrParam,
    SW_SHOW
    );
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
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    Brazil
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    Thumbs up

    I can't find either. But I solved it this morning.
    I missed a part of my code:

    typedef void (__stdcall *LPFUNC)
    (
    HWND hwnd,
    HINSTANCE hinst,
    LPWSTR lpszCmdLine,
    int nCmdShow
    );
    Well, a void will never return any value, right?

    then... I changed:

    typedef int (__stdcall *LPFUNC)
    (
    HWND hwnd,
    HINSTANCE hinst,
    LPWSTR lpszCmdLine,
    int nCmdShow
    );
    And, works fine:

    int ret = PrintUIEntry(
    GetDesktopWindow(),
    lib,
    (wchar_t *)bstrParam,
    SW_SHOW
    );
    Sorry about my mistake.

    Tks for your help!

    Raphael

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