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c++.dos.32-bits - Linking?

reply Peter Reid <Peter_member pathlink.com> writes:
I'm getting 'Symbol undefined' errors when I try to compile and I've been told
this is because of 'linking'. I don't know what linking is or how I can do it
(and searching isn't much help for me since I just get links to link pages), so
I'm rather stuck. Could someone please help?

---
Here are my errors:

hello.obj(hello)
Error 42: Symbol Undefined _LineTo 12
hello.obj(hello)
Error 42: Symbol Undefined _MoveToEx 16

---

Here is my program. This code compiled just fine in another compiler, but I
don't always have access to that one.

#include <windows.h>
#include <stdio.h>
const char g_szClassName[] = "myWindowClass";

// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_PAINT:
HDC     hDC;
PAINTSTRUCT ps;
hDC = BeginPaint(hwnd, &ps);
MoveToEx(hDC, 0, 0, NULL);
LineTo(hDC, 50, 50);
EndPaint(hwnd, &ps);
return 0;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_LBUTTONUP:
//MessageBox(NULL, "RESIZED!!!1111oneone", "Note", MB_OK);
break;
case WM_KEYDOWN:
char myString[100];
sprintf(myString, "X: %i", (int) wParam);
MessageBox(NULL, myString  , "Note", MB_OK);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;

//Step 1: Registering the Window Class
wc.cbSize        = sizeof(WNDCLASSEX);
wc.style         = 0;
wc.lpfnWndProc   = WndProc;
wc.cbClsExtra    = 0;
wc.cbWndExtra    = 0;
wc.hInstance     = hInstance;
wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName  = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

// Step 2: Creating the Window
hwnd = CreateWindowEx(
WS_EX_CLIENTEDGE,
g_szClassName,
"The title of my window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
NULL, NULL, hInstance, NULL);

if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);

// Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}

---

Thanks!
Sep 21 2004
parent reply "Walter" <newshound digitalmars.com> writes:
Those symbols are defined in \dm\lib\gdi32.lib. Adding that library file to
the command line should do the trick.

"Peter Reid" <Peter_member pathlink.com> wrote in message
news:ciqgi2$4nc$1 digitaldaemon.com...
 I'm getting 'Symbol undefined' errors when I try to compile and I've been

 this is because of 'linking'. I don't know what linking is or how I can do

 (and searching isn't much help for me since I just get links to link

 I'm rather stuck. Could someone please help?

 ---
 Here are my errors:

 hello.obj(hello)
 Error 42: Symbol Undefined _LineTo 12
 hello.obj(hello)
 Error 42: Symbol Undefined _MoveToEx 16

Sep 21 2004
parent Peter Reid <Peter_member pathlink.com> writes:
Thank you! That was just what I needed.

In article <cir5tv$1et4$1 digitaldaemon.com>, Walter says...
Those symbols are defined in \dm\lib\gdi32.lib. Adding that library file to
the command line should do the trick.

Sep 22 2004