Stackflow成员----我是c ++ WINAPI的初学者---当我在我的第一个WIN32 GUI中编码时,出现了一些错误[输出] ---是否有任何推荐的书籍在C ++中被提升---我的代码:
#include <windows.h>
const char g_szClassName[] = ("myWindowClass");
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
switch(msg) {
case WM_CLOSE:
DestroyWindow(hwnd);
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;
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,
L"Window Registration Failed!",
L"Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
// Creating the Window
hwnd = CreateWindowEx(
WS_EX_CLIENTEDGE,
(g_szClassName),
L"The title of my window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL);
if(hwnd == NULL) {
MessageBox(NULL,
L"Window Creation Failed!",
L"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;
}
输出:
3 IntelliSense: argument of type "const char *" is incompatible with parameter of type "LPCWSTR" c:\Users\Youssef\Documents\Visual Studio 2012\Projects\Win32Project2\Win32Project2\Win32Project2.cpp 46 2 Win32Project2
2 IntelliSense: a value of type "const char *" cannot be assigned to an entity of type "LPCWSTR" c:\Users\Youssef\Documents\Visual Studio 2012\Projects\Win32Project2\Win32Project2\Win32Project2.cpp 34 19 Win32Project2
Error 1 error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source? c:\users\youssef\documents\visual studio 2012\projects\win32project2\win32project2\win32project2.cpp 65 1 Win32Project2
答案 0 :(得分:1)
您遇到的编译问题与字符串类型和Windows程序有关。
请注意,有两个字符集&#34;构建类型&#34;对于Windows程序。第一个是MBCS
,第二个是Unicode
。默认情况下(假设您使用的是Visual Studio),构建类型为Unicode
,这意味着各种Windows API函数将处理宽字符串,而不是基于char
或char
字符串。
对您的问题最简单的解决方案是对字符数组使用TCHAR
,对于要从Windows API函数发送和接收的字符串文字使用_T()
宏。这将确保您的应用程序将编译为Unicode以及MBCS(尽管MBCS程序现在在当今时代已被淘汰)。
这一行:
wc.lpszClassName = (g_szClassName);
提出了一个问题,因为您正在编译Unicode应用程序,而WNDCLASSEX
的此成员需要LPCTSTR
(指向TCHAR
的指针),而不是const char *
。
https://msdn.microsoft.com/en-us/library/windows/desktop/ms633577%28v=vs.85%29.aspx
所以对于这个问题,
const char g_szClassName[] = ("myWindowClass");
改变应该是:
#include <tchar.h> // in case it isn't included
//...
TCHAR g_szClassName[] = _T("myWindowClass");