/*--------------------------------------------------------
KEYVIEW1.C -- Displays Keyboard and Character Messages
(c) Charles Petzold, 1998
--------------------------------------------------------*/#include <windows.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("KeyView1") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Keyboard Message Viewer #1"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClientMax, cyClientMax, cxClient, cyClient, cxChar, cyChar ;
static int cLinesMax, cLines ;
static PMSG pmsg ;//MSG结构的阵列
static RECT rectScroll ;
static TCHAR szTop[] = TEXT ("Message Key Char ")
TEXT ("Repeat Scan Ext ALT Prev Tran") ;
static TCHAR szUnd[] = TEXT ("_______ ___ ____ ")
TEXT ("______ ____ ___ ___ ____ ____") ; static TCHAR * szFormat[2] = {
TEXT ("%-13s %3d %-15s%c%6u %4d %3s %3s %4s %4s"),
TEXT ("%-13s 0x%04X%1s%c %6u %4d %3s %3s %4s %4s")} ; static TCHAR * szYes = TEXT ("Yes") ;
static TCHAR * szNo = TEXT ("No") ;
static TCHAR * szDown = TEXT ("Down") ;
static TCHAR * szUp = TEXT ("Up") ; static TCHAR * szMessage [] = {
TEXT ("WM_KEYDOWN"), TEXT ("WM_KEYUP"),
TEXT ("WM_CHAR"), TEXT ("WM_DEADCHAR"),
TEXT ("WM_SYSKEYDOWN"), TEXT ("WM_SYSKEYUP"),
TEXT ("WM_SYSCHAR"), TEXT ("WM_SYSDEADCHAR") } ;
HDC hdc ;
int i, iType ;
PAINTSTRUCT ps ;
TCHAR szBuffer[128], szKeyName [32] ;
TEXTMETRIC tm ;
switch (message)
{
case WM_CREATE:
case WM_DISPLAYCHANGE:
//如果使用者在程式执行时调整了视讯显示的大小
//在这种情况下KEYVIEW1接收WM_DISPLAYCHANGE讯息,将重新分配此阵列。
// Get maximum size of client area cxClientMax = GetSystemMetrics (SM_CXMAXIMIZED) ;//得到窗口客户区最大的宽度,即最大化后客户区的宽度
cyClientMax = GetSystemMetrics (SM_CYMAXIMIZED) ;//得到窗口客户区最大的高度,即最大化后客户区的高度 // Get character size for fixed-pitch font hdc = GetDC (hwnd) ; SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;//便於以分行的方式显示此资讯,使用了等宽字体
GetTextMetrics (hdc, &tm) ;
cxChar = tm.tmAveCharWidth ;
cyChar = tm.tmHeight ; ReleaseDC (hwnd, hdc) ; // Allocate memory for display lines if (pmsg)
free (pmsg) ; cLinesMax = cyClientMax / cyChar ;
pmsg = (PMSG)malloc (cLinesMax * sizeof (MSG)) ;//使用标准C的malloc函式为阵列按字节配置记忆体。
//分配最大的可能需要的内存块,该阵列的大小依据最大化视窗的大小和等宽的系统字体。
cLines = 0 ;
// fall through
case WM_SIZE:
if (message == WM_SIZE)
{
cxClient = LOWORD (lParam) ;//窗口尺寸变化后得到客户区的尺寸
cyClient = HIWORD (lParam) ;
}
// Calculate scrolling rectangle
//计算滚动矩形框范围,此范围比客户区要小一行.
rectScroll.left = 0 ;
rectScroll.right = cxClient ;
rectScroll.top = cyChar ;
rectScroll.bottom = cyChar * (cyClient / cyChar) ; InvalidateRect (hwnd, NULL, TRUE) ;//使重画
return 0 ; //8种不同键盘讯息的全部资讯
case WM_KEYDOWN:
case WM_KEYUP:
case WM_CHAR:
case WM_DEADCHAR:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_SYSCHAR:
case WM_SYSDEADCHAR: // Rearrange storage array for (i = cLinesMax - 1 ; i > 0 ; i--)
{
pmsg[i] = pmsg[i - 1] ;
}
// Store new message pmsg[0].hwnd = hwnd ;
pmsg[0].message = message ;
pmsg[0].wParam = wParam ;
pmsg[0].lParam = lParam ; cLines = min (cLines + 1, cLinesMax) ; // Scroll up the display ScrollWindow (hwnd, 0, -cyChar, &rectScroll, &rectScroll) ; break ; // ie, call DefWindowProc so Sys messages work
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ; SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;
SetBkMode (hdc, TRANSPARENT) ;
//通常,Windows以一种「不透明」的方式显示文字,也就是说显示字元时Windows将擦除字元背景区。
//这将导致第二个字串(szUnd)擦除掉前一个(szTop)。
TextOut (hdc, 0, 0, szTop, lstrlen (szTop)) ;
TextOut (hdc, 0, 0, szUnd, lstrlen (szUnd)) ; for (i = 0 ; i < min (cLines, cyClient / cyChar - 1) ; i++)
{
//四类字元讯息
iType = pmsg[i].message == WM_CHAR ||
pmsg[i].message == WM_SYSCHAR ||
pmsg[i].message == WM_DEADCHAR ||
pmsg[i].message == WM_SYSDEADCHAR ; GetKeyNameText (pmsg[i].lParam, szKeyName,
sizeof (szKeyName) / sizeof (TCHAR)) ; /*
szFormat的定义如下:
static TCHAR * szFormat[2] = { TEXT ("%-13s %3d %-15s%c%6u %4d %3s %3s %4s %4s"),
TEXT ("%-13s 0x%04X%1s%c %6u %4d %3s %3s %4s %4s") } ; szMessage的定义如下:
static TCHAR * szMessage [] = {
TEXT ("WM_KEYDOWN"), TEXT ("WM_KEYUP"),
TEXT ("WM_CHAR"), TEXT ("WM_DEADCHAR"),
TEXT ("WM_SYSKEYDOWN"), TEXT ("WM_SYSKEYUP"),
TEXT ("WM_SYSCHAR"), TEXT ("WM_SYSDEADCHAR") } ;
*/
TextOut (hdc, 0, (cyClient / cyChar - 1 - i) * cyChar, szBuffer,
wsprintf (szBuffer, szFormat [iType],//是否为字元讯息
szMessage [pmsg[i].message - WM_KEYFIRST],
pmsg[i].wParam,
(PTSTR) (iType ? TEXT (" ") : szKeyName),//按键讯息的虚拟键代码,此代码是经由GetKeyNameText函式取得的
(TCHAR) (iType ? pmsg[i].wParam : ' '),//如果是字元信息,则打出pmsg[i].wParam LOWORD (pmsg[i].lParam),//以下是lParam变数的6个按键讯息栏位
HIWORD (pmsg[i].lParam) & 0xFF,
0x01000000 & pmsg[i].lParam ? szYes : szNo,
0x20000000 & pmsg[i].lParam ? szYes : szNo,
0x40000000 & pmsg[i].lParam ? szDown : szUp,
0x80000000 & pmsg[i].lParam ? szUp : szDown)) ;
}
EndPaint (hwnd, &ps) ;
return 0 ; case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
红色部分为什么是cyClient / cyChar - 1 - i呀,具体怎么实现滚动的?
KEYVIEW1.C -- Displays Keyboard and Character Messages
(c) Charles Petzold, 1998
--------------------------------------------------------*/#include <windows.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("KeyView1") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Keyboard Message Viewer #1"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClientMax, cyClientMax, cxClient, cyClient, cxChar, cyChar ;
static int cLinesMax, cLines ;
static PMSG pmsg ;//MSG结构的阵列
static RECT rectScroll ;
static TCHAR szTop[] = TEXT ("Message Key Char ")
TEXT ("Repeat Scan Ext ALT Prev Tran") ;
static TCHAR szUnd[] = TEXT ("_______ ___ ____ ")
TEXT ("______ ____ ___ ___ ____ ____") ; static TCHAR * szFormat[2] = {
TEXT ("%-13s %3d %-15s%c%6u %4d %3s %3s %4s %4s"),
TEXT ("%-13s 0x%04X%1s%c %6u %4d %3s %3s %4s %4s")} ; static TCHAR * szYes = TEXT ("Yes") ;
static TCHAR * szNo = TEXT ("No") ;
static TCHAR * szDown = TEXT ("Down") ;
static TCHAR * szUp = TEXT ("Up") ; static TCHAR * szMessage [] = {
TEXT ("WM_KEYDOWN"), TEXT ("WM_KEYUP"),
TEXT ("WM_CHAR"), TEXT ("WM_DEADCHAR"),
TEXT ("WM_SYSKEYDOWN"), TEXT ("WM_SYSKEYUP"),
TEXT ("WM_SYSCHAR"), TEXT ("WM_SYSDEADCHAR") } ;
HDC hdc ;
int i, iType ;
PAINTSTRUCT ps ;
TCHAR szBuffer[128], szKeyName [32] ;
TEXTMETRIC tm ;
switch (message)
{
case WM_CREATE:
case WM_DISPLAYCHANGE:
//如果使用者在程式执行时调整了视讯显示的大小
//在这种情况下KEYVIEW1接收WM_DISPLAYCHANGE讯息,将重新分配此阵列。
// Get maximum size of client area cxClientMax = GetSystemMetrics (SM_CXMAXIMIZED) ;//得到窗口客户区最大的宽度,即最大化后客户区的宽度
cyClientMax = GetSystemMetrics (SM_CYMAXIMIZED) ;//得到窗口客户区最大的高度,即最大化后客户区的高度 // Get character size for fixed-pitch font hdc = GetDC (hwnd) ; SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;//便於以分行的方式显示此资讯,使用了等宽字体
GetTextMetrics (hdc, &tm) ;
cxChar = tm.tmAveCharWidth ;
cyChar = tm.tmHeight ; ReleaseDC (hwnd, hdc) ; // Allocate memory for display lines if (pmsg)
free (pmsg) ; cLinesMax = cyClientMax / cyChar ;
pmsg = (PMSG)malloc (cLinesMax * sizeof (MSG)) ;//使用标准C的malloc函式为阵列按字节配置记忆体。
//分配最大的可能需要的内存块,该阵列的大小依据最大化视窗的大小和等宽的系统字体。
cLines = 0 ;
// fall through
case WM_SIZE:
if (message == WM_SIZE)
{
cxClient = LOWORD (lParam) ;//窗口尺寸变化后得到客户区的尺寸
cyClient = HIWORD (lParam) ;
}
// Calculate scrolling rectangle
//计算滚动矩形框范围,此范围比客户区要小一行.
rectScroll.left = 0 ;
rectScroll.right = cxClient ;
rectScroll.top = cyChar ;
rectScroll.bottom = cyChar * (cyClient / cyChar) ; InvalidateRect (hwnd, NULL, TRUE) ;//使重画
return 0 ; //8种不同键盘讯息的全部资讯
case WM_KEYDOWN:
case WM_KEYUP:
case WM_CHAR:
case WM_DEADCHAR:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_SYSCHAR:
case WM_SYSDEADCHAR: // Rearrange storage array for (i = cLinesMax - 1 ; i > 0 ; i--)
{
pmsg[i] = pmsg[i - 1] ;
}
// Store new message pmsg[0].hwnd = hwnd ;
pmsg[0].message = message ;
pmsg[0].wParam = wParam ;
pmsg[0].lParam = lParam ; cLines = min (cLines + 1, cLinesMax) ; // Scroll up the display ScrollWindow (hwnd, 0, -cyChar, &rectScroll, &rectScroll) ; break ; // ie, call DefWindowProc so Sys messages work
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ; SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;
SetBkMode (hdc, TRANSPARENT) ;
//通常,Windows以一种「不透明」的方式显示文字,也就是说显示字元时Windows将擦除字元背景区。
//这将导致第二个字串(szUnd)擦除掉前一个(szTop)。
TextOut (hdc, 0, 0, szTop, lstrlen (szTop)) ;
TextOut (hdc, 0, 0, szUnd, lstrlen (szUnd)) ; for (i = 0 ; i < min (cLines, cyClient / cyChar - 1) ; i++)
{
//四类字元讯息
iType = pmsg[i].message == WM_CHAR ||
pmsg[i].message == WM_SYSCHAR ||
pmsg[i].message == WM_DEADCHAR ||
pmsg[i].message == WM_SYSDEADCHAR ; GetKeyNameText (pmsg[i].lParam, szKeyName,
sizeof (szKeyName) / sizeof (TCHAR)) ; /*
szFormat的定义如下:
static TCHAR * szFormat[2] = { TEXT ("%-13s %3d %-15s%c%6u %4d %3s %3s %4s %4s"),
TEXT ("%-13s 0x%04X%1s%c %6u %4d %3s %3s %4s %4s") } ; szMessage的定义如下:
static TCHAR * szMessage [] = {
TEXT ("WM_KEYDOWN"), TEXT ("WM_KEYUP"),
TEXT ("WM_CHAR"), TEXT ("WM_DEADCHAR"),
TEXT ("WM_SYSKEYDOWN"), TEXT ("WM_SYSKEYUP"),
TEXT ("WM_SYSCHAR"), TEXT ("WM_SYSDEADCHAR") } ;
*/
TextOut (hdc, 0, (cyClient / cyChar - 1 - i) * cyChar, szBuffer,
wsprintf (szBuffer, szFormat [iType],//是否为字元讯息
szMessage [pmsg[i].message - WM_KEYFIRST],
pmsg[i].wParam,
(PTSTR) (iType ? TEXT (" ") : szKeyName),//按键讯息的虚拟键代码,此代码是经由GetKeyNameText函式取得的
(TCHAR) (iType ? pmsg[i].wParam : ' '),//如果是字元信息,则打出pmsg[i].wParam LOWORD (pmsg[i].lParam),//以下是lParam变数的6个按键讯息栏位
HIWORD (pmsg[i].lParam) & 0xFF,
0x01000000 & pmsg[i].lParam ? szYes : szNo,
0x20000000 & pmsg[i].lParam ? szYes : szNo,
0x40000000 & pmsg[i].lParam ? szDown : szUp,
0x80000000 & pmsg[i].lParam ? szUp : szDown)) ;
}
EndPaint (hwnd, &ps) ;
return 0 ; case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
红色部分为什么是cyClient / cyChar - 1 - i呀,具体怎么实现滚动的?
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你都看到这了,应该看过前面滚动条的例子了cyChar 是字的高度,cyClient / cyChar就是计算客户端能够容纳多少行字
cyClient / cyChar - 1 - i无疑就是一个写的字从第几行开始
ScrollWindow (hwnd, 0, -cyChar, &rectScroll, &rectScroll)
不就把前面的内容整体上移吗,只是最下面的一行移没了,需要重新重绘吗
--------------------------------
TextOut的第二个参数是纵坐标
i=0时,msg[0]不是第一条消息吗,不是应该显示在上面吗,按照cyClient / cyChar - 1 - i,不是显示在最下面一行吗?