引用万一老师的窗体生成代码 program Project1;uses
Windows, Messages;{等待调用的过程, 用于在窗体上绘制文本}
Procedure OnPaint(h: HDC);
const
s = 'CodeGear Delphi 2007';
begin
TextOut(h, 10, 10, PChar(s), Length(s));
end;{窗口回调过程}
function WndProc(wnd: HWND; msg: UINT; wParam: Integer; lParam: Integer): Integer; stdcall;
var
Handle: HDC;
ps: PAINTSTRUCT;
begin
case msg of
WM_PAINT: begin
Handle := BeginPaint(wnd, ps);
OnPaint(Handle);
EndPaint(wnd, ps);
result := 0;
end;
WM_DESTROY: begin
PostQuitMessage(0);
result := 0;
end;
else
Result := DefWindowProc(wnd, msg, wParam, lParam);
end;
end;{主程序}
var
hWnd : THandle;
Msg : TMsg;
MyWndClass : TWndClass;
begin
MyWndClass.style := CS_HREDRAW or CS_VREDRAW;
MyWndClass.lpfnWndProc := @WndProc;
MyWndClass.cbClsExtra := 0;
MyWndClass.cbWndExtra := 0;
MyWndClass.hInstance := HInstance;
MyWndClass.hIcon := LoadIcon(0, IDI_QUESTION);
MyWndClass.hCursor := LoadCursor(0, IDC_ARROW);
MyWndClass.hbrBackground := HBRUSH(GetStockObject(WHITE_BRUSH));
MyWndClass.lpszMenuName := nil;
MyWndClass.lpszClassName := 'MyWindowClass'; RegisterClass(MyWndClass); hWnd := CreateWindow('MyWindowClass', '这是窗口标题', WS_OVERLAPPEDWINDOW,
100, 100, 250, 150, 0, 0, HInstance, nil); ShowWindow(hWnd, SW_SHOWNORMAL);
UpdateWindow(hWnd); while(GetMessage(Msg, 0, 0, 0)) do
begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end.我现在想实现的效果是,创建一个窗体,以c:\1.jpg或bmp作为背景图片显示.. 关于方法貌似是写在WM_ERASEBKGND消息当中.. 约束就是: 不使用资源文件的图片,不引用Graphics单元.尽量保持体积小.
Windows, Messages;{等待调用的过程, 用于在窗体上绘制文本}
Procedure OnPaint(h: HDC);
const
s = 'CodeGear Delphi 2007';
begin
TextOut(h, 10, 10, PChar(s), Length(s));
end;{窗口回调过程}
function WndProc(wnd: HWND; msg: UINT; wParam: Integer; lParam: Integer): Integer; stdcall;
var
Handle: HDC;
ps: PAINTSTRUCT;
begin
case msg of
WM_PAINT: begin
Handle := BeginPaint(wnd, ps);
OnPaint(Handle);
EndPaint(wnd, ps);
result := 0;
end;
WM_DESTROY: begin
PostQuitMessage(0);
result := 0;
end;
else
Result := DefWindowProc(wnd, msg, wParam, lParam);
end;
end;{主程序}
var
hWnd : THandle;
Msg : TMsg;
MyWndClass : TWndClass;
begin
MyWndClass.style := CS_HREDRAW or CS_VREDRAW;
MyWndClass.lpfnWndProc := @WndProc;
MyWndClass.cbClsExtra := 0;
MyWndClass.cbWndExtra := 0;
MyWndClass.hInstance := HInstance;
MyWndClass.hIcon := LoadIcon(0, IDI_QUESTION);
MyWndClass.hCursor := LoadCursor(0, IDC_ARROW);
MyWndClass.hbrBackground := HBRUSH(GetStockObject(WHITE_BRUSH));
MyWndClass.lpszMenuName := nil;
MyWndClass.lpszClassName := 'MyWindowClass'; RegisterClass(MyWndClass); hWnd := CreateWindow('MyWindowClass', '这是窗口标题', WS_OVERLAPPEDWINDOW,
100, 100, 250, 150, 0, 0, HInstance, nil); ShowWindow(hWnd, SW_SHOWNORMAL);
UpdateWindow(hWnd); while(GetMessage(Msg, 0, 0, 0)) do
begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end.我现在想实现的效果是,创建一个窗体,以c:\1.jpg或bmp作为背景图片显示.. 关于方法貌似是写在WM_ERASEBKGND消息当中.. 约束就是: 不使用资源文件的图片,不引用Graphics单元.尽量保持体积小.
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Procedure OnPaint(h: HDC);
内
第二步:将Form1的FormStyle设置为fsMDIForm,设置成MDI的主窗口。
第三步:在Form1上增加一个Image元件,并选择要设置的背景到Image的Picture中。
第四步:在Form1的Private中定义:
FClientInstance,
FPrevClientProc : TFarProc;
PROCEDURE ClientWndProc(VAR Message: TMessage);
第五步:在实现(implementation)中加入上述过程的具体内容:
PROCEDURE TForm1.ClientWndProc(VAR Message: TMessage);
VAR
MyDC : hDC;
Ro, Co : Word;
begin
with Message do
case Msg of
WM_ERASEBKGND:
begin
MyDC := TWMEraseBkGnd(Message).DC;
FOR Ro := 0 TO ClientHeight DIV Image1.Picture.Height DO
FOR Co := 0 TO ClientWIDTH DIV Image1.Picture.Width DO
BitBlt(MyDC, Co*Image1.Picture.Width, Ro*Image1.Picture.Height,
Image1.Picture.Width, Image1.Picture.Height,
Image1.Picture.Bitmap.Canvas.Handle, 0, 0, SRCCOPY);
Result := 1;
end;
else
Result := CallWindowProc(FPrevClientProc, ClientHandle, Msg, wParam, lParam);
end;
end;第六步:在Form1的创建事件中加入:
FClientInstance := MakeObjectInstance(ClientWndProc);
FPrevClientProc := Pointer(GetWindowLong(ClientHandle, GWL_WNDPROC));
SetWindowLong(ClientHandle, GWL_WNDPROC, LongInt(FClientInstance));上面的步骤已经完成了MDI主窗口背景图案的设置,下面可以增加一个MDIChild窗口,实现MDI程序。第七步:新增加一个Form,并将FormStyle设置为fsMDIChild。现在你可以编译运行这个程序,你会发现,Image元件并不会在Form上显示出来,但是整个Form的客户区域被Image中的图像所铺满。
var
bmp: HBITMAP;function WndProc(wnd: HWND; msg: UINT; wParam: Integer; lParam: Integer): Integer; stdcall;
var
tbmp: TBitmap;
rect: TRect;
mdc: HDC;
Handle: HDC;
ps: PAINTSTRUCT;
begin
case msg of
WM_CREATE:
bmp := LoadImage(0, 'images\Wallpaper.bmp', IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
WM_PAINT: begin
Handle := BeginPaint(wnd, ps);
mdc := CreateCompatibleDC(Handle);
SelectObject(mdc, bmp);
SetStretchBltMode(dc, COLORONCOLOR);
GetObject(bmp, SizeOf(TBitmap), @tbmp);
GetClientRect(wnd, rect);
StretchBlt(dc, 0, 0, rect.Right, rect.Bottom, mdc, 0, 0, tbmp.bmWidth, tbmp.bmHeight, SRCCOPY);
DeleteDC(mdc);
OnPaint(Handle);
EndPaint(wnd, ps);
result := 0;
end;
WM_DESTROY: begin
DeleteObject(bmp);
PostQuitMessage(0);
result := 0;
end;
else
Result := DefWindowProc(wnd, msg, wParam, lParam);
end;
end;
[错误] imager.pas(35): Undeclared identifier: 'OnPaint' 请问这些该怎么定义呢? OnPaint 是个函数吧?. 内容怎么写? 还有:tbmp.bmWidth, tbmp.bmHeight 我改为:tbmp.Width和tbmp.Height就对了.
dc应该改为Handle吧。
OnPaint应该是procedure OnPaint(Handle: HDC);
写成tbmp: Windows.TBitmap;