当我改变他的背景时，我失去了按钮的功能

问题描述：

当我改变背景时，我有一个方形的形状，不可能点击它。有人可以分享一个很好的教程或代码示例？

反正这是我的代码：

LRESULT CALLBACK DrawPushButton(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) 
{ 
HDC   hdcMem; 
HBITMAP  hbmMem; 
HANDLE  hnd; 
PAINTSTRUCT ps; 
HDC   hdc; 

int win_width=100; 
int win_height=50; 
    switch(uMsg) 
    { 
    case WM_PAINT: 
     hdc = BeginPaint(hwnd, &ps); 

     hdcMem = CreateCompatibleDC(hdc); 
     hbmMem = CreateCompatibleBitmap(hdc, win_width, win_height); 
     hnd = SelectObject(hdcMem, hbmMem); 
     BitBlt(hdc, 0, 0, win_width, win_height, hdcMem, 0, 0, SRCCOPY); 
     EndPaint(hwnd, &ps); 
     return 0; 
     break; 
    } 
    return CallWindowProc (OldWndProc, hwnd, uMsg, wParam, lParam); 
}

编辑：我加入了BS_OWNERDRAW windows风格的按钮：

HWND hWndButton=CreateWindowEx(NULL,L"BUTTON",L"OK",WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON|BS_OWNERDRAW,50,220,100,24,hWnd,(HMENU)IDC_MAIN_BUTTON,GetModuleHandle(NULL),NULL);

，我改变了回调，但WM_DRAWITEM没有电话：

LRESULT CALLBACK DrawPushButton(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) 
{ 
    switch(uMsg) 
    { 
    case WM_DRAWITEM: 
      HDC hdc = GetDC(hwnd); 
      TextOut(hdc,0,0,L"itay",4); 
     break; 
    } 
    return 0; 
}

要自定义绘制一个按钮，你需要给它的'BS_OWNERDRAW'窗口样式，然后处理'WM_DRAWITEM'消息。 –

你不认为你应该删除你正在创建的DC和位图*每次按钮绘制*时？ –

@RemyLebeau我添加了BS_OWNERDRAW，但是当我调试程序时，WM_DRAWITEM没有调用。看到我上面的评论。 –

答

这不是一个'好'的代码，虽然它是功能性的 - 您应该像上面提到的那样使用BS_OWNERDRAW样式，并在包含按钮的对话框/窗口的wndproc中处理图形。我已经选择粘贴一个我已经用过的方式来处理它的旧例子。你必须自己做全部。但是，您确实有机会对WM_TIMER消息做出响应，即获得按钮使其跳动或脉动。（不确定是否有机会这样做，如果你只是从对话框/窗口的WindowProc中进行绘图）

为了简单起见，我还选择使用被取代的子分类方法。由于公共控件版本6，您应该使用SetWindowSubclass（http://msdn.microsoft.com/en-us/library/windows/desktop/bb762102(v=vs.85).aspx）

的main.cpp

#include <windows.h> 
#include <commctrl.h> 
#include <stdio.h> 
#include "resource.h" 

HINSTANCE hInst; 

LRESULT CALLBACK btnProc(HWND btnWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) 
{ 
    long oldWndProc; 
    int i; 
    oldWndProc = GetWindowLong(btnWnd, GWL_USERDATA); 
    switch (uMsg) 
    { 
     case WM_PAINT: 
      { 
       HDC hdc; 
       PAINTSTRUCT ps; 
       RECT mRect; 
       HBRUSH mBrush; 

       hdc = BeginPaint(btnWnd, &ps); 
       mBrush = CreateSolidBrush(RGB(100, 147, 111)); 
       GetClientRect(btnWnd, &mRect); 
       FillRect(hdc, &mRect, mBrush); 
       DeleteObject(mBrush); 

       EndPaint(btnWnd, &ps); 
      } 
      return 0; 
    } 
    return CallWindowProc((WNDPROC)oldWndProc, btnWnd, uMsg, wParam, lParam); 
} 


void onCommand(HWND hwndDlg, WPARAM wParam, LPARAM lParam) 
{ 
    switch (LOWORD(wParam)) 
    { 
    case IDC_BUTTON1: 
     MessageBeep(MB_ICONEXCLAMATION); 
     break; 
    } 
} 

LRESULT CALLBACK DlgMain(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) 
{ 
    switch(uMsg) 
    { 
     case WM_INITDIALOG: 
     { 
      HWND btnWnd; 
      long oldBtnProc; 
      btnWnd = GetDlgItem(hwndDlg, IDC_BUTTON1); 
      oldBtnProc = GetWindowLong(btnWnd, GWL_WNDPROC); 
      SetWindowLong(btnWnd, GWL_USERDATA, oldBtnProc); 
      SetWindowLong(btnWnd, GWL_WNDPROC, (long)btnProc); 
     } 
     return TRUE; 

     case WM_CLOSE: 
     { 
      EndDialog(hwndDlg, 0); 
     } 
     return TRUE; 

     case WM_COMMAND: 
      onCommand(hwndDlg, wParam, lParam); 
      return TRUE; 
    } 
    return FALSE; 
} 


int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) 
{ 
    hInst=hInstance; 
    InitCommonControls(); 
    return DialogBox(hInst, MAKEINTRESOURCE(DLG_MAIN), NULL, (DLGPROC)DlgMain); 
}

RESOURCE.H

#ifndef IDC_STATIC 
#define IDC_STATIC (-1) 
#endif 

#define DLG_MAIN        100 
#define IDC_BUTTON1        1000

RESOURCE.RC

// Generated by ResEdit 1.5.11 
// Copyright (C) 2006-2012 
// http://www.resedit.net 

#include <windows.h> 
#include <commctrl.h> 
#include <richedit.h> 
#include "resource.h" 

// 
// Dialog resources 
// 
LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL 
DLG_MAIN DIALOG 0, 0, 186, 95 
STYLE DS_3DLOOK | DS_CENTER | DS_MODALFRAME | DS_SHELLFONT | WS_CAPTION | WS_VISIBLE | WS_POPUP | WS_SYSMENU 
CAPTION "Dialog" 
FONT 8, "Ms Shell Dlg" 
{ 
    PUSHBUTTON  "Button1", IDC_BUTTON1, 7, 7, 50, 14 
} 

// 
// Manifest resources 
// 
LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL 
1     RT_MANIFEST ".\\manifest.xml"

的manifest.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> 
    <dependency> 
    <dependentAssembly> 
     <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/> 
    </dependentAssembly> 
    </dependency> 
    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3"> 
    <security> 
     <requestedPrivileges> 
     <requestedExecutionLevel 
      level="asInvoker" 
      uiAccess="false"/> 
     </requestedPrivileges> 
    </security> 
    </trustInfo> 
</assembly>

当我改变他的背景时，我失去了按钮的功能

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