更改对话框 win32api 的背景颜色 [英] change the background color of a dialog box win32api
问题描述
我正在尝试更改对话框的背景颜色(win 7、vs2010、c++).
I'm trying to change the background color of a dialog box (win 7, vs2010,c++).
我试图捕捉WM_CTLCOLOR、WM_ERASEBKGND 并改变颜色.我设法只捕获了 WM_ERASEBKGND 消息，但通过这种方式，我在调试模式下管理以查看我更改了窗口的背景颜色，但是当对话框完成上传时，颜色溢出通过对话框的默认灰色.
I tried to catch WM_CTLCOLOR, WM_ERASEBKGND and change the color.
I managed to catch only the WM_ERASEBKGND message but in this way I manage in debug mode to see that I changed the background color of the window, but when the dialogBox is finish to upload itself, the color is overrun by the defualt grey color of the DialogBox.
我正在使用 CreateDialogParam 函数创建对话框.
I'm creating the DialogBox using the CreateDialogParam func.
case WM_ERASEBKGND:
{
HBRUSH brush;
RECT rect;
brush = CreateSolidBrush(RGB(255,0,0));
SelectObject((HDC)wParam,brush);
GetClientRect(m_hDlg,&rect)//m_hDlg is HWND type
Rectangle((HDC)wParam,rect.left,rect.top,rect.right,rect.bottom);
break;
}
我尝试使用该功能:
SetBkMode((HDC)wParam,TRANSPARENTE);
但它没有帮助.
我该怎么办?
推荐答案
当你响应 WM_ERASEBKGND 时，你必须return TRUE，否则你的默认对话框程序会设置颜色对话框的默认系统颜色.
When you respond to WM_ERASEBKGND you must return TRUE, otherwise your default dialog procedure will set the color of the dialog to the default system color.
此外，您在调用 SelectObject 时的第二个参数是错误的，它应该是 TRANSPARENT，而不是 TRANSPARENTE.
Also, your second parameter in your call to SelectObject is wrong, it should be TRANSPARENT, not TRANSPARENTE.
正如成员 arx 所说，你需要处理 WM_CTLCOLORDLG 消息来实现你想要的.
As member arx said, you need to handle WM_CTLCOLORDLG message to achieve what you want.
这是一个小型演示应用程序，您可以将其复制并粘贴到 Visual Studio 中:
Here is a small demo app that you can copy and paste into your Visual Studio:
在您的 resource.h 中粘贴:
//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ generated include file.
// Used by Dlg bkgnd.rc
//
#define IDD_DIALOG1 101
#define IDC_BUTTON1 1001
// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 102
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1002
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
不要忘记上面的空行！
在您的资源文件(.rc 扩展名)中粘贴:
In your resource file ( .rc extension ) paste this:
// Microsoft Visual C++ generated resource script.
//
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"
/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
// English (U.S.) resources
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#pragma code_page(1252)
#endif //_WIN32
#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//
1 TEXTINCLUDE
BEGIN
"resource.h\0"
END
2 TEXTINCLUDE
BEGIN
"#include ""afxres.h""\r\n"
"\0"
END
3 TEXTINCLUDE
BEGIN
"\r\n"
"\0"
END
#endif // APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//
IDD_DIALOG1 DIALOGEX 0, 0, 200, 124
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
DEFPUSHBUTTON "OK",IDOK,52,71,50,14
PUSHBUTTON "Cancel",IDCANCEL,111,71,50,14
PUSHBUTTON "",IDC_BUTTON1,47,23,73,16
END
/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//
#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO
BEGIN
IDD_DIALOG1, DIALOG
BEGIN
LEFTMARGIN, 7
RIGHTMARGIN, 189
TOPMARGIN, 7
BOTTOMMARGIN, 117
END
END
#endif // APSTUDIO_INVOKED
#endif // English (U.S.) resources
/////////////////////////////////////////////////////////////////////////////
#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//
/////////////////////////////////////////////////////////////////////////////
#endif // not APSTUDIO_INVOKED
最后，main.cpp:
#include "resource.h"
#include <windows.h>
// variable for storing the instance
static HINSTANCE hInst;
// handle for dialog box
static HWND Dlg;
// dialog procedure
INT_PTR CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
static HBRUSH testBrush;
switch(Message)
{
case WM_INITDIALOG:
//set text of our static control with the data sent to dialog
SetWindowText( GetDlgItem( hwnd, IDC_BUTTON1 ), (LPCWSTR)lParam );
//initialize the brush
testBrush = CreateSolidBrush( RGB( 255, 0, 0 ) );
return TRUE;
case WM_CTLCOLORDLG:
return (INT_PTR)( testBrush );
case WM_CLOSE:
// if we do not use stock brush we must destroy it
DeleteObject( testBrush );
DestroyWindow( hwnd );
Dlg = NULL;
return TRUE;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDOK:
case IDCANCEL:
// if we do not use stock brush we must destroy it
DeleteObject( testBrush );
DestroyWindow( hwnd );
Dlg = NULL;
break;
}
break;
default:
return FALSE;
}
return TRUE;
}
// WinMain's procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
Dlg = NULL;
// create button we can click on
HWND btn = CreateWindowEx( 0, L"Button", L"Click me!",
WS_VISIBLE | WS_CHILD | SS_NOTIFY,
65, 10, 70, 50, hwnd,
(HMENU)4000, hInst, 0);
}
return (LRESULT)0;
case WM_COMMAND:
switch( LOWORD(wParam) )
{
case 4000: // activate dialog box
{
// we will send anything as the parameter to the dialog
// this is just an example
Dlg = CreateDialogParam( hInst, MAKEINTRESOURCE(IDD_DIALOG1),
hwnd, DlgProc, (LPARAM)L"Test text" );
//show it
ShowWindow( Dlg, SW_SHOW );
}
break;
default: // pass it to the default window procedure
return DefWindowProc(hwnd, msg, wParam, lParam);
}
break;
case WM_PAINT:
{
// we do not paint anything
PAINTSTRUCT ps;
BeginPaint( hwnd, &ps);
EndPaint( hwnd, &ps);
}
return (LRESULT)0;
case WM_CLOSE:
DestroyWindow(hwnd);
return (LRESULT)0;
case WM_DESTROY:
PostQuitMessage(0);
return (LRESULT)0;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
// WinMain
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
int nCmdShow)
{
// store hInstance in global variable for later use
hInst = hInstance;
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
// register main window class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInst;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
wc.lpszMenuName = NULL;
wc.lpszClassName = L"Main_Window";
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, L"Window Registration Failed!", L"Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
// create main window
hwnd = CreateWindowEx( 0,
L"Main_Window",
L"test app",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
200, 100, NULL, NULL, hInstance, 0 );
if(hwnd == NULL)
{
MessageBox(NULL, L"Window creation failed!", L"Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
// check if message is for dialog or main window
if(!IsDialogMessage( Dlg, &Msg ) )
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
}
return Msg.wParam;
}
特别注意消息循环，以及我存储对话框的HWND的方式.
Especially pay attention to the message loop, and the way I have stored the HWND of the dialog.
另请注意，您创建的画笔是您不再需要时必须销毁的画笔(通常响应WM_CLOSE).
Also note that the brush you create is the brush you must destroy when you no longer need ( usually in response to WM_CLOSE ).
如果还有什么我可以帮忙的，尽管问我，我会尽力帮助你.
If there is anything else I can do to help, ask me and I will try to help you.
最好的问候.
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