Error C2664 Cwnd Messageboxw
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Cannot Convert From 'const Char [14]' To 'lpcwstr'
Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of cannot convert parameter 1 from 'const char *' to 'lpcwstr' 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Cannot convert parameter from 'const char[20]' to 'LPCWSTR' up vote 2 down vote favorite 1 When compiling this
Const Char To Lpcwstr
code: #include
Cannot Convert From Char* To Lpcwstr
= "myWindowClass"; // Step 4: the
Const Char Is Incompatible With Lpcwstr
Window Procedure LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, cannot convert from const char to char LPARAM lParam) { switch(msg) { case WM_CLOSE: DestroyWindow(hwnd); break; case WM_DESTROY: PostQuitMessage(0); break; default: return http://stackoverflow.com/questions/5481378/cannot-convert-parameter-from-const-char20-to-lpcwstr 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 http://www.cplusplus.com/forum/windows/2359/ = 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)) { MessageBoxA(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) { MessageBoxA(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK); return 0; } ShowWindow(hwnd, nCmdShow
MessageBox("Hello. This is my first visual C++ Application!"); } and when i build http://www.cplusplus.com/forum/windows/45228/ the program i get this error: Error 1 error C2664: http://m.blog.csdn.net/article/details?id=47083265 'CWnd::MessageBoxW' : cannot convert parameter 1 from 'const char [48]' to 'LPCTSTR' c:\documents and settings\kokolade\desktop\my_test\test\test\testdlg.cpp 160 1 test i will be glad if someone can point me in the right direction thanks Jun 21, 2011 at 3:28pm UTC methodos (60) You const char should add the letter 'L' before anything between quotation marks. That converts the constant string to LPCTSTR (Long Pointer to Constant T (meaning char* or wchar_t* depending on whether UNICODE is defined) STRing): MessageBox(L"Hello. This is my first visual C++ Application!"); See: http://social.msdn.microsoft.com/Forums/en-US/vclanguage/thread/1b994ff3-da28-46a8-90ef-6c7fab8dcd21/ Last edited on Jun 21, 2011 at 3:35pm UTC cannot convert from Jun 21, 2011 at 4:42pm UTC webJose (2948) Sorry, but wrong. In Disch's words: There are 3 message box functions: MessageBoxA, MessageBoxW, and MessageBox, and they all take 3 different types of string datatypes. -MessageBox: Takes LPCTSTR, which is a pointer to const TCHAR. -MessageBoxA: Takes LPCSTR, which is a pointer to const char. -MessageBoxW: Takes LPCWSTR, which is a pointer to const wchar_t. Therefore, saying "Use MessageBox() with a const wide char string" is just wrong. You can do either of the following: 1
2
3
MessageBox(TEXT("Hello"), ...); MessageBoxA("Hello", ...); MessageBoxW(L"Hello", ...); Any other combination is just wrong in Disch's eyes. In mine kind of. I would accept MessageBox(L"Hello", ...); if surrounded by #ifdef _UNICODE ... #endif . Topic archived. No new replies allowed. C++ Information Tutorials Reference Articles Forum Forum BeginnersWindows ProgrammingUNIX/Linux ProgrammingGeneral C++ ProgrammingLoungeJobs Home page | Privacy policy© cplusplus.com, 2000-2016 - All rights reserved - v3.1Spotted an error? contact us
C2664: 'CWnd::MessageBoxW' : cannot convert parameter 1 from 'char *' to 'LPCTSTR' 后来发现解决方法很简单，点击“项目”-》“属性”-》“配置属性”-》“常规”-》“字符集”选择“使用多字节字符集” 问题解决，后来发现很多问题都能通过这个办法解决，如： error C2440: '=' : cannot convert from 'const char [13]' to 'LPCWSTR'。 等问题都能用该方法解决。 vs 2010英文版下： Change your project configuration to use multibyte strings. Press ALT+F7 to open the properties, and navigate to Configuration Properties > General. Switch Character Set to "Use Multi-Byte Character Set". 上一篇 下一篇 暂无评论，我去发表~ 评论（0） c语言,color,微软,visual studio 2005,class,mfc 我的热门文章 用VC++6.0上位机程序控制步进电机 基于Opencv的车辆识别系统研究 OpenCV 透视变换【图像归一化矫正】 更改Visual Studio 2010的主题设置[.vssettings格式] 学习java书籍 相关博文 未登录 •首页 •移动开发 •Web前端 •架构设计 •编程语言 •互联网 •数据库 •系统运维 •云计算 •研发管理 •综合 0 0 0 分享 微信分享新浪微博QQ好友QQ空间 取 消