关于WM_CHAR WM_KEYDOWN和WM_KEYUP的问题

Question

一个很简单的win32 sdk程序，发现一点小问题，好像响应了WM_KEYDOWN或WM_CHAR就不响应WM_KEYUP，请大家指教
#include <windows.h>
#include <stdio.h>LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);int WINAPI WinMain(
  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
)
{
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WinSunProc;
wndcls.lpszClassName="Weixin2003";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndcls); HWND hwnd;
hwnd=CreateWindow("Weixin2003","北京维新科学技术培训中心",WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,0,CW_USEDEFAULT,0,NULL,NULL,hInstance,NULL); ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd); MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
char szChar[20]; switch(uMsg)
{
case WM_CHAR:
sprintf(szChar,"char is %d",wParam);
MessageBox(hwnd,szChar,"weixin",0);
break;
   
    case WM_KEYDOWN:
    sprintf(szChar,"Key down");
MessageBox(hwnd,szChar,"weixin",0);    break; case WM_KEYUP:
sprintf(szChar,"Key up");
MessageBox(hwnd,szChar,"weixin",0);
break; case WM_LBUTTONDOWN:
MessageBox(hwnd,"mouse clicked","weixin",0);
HDC hdc;
hdc=GetDC(hwnd);
RECT rect;
GetClientRect(hwnd,&rect);
TextOut(hdc,0,50,"计算机编程语言培训",strlen("计算机编程语言培训"));

ReleaseDC(hwnd,hdc);
break;
case WM_PAINT:
HDC hDC;
PAINTSTRUCT ps;
hDC=BeginPaint(hwnd,&ps);
TextOut(hDC,0,0,"维新培训",strlen("维新培训"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,"是否真的结束？","weixin",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}

Answer 1

先收到WM_KEYDOWN 由TranslateMessage转为WM_CHAR 处理WM_CHAR 再处理KEYDOWN 之后不处理KEYUP

Answer 2

WM_KEYUP这个消息是要用户自己去处理!

Answer 3

把TranslateMessage(&msg); 注释掉后也是一样的，响应了WM_KEYDOWN就不响应WM_KEYUP，请问这是为什么？

Answer 4

你响应了WM_KEYDOWN或WM_CHAR,此时出现个消息框,按键已经UP了,窗口没有收到消息WM_KEYUP.
你把WM_KEYDOWN或WM_CHAR消息处理里,注释掉MessageBox()或换成别的,窗口就会收到消息WM_KEYUP.

Answer 5

MessageBox抢走了焦点，去掉即可。