在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
W`_pjld
mL/]an@Y 一、实现方法
=67dpQ'y |g<1n 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
}#}IR5`=E M\O6~UFq! #pragma data_seg("shareddata")
Tap=K|b ]
HHOOK hHook =NULL; //钩子句柄
g
/D@/AU1u UINT nHookCount =0; //挂接的程序数目
VP[-BK[ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
XDs ) static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
;AMbo`YK[ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
os6p1"_\f static int KeyCount =0;
q}gj.@Q" static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
MDn+K#p #pragma data_seg()
{* S8n09v vFz%#zk> 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
e=K2]Y Q{ PkA_uDhw DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
^%l~|w 0!X;C!v; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Y2709LWmP cKey,UCHAR cMask)
i
bAZ*I {
YoiM\gw BOOL bAdded=FALSE;
V#8]io for(int index=0;index<MAX_KEY;index++){
"8MG[$Y if(hCallWnd[index]==0){
^2Sa_. hCallWnd[index]=hWnd;
B;xw @:H HotKey[index]=cKey;
<tkxE!xF`J HotKeyMask[index]=cMask;
AffVah2o: bAdded=TRUE;
tdZ,sHY6 KeyCount++;
*lHI\5 break;
G{$(t\>8 }
:K&> }
@8WG return bAdded;
i(DoAfYf/q }
/MFy%=0l //删除热键
_=W ^#z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~Wy&xs ZH {
f>.A^? BOOL bRemoved=FALSE;
[DrG;k ? for(int index=0;index<MAX_KEY;index++){
Ei!t#'*D< if(hCallWnd[index]==hWnd){
vzD3_
?D if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)9'eckt hCallWnd[index]=NULL;
*>Sb4: HotKey[index]=0;
l%"[857 HotKeyMask[index]=0;
k^3 ?Z2a bRemoved=TRUE;
|O0=Q,<m KeyCount--;
*?jU$&Qpj* break;
s/ [15 }
0tbximmDb }
:M" NB+T }
#hL<9j return bRemoved;
)=VSERs }
K..L8#SC N)'oX3?x 86Q\G.h7 DLL中的钩子函数如下:
}#~@HM>6Z 5Pmmt/Z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
`L<f15][ {
!wH7;tU BOOL bProcessed=FALSE;
@k+Z?Hp if(HC_ACTION==nCode)
qh}M!p2 {
P(?i>F7s if((lParam&0xc0000000)==0xc0000000){// 有键松开
48X;'b,h switch(wParam)
q~*3Bk~ {
I)$` @. case VK_MENU:
e ='bc7$ MaskBits&=~ALTBIT;
lK;/97Ze break;
BLxtS case VK_CONTROL:
gQy{OU MaskBits&=~CTRLBIT;
'VA\dpa{J break;
""`>v`\ case VK_SHIFT:
W[S4s/)mg MaskBits&=~SHIFTBIT;
=Ny&`X#F break;
o6f^DG3* default: //judge the key and send message
w)I!q&`Y break;
0Yz
&aH }
Ao%E]M for(int index=0;index<MAX_KEY;index++){
N<wy"N{iS if(hCallWnd[index]==NULL)
zt/p'khP3 continue;
gb
6 gIFq; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#6g-{OBv {
:`BZ,j_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
b_88o-*/ bProcessed=TRUE;
Kj[X1X5 }
&.k'Dj2hf }
l:NEK`>i }
(WT0j else if((lParam&0xc000ffff)==1){ //有键按下
n99>oh switch(wParam)
bni :B?# {
u@d`$]/>F case VK_MENU:
vUa~PN+Iy MaskBits|=ALTBIT;
Hbogi1!al| break;
I!bzvPJ]xc case VK_CONTROL:
I}oxwc MaskBits|=CTRLBIT;
[\N,ow,n break;
dRg1I=|{_ case VK_SHIFT:
51.! S MaskBits|=SHIFTBIT;
#;. tVo I break;
uS :3Yo default: //judge the key and send message
G'c!82;,? break;
]p3hq1u3& }
$LUNA. for(int index=0;index<MAX_KEY;index++){
h>B>t/k? if(hCallWnd[index]==NULL)
=x
"N0p continue;
2!QS&i if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?_9cFo59: {
/|] %0B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
:CEhc7gU bProcessed=TRUE;
;6aTt2BQ }
"kyy>H9) }
75vd ]45as }
|6LC>' if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
;w1?EdaO for(int index=0;index<MAX_KEY;index++){
':yE5j if(hCallWnd[index]==NULL)
Zyqh continue;
.v[8ie if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Te?UQX7Z}M SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
@DK,ka( //lParam的意义可看MSDN中WM_KEYDOWN部分
[.tqgU }
b{H&%Jx) }
6L@g]f|Y@ }
=!3G ,qV return CallNextHookEx( hHook, nCode, wParam, lParam );
r.M8#YL }
{UT>>
*C p1t9s
N, 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
"El$Sat` 1fRYXqx BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u->UV:u BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]D&$k P( C`OdMM>D 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
TL@_m^SM GIQ/gM?Pv LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2!/*I: {
]dk44,EL if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Y<Y5HI" {
\XwXs5"G //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
@=x=dL( SaveBmp();
Q%4>okj, return FALSE;
) ^PY-~o[ }
aE.T%xR …… //其它处理及默认处理
!!f)w!wW }
@;x|+@r ,c_[`q\ 5}gcJjz 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
30]?Jz6m @V)k*h3r+ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
6TS+z7S81L 2vWJ|&|p 二、编程步骤
>69xl^Gd j eMh 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
#:L|-_=a Uj}iMw, 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
' U {?"FP sAS\-c'6 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
\>nPg5OT l<)(iU 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
k<ds7k1m R^P~iAO 5、 添加代码,编译运行程序。
hf P}+on% #
4`*`)% 三、程序代码
V_Kpb*3 &O5%6Sv3d ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
a
#?%I# #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
"
M8j? #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
FX )g\=ov #if _MSC_VER > 1000
(qHI>3tpY #pragma once
T#?KY #endif // _MSC_VER > 1000
{y=H49 #ifndef __AFXWIN_H__
cX"[#Em# #error include 'stdafx.h' before including this file for PCH
(i>VJr #endif
_m0HgLS~ #include "resource.h" // main symbols
rFZB6A<(] class CHookApp : public CWinApp
5~4I.+~8 {
nab:y(]$/ public:
j y{T=Nb CHookApp();
PH97O`" // Overrides
hu[=9#''$ // ClassWizard generated virtual function overrides
<9eQ //{{AFX_VIRTUAL(CHookApp)
],R rk]1 public:
[qlq& ?" virtual BOOL InitInstance();
yyxGVfr virtual int ExitInstance();
vV.'&."g //}}AFX_VIRTUAL
=UA-&x@ //{{AFX_MSG(CHookApp)
\tLJ( <8 // NOTE - the ClassWizard will add and remove member functions here.
g;w4:k)U // DO NOT EDIT what you see in these blocks of generated code !
^#e:q //}}AFX_MSG
.z7XYmv DECLARE_MESSAGE_MAP()
:6PWU$z$7 };
XLp tJ4~v LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
ya{vR*
'~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*ghkw9/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
s@
m
A\ BOOL InitHotkey();
3WS`,} BOOL UnInit();
i}ypEp #endif
j#y_# z^I"{eT8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
~|@ aV:k #include "stdafx.h"
gt6*x=RCrQ #include "hook.h"
|ap{+ xh #include <windowsx.h>
)ruC_) #ifdef _DEBUG
r|cl6s!P #define new DEBUG_NEW
EaFd1 #undef THIS_FILE
pmB}a7 static char THIS_FILE[] = __FILE__;
'(Uyju= #endif
c`mJrS: #define MAX_KEY 100
b_cnVlN[ #define CTRLBIT 0x04
Y'S xehx #define ALTBIT 0x02
C*ZgjFvB #define SHIFTBIT 0x01
|f'U_nE#R/ #pragma data_seg("shareddata")
enlk)_btp HHOOK hHook =NULL;
Hkg^ UINT nHookCount =0;
6G7B&"& static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
z,}1K! static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
c>{X(Z=2 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
)y'`C@ijI static int KeyCount =0;
r
vVU5zA4H static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
b|n%l5
1 #pragma data_seg()
}b2U o&][ HINSTANCE hins;
-w=rNlj void VerifyWindow();
*fW&-ic BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
IyIh0B~i //{{AFX_MSG_MAP(CHookApp)
rAIX(2@cR_ // NOTE - the ClassWizard will add and remove mapping macros here.
8^&)A b // DO NOT EDIT what you see in these blocks of generated code!
lF5;Kc //}}AFX_MSG_MAP
REB8_ H" END_MESSAGE_MAP()
?(>7v[=iT <|k!wfHL CHookApp::CHookApp()
D}vgXzD {
6Z
~>d;&9 // TODO: add construction code here,
YTQ|Hg6jO // Place all significant initialization in InitInstance
D; H</5#Q }
vTQQd@ ^2|gQ'7< CHookApp theApp;
mJ<rzX LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
RW48>4f/+ {
F*>:~'% BOOL bProcessed=FALSE;
)Ac8'{Tq/ if(HC_ACTION==nCode)
j#Ly!%dp {
5|x&Z/hL if((lParam&0xc0000000)==0xc0000000){// Key up
HnUM:-6 switch(wParam)
e'(n ^_$nl {
kOETx case VK_MENU:
>#*]/t MaskBits&=~ALTBIT;
f'TjR#w break;
sn2SDHY case VK_CONTROL:
?`AzgM[I MaskBits&=~CTRLBIT;
?*K;+@EH break;
f'\I52;FB case VK_SHIFT:
?+D_*'65D MaskBits&=~SHIFTBIT;
Run)E*sf break;
1sYwFr 5 default: //judge the key and send message
HB {w: break;
,f0cy\.? }
N'Ywn}!js for(int index=0;index<MAX_KEY;index++){
HGfYL')Z if(hCallWnd[index]==NULL)
+VDwDJ)lG continue;
99G/(Z} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Df||#u=n {
bPC {4l SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[{6]i J bProcessed=TRUE;
3ypB~bNw }
Sq %BfP)a( }
4?><x[l2{ }
&qz&@!` else if((lParam&0xc000ffff)==1){ //Key down
?{\8!_Gvsl switch(wParam)
k<ku5U1| {
s!nFc{ case VK_MENU:
T5B~CC'6 MaskBits|=ALTBIT;
I|m fr{ break;
g?A4C`l6iy case VK_CONTROL:
J*U,kyYF MaskBits|=CTRLBIT;
5oGnPF break;
v+znKpE case VK_SHIFT:
zOLt)2-< MaskBits|=SHIFTBIT;
hZY+dHa] break;
eg~$WB;1 default: //judge the key and send message
vlw2dY@^ break;
/8q7pwV }
+>KWYPH for(int index=0;index<MAX_KEY;index++)
U&C\5N] {
^>h
9< if(hCallWnd[index]==NULL)
j^llO1i/ continue;
3T# zxu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ayc}uuu {
P-K\)65{Y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
!O@qqg(> bProcessed=TRUE;
uKo)iB6D }
_jy*`$"q( }
,@R~y }
m0paGG if(!bProcessed){
Jh{(xGA for(int index=0;index<MAX_KEY;index++){
^TVica if(hCallWnd[index]==NULL)
L q'*B9 continue;
x@m"[u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
L;Nz\sJ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
F:n(yXA }
YgQ_P4B; }
} !pC}m }
$7jJV (B return CallNextHookEx( hHook, nCode, wParam, lParam );
0h^upB#p }
w?Nvm?_] qXt2m BOOL InitHotkey()
%LXk9K^]e {
t&mw@bj if(hHook!=NULL){
Z7JI4" nHookCount++;
*^=`HE89S return TRUE;
llhJ,wD }
7Nh6 ` else
_I<eJ\ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
/_xwHiA if(hHook!=NULL)
mdypZ 1f_ nHookCount++;
Y{1IRP?S return (hHook!=NULL);
X4BDl }
pJ6bX4QnDX BOOL UnInit()
WUQ2[)< {
Za jQ B if(nHookCount>1){
AQ32rJT8c` nHookCount--;
1jh^-d5 return TRUE;
I/|)? }
~kS~v BOOL unhooked = UnhookWindowsHookEx(hHook);
"6Nma)8 if(unhooked==TRUE){
n/pM[gI nHookCount=0;
UN`-;! hHook=NULL;
_;yp^^S }
~uq J@#o{ return unhooked;
7{D+\i }
o83HR[ ym2\o_^( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-qs.'o
;2 {
5L42'gJ BOOL bAdded=FALSE;
FxKH?Rl for(int index=0;index<MAX_KEY;index++){
|m"2B]"@ if(hCallWnd[index]==0){
2xni! *T+ hCallWnd[index]=hWnd;
IA&((\YC HotKey[index]=cKey;
}{ pNasAU HotKeyMask[index]=cMask;
A*n '"+_ bAdded=TRUE;
r*>XkM& M KeyCount++;
y{?
6U>_ break;
hDl& K E }
NjdAfgA }
-J:](p return bAdded;
G-Sw`HHo }
e3F)FTG& #fG!dD42 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
b^y#.V.|k {
.m7iXd{ BOOL bRemoved=FALSE;
*Y9"-C+ for(int index=0;index<MAX_KEY;index++){
<gZC78}E if(hCallWnd[index]==hWnd){
&Km?(%? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
c<A@Op"A hCallWnd[index]=NULL;
\qUmdN{FU HotKey[index]=0;
b&*^\hY9b HotKeyMask[index]=0;
NqkRR$O bRemoved=TRUE;
Q6MDhv, KeyCount--;
_R8)%<E break;
:&2RV_$>= }
.o:Pe2C }
QP7EP aW }
~Msee+ZZ : return bRemoved;
rP2^D[uM. }
MGX,JW>L )UI T'*ow void VerifyWindow()
UrH^T;# {
*B)>5r for(int i=0;i<MAX_KEY;i++){
&%fy if(hCallWnd
!=NULL){ kR-N9|>i
if(!IsWindow(hCallWnd)){ WyA>OB<Zeq
hCallWnd=NULL; mf,mKgfG
HotKey=0; X~ P0Q
HotKeyMask=0; [k@D}p
x
KeyCount--; @gE
+T37x2
} ok-sm~ bp
} n4>
} >`5iq.v
} n2Dnpe:
+_Fsiu_b
BOOL CHookApp::InitInstance() 5|r3i \
{ 8$v17 3
AFX_MANAGE_STATE(AfxGetStaticModuleState()); P;MS%32
hins=AfxGetInstanceHandle(); fk*JoR.o
InitHotkey(); L;,Nh
return CWinApp::InitInstance(); q0`Vw%
} q_OIzZ@
/w_Sc{
int CHookApp::ExitInstance() H^K(1
{ qoB
VerifyWindow(); O*H:CW
UnInit(); MZ=U}
&F
return CWinApp::ExitInstance(); }UXj|SY
} x@v,qF$K
WB6g i2
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file KT{<iz_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RNRMw;cT
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ E0ud<'3<
#if _MSC_VER > 1000 /B|#GJ\\3
#pragma once #c+N}eX{
#endif // _MSC_VER > 1000 KKGAk\X
YDi_Gl$
class CCaptureDlg : public CDialog oxPOfI1%]
{ v^[tK2&v
// Construction .{5)$w>
public: wCMsaW
BOOL bTray; Z)P x6\?+
BOOL bRegistered; L(`^T`
BOOL RegisterHotkey(); Yah3I@xGy
UCHAR cKey; @o9EX }
UCHAR cMask; []3xb`<&
void DeleteIcon(); #mk#&i3"k
void AddIcon(); *vJ1~SRV
UINT nCount; ?F
AsV&y
void SaveBmp(); qAR~js`5
CCaptureDlg(CWnd* pParent = NULL); // standard constructor eU@yw1N
// Dialog Data U6jlv3
//{{AFX_DATA(CCaptureDlg) %dw-}1X
enum { IDD = IDD_CAPTURE_DIALOG }; W$:;MY>0f
CComboBox m_Key; wE%v[q[*X
BOOL m_bControl; JF: QQ\
BOOL m_bAlt; B V+"uF
BOOL m_bShift; ~M(K{6R
CString m_Path; [xO^\oQa=c
CString m_Number; x"8(j8e
//}}AFX_DATA mC>7l7%
// ClassWizard generated virtual function overrides 1_7x'5GdA
//{{AFX_VIRTUAL(CCaptureDlg) TjD`<k
public: %j2YCV7
virtual BOOL PreTranslateMessage(MSG* pMsg); eK/[jxNO
protected: =c-j4xna>
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JP!$uK{u
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7<IrN\@U
//}}AFX_VIRTUAL bxkp9o
// Implementation FxM`$n~K
protected: HY5g>wv@
HICON m_hIcon; (}4tj4d
// Generated message map functions MyCX6+Ci)
//{{AFX_MSG(CCaptureDlg) @,M !&l
virtual BOOL OnInitDialog(); P8DJv-f`
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 8@6:UR.)
afx_msg void OnPaint(); ^5=}Y>EJO
afx_msg HCURSOR OnQueryDragIcon(); 0J@)?,V-.
virtual void OnCancel(); k W/3
Aq7r
afx_msg void OnAbout(); ORcl=Eo>
afx_msg void OnBrowse(); tq<7BO<6
afx_msg void OnChange(); W>wE8? _,
//}}AFX_MSG ?h1]s&^|2
DECLARE_MESSAGE_MAP() hP3I_I[qF}
}; 5{,/m"-
#endif UgSSZ05Lq
W
qci51y>#
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )P:TVe9`
#include "stdafx.h" u6t.$a!5
#include "Capture.h" pL-p
#include "CaptureDlg.h" ecA0z
c~
#include <windowsx.h> B
wtD!de$
#pragma comment(lib,"hook.lib") COJqVC(#
#ifdef _DEBUG -H Zvz[u
#define new DEBUG_NEW }`f%"Z
#undef THIS_FILE )w;XicT
static char THIS_FILE[] = __FILE__; qZKU=HM
#endif t+m$lqm
#define IDM_SHELL WM_USER+1 aWOApXJ
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^YenS6`F
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~`T(mh',
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ZzzQXfA#
class CAboutDlg : public CDialog @L{HT8utK3
{ +;:i,`Lmg
public: Q&`$:h.~
CAboutDlg(); LtejLCf/
// Dialog Data "F"G(ba^
//{{AFX_DATA(CAboutDlg) !?O:%QG
enum { IDD = IDD_ABOUTBOX }; z[ z'.{;D
//}}AFX_DATA p*#SSR9<
// ClassWizard generated virtual function overrides [7|}h/
//{{AFX_VIRTUAL(CAboutDlg) =]-!
protected: c!{.BgGN
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dfc-#I
p?
//}}AFX_VIRTUAL FEU$D\1y
// Implementation Lkqu"V
protected: 2x$\vL0
//{{AFX_MSG(CAboutDlg) (tyo4Tz1
//}}AFX_MSG (V{bfDu&h@
DECLARE_MESSAGE_MAP() xx!o]D-}
}; {< jLfL1
%J~8a _vO
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]~3wq[O
{ zHDC8m
//{{AFX_DATA_INIT(CAboutDlg) 9OF5A<%"u
//}}AFX_DATA_INIT {YK6IgEsJe
} Z0b1E
5 xTm]
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _V-@95fK
{ u"X8(\pOn
CDialog::DoDataExchange(pDX); >@h0@N
//{{AFX_DATA_MAP(CAboutDlg) (;~[}"
//}}AFX_DATA_MAP s8@f Z4
} MZv&$KG4m@
t8]u#bx"?
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oo-^BG
//{{AFX_MSG_MAP(CAboutDlg) cO)GiWE
// No message handlers
?o9l{4~g
//}}AFX_MSG_MAP cS QUK
END_MESSAGE_MAP() WDE_"Mm
<mrLld#_:C
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9DKmXL
: CDialog(CCaptureDlg::IDD, pParent) $AG.<
{ #\%GrtM
//{{AFX_DATA_INIT(CCaptureDlg) t~sW]<qjp
m_bControl = FALSE; MT%ky
m_bAlt = FALSE; s![=F}ck
m_bShift = FALSE; <`-"K+e!J
m_Path = _T("c:\\"); CEqfsKrsxE
m_Number = _T("0 picture captured."); 1hi^
nCount=0; Ls*.=ARq
bRegistered=FALSE; @_N -> l
bTray=FALSE; aH'^`]'_=
//}}AFX_DATA_INIT /\
~{
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V%Y.N4H
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); zrnc~I+
} ax>en]rNP
]y-r
I
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) cpu+"/\
{ >4LX!^V"
CDialog::DoDataExchange(pDX); I`Rxijz
//{{AFX_DATA_MAP(CCaptureDlg) )bPNL$O
DDX_Control(pDX, IDC_KEY, m_Key); u`E_Q8
DDX_Check(pDX, IDC_CONTROL, m_bControl); Q`r1pO
DDX_Check(pDX, IDC_ALT, m_bAlt); *J1pxZ^
DDX_Check(pDX, IDC_SHIFT, m_bShift); *DDfdn
DDX_Text(pDX, IDC_PATH, m_Path); IGu*#>h
DDX_Text(pDX, IDC_NUMBER, m_Number);
,2 &'8:B
//}}AFX_DATA_MAP RDzL@xCcn
} '["Y;/>
=wS:)%u
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z-krL: A
//{{AFX_MSG_MAP(CCaptureDlg) ]vKxgfF
ON_WM_SYSCOMMAND() .u
W_(Rqg
ON_WM_PAINT() gj6"U{D
ON_WM_QUERYDRAGICON() yMX4 f
ON_BN_CLICKED(ID_ABOUT, OnAbout) %4n=qK9T5
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ZPZ1
7-
ON_BN_CLICKED(ID_CHANGE, OnChange) [r^f5;Z
//}}AFX_MSG_MAP #?}Y~Oe
END_MESSAGE_MAP() Y$oBsg\v
8ne5 B4
BOOL CCaptureDlg::OnInitDialog() 6\~m{@
{ M 80U s.
CDialog::OnInitDialog(); iDHmS6_c
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); r)U9u 0
ASSERT(IDM_ABOUTBOX < 0xF000); pxDZ}4mOh
CMenu* pSysMenu = GetSystemMenu(FALSE); `z+:Z>>
if (pSysMenu != NULL) U?xl%qF`)
{ G>#L
CString strAboutMenu; kE6\G}zj
strAboutMenu.LoadString(IDS_ABOUTBOX); #cjB <APY
if (!strAboutMenu.IsEmpty()) #BT=
K
{ UT[KwM{y
pSysMenu->AppendMenu(MF_SEPARATOR);
JhB{aW>
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {oz04KGsH
} v oC<
/}E
} |mMW"(~
SetIcon(m_hIcon, TRUE); // Set big icon tkNuM0
SetIcon(m_hIcon, FALSE); // Set small icon ':.d,x)
m_Key.SetCurSel(0); LjxTRtB_
RegisterHotkey(); F\,3z7s
CMenu* pMenu=GetSystemMenu(FALSE); Y`lC4*g
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); MzJ5_}
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <;v{`@\j{
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); x6:$lZ(
return TRUE; // return TRUE unless you set the focus to a control "* 'rzd
} w5qhKu!1
v[F_r
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;Y K^&!N
{ 6@Eip[e
if ((nID & 0xFFF0) == IDM_ABOUTBOX) .z+QyNc:
{ )I!l:!Ij*D
CAboutDlg dlgAbout; 8MW|CM4Q
dlgAbout.DoModal(); p9l&K/
} \% ^<Ll
else g*Cs/w
{ 2Ybz`O!
CDialog::OnSysCommand(nID, lParam); ,:=E+sS
} "#[Y[t\Ia
} x`C;
k`\DC\0RG
void CCaptureDlg::OnPaint() CgEeO,N]j
{ 7p u*/W~
if (IsIconic()) FUq@
dUv
{ 9W'#4
CPaintDC dc(this); // device context for painting ?+`Zef.g
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3z~zcQ^\
// Center icon in client rectangle @X1>Wv|[
int cxIcon = GetSystemMetrics(SM_CXICON); "b -KVZ
int cyIcon = GetSystemMetrics(SM_CYICON); o Q{gh$6*
CRect rect; 0m*0I>
GetClientRect(&rect); *pI3"_
int x = (rect.Width() - cxIcon + 1) / 2; 2"V?+Hhz
int y = (rect.Height() - cyIcon + 1) / 2; #c?\(qjWA
// Draw the icon tw*qlb FHv
dc.DrawIcon(x, y, m_hIcon); )O2^?Q quS
} _NqEhf:8
else "%>/rh2Iq
{ YW/YeID
CDialog::OnPaint(); 3fM
} HC!$Z`}Y
} RJBNY;0
C(W?)6?
HCURSOR CCaptureDlg::OnQueryDragIcon() IybMO5Mwn
{ yKfRwO[j
return (HCURSOR) m_hIcon; ;=UrIA@y;=
} O- r"G
[@>Kd`!'
void CCaptureDlg::OnCancel() zFQxW4G
{ 6PJ0iten
if(bTray) ;O{AYF?,N
DeleteIcon(); .bnoK
CDialog::OnCancel(); CXA)Zl5#
} fyQAQZT
=>ph\
void CCaptureDlg::OnAbout() !7 *X{D v
{ 4fpz;2%
CAboutDlg dlg; B.&q]CAv-
dlg.DoModal(); o{zo-:>Jp
} {I(Euk>lR
K6|*-Wo.
void CCaptureDlg::OnBrowse() 'lIT7MK
{ :/Sx\Nz78
CString str; )(75dUl
BROWSEINFO bi; eJJvEvZ,
char name[MAX_PATH]; }tj@*n_
ZeroMemory(&bi,sizeof(BROWSEINFO)); a*%>H(x
bi.hwndOwner=GetSafeHwnd(); Ce`{M&NSWX
bi.pszDisplayName=name; jsi\*5=9p<
bi.lpszTitle="Select folder"; *W#x#0j
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9>%f99n
LPITEMIDLIST idl=SHBrowseForFolder(&bi); PlBT
H
if(idl==NULL) 'SOp!h$
return; ULQ*cW&;?
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2}509X(*
str.ReleaseBuffer(); jF-z?
m_Path=str; 5QMu=/
if(str.GetAt(str.GetLength()-1)!='\\') | LfH,6
m_Path+="\\"; H;IG\k6C
UpdateData(FALSE); 4b6$Mj
} (* "R"Y
0v',+-
void CCaptureDlg::SaveBmp() &XgB-}^:
{ ,{:5Z:<|
CDC dc; Fwho.R-.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); -Z6ot{%
CBitmap bm; 5:56l>0
int Width=GetSystemMetrics(SM_CXSCREEN); #l:qht
int Height=GetSystemMetrics(SM_CYSCREEN); ]j_S2lt
bm.CreateCompatibleBitmap(&dc,Width,Height); hc~--[1c:
CDC tdc; Hh54&YKZ
tdc.CreateCompatibleDC(&dc); mC J/gWDY
CBitmap*pOld=tdc.SelectObject(&bm); =_Qt&B)
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); WR~uy|mX
tdc.SelectObject(pOld); G%rK{h
BITMAP btm; =%$ _)=}J
bm.GetBitmap(&btm); 52-^HV
DWORD size=btm.bmWidthBytes*btm.bmHeight; W%~ S~wx
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); VA2%2g2n{
BITMAPINFOHEADER bih; o.Q|%&1
bih.biBitCount=btm.bmBitsPixel; Isoqs(Oi
bih.biClrImportant=0; #7gOtP#{
bih.biClrUsed=0; &\c$s
bih.biCompression=0; #sNa}292"
bih.biHeight=btm.bmHeight; i"|'p/9@q
bih.biPlanes=1; )t@OHSl
bih.biSize=sizeof(BITMAPINFOHEADER); w*Kw#m'U
bih.biSizeImage=size; cWh Aj>?_Q
bih.biWidth=btm.bmWidth; $K;4=zN>t:
bih.biXPelsPerMeter=0; IVEvu3
bih.biYPelsPerMeter=0;
`db++Z'C
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OL=IUg"
static int filecount=0; $@Hw DRP
CString name; p?8>9
name.Format("pict%04d.bmp",filecount++); :
<m0
GG
name=m_Path+name; AO/J:`
BITMAPFILEHEADER bfh; i3#]_ p{
bfh.bfReserved1=bfh.bfReserved2=0; yUNl)E
bfh.bfType=((WORD)('M'<< 8)|'B'); vxbO>c
bfh.bfSize=54+size; V-J\!CHX
bfh.bfOffBits=54; #T
!YFMh;
CFile bf; |{ *ce<ip5
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }$g5:k!
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?^,GaZ^V
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <}i\fJX6
bf.WriteHuge(lpData,size); 80:na7$)#
bf.Close(); [f-
#pew
nCount++; Cn+TcdHX
} c;(}Ih(#
GlobalFreePtr(lpData); ;k!Ej-(
if(nCount==1) qYbod+UX
m_Number.Format("%d picture captured.",nCount); ^#gGA_H
else \n+`~< i
m_Number.Format("%d pictures captured.",nCount); ]iPTB
UpdateData(FALSE); _0Wdm*
} -,zNFC:6g
!~>u\h
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :Wb+&|dU
{ EY> %#0
if(pMsg -> message == WM_KEYDOWN) kiqq_`66
{ .F%RW8=Q
if(pMsg -> wParam == VK_ESCAPE) E%/E%9-7\
return TRUE; U
.e Urzu
if(pMsg -> wParam == VK_RETURN) RZDZ3W(;h
return TRUE; 8FbBv"LI,g
} J*$ !^\s
return CDialog::PreTranslateMessage(pMsg); *B@<{x r
} +a;:7[%&
Qv']*C[!z
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nA%-<
{ k('2K2P
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |A5]hL
SaveBmp(); gqGl>=.m
return FALSE; 9) mJo(
} AL,|%yup
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7j._3'M=Kc
CMenu pop; K$f~Fft
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ob-be2EysH
CMenu*pMenu=pop.GetSubMenu(0); `?`\!uP"
pMenu->SetDefaultItem(ID_EXITICON); ?vM{9!M
CPoint pt; Y }e$5
GetCursorPos(&pt); Xj|j\2$ 0
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;QW)tv.y
if(id==ID_EXITICON) 3%k@,Vvt
DeleteIcon(); FnL~8otPF'
else if(id==ID_EXIT) |A0kbC.
OnCancel(); 3osAWSCEL
return FALSE; okr'=iDg
} o2F6K*u}
LRESULT res= CDialog::WindowProc(message, wParam, lParam); //|9J(B]
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >&BgF*mm
AddIcon(); \s+<w3
return res; JnPA; 1@/
} bzB9u&
@I_A(cr
void CCaptureDlg::AddIcon() Etn]e;z4
{ !K6: W1
NOTIFYICONDATA data; W99Fb+$I
data.cbSize=sizeof(NOTIFYICONDATA); E~{-RZNK
CString tip; /:C"n|P7Z
tip.LoadString(IDS_ICONTIP); 7F.>M
data.hIcon=GetIcon(0); *|hICTWL
data.hWnd=GetSafeHwnd(); \XmtSfFC
strcpy(data.szTip,tip); d4A}BTs1
data.uCallbackMessage=IDM_SHELL; 6t*=.b,N
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8fZ\})t
data.uID=98; qdO^)uJJ
Shell_NotifyIcon(NIM_ADD,&data); C.(<KV{b
ShowWindow(SW_HIDE); +O9l@X$l=
bTray=TRUE; NoiU5pP
} 1~ZDHfd5
^c.b@BE
void CCaptureDlg::DeleteIcon() Q_M2!qj
{ *>Om3[D
NOTIFYICONDATA data; Z1OX9]##r
data.cbSize=sizeof(NOTIFYICONDATA); Y$Os&t@bu
data.hWnd=GetSafeHwnd();
3nR|*t;
data.uID=98; 1!BV]&,[
Shell_NotifyIcon(NIM_DELETE,&data); w;{k\=W3Ff
ShowWindow(SW_SHOW); zg|yW6l)9
SetForegroundWindow(); 9;JUc0%
ShowWindow(SW_SHOWNORMAL); qlDLZ.
bTray=FALSE; sm\/wlbE
} ,]20I _
PP$Ig2Q
void CCaptureDlg::OnChange() 1AA(qE
{ Yo(8mtYU
RegisterHotkey(); CbK7="48
} /WMG)#kw'
y\)bxmC
BOOL CCaptureDlg::RegisterHotkey() 9lOUE
{ e`8z1r
UpdateData(); gY;N>Yq,C
UCHAR mask=0; e#&[4 tQF
UCHAR key=0; := *>:*.Kb
if(m_bControl) o3}12i S
mask|=4; `| R8WM
if(m_bAlt) )pJ}o&J
mask|=2; ?MO'WB9+JR
if(m_bShift) `4Nc(aUr
mask|=1; `4l>%S8y:
key=Key_Table[m_Key.GetCurSel()]; %3"3OOT7
if(bRegistered){ Gf]oRNP,N
DeleteHotkey(GetSafeHwnd(),cKey,cMask); <1_?.gSi
bRegistered=FALSE; Fv e,&~
} QDxL y aL
cMask=mask; d v@6wp:
cKey=key; 3/]J
i^+
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4 #4kfGoT
return bRegistered; OM2|c}]ZQ
} uyAhN
cS{ l2}E
四、小结 iHQFieZ.E
I%{U~
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。