Unresolved External

This is a discussion on Unresolved External within the Windows Programming forums, part of the Platform Specific Boards category; If you read my post "Tga" earlier about the image library i am creating that relates to this post as ...

  1. #1
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    Join Date
    Dec 2004
    Posts
    73

    Unresolved External

    If you read my post "Tga" earlier about the image library i am creating that relates to this post as well. This time I am having a problem somewhere that I can't find. The two errors I get are both Unresolved External errors for the function DBIL_Initialize() and the function DBIL_DeInitialize() because those are the only two I'm calling from the DLL. Here is my code, please help.

    "Main.h" (Where I import from DLL)
    Code:
    #include <windows.h>
    #include <ddraw.h>
    
    #define DLLEXP __declspec(dllexport)
    
    #pragma comment(lib,"ddraw.lib")
    #pragma comment(lib,"dxguid.lib")
    
    #define g_szClassName "CLASS!"
    
    // Image Types For DBIL_LoadImage() Function
    #define BITMAP_IMAGE_FILE 0x00AA
    #define TARGA_IMAGE_FILE 0x00BB
    
    // Methods Of Display For DBIL_DisplayImage() Function
    #define NORMAL_IMAGE 0x00AAAA
    #define TRANSPARENT_IMAGE 0x00AABB
    #define BACKGROUND_IMAGE 0x00AACC
    #define PORTION_IMAGE 0x00AADD
    
    enum
    {
    	ePrimary,
    	eBack,
    	eMaxSurfaces,
    };
    
    typedef struct
    {
        BYTE IDLength;
        BYTE ColorMapType;
        BYTE ImageType;
        WORD CMapStart;
        WORD CMapLength;
        BYTE CMapDepth;
        WORD XOffset;
        WORD YOffset;
        WORD Width;
        WORD Height;
        BYTE PixelDepth;
        BYTE ImageDescriptor;
    } TGA_Header;
    
    typedef struct
    {
        HWND hWnd;
        RECT Rect;
        HANDLE Compatible;
        HANDLE Old;
        HDC Front;
        HDC Back;
        HDC Bitmap;
    } BUFFER;
    
    typedef struct
    {
    	LPDIRECTDRAW2 Interface;
    	LPDIRECTDRAWSURFACE Surfaces[eMaxSurfaces];
    	LPDIRECTDRAWCLIPPER Clipper;
    } TRANS_IMAGE;
    
    LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
    
    DLLEXP HBITMAP DBIL_LoadImage(HINSTANCE, LPSTR, UINT, UINT);
    DLLEXP bool DBIL_Initialize(BUFFER, TRANS_IMAGE, HWND);
    DLLEXP bool DBIL_DisplayImage(BUFFER, HBITMAP, UINT, INT, INT, RECT, TRANS_IMAGE);
    DLLEXP bool DBIL_DeInitialize(BUFFER, TRANS_IMAGE);
    DLLEXP bool DBIL_ClearScreen(HDC, RECT, INT);
    "Main.cpp" (I'm just posting where I have the problem)
    Code:
    #include "Main.h"
    ...........................
    
    case WM_CREATE:
    	DBIL_Initialize(pBuffer, pTrans, hWnd);
    	break;
    
    ...........................
    
    case WM_DESTROY:
    	DBIL_DeInitialize(pBuffer, pTrans);
            PostQuitMessage(0);
    	break;
    
    ...........................
    Last edited by ElWhapo; 05-07-2005 at 11:41 PM.

  2. #2
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    California
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    You need to link to the DLL in order to call its functions, or use LoadLibrary() and GetProcAddress().

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