Createwindowex Failed Error 0

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Createwindowex Example

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Createwindow Vs Createwindowex

8 down vote favorite 1 I am trying to create a simple window with C/C++ using the native Windows message queue system (without .NET). I followed the MSDN tutorial and wrote some basic code that creates an empty window: void main() { HINSTANCE hinst; HWND hwndMain; WNDCLASSEX wnd; MSG msg; hinst = GetModuleHandle( NULL ); memset( &wnd, 0, sizeof( wnd ) ); wnd.cbSize = sizeof( wnd );

Createwindowex Pinvoke

wnd.lpszClassName = "MainWClass"; wnd.lpfnWndProc = MainWProc; wnd.hInstance = hinst; int result = RegisterClassEx( &wnd ); if( !result ) { printf("RegisterClassEx error: %d\r\n", GetLastError() ); } hwndMain = CreateWindowEx ( 0, //extended styles wnd.lpszClassName, //class name "Main Window", //window name WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL | WS_MINIMIZEBOX, //style tags CW_USEDEFAULT, //horizontal position CW_USEDEFAULT, //vertical position CW_USEDEFAULT, //width CW_USEDEFAULT, //height (HWND) NULL, //parent window (HMENU) NULL, //class menu (HINSTANCE) wnd.hInstance, //some HINSTANCE pointer NULL //Create Window Data? ); if( !hwndMain ) { printf("Oh shi- %d\n", GetLastError() ); } ShowWindow( hwndMain, SW_SHOWDEFAULT ); UpdateWindow( hwndMain ); } When I run/debug the program, CreateWindowEx returns 0 which means it failed. This triggers the error message "Oh shi- [error code]". The most confusing part is that the error message prints to console: Oh shi- 0 The error code returned by GetLastError() is 0, which is ERROR_SUCCESS! I am at a total loss; what is happening? I am so confuse... P.S. I am using Visual C++ Express 2010 on Windows 7 32-bit. I have written a Windows Procedure elsewhere but it simply returns 0 for all cases. If, however, anyone wants to see it, I will be happy to show it. I have changed the Project De

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Programs & communities Students Startups Forums MSDN Subscriber downloads Sign in Search Microsoft Search Windows Dev Center Windows Dev Center Explore createwindowex error 1407 What’s new for Windows 10 Intro to Universal Windows Platform Coding challenges Develop for accessibility Build for enterprise Windows Store opportunities Docs Windows apps Get started Design and UI Develop API reference Publish Monetize http://stackoverflow.com/questions/8550679/createwindowex-function-fails-but-getlasterror-returns-error-success Promote Games Get started UI design Develop Publish Desktop Get started Design Develop API reference Test and deploy Compatibility Windows IoT Microsoft Edge Windows Holographic Downloads Samples Support Why Windows Dashboard Explore What’s new for Windows 10 Intro to Universal Windows Platform Coding challenges Develop for accessibility Build for enterprise Windows Store opportunities Docs Windows apps Get started Design and UI Develop API reference Publish Monetize Promote Games https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/a3c296ef-d194-4555-8191-cfbf0a9452db/createwindowex-returns-null-getlasterror-returns-0?forum=windowsgeneraldevelopmentissues Get started UI design Develop Publish Desktop Get started Design Develop API reference Test and deploy Compatibility Windows IoT Microsoft Edge Windows Holographic Downloads Samples Support Why Windows Dashboard Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Answered by: CreateWindowEx() returns NULL, GetLastError() returns 0??? Windows Desktop Development > General Windows Desktop Development Issues Question 1 Sign in to vote This is a DLL loaded by a host application. I've spent 6 hours trying to figure out exactly why CreateWindowEx() returns NULL and GetLastError() returns 0. I wouldn't be so concerned that I'm doing something wrong if Windows would just frickin' tell me that I'm doing something wrong... but silently failing is frustrating beyond no end!Upon being loaded, the DLL creates a suspended thread. It is expected that the host application calls MyInit() when it's ready for this thread, which then calls ResumeThread(). The thread attempts to create a message-only window ... but cannot do anything else because the window fails to be created and all other processing requires the window.What am I doing wrong? Code Snippet // mydll.cpp : Defines the entry point for the DLL application.//#include #include #include "mydll.h"HANDLE                    g_Thread = NULL;HINSTANCE   Â

topic ForumsMembersHelp Files Developer Journals Gallery Calendar Downloads Resources Store Classifieds Tracker Links Home For Beginners Articles All Articles http://www.gamedev.net/topic/502679-c-createwindowex-failed/ Post an Article Technical Game Programming General Programming Graphics Programming and Theory DirectX and XNA OpenGL and Vulkan Multiplayer and Network Programming Artificial Intelligence Math and Physics Mobile Development http://www.digitalmars.com/d/archives/digitalmars/D/learn/HWND_is_NULL_but_GetLastError_returns_0x00_17936.html Middleware, Libraries, and Tools Virtual and Augmented Reality Creative Game Design Music and Sound Visual Arts Business Breaking into the Industry Production and Management Interviews Business and Law Event error 1407 Coverage Forums All Forums Technical Game Programming General Programming Graphics Programming and Theory DirectX and XNA OpenGL & Vulkan Multiplayer and Network Programming Artificial Intelligence Math and Physics Mobile & Console Development Build Systems & Source Control Middleware, Libraries, and Tools Virtual and Augmented Reality Creative Game Design Writing For Games Music and Sound Visual Arts Gallery Business createwindowex failed error Breaking into the Industry Business & Law Production & Management Community GDNet Lounge Coding Horrors Article Writing Comments, Suggestions and Ideas Your Announcements Hobby Project Classifieds Indie Project Showcase Community Developer Journals GDNet+ Subscriptions Gallery Store Classifieds Jobs Freelancers Hobby Projects Marketplace Newsletter » Home » Forums » The Technical Side » For Beginners Chat Watched Content New Content 0 [C++] CreateWindowEx() failed... Started by emiel1, Jul 25 2008 11:20 PM Old topic! Guest, the last post of this topic is over 60 days old and at this point you may not reply in this topic. If you wish to continue this conversation start a new topic. You cannot reply to this topic 8 replies to this topic #1 emiel1 Members -Reputation: 166 Like 0Likes Like Posted 25 July 2008 - 11:20 PM Hi, I've created code to register a window class and make a window out of it. CreateWindowEx() Failed with error code (GetLastError()) 0 (ERROR_SUCCESS); What am I doing wrong? WNDCLASSEX wc; ZeroMemory(&wc, sizeof(WNDCLASSEX)); wc.cbSize = sizeof(WNDCLASSEX); wc.style = CS_HR

c++.announce c++.atl c++.beta c++.chat c++.command-line c++.dos c++.dos.16-bits c++.dos.32-bits c++.idde c++.mfc c++.rtl c++.stl c++.stl.hp c++.stl.port c++.stl.sgi c++.stlsoft c++.windows c++.windows.16-bits c++.windows.32-bits c++.wxwindows Other digitalmars.empire digitalmars.DMDScript electronics digitalmars.D.learn - HWND is NULL but GetLastError returns 0x00 Zarathustra (81/81) Oct 16 2009 I have the problem with the following code in D2: div0 (21/23) Oct 16 2009 -----BEGIN PGP SIGNED MESSAGE----- Zarathustra (51/86) Oct 17 2009 I filled out all fields of wndclassex and operands of createWindowEx exa... Zarathustra (1/1) Oct 17 2009 Ok thanks, My fault ;p Zarathustra writes: I have the problem with the following code in D2: CreateWindowEx returns NULL but I haven't got idea why? module test; import base; static import user32; static import kernel32; void MsgBox(immutable char [] o_str){ user32.messageBox(null, cast(str)o_str, cast(str)"msg", 0x0); } struct WndClassEx{ align: dword size = 0x00000030; dword style = 0x00000000; ptr wndProc = null ; dword clsExtraBytes = 0x00000000; dword wndExtraBytes = 0x00000000; ptr hInstance = null ; ptr hIcon = null ; ptr hCursor = null ; ptr hbrBackground = null ; str menuName = null ; str className = null ; ptr hIconSm = null ; } class Application{ static const ptr hInstance; static const str commandLine; static this(){ hInstance = kernel32.getModuleHandle(null); commandLine = kernel32.getCommandLine(); assert(hInstance && commandLine, "Application initialization fail"); } } extern (Windows) static dword wndProc(ptr o_hwnd, dword o_msg, dword o_wparam, dword o_lparam){ return 0; } class Window{ const ptr handle; this(){ WndClassEx wndClass; wndClass.size = 0x00000030; wndClass.wndProc = cast(ptr)&wndProc; wndClass.hInstance = kernel32.getModuleHandle(null); wndClass.className = cast(str)"clsname"; if(!user32.registerClassEx(cast(ptr)&wndClass)){ user32.messageBox(null, user32.translateErrorCode(kernel32.getLastError()), cast(str)"error", 0x00000000); assert(false, "Window class registring failed"); } handle = user32.createWindowEx( 0, wndClass.className, cast(str)"", 0x00CF0000, 0, 0, 640, 480, null, null, Application.hInstance, null ); if(handle is null){ // ERROR_SUCCESS user32.messageBox(null, user32.translateErrorCode(kernel32.getLastError()), cast(str)"error", 0x00000000); assert(handle); } user32.showWindow(handle, 0x0000000A); user32.updateWindow(handle); } } void main(){ try{ Window wnd = new Window(); } catch(Object o){ MsgBox(o.toString); } } Oct 16 2009 div0