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POWin32 Static Variable link error
 

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    <p>Why does this happen?</p> <blockquote> <p>1>------ Build started: Project: Client, Configuration: Debug Win32 ------<br> 1> WindowManager.cpp<br> 1> Generating Code...<br> 1> Compiling...<br> 1> Main.cpp<br> 1> Generating Code...<br> 1>WindowManager.obj : error LNK2001: unresolved external symbol<br> "private: static int WindowManager::win_stat" (?win_stat@WindowManager@@0HA) 1>C:\Users\user\documents\visual studio 2012\Projects\TalkToMe\Debug\Client.exe : fatal error LNK1120: 1 unresolved externals<br> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========</p> </blockquote> <p>WindowManager.cpp</p> <pre><code>#include "WindowManager.h" void WindowManager::PekMessage() { if(PeekMessage(&amp;msg, window, 0, 0, PM_REMOVE)) { TranslateMessage(&amp;msg); DispatchMessage(&amp;msg); } } bool WindowManager::isWindowOpen() { return win_stat != -1; } HWND WindowManager::textbox(int width, int height, int xPos, int yPos, LPCSTR content, bool edit_able) { int type = (edit_able) ? (WS_CHILD|WS_VISIBLE|ES_AUTOHSCROLL) : (WS_CHILD|WS_VISIBLE|WS_HSCROLL|ES_AUTOHSCROLL); return CreateWindowEx( WS_EX_CLIENTEDGE, "EDIT", content, type, xPos, yPos, width, height, window, (HMENU)50, GetModuleHandle(NULL), NULL ); } HWND WindowManager::textbox(Vector size, Vector position, LPCSTR content, bool edit_able) { return textbox(size.getX(), size.getY(), position.getX(), position.getY(), content, edit_able); } LRESULT CALLBACK WindowManager::WindowProcedure(HWND winhan,UINT uint_Message,WPARAM parameter1,LPARAM parameter2) { switch(uint_Message) { case 16: // exit button win_stat = -1; break; } return DefWindowProc(winhan,uint_Message,parameter1,parameter2); } WindowManager::WindowManager(LPCTSTR title,int x, int y, int width, int height) { WNDCLASSEX wnd; wnd.cbSize = sizeof(wnd); wnd.style = CS_HREDRAW | CS_VREDRAW; wnd.lpfnWndProc = WindowProcedure; wnd.cbClsExtra = 0; wnd.cbWndExtra = 0; wnd.hInstance = GetModuleHandle(NULL); wnd.hIcon = NULL; wnd.hCursor = LoadCursor(NULL,IDC_ARROW); wnd.hbrBackground = GetSysColorBrush(NULL); wnd.lpszClassName = "TalkToMe"; wnd.lpszMenuName = NULL; wnd.hIconSm = LoadIcon(NULL, IDI_APPLICATION); RegisterClassEx(&amp;wnd); window = CreateWindowEx(WS_EX_CONTROLPARENT, wnd.lpszClassName, title, WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_VISIBLE, x, y, width, height,NULL, NULL, GetModuleHandle(NULL), NULL); } WindowManager::~WindowManager() { DestroyWindow(window); } </code></pre> <p>WindowManager.h</p> <pre><code>#pragma once #pragma comment(linker,"\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"") #include &lt;Windows.h&gt; #include "Vector.h" class WindowManager { private: MSG msg; HWND window; static int win_stat; public: WindowManager(LPCTSTR title,int x, int y, int width, int height); ~WindowManager(); static LRESULT CALLBACK WindowProcedure(HWND winhan,UINT uint_Message,WPARAM parameter1,LPARAM parameter2); HWND textbox(int width, int height, int xPos, int yPos, LPCSTR content, bool edit_able=true); HWND textbox(Vector size, Vector position, LPCSTR content, bool edit_able=true); bool isWindowOpen(); void PekMessage(); }; </code></pre>
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    1. CODuplicate: http://stackoverflow.com/questions/195207/unresolved-external-symbol-on-static-class-members
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