[英]HWND address changes when used for a parameter from inside its windproc
我試圖創建一個函數createscalingwindow
,該函數調用CreateWindowEx
並將CreateWindowEx
使用的HWND的地址寫入向量,然后是其初始大小和位置值。
我做的另一個函數叫做scalewindowsize
,應該采用兩個給定的窗口,並用另一個窗口縮放一個窗口的大小,但此刻我什至無法匹配某些HWND的地址,因為在某些條件下,傳遞給scalewindowsize
HWND的地址會匹配與初始化時的地址完全不同。 僅當我從窗口過程調用scalewindowsize
時,才在窗口過程的參數中使用與scalewindowsize
參數中使用的HWND相同的HWND。 下面是相關代碼:
#include <windows.h>
#include <stdio.h>
#include <winsock.h>
#include <vector>
#define ID_1 1000
#define ID_2 1001
#define ID_3 1002
HWND mainwin;
HWND lobbywin;
int zero = 0;
char MENU1;
std::vector<intptr_t> sizevalues;
LRESULT CALLBACK mainproc (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK lobbyproc (HWND, UINT, WPARAM, LPARAM);
char mainclassname[] = "main";
char lobbyclassname[] = "lobby";
void createscalingwindow(HWND &cswpara0,DWORD cswpara1,const CHAR* cswpara2,
const CHAR* cswpara3,DWORD cswpara4,int cswpara5,int cswpara6,int cswpara7,
int cswpara8,HWND cswpara9,HMENU cswpara10,HINSTANCE cswpara11,LPVOID cswpara12)
{
cswpara0 = CreateWindowEx (cswpara1, cswpara2, cswpara3, cswpara4,cswpara5,
cswpara6,cswpara7,cswpara8,cswpara9,cswpara10,cswpara11,cswpara12);
char buffer[100];
sizevalues.push_back((intptr_t)&cswpara0);
snprintf (buffer, 20,"%d", sizevalues[zero]);
MessageBox (NULL, buffer, "initialized", NULL);
zero = (zero + 1);
return;
}
void scalewindowsize (HWND &ownerwin, const CHAR* tryz)
{
char buffer[100];
int checknumber = 0;
while (checknumber < sizevalues.size())
{
int compare = sizevalues[checknumber];
if (sizevalues[checknumber] == (intptr_t)&ownerwin)
{
snprintf (buffer, 100,"%d", (intptr_t)&ownerwin);
MessageBox (NULL, buffer, "value found", NULL);
break;
}
else
{
snprintf (buffer, 100,"%d", (intptr_t)&ownerwin);
MessageBox (NULL, buffer, tryz, NULL);
snprintf (buffer, 100,"%d", sizevalues[checknumber]);
checknumber = (checknumber + 1);
MessageBox (NULL, buffer, "fail currentcheck", NULL);
}
}
return;
}
int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance,
LPSTR lpszArgument, int nCmdShow)
{
MSG messages;
WNDCLASSEX mainwinclass;
mainwinclass.hInstance = hThisInstance;
mainwinclass.lpszClassName = mainclassname;
mainwinclass.lpfnWndProc = mainproc;
mainwinclass.style = CS_DBLCLKS;
mainwinclass.cbSize = sizeof (WNDCLASSEX);
mainwinclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
mainwinclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
mainwinclass.hCursor = LoadCursor (NULL, IDC_ARROW);
mainwinclass.lpszMenuName = NULL;
mainwinclass.cbClsExtra = 0;
mainwinclass.cbWndExtra = 0;
mainwinclass.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
if (!RegisterClassEx (&mainwinclass))
return 0;
WNDCLASSEX lobbywinclass;
lobbywinclass.hInstance = hThisInstance;
lobbywinclass.lpszClassName = lobbyclassname;
lobbywinclass.lpfnWndProc = lobbyproc;
lobbywinclass.style = CS_DBLCLKS;
lobbywinclass.cbSize = sizeof (WNDCLASSEX);
lobbywinclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
lobbywinclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
lobbywinclass.hCursor = LoadCursor (NULL, IDC_ARROW);
lobbywinclass.lpszMenuName = NULL;
lobbywinclass.cbClsExtra = 0;
lobbywinclass.cbWndExtra = 0;
lobbywinclass.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
if (!RegisterClassEx (&lobbywinclass))
return 0;
HMENU playmenu = CreateMenu();
HMENU playmenulist = CreatePopupMenu();
HMENU helpmenulist = CreatePopupMenu();
AppendMenu(playmenulist, MF_STRING, ID_1, "Join game");
AppendMenu(playmenulist, MF_STRING, ID_3, "Host game");
AppendMenu(playmenulist, MF_STRING, ID_2, "Quit");
InsertMenu(playmenu, 1, MF_POPUP|MF_BYPOSITION, (UINT_PTR)playmenulist, "Play");
createscalingwindow(mainwin, 0, mainclassname, "mainwindow",
WS_OVERLAPPED|WS_CAPTION|WS_THICKFRAME|WS_MINIMIZEBOX|WS_MAXIMIZEBOX|WS_SYSMENU,
CW_USEDEFAULT, CW_USEDEFAULT, 544, 375, NULL, playmenu, hThisInstance, NULL);
ShowWindow (mainwin, nCmdShow);
createscalingwindow(lobbywin, 0, lobbyclassname, "Lobby", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 600, 425, NULL, NULL, hThisInstance, NULL);
while (GetMessage (&messages, NULL, 0, 0))
{
TranslateMessage(&messages);
DispatchMessage(&messages);
}
return messages.wParam;
}
LRESULT CALLBACK mainproc(HWND mainwin, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_SIZE:
{
scalewindowsize (mainwin, "mainwin");
scalewindowsize (lobbywin, "lobbywin");
break;
}
case WM_DESTROY:
PostQuitMessage(0);
break;
}
switch (wParam)
{
case ID_3:
EnableWindow (mainwin, false);
ShowWindow (mainwin, false);
ShowWindow (lobbywin, true);
break;
default:
return DefWindowProc (mainwin, message, wParam, lParam);
break;
}
return 0;
}
LRESULT CALLBACK lobbyproc(HWND lobbywin, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_SIZE:
{
scalewindowsize (mainwin, "mainwin");
scalewindowsize (lobbywin, "lobbywin");
break;
}
break;
}
switch (wParam)
{
case SC_CLOSE:
{
EnableWindow (mainwin, true);
ShowWindow (mainwin, true);
ShowWindow (lobbywin, false);
EnableWindow (lobbywin, false);
break;
}
default:
return DefWindowProc (lobbywin, message, wParam, lParam);
break;
}
}
如果我運行此程序,請單擊主機游戲,返回到主窗口並稍加調整大小(在mainrpoc中設置大小寫為WM_SIZE :),然后退出該程序,按時間順序顯示以下消息框:
1[title: Initialized |text: 4231184]
2[title: mainwin |text: 2292968]
3[title: fail currentcheck |text: 4231184]
4[title: lobbywin |text: 4231188]
5[title: fail currentcheck |text: 4231184]
6[title: initialized |text: 4231188] (no more boxes until I click on host game)
7[title: value found: |text: 4231184]
8[title: lobbywin |text: 2292676]
9[title: fail currentcheck |text: 4231184]
10[title: lobbywin |text: 2292676]
11[title: fail currentcheck |text: 4231188] (no more boxes until I go back to the mainwindow and resize it slightly)
12[title: mainwin |text: 2291164]
13[title: fail currentcheck |text: 4231184]
14[title: mainwin |text: 2291164]
15[title: fail currentcheck |text: 4231188]
16[title: lobbywin |text: 4231188]
17[title: fail currentcheck |text: 4231184]
18[title: value found |text: 4231188]
我現在很困惑,希望閱讀此書的人可以向我解釋地址為何更改,在此先感謝您抽出寶貴時間閱讀我的問題。
更新:對於正在閱讀本文的任何人,除了whoz craigs回答,我還想補充一點,在c ++中,調用全局變量而不是局部變量的方法是在變量之前添加::。
在這兩個窗口過程中,您都將參數HWND發送到scalewindow。 不是全球性的。 因此,它們是不同的地址。 名稱解析使用“最近”變量,在兩種情況下,該變量都是HWND參數,而不是您要使用的HWND全局變量。
例:
LRESULT CALLBACK mainproc(HWND mainwin, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_SIZE:
{
scalewindowsize (mainwin, "mainwin"); // passes parameter mainwin by reference
scalewindowsize (lobbywin, "lobbywin"); // passes global lobbywin by reference
break;
}
因此,引用將具有不同的地址分辨率。 另一個例子:
LRESULT CALLBACK lobbyproc(HWND lobbywin, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_SIZE:
{
scalewindowsize (mainwin, "mainwin"); // passes global mainwin by reference
scalewindowsize (lobbywin, "lobbywin"); // passes parameter lobbywin by reference
break;
}
break;
在WhozCraig已經回答了您提出的問題之后,我將解釋如何獲得您真正想要的東西。 歸結為您決定存儲HWND
地址的決定是錯誤的決定。 只需存儲HWND
它已經達到指針大小,因此您不會浪費任何空間或執行昂貴的復制操作。
您的容器應為:
std::vector<HWND> sizevalues;
將您的createscalingwindow
函數更改為此(偽代碼):
void createscalingwindow( ... )
{
cswpara0 = CreateWindowEx( .... );
sizevalues.push_back(cswpara0);
...
}
而且您的scalewindowsize
函數應按以下方式修改(再次,偽代碼,僅包含需要更改的部分):
void scalewindowsize(HWND ownerwin, ...)
{
char buffer[100];
int checknumber = 0;
while (checknumber < sizevalues.size())
{
if (sizevalues[checknumber] == ownerwin)
{
...
}
else
{
...
}
}
}
這應該可以解決您的問題。
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