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:
5
Yf
T
1Xj>kE: 一、实现方法
N#"( 5$.e5y<&( 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:
qL?`l;+ ,ThN/GkSC #pragma data_seg("shareddata")
RNB ha& HHOOK hHook =NULL; //钩子句柄
oUG!=.1}K5 UINT nHookCount =0; //挂接的程序数目
c-gpO|4> static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
x\MzMQ#Bf static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
7C"&f *lEi static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
smTPca)7s static int KeyCount =0;
01/yog static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
!<2%N3l #pragma data_seg()
B %Vz -t
ROc)LCA 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。
x vx+a0 A aHdXlmL 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:
P>s3Rh3: =@EX!]=x BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
u~y0H cKey,UCHAR cMask)
a8wQ, {
N,M[Opm BOOL bAdded=FALSE;
o+j~~P for(int index=0;index<MAX_KEY;index++){
6)_svtg if(hCallWnd[index]==0){
RC>79e/u< hCallWnd[index]=hWnd;
G&2`c\u{ HotKey[index]=cKey;
;H;c Sn5uL HotKeyMask[index]=cMask;
o,yP9~8\ bAdded=TRUE;
1o*eu&@ KeyCount++;
h~R= ?%H[ break;
a(BEm_l3 }
y>YQx\mK }
|MQ_VZ{6 return bAdded;
Q"+)xj }
[x\?._> //删除热键
,KyG^;Riy BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:G\X {
K.T.?ug;: BOOL bRemoved=FALSE;
GjD^\d/ for(int index=0;index<MAX_KEY;index++){
!:<(p if(hCallWnd[index]==hWnd){
#Z)8,N if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
lk?@ =U~ hCallWnd[index]=NULL;
7)U08" HotKey[index]=0;
(o5^@aDr HotKeyMask[index]=0;
V0ig#?] bRemoved=TRUE;
S7Tc9"oqV KeyCount--;
@P@j9yR break;
]W9 {<+& }
aIXN wnq }
> q!:* }
ZP}NFh%,u return bRemoved;
"f5 neW }
#D2.RN Y"dUxv1Ap p|f5w"QcH DLL中的钩子函数如下:
)=]u]7p} -cL{9r&X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&}q;," {
6*uWRjt BOOL bProcessed=FALSE;
e"@Ag:r@a if(HC_ACTION==nCode)
A0f98?j^ {
) ]
C"r_ if((lParam&0xc0000000)==0xc0000000){// 有键松开
Qf:#{~/ switch(wParam)
zlhHSy K {
nQ5N\RAZ case VK_MENU:
z 7
s&7)a MaskBits&=~ALTBIT;
J%mtlA break;
C1ZuDL)e case VK_CONTROL:
r]<?,xx[ MaskBits&=~CTRLBIT;
)' 3V4Z& break;
% r>v^1Vo case VK_SHIFT:
"k'P
#v{f MaskBits&=~SHIFTBIT;
lc8zF5 break;
8EBy5X}US default: //judge the key and send message
OoqA`%
break;
u>y/<9]q8 }
1> IA9]D7 for(int index=0;index<MAX_KEY;index++){
z3mo2e if(hCallWnd[index]==NULL)
S+*g continue;
ZKp9k6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
T5gL {
EjDr
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
c*c 8S~6 bProcessed=TRUE;
G%#M17 }
.2v)x }
VTIRkC
wl@ }
IL&;2% else if((lParam&0xc000ffff)==1){ //有键按下
Bl1^\[# switch(wParam)
La9:qpj {
W0qn$H case VK_MENU:
>5c38D7k) MaskBits|=ALTBIT;
jM'(Qa
break;
C=zc6C, case VK_CONTROL:
XRx^4]c MaskBits|=CTRLBIT;
Yj'/
p break;
hvo7T@*' case VK_SHIFT:
u`~,`z^{n MaskBits|=SHIFTBIT;
r0L'
mf$ break;
H2oD0f| default: //judge the key and send message
xwjiNJ Gj break;
2[QyH'"^E }
W6Z3UJ- for(int index=0;index<MAX_KEY;index++){
;cD&qheDV if(hCallWnd[index]==NULL)
..a@9#D continue;
/4wPMAlb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
CjT]!D)s {
3^-yw` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
RJa1pYK bProcessed=TRUE;
qw35LyL }
tuIQiWHbM }
"IuPg=|# }
%Xjg/5G - if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+txHj(Y` for(int index=0;index<MAX_KEY;index++){
U%u%_{- if(hCallWnd[index]==NULL)
Fsi;[be$A continue;
D wtvtglqV if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
q2}6lf,J
K SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
[Zj6v a //lParam的意义可看MSDN中WM_KEYDOWN部分
^nGKuW7\ }
Z.E@aml\
}
=?oYEO7 }
3`U^sr:[% return CallNextHookEx( hHook, nCode, wParam, lParam );
}]!?t~5* }
:vo#( kB3@;z: 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:
O&@pi-=o ay`A Gr BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.0b4"0~T6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?
e<D + rcU*6`IWA 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:
''3b[< dk[MT'DV LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
aYrbB# {
6)j/"9oY if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
qfS
]vc_N {
*)xjMTJ% //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
dQ`=CIr SaveBmp();
O;H|nW} return FALSE;
m>&:)K}m }
* G0I2 …… //其它处理及默认处理
$-p#4^dg }
kpLx?zW--q kDWMget$ 3#Qek2 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。
J[{?Y'RUM rGUu K0L& 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。
pZV=Co3!I MYMg/>f[ 二、编程步骤
:=e"D;5 ZMGthI}~- 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";
sMNhD/bb G-Dc(QhU& 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
b 67l\L cu )w6!f 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;
wq
=Ef V8}jFib 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;
{2=f,,|+f i&Xjbcbp 5、 添加代码,编译运行程序。
n1PV/ Z AEE&{_[S 三、程序代码
}zyh! L yNLz
m5 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
7x//4G #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
$ )orXe| #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
)Nnrsa #if _MSC_VER > 1000
xjH({(/B>a #pragma once
H-/w8_} KG #endif // _MSC_VER > 1000
[I2vg<my #ifndef __AFXWIN_H__
YLehY #error include 'stdafx.h' before including this file for PCH
T))F
r: #endif
2P2/]-6s#r #include "resource.h" // main symbols
"fOxS\er class CHookApp : public CWinApp
m
^'! {
B*&HQW *u public:
ihBIE CHookApp();
Cd'`rs}3 // Overrides
,}a'h4C // ClassWizard generated virtual function overrides
&b9bb{y_$K //{{AFX_VIRTUAL(CHookApp)
x't@Mc public:
?AYb@&% virtual BOOL InitInstance();
B'8T+qvA virtual int ExitInstance();
91\]Dg //}}AFX_VIRTUAL
Bhg,P.7 //{{AFX_MSG(CHookApp)
'h3yxf}\ // NOTE - the ClassWizard will add and remove member functions here.
?~=5x // DO NOT EDIT what you see in these blocks of generated code !
HC(7,3 //}}AFX_MSG
<Wa7$ h F DECLARE_MESSAGE_MAP()
\Y^GA;AMQQ };
"a=dx|
Z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
6S&OE k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
DW>|'w % BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
=cWg39$(I BOOL InitHotkey();
E@CK.-N| BOOL UnInit();
EPd
#endif
0;Z] vl/| `L7Cf&W\l8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
|{9&!=/qf #include "stdafx.h"
}II)<g' #include "hook.h"
SmCtwcB1 #include <windowsx.h>
gtRVXgI #ifdef _DEBUG
sM6o(=> #define new DEBUG_NEW
,u^%[ejH #undef THIS_FILE
@r3,|tkrz static char THIS_FILE[] = __FILE__;
!eA6Ejf #endif
?L+|b5RS #define MAX_KEY 100
<m0m8p"G #define CTRLBIT 0x04
$8WeWmY #define ALTBIT 0x02
Rg%Xy`gS #define SHIFTBIT 0x01
3S{3AmKj? #pragma data_seg("shareddata")
^Fg!.X_ HHOOK hHook =NULL;
oz&RNB.K UINT nHookCount =0;
4b
1a? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"9O8#i<Nr static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
>gf,8flgj static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
P0ZY;/e5h static int KeyCount =0;
DSL3+%KF# static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Xz\ X 8I #pragma data_seg()
Rv Uw,= HINSTANCE hins;
Wp(Rw4j void VerifyWindow();
gPcOm
b BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
gVI T6"/ //{{AFX_MSG_MAP(CHookApp)
^a?g~G // NOTE - the ClassWizard will add and remove mapping macros here.
X]c>clk, // DO NOT EDIT what you see in these blocks of generated code!
X6so)1jJ //}}AFX_MSG_MAP
r:--DKt END_MESSAGE_MAP()
Q9{f'B .tA=5QY, CHookApp::CHookApp()
NKMVp/66D {
L!0}&i;u~5 // TODO: add construction code here,
r;@"s g // Place all significant initialization in InitInstance
FE3uNfQs| }
EpB3s{B" DA^!aJ6iF CHookApp theApp;
:Ny^-4-N LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
UY^TTRrH {
Svt%*j BOOL bProcessed=FALSE;
{Lugdf' if(HC_ACTION==nCode)
?eDZ-u9) {
&EJ/Rl if((lParam&0xc0000000)==0xc0000000){// Key up
79Ur1-]/ switch(wParam)
vf?Xt {
GsU.Lkf case VK_MENU:
bwe)_<c MaskBits&=~ALTBIT;
9v?rNJs break;
}#phNn6 case VK_CONTROL:
R#4f_9e<Z MaskBits&=~CTRLBIT;
Mw|lEctN0 break;
hp$1c case VK_SHIFT:
p
Cgm!t?/ MaskBits&=~SHIFTBIT;
0y3C
/>a break;
g5lK&-yu] default: //judge the key and send message
2)9XTY6$ break;
GC7W7B }
yi*EE% for(int index=0;index<MAX_KEY;index++){
hCob^o if(hCallWnd[index]==NULL)
g"v6UZ\ continue;
_*-b0 }T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+zZ]Txb( {
5#mHWBGd7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&Y1RPO41J bProcessed=TRUE;
z-^/<u1p }
ta0 ;:o?/d }
qJ[wVNHh! }
`.3{ else if((lParam&0xc000ffff)==1){ //Key down
;E0x#JUrw switch(wParam)
:
`,#z?Rk {
: eFyd`Syw case VK_MENU:
~~}8D" MaskBits|=ALTBIT;
]T._TZ" break;
&neB$m3y case VK_CONTROL:
{m/KD 'b_ MaskBits|=CTRLBIT;
ce7$#
# f break;
Q}|0 case VK_SHIFT:
<jqL4!< MaskBits|=SHIFTBIT;
11RqP:zg break;
L'O=;C"f default: //judge the key and send message
eN0lJ ~ break;
?;GXFKy }
\-D[C+1( for(int index=0;index<MAX_KEY;index++)
jJAr #| {
CEJqo8ds if(hCallWnd[index]==NULL)
>=/DCQ$ continue;
0Ok[`r` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2]V8- {
o.wXaS8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
z`sW5K(A bProcessed=TRUE;
I].ddR% }
7>f)pfLM }
~^>g<YR[ }
(dP9`Na] if(!bProcessed){
2XyC;RWJ% for(int index=0;index<MAX_KEY;index++){
DI[ if(hCallWnd[index]==NULL)
!eP0b~$/^J continue;
HpS1(%d" if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
,15$$3z /E SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
zS'{F>w }
! q+>'Mt }
]CX^!n }
-qG7, t return CallNextHookEx( hHook, nCode, wParam, lParam );
1;HL=F }
2 ]}e4@{ mh35S!I3I^ BOOL InitHotkey()
/w2NO9Q {
F41g Mg if(hHook!=NULL){
4%7Oaf>9 nHookCount++;
8#IEE|1 return TRUE;
m5l& }
3v3`d+;& else
S2?)Sb` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
0aGAF ] if(hHook!=NULL)
eBqF@'DQ nHookCount++;
3935cxT1U return (hHook!=NULL);
aT8A+=K6 }
H>wXQ5 ?W; BOOL UnInit()
D0yH2[j+ {
T#a6X;9P if(nHookCount>1){
S"/gZfxer nHookCount--;
:Yn{:%p return TRUE;
\wV ?QH }
VM+l9z> BOOL unhooked = UnhookWindowsHookEx(hHook);
}]. |7h if(unhooked==TRUE){
0G3T.4I nHookCount=0;
EGjzjuJu{ hHook=NULL;
AjINO}b }
A+VzpJ~ return unhooked;
R^rA.7T }
J7k=5Fqej; Vu,:rPqI BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:AyZe7:(D {
<Ys7`e6eY BOOL bAdded=FALSE;
cq9d;~q for(int index=0;index<MAX_KEY;index++){
|UN#utw{^Y if(hCallWnd[index]==0){
A/.z. K hCallWnd[index]=hWnd;
>Sm#-4B- HotKey[index]=cKey;
Ca0t}`<S HotKeyMask[index]=cMask;
i8.OM*[f bAdded=TRUE;
RY*yj&?w[ KeyCount++;
e r"gPW break;
`3.bux~ }
C3b<Wa]) }
29NP!W
/g return bAdded;
Hr/J6kyB) }
Z$S0X$q} B|S X?X BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E#n:d9WA: {
f0g&=k{OD BOOL bRemoved=FALSE;
\8`^QgV`@ for(int index=0;index<MAX_KEY;index++){
kp*BAQ if(hCallWnd[index]==hWnd){
H}lbF0` if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#Q%0y^s hCallWnd[index]=NULL;
~AR0 ,lak HotKey[index]=0;
Q#Xa]A- HotKeyMask[index]=0;
94.M8 bRemoved=TRUE;
z_a7HCG2 KeyCount--;
?{>5IjL)en break;
EiWd =jDm }
%j ?7O00@ }
>c.HH}O0W }
l6!a?C[2T return bRemoved;
r`C t/]c }
XNkQ0o0 O9Yk5b; void VerifyWindow()
L'a>D {
{>l`P{{y for(int i=0;i<MAX_KEY;i++){
K_V$ ktL if(hCallWnd
!=NULL){ yJw4!A 1!
if(!IsWindow(hCallWnd)){ /(bn+l}W
hCallWnd=NULL; qGie~S ##
HotKey=0; }j,G)\g#
HotKeyMask=0; n7d`J_%s
KeyCount--; yj9Ad*.
} +ID%( :
} kYkck]|
} u!cA_,
} T\L
LOx\
e{d$OzT) V
BOOL CHookApp::InitInstance() (rSBzM]H
{ ni3A+Y0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); @m"P_1`*
hins=AfxGetInstanceHandle(); r5&?-G
InitHotkey();
="]y^&(L(
return CWinApp::InitInstance(); 9R4q^tGR\
}
5<?/M<i
5v#_2Ih
int CHookApp::ExitInstance() {4b8s%:!4
{ <nn!9V\C
VerifyWindow(); RQ[6svfP
UnInit(); e6^iakSd.L
return CWinApp::ExitInstance(); uB35CRd
} i%9xt1c_
/f
-\
3
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H/O v8|
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <(caY37o6)
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #:/-8Z(0
#if _MSC_VER > 1000 Xr pnc7
#pragma once ,U'E!?=:VS
#endif // _MSC_VER > 1000 x<{)xP+|
`d:cq.OO
class CCaptureDlg : public CDialog 3/2G~$C
{ r$-]NYPi
// Construction vm "dE4W=
public: :@+@vM;gh
BOOL bTray; xr-v"-
BOOL bRegistered; cGe-|>:
BOOL RegisterHotkey(); y&+Sp/6BYA
UCHAR cKey; AN-;*n<'
UCHAR cMask; @0q*50
void DeleteIcon(); {siIRl2&
void AddIcon(); Hf$LWPL)lM
UINT nCount; 9~WjCa*,&
void SaveBmp(); }K\m.+%=d
CCaptureDlg(CWnd* pParent = NULL); // standard constructor P[C03a!lXg
// Dialog Data qW:\6aEG
//{{AFX_DATA(CCaptureDlg) d512Y[ R
enum { IDD = IDD_CAPTURE_DIALOG }; *Ldno`1O
CComboBox m_Key; C\p _
BOOL m_bControl; :HG5{zP
BOOL m_bAlt; &c1zEgl
BOOL m_bShift; ?AJE*=b
CString m_Path; %QrpFE5V5
CString m_Number; "#a,R^J
//}}AFX_DATA iu6NIy7D
// ClassWizard generated virtual function overrides S?Z"){
//{{AFX_VIRTUAL(CCaptureDlg) ?_7^MP>
public: itW~2#nJz
virtual BOOL PreTranslateMessage(MSG* pMsg); " )_-L8
protected: VVyms7
VN
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ThSB\
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); " tUF,G(<
//}}AFX_VIRTUAL DQOEntw
// Implementation x4vowF
protected: H '(Ky
HICON m_hIcon; !*l5%H
// Generated message map functions \zPcnDB
//{{AFX_MSG(CCaptureDlg) BTu_$5F
virtual BOOL OnInitDialog(); 3fWL}]{<a
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )mw&e}jRV
afx_msg void OnPaint(); c$HZvv
afx_msg HCURSOR OnQueryDragIcon(); Y^@Nvt$<K
virtual void OnCancel(); coQ>CbHg
afx_msg void OnAbout(); D27MT/=7
afx_msg void OnBrowse(); i5 F9*
afx_msg void OnChange(); ,HE +|y#
//}}AFX_MSG Fb{kql=
DECLARE_MESSAGE_MAP() #ig* !
};
<c&6M
#endif @(mXiK
{g(-C&
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file k)l^;x-
#include "stdafx.h" 0'9zXJ"
#include "Capture.h" uY6|LTK&x
#include "CaptureDlg.h" cc^ [u+
#include <windowsx.h> !:^lTvYWZH
#pragma comment(lib,"hook.lib") \.%GgTF
#ifdef _DEBUG }}'0r2S
#define new DEBUG_NEW ()>,L?y
#undef THIS_FILE .\X;VWTI
static char THIS_FILE[] = __FILE__; 4/tp-dBip
#endif M@/Hd0$
#define IDM_SHELL WM_USER+1 `Mxi2Y{vp
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q{0!N8']"
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |Vs?yW
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (wRJ"Nwu
class CAboutDlg : public CDialog S EeDq/h
{ D!oELZ3
public: +$F_7Hx
CAboutDlg(); DVWqrK}q
// Dialog Data (haYY]W\
//{{AFX_DATA(CAboutDlg) ?Gq|OT8
enum { IDD = IDD_ABOUTBOX }; ?{O >&<~
//}}AFX_DATA @N-P[.qL"
// ClassWizard generated virtual function overrides ^<}eONa
//{{AFX_VIRTUAL(CAboutDlg)
/M1 /
protected: Iw<:
k
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dk^Uf84.Gr
//}}AFX_VIRTUAL kCu" G
// Implementation ~X`_g/5X
protected: W_E0+
//{{AFX_MSG(CAboutDlg)
{|kEGq~aE
//}}AFX_MSG o=1M<dL
DECLARE_MESSAGE_MAP() 6?3f+=e"~!
}; =V@5W[bV
~j`;$o
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7jZ=+2
{ zNs8yMnFr
//{{AFX_DATA_INIT(CAboutDlg) s]"NqwIPK
//}}AFX_DATA_INIT -Pr1r
} wewYlm5@
VNmQ'EuV}2
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5IPZ;
{ !Cpy
)D(
CDialog::DoDataExchange(pDX); x@ZxV*T^
//{{AFX_DATA_MAP(CAboutDlg) 9f
^c9@=
//}}AFX_DATA_MAP x dT1jI
} >2[\WF*"X
1$*ZN4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "0(H! }D
//{{AFX_MSG_MAP(CAboutDlg)
6tPgFa#N
// No message handlers XPhC*r
//}}AFX_MSG_MAP )r)3.|wJm
END_MESSAGE_MAP() H40~i=.
7( &\)qf=n
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !`rR;5&sT
: CDialog(CCaptureDlg::IDD, pParent) 1FCHqqZ=
{ /7nircXj@
//{{AFX_DATA_INIT(CCaptureDlg) \=O[' #
m_bControl = FALSE; Y'YvVI
m_bAlt = FALSE; DRn]>IFU
m_bShift = FALSE; 3:XF7T
m_Path = _T("c:\\"); 7ktSj}7W]
m_Number = _T("0 picture captured."); JYt)4mOo
nCount=0; Vg6/ 1I
bRegistered=FALSE; K|q5s]4I
bTray=FALSE; <Oi65O_X
//}}AFX_DATA_INIT %q~YJ*\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e-Xr^@M*Q
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7Z#r9Vr
} 3q!hY
xIN&>D'|N
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vnNX)$f
{ ,co~@a@9
CDialog::DoDataExchange(pDX); &X^ -|7~N
//{{AFX_DATA_MAP(CCaptureDlg) /YP,Wfd%
DDX_Control(pDX, IDC_KEY, m_Key); BP& T|s
DDX_Check(pDX, IDC_CONTROL, m_bControl); ]5V=kNui
DDX_Check(pDX, IDC_ALT, m_bAlt); h& t/
L
DDX_Check(pDX, IDC_SHIFT, m_bShift); o1m+4.-
DDX_Text(pDX, IDC_PATH, m_Path); 5cv&`h8uo_
DDX_Text(pDX, IDC_NUMBER, m_Number); 6%hr]>L
//}}AFX_DATA_MAP 7wivu*0
} Md4hd#z
HinPO
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mzh8<w?ns
//{{AFX_MSG_MAP(CCaptureDlg) m~[4eH,
ON_WM_SYSCOMMAND() i;u#<y{E
ON_WM_PAINT() *Vbf;=Mb
ON_WM_QUERYDRAGICON() Y+,ii$Ce~
ON_BN_CLICKED(ID_ABOUT, OnAbout) cN#c25S>
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 59Lv/Mfy
ON_BN_CLICKED(ID_CHANGE, OnChange) Dsl,(qm5
//}}AFX_MSG_MAP @B@`V F
END_MESSAGE_MAP() "Cj{Z@n
&tNnW
BOOL CCaptureDlg::OnInitDialog() lo1<t<w`
{ %j.B/U$
CDialog::OnInitDialog(); !CBvFl/v
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H2ZRUFu
ASSERT(IDM_ABOUTBOX < 0xF000); kM0TQX)$m
CMenu* pSysMenu = GetSystemMenu(FALSE); +b =X~>vZ
if (pSysMenu != NULL) {Dc{e5K
{ Io|3zE*<
CString strAboutMenu; m| /?((s
strAboutMenu.LoadString(IDS_ABOUTBOX); :>:F6Db"U
if (!strAboutMenu.IsEmpty()) FZt a
{ d@$]/=%
pSysMenu->AppendMenu(MF_SEPARATOR); /IO<TF(X
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {
]*#WU
} :i?7RouO
} x1@`\r#0
SetIcon(m_hIcon, TRUE); // Set big icon u8w4e!rKo6
SetIcon(m_hIcon, FALSE); // Set small icon $s2Y,0>I6
m_Key.SetCurSel(0); UABaS(f3
RegisterHotkey(); LpQ=Y]{j
CMenu* pMenu=GetSystemMenu(FALSE); o*fNY
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); AHo4%
5
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?M}W;Z
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); c'wxCqnE
return TRUE; // return TRUE unless you set the focus to a control Y<]A5cm
} w$aiVOjgT
8 h.Dc&V
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^$N}[1
{ U,tl)(!@Q-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) W
Ai91K@
{ d)R7#HLZ7
CAboutDlg dlgAbout; ezq<)gJc
dlgAbout.DoModal(); /8Sr(
} G1=/G
else ul-A'
{ |7pi9
CDialog::OnSysCommand(nID, lParam); w1Xe9'$Qb
} wNfWHaH" m
} + a,x
}akF=/M
void CCaptureDlg::OnPaint() R0WI s:k2
{ R4#56#d<
if (IsIconic()) F>H5 ww9E
{ 9'My/A0
CPaintDC dc(this); // device context for painting g'%^-S ]
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3axbWf3[
// Center icon in client rectangle *_ U=KpZF
int cxIcon = GetSystemMetrics(SM_CXICON); R7
WGc[
int cyIcon = GetSystemMetrics(SM_CYICON); r(VGdG
CRect rect; Ft[)m#Dj`
GetClientRect(&rect); l0v]+>1i:
int x = (rect.Width() - cxIcon + 1) / 2; Ag82tDL[u
int y = (rect.Height() - cyIcon + 1) / 2; fF|m~#y
// Draw the icon gG,"wzj
dc.DrawIcon(x, y, m_hIcon); ndXUR4
} RT~6 #Caf
else MYlPG1X=?
{ ta*6xpz-\Q
CDialog::OnPaint(); 3d>3f3D8;
} e8Y;~OAj[
} <hv {,1p-r
aANzL
HCURSOR CCaptureDlg::OnQueryDragIcon() Y)ig:m]#
{ ~Pm[Ud
return (HCURSOR) m_hIcon; KE_GC ;bQ
} Lj,!025
|4_[wX
r
void CCaptureDlg::OnCancel() h{Zd, 9H
{ gK6_vS4K)
if(bTray) m%p;>:"R
DeleteIcon(); pR,eus;8
CDialog::OnCancel(); ar%!h~
} 2," (
p%]ZG,
void CCaptureDlg::OnAbout() Jg2*$gL;_
{ m~<<ok_
CAboutDlg dlg; (nUSgZz5
dlg.DoModal(); =iFI@2
} 8wX|hK!Gz
(%\tE
void CCaptureDlg::OnBrowse() RHIGNzSz
{ BMJsR0
CString str; ~snYf7
BROWSEINFO bi; OngUZMgdb
char name[MAX_PATH]; ^rX5C2}G\D
ZeroMemory(&bi,sizeof(BROWSEINFO)); }TDoQ]P
bi.hwndOwner=GetSafeHwnd(); B']}n`g
bi.pszDisplayName=name; q(nPI
bi.lpszTitle="Select folder"; 0+m4
}]6l
bi.ulFlags=BIF_RETURNONLYFSDIRS; <W2YG6^i
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]T<\d-!CZN
if(idl==NULL) t91z<Y|
return; 5_yu4{@;y
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z<4Du
str.ReleaseBuffer(); #FwTV@
m_Path=str; h)o5j-M>4
if(str.GetAt(str.GetLength()-1)!='\\') G,,7.%eib=
m_Path+="\\"; a?NoNv)&
UpdateData(FALSE); FDQP|,
} vkK8D#K
-NL=^O$G
void CCaptureDlg::SaveBmp() ^dP]3D1
@
{ 0/~20 KD{s
CDC dc; G>?'b
dc.CreateDC("DISPLAY",NULL,NULL,NULL); p8bAz
CBitmap bm; rWS],q=c
int Width=GetSystemMetrics(SM_CXSCREEN); '1NZSiv+C?
int Height=GetSystemMetrics(SM_CYSCREEN); _2Hehw
bm.CreateCompatibleBitmap(&dc,Width,Height); R GC DC*\
CDC tdc; BqG7Et
tdc.CreateCompatibleDC(&dc); #P/}'rdt
CBitmap*pOld=tdc.SelectObject(&bm); #_9Jam%M
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %;-r->
tdc.SelectObject(pOld); j@778fvM\t
BITMAP btm; i^_?C5
bm.GetBitmap(&btm); zLS=>iLD{
DWORD size=btm.bmWidthBytes*btm.bmHeight; t}m"rMbt
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JXKo zy41
BITMAPINFOHEADER bih; J=7<dEm&
bih.biBitCount=btm.bmBitsPixel; C[2LP$6*/
bih.biClrImportant=0; 96P3B}Dk
bih.biClrUsed=0; }:9UI
bih.biCompression=0; 3+tr_psH
bih.biHeight=btm.bmHeight; <v+M ~"%V
bih.biPlanes=1; &br_opNi
bih.biSize=sizeof(BITMAPINFOHEADER); *R8qnvE\()
bih.biSizeImage=size; N3SB-E+
bih.biWidth=btm.bmWidth; <cNg_ZZ;8
bih.biXPelsPerMeter=0; ?I}0[+)V
bih.biYPelsPerMeter=0; iD`>Bt7gD
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ZB5u\NpcW
static int filecount=0; P d)<Iw^<
CString name; F?.J1]
name.Format("pict%04d.bmp",filecount++); q%\rj?U_
name=m_Path+name; ?CHFy2%Y
BITMAPFILEHEADER bfh; J]mq|vE
bfh.bfReserved1=bfh.bfReserved2=0; @$]
CC1Y
bfh.bfType=((WORD)('M'<< 8)|'B'); <rAWu\d;
bfh.bfSize=54+size; vgbk
{
bfh.bfOffBits=54; i48Tb7Rx~n
CFile bf; le.(KgRS4
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ jSMs<ox
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y
jQpdO
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0$e]?]X6
bf.WriteHuge(lpData,size); r5(-c]E7
bf.Close(); gW_^GrK pI
nCount++; dd|/I1
} p&<X&D
GlobalFreePtr(lpData); XJ9bY\>)q1
if(nCount==1) 8"2X 8C8
m_Number.Format("%d picture captured.",nCount); /m+q!yi &
else dt=5 Pnf[y
m_Number.Format("%d pictures captured.",nCount); Lf} @v
UpdateData(FALSE); F G5e{
} *3r{s'm
^"hsbk&Yu
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) c N^,-~U
{ {8as _
if(pMsg -> message == WM_KEYDOWN) ' *x?8-K P
{ }iF"&b0n"
if(pMsg -> wParam == VK_ESCAPE) l:
X]$2;
return TRUE; n^m6m%J)
if(pMsg -> wParam == VK_RETURN) BoMf#l.3B
return TRUE; I_/kJ#7vj
} kH10z~(e
return CDialog::PreTranslateMessage(pMsg); )s';m$
} I%q&4L7pj
E%E3h1Ua
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V3]"ROH
{ "0yO~;a
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |K%nVcR=
SaveBmp(); <O#/-r>2
return FALSE; L8zY?v(bG
} _a3,Zuv
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DMY?'Nts!
CMenu pop; {Noa4i
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); SmJ6Fm6
CMenu*pMenu=pop.GetSubMenu(0); ou[_ y
pMenu->SetDefaultItem(ID_EXITICON); X(;,-7Jw
CPoint pt; '[h|f
GetCursorPos(&pt); 'nFqq:2Xa
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~+GMn[h
if(id==ID_EXITICON) XdDy0e4{%<
DeleteIcon(); }FTyRHD|
else if(id==ID_EXIT) 3Hli^9&OX_
OnCancel(); e Ert_@}
return FALSE;
5r:SBt|/
} uW8LG\Z>D5
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N:y3tpG
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4oF8F)ASj
AddIcon(); ]B<Hrnn
return res; s C9j73vf
}
JRm:hf'
[kyF |3k~
void CCaptureDlg::AddIcon() ^/3R/;?
{ f@R j;R~Jp
NOTIFYICONDATA data; !6pOY*> j
data.cbSize=sizeof(NOTIFYICONDATA); 5Z 7 <X2
CString tip; pv=g)
tip.LoadString(IDS_ICONTIP); =-`}(b2N
data.hIcon=GetIcon(0); n0T\dc~
data.hWnd=GetSafeHwnd(); O6^>L0'
strcpy(data.szTip,tip); O/9 dPod
data.uCallbackMessage=IDM_SHELL; K.Tfu"6
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m"~^-mJ-
data.uID=98; 0@yHT-Dy
Shell_NotifyIcon(NIM_ADD,&data); 99@uU[&IJ
ShowWindow(SW_HIDE); ,OX(z=i_
bTray=TRUE; ;~$_A4;
} a{7>7%[
}jM&GH1
void CCaptureDlg::DeleteIcon() {q%wr*
{ :h
tOz.
NOTIFYICONDATA data; }@Ij}Ab>
data.cbSize=sizeof(NOTIFYICONDATA); 1 f ]04TI
data.hWnd=GetSafeHwnd(); Cg/L/0Ak
data.uID=98; 3[E3]]OVa
Shell_NotifyIcon(NIM_DELETE,&data); Vf#X[$pc/
ShowWindow(SW_SHOW); :=BFx"Y
SetForegroundWindow(); ,BCtNt(
ShowWindow(SW_SHOWNORMAL); ')w:`8Tl
bTray=FALSE; hBf0kl
} {(@M0?
EX%KfWDr
void CCaptureDlg::OnChange() Kv'2^B
{ 66*/"dBwm
RegisterHotkey(); wK+%[i&,
} :b[
[}'
Amf
gc>eJ
BOOL CCaptureDlg::RegisterHotkey() ?(el6 J}
{ 5w)tsGX\
UpdateData(); =B g
UCHAR mask=0; <(dHh9$~
UCHAR key=0; cXiNO
ke&
if(m_bControl) /s"mqBXCG
mask|=4; v/{LC4BF
if(m_bAlt) v1Tla]d
mask|=2; yrOWC
if(m_bShift) }{Ab:+aNd
mask|=1; ES[H^}|Gi
key=Key_Table[m_Key.GetCurSel()]; ;uj&j1
if(bRegistered){ cRPW
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~Rd,jfx
bRegistered=FALSE; F+mn d,3
} wQ
/IT}-
cMask=mask; P` Hxj> {
cKey=key; 8yEN)RqI
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); hh/C{ l
return bRegistered; :ulOG{z
} h/E+r:2]
We&~]-b AW
四、小结 u;f${Wn'3
JDcc`&`M
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。