用C++Builder开拓Windows屏保
副标题#e#
摘要:本文通过一个详细的措施演示了Windows下的屏幕掩护措施的实现进程。
一. 引言
视窗系统下的屏幕掩护措施是一个基于呼吁行(Command Line)的应用措施。当屏保措施被挪用时操纵系统就用详细的呼吁行执行该措施。本文组织和处理惩罚了所有的呼吁行,包罗“/p”,“/s”,“/c”,“/a”,个中“/p”暗示让屏保在预览窗口中显示;“/s”暗示真正运行屏保;“/c”暗示挪用配置对话框;而“/a”暗示挪用暗码配置对话框(WinNT中无效)。本措施尽大概简朴地实现一个全成果的屏保,运行Windows的屏保配置措施时你既可以修改暗码(WinNT中无效)又可以配置图片显示的频率并把频率数值生存到注册内外。当屏保运行时图片以你配置的频率改变显示位置。笔者还留了个功课给读者,请看图1中的选择图片文件夹这个项目,按下欣赏按钮可以配置图片的路径,笔者已经实现了欣赏按钮的成果并
把获得的路径也生存到注册表中,并让屏保启动时读picdir的值,picdir便是"no"时的代码笔者已实现了,picdir不便是"no"时的代码由读者实现。也就是让读者实现一个能把picdir目次里的图片轮番显示的屏保措施。
二. 实现要领
首先先容几个API函数。
WinMain函数:
int WINAPI WinMain(
HINSTANCE hInstance, // 当前实例句柄
HINSTANCE hPrevInstance, // 前一个实例句柄
LPSTR lpCmdLine, // 指向呼吁行参数的指针(本措施要操作的参数)
int nCmdShow // 窗口的状态
);
GetWindowLong函数:获得指定窗口信息的函数
LONG GetWindowLong(
HWND hWnd, //窗/口句柄
int nIndex //指/定返回的信息
);
SetWindowLong函数:改变窗口属性
LONG SetWindowLong(
HWND hWnd, //窗/口句柄
int nIndex, // 指定要设定的值的信息
LONG dwNewLong // 新值
);
SetParent函数:改变指定窗口的父窗口
HWND SetParent(
HWND hWndChild, //要/改变父窗体的窗口句柄
HWND hWndNewParent //新/的父窗体的句柄
);
GetClientRect函数:获得窗口的客户区
BOOL GetClientRect(
HWND hWnd, // 窗口句柄
LPRECT lpRect //RECT/布局的地点
);
SetWindowPos函数:改变窗口的巨细,位置,顶级窗口等
BOOL SetWindowPos(
HWND hWnd, // 窗口句柄
HWND hWndInsertAfter, // 部署窗口顺序的句柄(Z order)
int X, // horizontal position
int Y, // vertical position
int cx, // width
int cy, // height
UINT uFlags // 窗口位置等标志
);
SystemParametersInfo函数:会见或配置系统级的参数
BOOL SystemParametersInfo(
UINT uiAction, // 指定要获取或配置的系统参数
UINT uiParam, // depends on action to be taken
PVOID pvParam, // depends on action to be taken
UINT fWinIni // 用户设置文件是否改变标志
);
ShowCursor函数:显示或埋没光标
int ShowCursor(
BOOL bShow // 鼠标可见度标志
);
GetVersion函数:获取系统的版本信息
DWORD GetVersion(VOID)
#p#副标题#e#
以上API函数的详细信息可以查找有关MSSDK文档。相识了根基函数后笔者简述一下实现要领。
1. 新建一工程,增加两个窗体,将三个窗体别离取名为MainForm,FrmConfig,FrmControl。在MainForm和FrmControl窗体上各添加一个Timer控件和TImage控件,把两窗体的BorderStyle设为bsNone,配景致设为玄色。在两个窗体的TImage上各加一张图片,FrmControl巨细设为:高130像素,宽160像素,Timage的Stretch属性设为真值。FrmConfig的样式如图1。
2. 生存工程文件为screensaver.cpp,其它单位别离存为Unitmain.cpp,
Unitcontrol.cpp,Unitconfig.cpp。
3. 编写代码,详细代码见第三部门的源措施。
4. 编译成可执行文件,并把文件扩展名改为scr。
5. 最后把屏保措施拷贝到windows目次下就可以测试了。假如一切正常的话你将会看
到图片在屏幕上以随机的位置显示。
三. 源代码
以下是本措施的所有的源代码,个中screensaver.cpp, Unitmain.cpp是焦点代码。
/*{*******************************}*/
/*{***** screensaver.cpp ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#include
#pragma hdrstop
USERES("screensaver.res");
USEFORM("Unitmain.cpp", Frmmain);
USEFORM("Unitconfig.cpp", FrmConfig);
USEFORM("Unitcontrol.cpp", FrmControl);
//---------------------------------------------------------------------------/
WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR p, int)//“p"是指向呼吁行参数的指针
{ String StartType;
AnsiString Command=p,temp;
HWND CPWindow =NULL;
if(Command=="")
StartType = "/c";
else
StartType=Command.SubString(1,2);//获取呼吁行的前两个参数
try
{
Application->Initialize();
if(StartType=="/c")//启动配置窗口
Application->CreateForm(__classid(TFrmConfig), &FrmConfig);
else if(StartType=="/s")启动屏保
Application->CreateForm(__classid(TFrmmain), &Frmmain);
else if(StartType=="/p")//预览
{
Application->CreateForm(__classid(TFrmControl), &FrmControl);
temp=Command.SubString(3,Command.Length()-2);//获取呼吁行中的屏保预览窗口句柄的字符串形式
CPWindow =(long *)temp.ToInt();//将预览窗口句柄的字符串形式强制转换为长整形指针
RECT *lookrect;//成立一个RECT布局指针
Long style=GetWindowLong(Application->MainForm->Handle,GWL_STYLE);//获取FrmControl窗口的气势气魄
style=style|WS_CHILD;
SetWindowLong(Application->MainForm->Handle,GWL_STYLE,style);//配置窗口为子窗口
SetParent(Application->MainForm->Handle,CPWindow);//配置屏保预览窗口为FrmControl的父窗口
GetClientRect(CPWindow,lookrect);//获取屏保预览窗口的客户区
SetWindowPos(Application->MainForm->Handle,HWND_TOP,0,0,lookrect->right,lookrect->bottom ,SW
P_NOZORDER|SWP_NOACTIVATE|SWP_SHOWWINDOW);//将FrmControl的窗口包围屏保预览窗口的客户区,并显示它
}
else if(StartType=="/a")//启动暗码配置窗口
{
temp=Command.SubString(3,Command.Length()-2);
CPWindow =(long *)temp.ToInt();//以下是动态挪用mpr.dll里的PwdChangePasswordA函数的进程
typedef UINT(CALLBACK *FUN)(LPSTR,HWND,UINT,UINT);
HINSTANCE hDll=LoadLibrary("mpr.DLL");
FUN myfun;
if(hDll!=NULL)
{
myfun=(FUN)GetProcAddress(hDll,"PwdChangePasswordA");
if(!myfun)FreeLibrary(hDll);
else
myfun("SCRSAVE", CPWindow, 0, 0);//函数的挪用
}
}
Application->Run();
}
catch (Exception &exception)
{
Application->ShowException(&exception);
}
return 0;
}
//---------------------------------------------------------------------------/
/*{*******************************}*/
/*{***** Unitmain.h ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#ifndef UnitmainH
#define UnitmainH
//---------------------------------------------------------------------------/
#include
#include
#include
#include
#include
#include
#include
//---------------------------------------------------------------------------/
class TFrmmain : public TForm
{
__published: // IDE-managed Components
TTimer *Timer1;
TImage *Image1;
void __fastcall FormCreate(TObject *Sender);
void __fastcall FormKeyDown(TObject *Sender, WORD &Key,
TShiftState Shift);
void __fastcall FormMouseDown(TObject *Sender, TMouseButton Button,
TShiftState Shift, int X, int Y);
void __fastcall FormCloseQuery(TObject *Sender, bool &CanClose);
void __fastcall FormClose(TObject *Sender, TCloseAction &Action);
void __fastcall Image1MouseDown(TObject *Sender,
TMouseButton Button, TShiftState Shift, int X, int Y);
void __fastcall Image1MouseMove(TObject *Sender, TShiftState Shift,
int X, int Y);
void __fastcall Timer1Timer(TObject *Sender);
private: // User declarations
DWORD PWProtect;
DWORD Version;
String picdir;
int frequence;
public: // User declarations
__fastcall TFrmmain(TComponent* Owner);
};
//---------------------------------------------------------------------------/
extern PACKAGE TFrmmain *Frmmain;
//---------------------------------------------------------------------------/
#endif
//---------------------------------------------------------------------------/
/*{*******************************}*/
/*{***** Unitmain.cpp ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#include
#pragma hdrstop
#include
#include "Unitmain.h"
#include
//---------------------------------------------------------------------------/
#pragma package(smart_init)
#pragma resource "*.dfm"
TFrmmain *Frmmain;
//---------------------------------------------------------------------------/
__fastcall TFrmmain::TFrmmain(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::FormCreate(TObject *Sender)
{
//使窗口成为最顶层的窗口
SetWindowPos(this->Handle, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE);
//时窗口包围屏幕
this->Width=Screen->Width;
this->Height=Screen->Height;
this->Top=0;
this->Left=0;
Version=GetVersion();
TRegistry *Registry = new TRegistry;
try
{
if(Version>0x80000000){
Registry->RootKey =HKEY_CURRENT_USER;
Registry->OpenKey("\\Control Panel\\Desktop",false);
PWProtect=Registry->ReadInteger("ScreenSaveUsePassword");//检测是否暗码掩护
Registry->CloseKey();}
Registry->RootKey =HKEY_CURRENT_USER;
Registry->OpenKey("\\Software\\CODEHUNTER", true);
picdir=Registry->ReadString("PicDir");//获得图片目次
frequence=Registry->ReadInteger("frequence");//获得图像显示的频率
if(picdir=="")picdir="no";
if(frequence<0||frequence>6) frequence=2;
Timer1->Interval=1000*frequence;配置按时器
}
__finally
{
delete Registry;
picdir="no";
}
//检测是否运行于 NT下
if(Version!=0)
if(PWProtect&&Version>0x80000000)//假如系统要求暗码掩护并此系统为非NT那么把系统设为屏保状态使光标消失
SystemParametersInfo(SPI_SCREENSAVERRUNNING, 1, 0, 0);
while (!ShowCursor(false)< -5);
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::FormKeyDown(TObject *Sender, WORD &Key,
TShiftState Shift)
{
this->Close();
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::FormMouseDown(TObject *Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
this->Close();
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::FormCloseQuery(TObject *Sender, bool &CanClose)
{
if (PWProtect && Version>0x80000000)
{
bool PassChck;
//显/示光标,并挪用暗码对话框
while(!ShowCursor(True) > 5);
//以/下是VerifyScreenSavePwd函数的动态挪用
typedef UINT(CALLBACK *FUN)(HWND);
HINSTANCE hDll=LoadLibrary("password.cpl");
FUN myfun;
if(hDll!=NULL)
{
myfun=(FUN)GetProcAddress(hDll,"VerifyScreenSavePwd");
if(!myfun)FreeLibrary(hDll);
else
PassChck=myfun(this->Handle);
}
if(PassChck == false)
{
while(!ShowCursor(False) < -5);
CanClose = false;
}
}
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::FormClose(TObject *Sender, TCloseAction &Action)
{
while(!ShowCursor(True) > 5);
if(PWProtect&&Version>0x80000000)
SystemParametersInfo(SPI_SCREENSAVERRUNNING, 0, 0, 0);//退出屏保状态
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::Image1MouseDown(TObject *Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
this->Close();
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::Image1MouseMove(TObject *Sender,
TShiftState Shift, int X, int Y)
{ static int MouseMoves=0;
MouseMoves = MouseMoves + 1;
if(MouseMoves >4)
{
this->Close();
MouseMoves = 0 ;
}
}
//---------------------------------------------------------------------------/
void __fastcall TFrmmain::Timer1Timer(TObject *Sender)
{
if(picdir=="no")
{
int i ;
randomize();
i=rand()%2;
if(i==0)
i=-1;
else
i=1;
Image1->Top=i*(rand()%this->Height);
Image1->Left=i*(rand()%this->Width);
}
}
//---------------------------------------------------------------------------/
/*{*******************************}*/
/*{***** Unitcontrol.h ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#ifndef UnitcontrolH
#define UnitcontrolH
//---------------------------------------------------------------------------/
#include
#include
#include
#include
#include
#include
#include
//---------------------------------------------------------------------------/
class TFrmControl : public TForm
{
__published: // IDE-managed Components
TImage *Image1;
TTimer *Timer1;
void __fastcall Timer1Timer(TObject *Sender);
void __fastcall FormCreate(TObject *Sender);
private: // User declarations
public: // User declarations
__fastcall TFrmControl(TComponent* Owner);
};
//---------------------------------------------------------------------------/
extern PACKAGE TFrmControl *FrmControl;
//---------------------------------------------------------------------------/
#endif
//---------------------------------------------------------------------------/
/*{*******************************}*/
/*{***** Unitcontrol.cpp ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#include
#pragma hdrstop
#include "Unitcontrol.h"
//---------------------------------------------------------------------------/
#pragma package(smart_init)
#pragma resource "*.dfm"
TFrmControl *FrmControl;
//---------------------------------------------------------------------------/
__fastcall TFrmControl::TFrmControl(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------/
void __fastcall TFrmControl::Timer1Timer(TObject *Sender)
{
int i ;
randomize();
i=rand()%2;
if(i==0)
i=-1;
else
i=1;
Image1->Top=i*(rand()%this->Height);
Image1->Left=i*(rand()%this->Width);
}
//---------------------------------------------------------------------------/
void __fastcall TFrmControl::FormCreate(TObject *Sender)
{
Image1->Top=0;
Image1->Left=0;
Image1->Height=this->Height ;
Image1->Width=this->Width ;
}
//---------------------------------------------------------------------------/
/*{*******************************}*/
/*{***** Unitconfig.h ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#ifndef UnitconfigH
#define UnitconfigH
//---------------------------------------------------------------------------/
#include
#include
#include
#include
#include
#include
#include
#include
//---------------------------------------------------------------------------/
class TFrmConfig : public TForm
{
__published: // IDE-managed Components
TPanel *Panel1;
TButton *Button1;
TPanel *Panel2;
TLabel *Label1;
TTrackBar *TrackBar1;
TLabel *Label2;
TLabel *Label3;
TLabel *Label4;
TButton *Button2;
void __fastcall Button1Click(TObject *Sender);
void __fastcall Button2Click(TObject *Sender);
private: // User declarations
AnsiString picdir;
int frequence;
public: // User declarations
__fastcall TFrmConfig(TComponent* Owner);
};
//---------------------------------------------------------------------------/
extern PACKAGE TFrmConfig *FrmConfig;
//---------------------------------------------------------------------------/
#endif
//---------------------------------------------------------------------------/
/*{*******************************}*/
/*{***** Unitconfig.cpp ****}*/
/*{*******************************}*/
//---------------------------------------------------------------------------/
#include
#pragma hdrstop
#include "Unitconfig.h"
//---------------------------------------------------------------------------/
#pragma package(smart_init)
#pragma resource "*.dfm"
TFrmConfig *FrmConfig;
//---------------------------------------------------------------------------/
__fastcall TFrmConfig::TFrmConfig(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------/
void __fastcall TFrmConfig::Button1Click(TObject *Sender)
{
if(SelectDirectory("Select Picture Dir","",picdir))
Panel2->Caption=picdir;
}
//---------------------------------------------------------------------------/
void __fastcall TFrmConfig::Button2Click(TObject *Sender)
{
//把信息写入注册表
if(picdir=="") picdir="no";
this->frequence=TrackBar1->Position;
TRegistry *Reg = new TRegistry;
try
{
Reg->RootKey = HKEY_CURRENT_USER;
if (Reg->OpenKey("\\Software\\CODEHUNTER", true))
{
Reg->WriteString("PicDir",picdir);
Reg->WriteInteger("frequence",frequence);
Reg->CloseKey();
}
}
__finally
{
delete Reg;
}
this->Close();
}
//---------------------------------------------------------------------------/