我正在尝试在我的应用程序中使用WinAPI设置上下文菜单，但由于某种原因我没有成功。弹出菜单的代码放在WM_RBUTTONUP案例中。但是，右键单击后没有任何反应。有人能告诉我我做错了什么吗？
的.cpp：
#include "stdafx.h"
#include "Growing_children_PAWEL_MICHNA.h"
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
//TCHAR szChild1Title[MAX_LOADSTRING];
//TCHAR szChild2Title[MAX_LOADSTRING];
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
TCHAR szChild1WindowClass[MAX_LOADSTRING];
TCHAR szChild2WindowClass[MAX_LOADSTRING];
HWND hWnd, child1hWnd, child2hWnd;
HMENU hMenu = LoadMenu(hInst, MAKEINTRESOURCE(IDR_CONTEXT_MENU));
int mywidth = 25;
int myheight = 25;
bool greater = true;
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
ATOM Child1RegisterClass(HINSTANCE hInstance);
ATOM Child2RegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(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);
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, NULL, MAX_LOADSTRING);
LoadString(hInstance, IDC_GROWING_CHILDREN_PAWEL_MICHNA, szWindowClass, MAX_LOADSTRING);
LoadString(hInstance, IDC_CHILD1, szChild1WindowClass, MAX_LOADSTRING);
LoadString(hInstance, IDC_CHILD2, szChild2WindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
Child1RegisterClass(hInstance);
Child2RegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_GROWING_CHILDREN_PAWEL_MICHNA));
// 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;
HBRUSH redBrush = CreateSolidBrush(RGB(255, 0, 0));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = NULL; //CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GROWING_CHILDREN_PAWEL_MICHNA));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = redBrush;
wcex.lpszMenuName = MAKEINTRESOURCE(NULL);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
ATOM Child1RegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
HBRUSH blueBrush = CreateSolidBrush(RGB(0, 0, 255));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_PARENTDC; //CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GROWING_CHILDREN_PAWEL_MICHNA));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = blueBrush;
wcex.lpszMenuName = MAKEINTRESOURCE(NULL);
wcex.lpszClassName = szChild1WindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
ATOM Child2RegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
HBRUSH greenBrush = CreateSolidBrush(RGB(0, 255, 0));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_PARENTDC; //CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GROWING_CHILDREN_PAWEL_MICHNA));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = greenBrush;
wcex.lpszMenuName = MAKEINTRESOURCE(NULL);
wcex.lpszClassName = szChild2WindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED, szWindowClass, NULL, WS_POPUPWINDOW, CW_USEDEFAULT, 0, 500, 500, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
// Set windows transparency to 70%
SetLayeredWindowAttributes(hWnd, 0, (255 * 70) / 100, LWA_ALPHA);
RECT rc;
// get the center of the work area of the system
SystemParametersInfo(SPI_GETWORKAREA, 0, &rc, 0);
int centerX = (rc.left + rc.right + 1) / 2;
int centerY = (rc.top + rc.bottom + 1) / 2;
//move the main windows to the center
MoveWindow(hWnd, centerX-250, centerY-250, 500, 500, true);
child1hWnd = CreateWindow(szChild1WindowClass, NULL, WS_CHILD, 0, 0, 25, 25, hWnd, NULL, hInstance, NULL);
SetLayeredWindowAttributes(child1hWnd, 0, (255 * 70) / 100, LWA_ALPHA);
child2hWnd = CreateWindow(szChild2WindowClass, NULL, WS_CHILD, 475, 476, 25, 25, hWnd, NULL, hInstance, NULL);
SetLayeredWindowAttributes(child2hWnd, 0, (255 * 70) / 100, LWA_ALPHA);
ShowWindow(hWnd, nCmdShow);
ShowWindow(child1hWnd, nCmdShow);
ShowWindow(child2hWnd, nCmdShow);
UpdateWindow(hWnd);
UpdateWindow(child1hWnd);
UpdateWindow(child2hWnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
POINT point;
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;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_CREATE:
{
SetTimer(hWnd, 1, 100, NULL);
return 0;
}
break;
case WM_RBUTTONUP:
{
point.x = LOWORD(lParam);
point.y = HIWORD(lParam);
ClientToScreen(hWnd, &point);
TrackPopupMenu(hMenu, TPM_RIGHTBUTTON, point.x, point.y, 0, hWnd, NULL);
return 0;
}
case WM_TIMER:
if(mywidth < 250 && greater == true)
{
MoveWindow(child1hWnd, 0, 0, ++mywidth, ++myheight, true);
MoveWindow(child2hWnd, 500-mywidth, 500-myheight, mywidth, myheight, true);
if(mywidth == 250)
greater = false;
}
else
{
MoveWindow(child1hWnd, 0, 0, --mywidth, --myheight, true);
MoveWindow(child2hWnd, 500-mywidth, 500-myheight, mywidth, myheight, true);
if(mywidth == 0)
greater = true;
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_NCHITTEST:
if (hWnd == child1hWnd || hWnd == child2hWnd) return HTTRANSPARENT;
return HTCAPTION;
break;
default:
return DefWindowProc(hWnd, message, 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;
}
.rc片段：
IDR_CONTEXT_MENU MENU
BEGIN
MENUITEM "Color", ID_COLOR32778
POPUP "Figures"
BEGIN
MENUITEM "None", ID_FIGURES_NONE, CHECKED
MENUITEM "Square", ID_FIGURES_SQUARE
MENUITEM "Triangle", ID_FIGURES_TRIANGLE
MENUITEM "Circle", ID_FIGURES_CIRCLE
END
MENUITEM "Exit", ID_EXIT
END
答案 0 :(得分：1)
您的hMenu是一个静态变量，在hInst具有值之前加载。我认为LoadMenu电话失败了。
您还会在TrackPopupMenu documentation中注意到，不仅可以使用任何菜单句柄，它还必须是弹出菜单句柄。在资源中，为顶级菜单创建一个元素，并将弹出菜单放在其下面;然后使用LoadMenu加载顶级，并使用GetSubMenu来获取下拉列表的句柄。