Different window, using the same window procedure-CodePudding

Different window, using the same window procedure, which should be at runtime is a number of different thread!!!! ?
I am a little confusion,
This from the Angle of the code should be the same! ? Just because a function pointer pointing to the cause, but in different threads are formed when the runtime, different window should not interfere with each other chaos,

I understand to this?

CodePudding user response:

Different window, the use of the same window process "
"Different window", that is, different m_hWnd!

CodePudding user response:

reference 1st floor schlafenhamster response:

different window, the use of the same window process "
"Different window", that is, different m_hWnd!

Has this problem, because I really can't solve the problem of no response of the edit control, want to do an edit control, but because use it there will be a lot of places in the program, so worried that there is a custom edit controls window procedure chaos disturbance,

CodePudding user response:

Example:

 
Similar window.//CPP: Defines the entry point for the console application. 
//
#include  
//hide the console window 
# pragma comment (would, "/subsystem: \ Windows \ mainCRTStartup"/entry: \ "" ") 

# define WM_SETIMAGE WM_APP + 1 

HINSTANCE HINSTANCE, 
HWND hwndT0=0, hwndT1=0, hwndT2=0, hwndT3=0; 
HBITMAP hbmpT0=0, hbmpT1=0, hbmpT2=0, hbmpT3=0; 
Int g_WinNum=0; 
//
LRESULT a CALLBACK WindowProc (HWND HWND, UINT uMsg, WPARAM WPARAM, LPARAM LPARAM) 
{
HDC hmemDC; 
HBITMAP hbmpOld; 
HDC HDC. 
The RECT rc; 
HBITMAP hbmpTmp; 
Int nWindth; 
Int nHeight; 
POINT pt; 
Char * fileName. 
Char TXT [10]. 

PAINTSTRUCT ps; 
The switch (uMsg) 
{
In case the WM_PAINT: 
HDC=BeginPaint (HWND, & amp; Ps); 
//
GetClientRect (HWND, & amp; Rc); 
NWindth=rc. Right - rc. Left; 
NHeight=rc. Bottom - rc. Top; 
HmemDC=CreateCompatibleDC (HDC); 
//
SetBkMode (HDC, TRANSPARENT); 
If (HWND==hwndT0) 
{
If (hbmpT0) 
{
HbmpOld=(HBITMAP) SelectObject (hmemDC hbmpT0); 
Strcpy (TXT, "Test0"); 
} 
} 
Else if (HWND==hwndT1) 
{
If (hbmpT1) 
{
HbmpOld=(HBITMAP) SelectObject (hmemDC hbmpT1); 
Strcpy (TXT, "Test1"); 
} 
} 
Else if (HWND==hwndT2) 
{
If (hbmpT2) 
{
HbmpOld=(HBITMAP) SelectObject (hmemDC hbmpT2); 
Strcpy (TXT, "Test2"); 
} 
} 
Else if (HWND==hwndT3) 
{
If (hbmpT3) 
{
HbmpOld=(HBITMAP) SelectObject (hmemDC hbmpT3); 
Strcpy (TXT, "Test3"); 
} 
} 
//the draw 
SetStretchBltMode (HDC, HALFTONE); 
StretchBlt (HDC, 0, 0, nWindth, nHeight, hmemDC, 0,0,200,200, SRCCOPY); 
//text 
TextOut (HDC, 0, 0, TXT, strlen ()); 
//free 
SelectObject (hmemDC hbmpOld); 
EndPaint (HWND, & amp; Ps); 
return 0; 
Case WM_SETIMAGE: 
FileName=lParam (char *); 
HbmpTmp=(HBITMAP) : : LoadImage (NULL, fileName, IMAGE_BITMAP, 0, 0, 
LR_LOADFROMFILE | LR_CREATEDIBSECTION); 
If (HWND==hwndT0) 
{
HbmpT0=hbmpTmp; 
} 
Else if (HWND==hwndT1) 
{
HbmpT1=hbmpTmp; 
} 
Else if (HWND==hwndT2) 
{
HbmpT2=hbmpTmp; 
} 
Else if (HWND==hwndT3) 
{
HbmpT3=hbmpTmp; 
} 
return 0; 
Case WM_SETCURSOR: 
GetClientRect (HWND, & amp; Rc); 
The GetCursorPos (& amp; Pt); 
ScreenToClient (HWND, & amp; Pt); 
If (PtInRect (& amp; Rc, pt)) 
{
LParam=HTCLIENT;//arrow 
} 
break; 
Case WM_DESTROY: 
G_WinNum -; 
If (g_WinNum==0) PostQuitMessage (0); 
return 0; 
} 
Return DefWindowProc (HWND, uMsg wParam, lParam); 
} 
//
Void initRegister () 
{
HInstance=GetModuleHandle (NULL); 
WNDCLASS WNDC; 
WNDC. CbClsExtra=0; 
WNDC. CbWndExtra=0; 
WNDC. HCursor=LoadCursor (hInstance, IDC_ARROW); 
WNDC. HIcon=LoadIcon (hInstance, IDI_APPLICATION); 
WNDC. LpszMenuName=NULL; 
WNDC. Style=CS_HREDRAW | CS_VREDRAW; 
WNDC. HbrBackground=(COLOR_WINDOW HBRUSH); 
WNDC. LpfnWndProc=WindowProc; 
WNDC. LpszClassName="classname"; 
WNDC. HInstance=hInstance; 
//
RegisterClass (& amp; WNDC); 
} 
//
The HWND aptly named createWidget (char * name, int x, int y, int width, int height) 
{
HWND HWND=0; 
HWnd=CreateWindow (" classname ", the name, 
WS_OVERLAPPEDWINDOW | WS_VISIBLE, 
X, y, width, height, 
NULL, 
NULL,//(HMENU) (int) (ID_FIRSTCHILD + I),=100... 
HInstance, 
NULL); 
//
G_WinNum + +; 
//
Return the hWnd; 
} 
//
Void SetWndImage (HWND HWND, char * fileName)//this is only notification display picture 
{
SendMessage (hWnd, WM_SETIMAGE, 0, (LPARAM) fileName); 
} 
//
# define ScreenX 240 
# define ScreenY 100 
Void main () 
{//
InitRegister (); 
HwndT0=aptly named createWidget (" test0, "ScreenX ScreenY, 300300); 
SetWndImage (hwndT0, a. "mp"); 
HwndT1=aptly named createWidget (" test1 ", ScreenX + 300, ScreenY, 300300); 
B.b mp SetWndImage (hwndT1, ""); 
//row 2 
HwndT2=aptly named createWidget (" test2 ", ScreenX ScreenY + 300300300); 
SetWndImage (hwndT2, "mount mp"); 
HwndT3=aptly named createWidget (" test3 ", ScreenX + 300, ScreenY + 300300300); 
SetWndImage (hwndT3, "db mp"); 
//
MSG MSG. 
While (GetMessage (& amp; MSG, NULL, 0, 0)) 
{
TranslateMessage (& amp; MSG); 
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