基本窗口创建
基本窗口创建
提问于 2018-06-13 01:48:52
我在处理Windows窗口时遇到了问题，尽管我以前这样做过一次，而且效果很好。在阅读了有关这个问题的最常见建议之后，它仍然存在。有人能告诉我为什么输入处理中断吗？
预期行为：
- 创建一个名为“FirstTry”的窗口
- 使其背景变黑，使用PatBlt
- 当第一次输入主循环时，在按‘w’之后显示消息框。
- 当按Alt+F4、Escape或Close按钮显示关闭消息时，请关闭窗口.
观察到的行为：
- 按原计划
- 按原计划
- MessageBox第一次出现，但不能用“w”重新触发
- 窗口不可关闭，除非使用TaskManager(一次显示“关闭应用程序”-MessageBox，但只显示一次)
- 窗口可拖动，直到第一个“进入循环”-MessageBox关闭，之后其固定
- 在第一个MessageBox之后，会显示Windows 10的蓝色“繁忙”小圆圈。
系统：
- Windows 10，版本1803(构建17134.81)，64位
来自VS 2017社区版的编译器：
- vcvarsall.bat AMD 64
- CL-MTD-NoLogo-FC-zi-W4-WX-wd 4100-wd 4312 FirstTry.cpp/link User32.lib Gdi32.lib
#include "windows.h"
static bool bAppIsRunning = false;
static bool bMessageAlreadyShown = false;
LRESULT CALLBACK win_MainWNDCallback(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam){
LRESULT result = 0;
switch(msg){
case WM_DESTROY:{
bAppIsRunning = false;
}break;
case WM_CLOSE:{
bAppIsRunning = false;
}break;
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_KEYDOWN:
case WM_KEYUP:{
WPARAM vKeyCode = wParam;
bool bWasDown = ((lParam & (1 << 30)) != 0);
bool bIsDown = ((lParam & (1 << 31)) == 0);
if (bWasDown != bIsDown)
{
switch (vKeyCode)
{
case VK_F4:{
if ((lParam & (1 << 29)) != 0)
{
bAppIsRunning = false;
}
}break;
case VK_ESCAPE:{
bAppIsRunning = false;
}break;
default:{
result = DefWindowProc(wnd,msg,wParam,lParam);
}break;
}
}
}break;
default:{
result = DefWindowProc(wnd,msg,wParam,lParam);
}break;
}
return result;
}
int CALLBACK WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance, LPSTR LpCmdLine, int NCmdShow){
WNDCLASSA wndCLass = {};
wndCLass.style = CS_HREDRAW | CS_VREDRAW;
wndCLass.lpfnWndProc = win_MainWNDCallback;
wndCLass.hInstance = HInstance;
wndCLass.lpszClassName = (LPCSTR)"WindowClass";
if(RegisterClassA(&wndCLass)){
HWND wnd = CreateWindowExA(
0, wndCLass.lpszClassName, (LPCSTR)"FirstTry",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT,
1240, 720,
0, 0, HInstance, 0);
if(wnd){
bAppIsRunning = true;
HDC DeviceContext = GetDC(wnd);
PatBlt(DeviceContext, 0, 0, 1240, 720, BLACKNESS);
ReleaseDC(wnd, DeviceContext);
while(bAppIsRunning){
if(!bMessageAlreadyShown){
MessageBoxA(NULL, (LPCSTR)"Successfully entered loop.", (LPCSTR)"Success!", MB_ICONINFORMATION | MB_OK);
bMessageAlreadyShown = true;
}
MSG msg;
while(PeekMessageA(&msg, 0, 0, 0, PM_REMOVE)){
switch(msg.message){
case WM_QUIT:{
bAppIsRunning = false;
}break;
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_KEYDOWN:
case WM_KEYUP:{
WPARAM vKeyCode = msg.wParam;
bool bWasDown = ((msg.lParam & (1<<30)) != 0);
bool bIsDown = ((msg.lParam & (1<<31)) != 0);
if(bIsDown != bWasDown){
switch(vKeyCode){
case 'W':{
bMessageAlreadyShown = false;
}break;
case VK_ESCAPE:{
bAppIsRunning = false;
}break;
default:{
TranslateMessage(&msg);
DispatchMessageA(&msg);
}break;
}
}
}
}
}
Sleep(250);
}
MessageBoxA(NULL, (LPCSTR)"Closing Application.", (LPCSTR)"Bye bye!", MB_ICONINFORMATION | MB_OK);
}
}
return ERROR_SUCCESS;
}回答 1
Stack Overflow用户
发布于 2018-06-13 11:25:06
试一试更像这样的东西：
#include <windows.h>
static bool bMessageAlreadyShown = false;
LRESULT CALLBACK win_MainWNDCallback(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam) {
switch (msg) {
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_KEYDOWN:
case WM_KEYUP: {
WPARAM vKeyCode = wParam;
bool bWasDown = ((lParam & (1 << 30)) != 0);
bool bIsDown = ((lParam & (1 << 31)) == 0);
if (bWasDown != bIsDown) {
switch (vKeyCode) {
case 'W':
case VK_ESCAPE:
DestroyWindow(wnd);
return 0;
}
}
break;
}
case WM_ERASEBKGND:
PatBlt((HDC)wParam, 0, 0, 1240, 720, BLACKNESS);
return 0;
}
return DefWindowProc(wnd, msg, wParam, lParam);;
}
int CALLBACK WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance, LPSTR LpCmdLine, int NCmdShow) {
WNDCLASSA wndCLass = {};
wndCLass.style = CS_HREDRAW | CS_VREDRAW;
wndCLass.lpfnWndProc = win_MainWNDCallback;
wndCLass.hInstance = HInstance;
wndCLass.lpszClassName = TEXT("WindowClass");
if (RegisterClassA(&wndCLass)) {
HWND wnd = CreateWindowExA( 0, wndCLass.lpszClassName, TEXT("FirstTry"), WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 1240, 720, 0, 0, HInstance, 0);
if (wnd) {
MSG msg;
while (GetMessage(&msg, 0, 0, 0)) {
if (!bMessageAlreadyShown) {
MessageBoxA(NULL, TEXT("Successfully entered loop."), TEXT("Success!"), MB_ICONINFORMATION | MB_OK);
bMessageAlreadyShown = true;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
MessageBoxA(NULL, TEXT("Closing Application."), TEXT("Bye bye!"), MB_ICONINFORMATION | MB_OK);
return ERROR_SUCCESS;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/-100004875
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