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我正試圖創建簡單的Windows應用程序uisng WinAPi。 下面是代碼：
WinApi，不顯示按鈕
#include "stdafx.h"
#include "APIup.h"
#define MAX_LOADSTRING 100
HWND hWnd,cw13;
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
ATOM Register(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WndProc_dla13(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_APIUP, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
Register(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_APIUP));
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APIUP));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_APIUP);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
ATOM Register(HINSTANCE hInstance)
{
WNDCLASSEX cw13class;
cw13class.cbSize = sizeof(WNDCLASSEX);
cw13class.style = CS_HREDRAW | CS_VREDRAW;
cw13class.lpfnWndProc = WndProc_dla13;
cw13class.cbClsExtra = 0;
cw13class.cbWndExtra = 0;
cw13class.hInstance = hInstance;
cw13class.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APIUP));
cw13class.hCursor = LoadCursor(NULL, IDC_ARROW);
cw13class.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
cw13class.lpszMenuName = NULL;
cw13class.lpszClassName = L"13class";
cw13class.hIconSm = LoadIcon(cw13class.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&cw13class);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, 100, 100, NULL, NULL, hInstance, NULL);
cw13=CreateWindow(L"13class",L"Ćwiczenie 13",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,0,300,300,NULL,NULL,hInst,NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
case ID_32771:
ShowWindow(cw13, 1);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK WndProc_dla13 (HWND hWnd, UINT msg/*message*/, WPARAM wParam,LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
CreateWindowW(L"button", L"Beep",
WS_VISIBLE | WS_CHILD ,
20, 50, 80, 25,
cw13, (HMENU) 1, hInst, NULL);
CreateWindowW(L"button", L"Quit",
WS_VISIBLE | WS_CHILD ,
120, 50, 80, 25,
cw13, (HMENU) 2, NULL, NULL);
break;
case WM_COMMAND:
if (LOWORD(wParam) == 1) {
Beep(40, 50);
}
if (LOWORD(wParam) == 2) {
PostQuitMessage(0);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, msg, wParam, lParam);
}
return 0;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
而問題在於：當我創建窗口「cw13」它被創建和顯示時，但推按鈕not.I創建兩個單獨的WndProc功能。其他消息正確執行（如WM_QUIT），只有CreateWindowW根據WM_CREATE，女巫應創建並顯示按鈕不是。哪裏有問題？