我是WINAPI编程的新手。我想在Windows窗体上制作一个简单的井字游戏，但是当我想要更改按钮文本时我遇到了问题。我的代码编译，但SendMessage函数不起作用。我的代码：
#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
#include <tchar.h>
#include <iostream>
#define __T(x) L ## x
#define BUTTON_1x1 1
#define BUTTON_1x2 2
#define BUTTON_1x3 3
#define BUTTON_2x1 4
#define BUTTON_2x2 5
#define BUTTON_2x3 6
#define BUTTON_3x1 7
#define BUTTON_3x2 8
#define BUTTON_3x3 9
HWND hWnd;
HWND _3x3;
HWND _3x2;
HWND _3x1;
HWND _2x3;
HWND _2x2;
HWND _2x1;
HWND _1x3;
HWND _1x2;
HWND _1x1;
LRESULT CALLBACK WindowProc(HWND hWnd,
UINT message,
WPARAM wParam,
LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HWND hWnd;
WNDCLASSEX wc;
ZeroMemory(&wc, sizeof(WNDCLASSEX));
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
wc.lpszClassName = "WindowClass1";
RegisterClassEx(&wc);
hWnd = CreateWindowExW(NULL,
L"WindowClass1", // name of the window class
L"Desas", // title of the window
WS_OVERLAPPEDWINDOW, // window style
300, // x-position of the window
300, // y-position of the window
380, // width of the window
480, // height of the window
NULL, // we have no parent window, NULL
NULL, // we aren't using menus, NULL
hInstance, // application handle
NULL); // used with multiple windows, NULL
ShowWindow(hWnd, nCmdShow);
MSG msg;
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_CREATE:
{
HWND _1x1 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"21",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
30, 100, 100, 100,
hWnd,
(HMENU) BUTTON_1x1,
NULL,
NULL);
HWND _1x2 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"32",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
130, 100, 100, 100,
hWnd,
(HMENU) BUTTON_1x2,
NULL,
NULL);
HWND _1x3 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"12",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
230, 100, 100, 100,
hWnd,
(HMENU) BUTTON_1x3,
NULL,
NULL);
HWND _2x1 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"32",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
30, 200, 100, 100,
hWnd,
(HMENU) BUTTON_2x1,
NULL,
NULL);
HWND _2x2 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"12",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
130, 200, 100, 100,
hWnd,
(HMENU) BUTTON_2x2,
NULL,
NULL);
HWND _2x3 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"23",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
230, 200, 100, 100,
hWnd,
(HMENU) BUTTON_2x3,
NULL,
NULL);
HWND _3x1 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"12",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
30, 300, 100, 100,
hWnd,
(HMENU) BUTTON_3x1,
NULL,
NULL);
HWND _3x2 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"33",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
130, 300, 100, 100,
hWnd,
(HMENU) BUTTON_3x2,
NULL,
NULL);
HWND _3x3 = CreateWindowEx(WS_EX_CLIENTEDGE,
"BUTTON",
"12",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON | BS_TEXT,
230, 300, 100, 100,
hWnd,
(HMENU) BUTTON_3x3,
NULL,
NULL);
HWND _PLAYER_TXT = CreateWindowEx(NULL,
"STATIC",
"PLAYER :",
WS_VISIBLE | WS_CHILD | SS_LEFT,
230, 50, 100, 30,
hWnd,
(HMENU) 999,
NULL,
NULL);
} break;
case WM_COMMAND:
{
if (LOWORD(wParam) == BUTTON_3x3)
{
std::cout << "!!!!!" << std::endl; //test(if buttonclick message is recived)
SendMessage(_3x3, WM_SETTEXT, 0, (LPARAM) _T("NewText")); //not working
}
} break;
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
} break;
}
return DefWindowProc (hWnd, message, wParam, lParam);
}
抱歉这一堆代码。如果我知道哪个部分很重要，我会缩短它。对不起，我的英语不好。谢谢。
答案 0 :(得分：7)
你的行
HWND _3x3 = CreateWindowEx...
影响全球。如果您调试了该程序，那么当您尝试发送该消息时，您会注意到_3x3为NULL。
答案 1 :(得分：1)
尝试一下：
case WM_COMMAND:
{
if(LOWORD(wParam) == BUTTON_3x3)
{
_3x3 = NULL;
_3x3 = CreateWindowEx(0,
WC_BUTTON,
"Text",230, 300, 100, 100,
hwnd,
(HMENU)BUTTON_3x3,
NULL, NULL);
}
}
break;
答案 2 :(得分：0)
我的窗口是 ANSI ，但您将项目编译为 UNICODE 。 （使用TCHAR.h）
答案 3 :(得分：0)
您必须调用DefWindowProc来处理任何其他消息，例如WM_SETTEXT和其他消息。您可以简单地将它放在WindowProc中已有的交换机的默认情况下。