【发布时间】：2016-10-05 01:14:15
【问题描述】：
在设置窗口类的背景时，我遇到了一个奇怪的故障。我是这样设置的：
wcWndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
但是，当我测试我的游戏时，我看到的是：
背景故障图像
这是 Windows API 或我的代码的故障吗？感谢您的帮助。
编辑：我发现背景只绘制到标题。所以如果我向上或向下移动文本控件，背景也会向上或向下移动。
// Game
// Destroyable!
#include "Game.h"
HRESULT Game::Initialize(INT nCmdShow) {
WNDCLASSEX wcWndClass;
RECT rcSettingsClientRect;
wcWndClass.style = CS_HREDRAW | CS_VREDRAW;
wcWndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
wcWndClass.cbSize = sizeof(WNDCLASSEX);
wcWndClass.cbWndExtra = sizeof(LONG_PTR);
wcWndClass.cbClsExtra = 0;
wcWndClass.lpszClassName = L"wcWndClass";
wcWndClass.lpszMenuName = NULL;
wcWndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wcWndClass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
wcWndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
wcWndClass.hInstance = GetModuleHandle(NULL);
wcWndClass.lpfnWndProc = Game::WindowProcedure;
HRESULT hResult = RegisterClassEx(&wcWndClass) ? S_OK : E_UNEXPECTED;
if (SUCCEEDED(hResult)) {
RECT rcSettingsWndRect = {0, 0, 300, 300};
AdjustWindowRectEx(&rcSettingsWndRect, WS_OVERLAPPEDWINDOW, FALSE, WS_EX_WINDOWEDGE);
m_hSettingsWnd = CreateWindowEx(WS_EX_WINDOWEDGE, L"wcWndClass", L"Game Settings", WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, CW_USEDEFAULT, CW_USEDEFAULT, rcSettingsWndRect.right - rcSettingsWndRect.left, rcSettingsWndRect.bottom - rcSettingsWndRect.top, NULL, NULL, GetModuleHandle(NULL), this);
hResult = m_hSettingsWnd ? S_OK : E_UNEXPECTED;
}
if (SUCCEEDED(hResult)) {
RECT rcGameWndRect = {0, 0, 300, 300};
AdjustWindowRectEx(&rcGameWndRect, WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, FALSE, WS_EX_WINDOWEDGE);
m_hGameWnd = CreateWindowEx(WS_EX_WINDOWEDGE, L"wcWndClass", L"Gee Yoo Aye", WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, CW_USEDEFAULT, CW_USEDEFAULT, rcGameWndRect.right - rcGameWndRect.left, rcGameWndRect.bottom - rcGameWndRect.top, NULL, NULL, GetModuleHandle(NULL), this);
hResult = m_hGameWnd ? S_OK : E_UNEXPECTED;
}
if (SUCCEEDED(hResult)) {
GetClientRect(m_hSettingsWnd, &rcSettingsClientRect);
InitCommonControls();
m_hTitleWnd = CreateWindowEx(NULL, L"Static", L"Gee Yoo Aye", WS_VISIBLE | WS_CHILD | SS_CENTER, 0, rcSettingsClientRect.bottom / 7, rcSettingsClientRect.right, rcSettingsClientRect.bottom, m_hSettingsWnd, (HMENU) TITLE, GetModuleHandle(NULL), NULL);
hResult = m_hTitleWnd ? S_OK : E_UNEXPECTED;
}
if (SUCCEEDED(hResult)) {
SendMessage(m_hTitleWnd, WM_SETFONT, (WPARAM) CreateFont(36, 0, 0, 0, FW_BOLD, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, NULL), TRUE);
m_hSizeSliderWnd = CreateWindowEx(NULL, TRACKBAR_CLASS, L"Board Size", WS_VISIBLE | WS_CHILD | TBS_AUTOTICKS, rcSettingsClientRect.right / 6, rcSettingsClientRect.bottom / 2, rcSettingsClientRect.right * 2 / 3, 25, m_hSettingsWnd, (HMENU) SIZE_SLIDER, GetModuleHandle(NULL), NULL);
hResult = m_hSizeSliderWnd ? S_OK : E_UNEXPECTED;
}
if (SUCCEEDED(hResult)) {
ShowWindow(m_hSettingsWnd, nCmdShow);
UpdateWindow(m_hSettingsWnd);
}
return hResult;
}
WPARAM Game::RunMessageLoop() {
MSG mMsg;
while (GetMessage(&mMsg, NULL, 0, 0)) {
TranslateMessage(&mMsg);
DispatchMessage(&mMsg);
}
return mMsg.wParam;
}
LRESULT CALLBACK Game::WindowProcedure(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
LRESULT lResult;
if (uMsg == WM_CREATE) {
LPCREATESTRUCT lpCreateStruct = (LPCREATESTRUCT) lParam;
Game* pGame = (Game*) lpCreateStruct -> lpCreateParams;
::SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(pGame));
lResult = 1;
} else {
Game* pGame = reinterpret_cast<Game*>(static_cast<LONG_PTR>(::GetWindowLongPtr(hWnd, GWLP_USERDATA)));
BOOL bHandled = FALSE;
if (pGame) {
switch (uMsg) {
case WM_DESTROY:
{
PostQuitMessage(0);
bHandled = TRUE;
lResult = 1;
break;
}
}
}
if (!bHandled) {
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
}
return lResult;
}
Struct = (LPCREATESTRUCT) lParam;
Game* pGame = (Game*) lpCreateStruct -> lpCreateParams;
::SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(pGame));
lResult = 1;
} else {
Game* pGame = reinterpret_cast<Game*>(static_cast<LONG_PTR>(::GetWindowLongPtr(hWnd, GWLP_USERDATA)));
BOOL bHandled = FALSE;
if (pGame) {
switch (uMsg) {
case WM_DESTROY:
{
PostQuitMessage(0);
bHandled = TRUE;
lResult = 1;
break;
}
}
}
if (!bHandled) {
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
}
return lResult;
}
【问题讨论】：
-
因为你没有展示你的代码，所以不可能知道。但是 Windows API 已经存在很长时间了，您的代码相当少。
-
寻求调试帮助的问题（“为什么这段代码不起作用？”）必须包括所需的行为、特定问题或错误以及重现它所需的最短代码在问题本身。没有明确的问题陈述的问题对其他读者没有用处。请参阅：How to create a Minimal, Complete, and Verifiable example。
-
代码太长，无法提出一个问题，我看不出有任何问题。只是我创建了两个控件，仅此而已。但无论如何都在这里：shorttext.com/7a1a71c1
-
@OlegAprelikov 看来你已经错过了“最小”和“问题本身”。
-
我不知道故障在哪里，也不知道如何重现。我不能把我的整个游戏都放在一个问题上，因为 StackOverflow 不允许这样做。
标签： c++ winapi background