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:
8,&QY%8pX
R>`TV(W`9 一、实现方法
"z ;ky8 "?Xb$V7 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:
yI}_
U +L<x0-& #pragma data_seg("shareddata")
u[1'Ap HHOOK hHook =NULL; //钩子句柄
FLOSdMYdw UINT nHookCount =0; //挂接的程序数目
-hpMd/F static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
T\$r| static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
atjrn:X static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
)\0LxsZ static int KeyCount =0;
tU(vt0~b static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
"(SZ;y #pragma data_seg()
|>AHc_:$$ 3']=w@~ O[ 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。
xouy|Nn' <LOas$
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:
9/R<, ]iVoF N}^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Rac4a@hZ cKey,UCHAR cMask)
#
>L^W7^ {
*heX[D
&>) BOOL bAdded=FALSE;
wUbLw for(int index=0;index<MAX_KEY;index++){
D}:M0EBS if(hCallWnd[index]==0){
nV+]jQ~o hCallWnd[index]=hWnd;
dnUiNs8 HotKey[index]=cKey;
d(j|8/tpA HotKeyMask[index]=cMask;
:ODG]-QF bAdded=TRUE;
{w|KWGk2 KeyCount++;
B3iU# break;
9W@Tf }
Fwv(J_'q }
dEM=U; return bAdded;
iWu^m+"k }
+b6kU{ //删除热键
'9#h^. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5$p7y: {
NHq*&xy BOOL bRemoved=FALSE;
5qx$=6PT for(int index=0;index<MAX_KEY;index++){
[}!obbM if(hCallWnd[index]==hWnd){
m;"dLUb if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
f1UGDC<p9 hCallWnd[index]=NULL;
E0Jk=cq HotKey[index]=0;
.f]2%utHB HotKeyMask[index]=0;
yu]nK-Y7S bRemoved=TRUE;
[X|KXlNfm KeyCount--;
!^<%RT9@| break;
p(]o#$ 6[ }
aw8q}: }
;NeN2 |I] }
74q|FQ return bRemoved;
$mp'/] }
Ik74%x7G` b(.,Ex] orzy&4 DLL中的钩子函数如下:
o{wXq)b Mee+bp LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|=9=a@l]P {
^%r>f@h!L BOOL bProcessed=FALSE;
=jN9PzLk if(HC_ACTION==nCode)
WGrG#Kw[ {
z^r if((lParam&0xc0000000)==0xc0000000){// 有键松开
~}fQ.F*7R switch(wParam)
q-)Ynp4' {
c-{;P>L case VK_MENU:
N3}jLl/ MaskBits&=~ALTBIT;
P_f^gB7 break;
| &]04 case VK_CONTROL:
my^2}>wi MaskBits&=~CTRLBIT;
5U+a{oA break;
B&oP0 jS case VK_SHIFT:
d;9F2,k$w MaskBits&=~SHIFTBIT;
E\!<= break;
T=n)ea A default: //judge the key and send message
nd/.]" break;
dNMz(~A[Y }
Y"&1jud4xl for(int index=0;index<MAX_KEY;index++){
t*'U|K4L/ if(hCallWnd[index]==NULL)
*(sUz?t continue;
}yW*vy6` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b4HUgW3Ac {
$-:j'e:j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6$|!_94>*) bProcessed=TRUE;
%+,7=Wt- }
J(JqusQd ! }
^7
oX Ju= }
&0*=F%Fd else if((lParam&0xc000ffff)==1){ //有键按下
+`)4jx)r/ switch(wParam)
)mVpJYt; {
eQvdi|6 case VK_MENU:
$yA2c^QS MaskBits|=ALTBIT;
!?~>f>js_l break;
] oh.w case VK_CONTROL:
xfyUT^ MaskBits|=CTRLBIT;
?QXc,*=N break;
O~WT$ case VK_SHIFT:
;=[~2*8 MaskBits|=SHIFTBIT;
m|5yET break;
bez_|fY{T default: //judge the key and send message
_(Qec?[^Ps break;
fq2t^c|$ }
f\~OG#AaX for(int index=0;index<MAX_KEY;index++){
ZdP2}w if(hCallWnd[index]==NULL)
-Ob89Z?2A continue;
h7h[!> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yj48GQP] {
)ZA3m_w] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>(aGk{e1 bProcessed=TRUE;
jg_##Oha }
Kq*D_Rh2 }
,ruL7|T& }
Bco_\cpt]z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&>.
w* for(int index=0;index<MAX_KEY;index++){
(IY=x{b if(hCallWnd[index]==NULL)
gADEjr*H continue;
R} #6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
DWQ@]\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>pV|c\ //lParam的意义可看MSDN中WM_KEYDOWN部分
`zJTVi4 }
>sL"HyY#H }
`V1D&}H+G }
'kz[Gh*8 return CallNextHookEx( hHook, nCode, wParam, lParam );
Xt!%W }
Ew|VDD(. @+3@Z?!SZ 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:
i"{ \ > x3JX}yCX BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
X~ AE?? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
A$9^JF0$ c8'!>#$ 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:
)OAd[u< M@n9i@UsO LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
9ntXLWK7e {
3 oG5E"G if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
-R[ *S " {
(\QkXrK //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
}BpCa6SAs SaveBmp();
V*m@Rs!)2 return FALSE;
UoLvc~n7 }
IfH*saN7 …… //其它处理及默认处理
)4hb% U }
[a&|c%h Kug_0+gI @@,l0/ 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。
J8T?=%?= eN/o}<(e 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。
k|^e=I
m{/?6h 1 二、编程步骤
5,0fL
vj+x( 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";
z4snH%q V'";u?h#S 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
|g3a1El F0O/SI(cA 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;
a|*{BlY ov{ 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;
uIG,2u, rI\G&OqpP 5、 添加代码,编译运行程序。
6d RxfbL F9sVMV 三、程序代码
h|_E>6d) R).?lnS ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Jv*(DFt!v #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
?]`kc #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
!);kjXQS? #if _MSC_VER > 1000
]vJ]
i<|b #pragma once
J!$q"0G'WT #endif // _MSC_VER > 1000
,~@Nhd~k #ifndef __AFXWIN_H__
?F@0"qi #error include 'stdafx.h' before including this file for PCH
hcvWf\4'#q #endif
>i> %@ #include "resource.h" // main symbols
rpk
)i:k\ class CHookApp : public CWinApp
\;z*j|;B {
_] ~ gp. public:
NArql CHookApp();
%"2;i@ // Overrides
IpX>G]"-C // ClassWizard generated virtual function overrides
^6*2a(S& //{{AFX_VIRTUAL(CHookApp)
d66
GO];" public:
73kF=*m virtual BOOL InitInstance();
<p<J;@ virtual int ExitInstance();
|fx*F}1 //}}AFX_VIRTUAL
'n7)()"2 //{{AFX_MSG(CHookApp)
)Q_^f'4 // NOTE - the ClassWizard will add and remove member functions here.
hJavi>374 // DO NOT EDIT what you see in these blocks of generated code !
< sJ //}}AFX_MSG
(p2jigP7a[ DECLARE_MESSAGE_MAP()
XY[uyR4Z };
vI<n~FHt LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>a@c5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
9oly=&lJ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
<q
V<dK&W BOOL InitHotkey();
28KS*5S BOOL UnInit();
a=<l}`* #endif
Le&SN7I r sf +dC //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
]V,wIyC #include "stdafx.h"
Sga/i?! #include "hook.h"
nATEv2:G #include <windowsx.h>
Voi`OCut #ifdef _DEBUG
fdIO'L_ #define new DEBUG_NEW
> .L\ > #undef THIS_FILE
1 m)WM,L static char THIS_FILE[] = __FILE__;
JG%y_
Qy?K #endif
T}ZUw;}BL #define MAX_KEY 100
i1qhe?5 #define CTRLBIT 0x04
1}A1P&2> #define ALTBIT 0x02
Bn83W4M #define SHIFTBIT 0x01
sLGut7@Sg #pragma data_seg("shareddata")
#{]X<et HHOOK hHook =NULL;
@`&kn;7T UINT nHookCount =0;
Xsvf@/]U static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
B'( /W@ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
O7p>"Bh static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
p`@7hf|hm static int KeyCount =0;
c#?JW:^|Df static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
j'#Y$d1. #pragma data_seg()
LTGKs^i4 HINSTANCE hins;
K5O8G void VerifyWindow();
|Co ?uv
i BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
{5tb.{ //{{AFX_MSG_MAP(CHookApp)
7!0~sf9A // NOTE - the ClassWizard will add and remove mapping macros here.
}<y-`WB // DO NOT EDIT what you see in these blocks of generated code!
xXpeo_y' //}}AFX_MSG_MAP
yQA6w% END_MESSAGE_MAP()
|/u&%w?W
Byx8`Cx1 CHookApp::CHookApp()
Gj6(ycaS {
lkNaSz[ // TODO: add construction code here,
mM| 313 // Place all significant initialization in InitInstance
3snr-) }
D$W&6' 26yjQ CHookApp theApp;
x>5"7MR` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/&g5f4[|p {
*~~&*&+ BOOL bProcessed=FALSE;
2R:I23[#B if(HC_ACTION==nCode)
>
YHwWf- {
O s*B%,} if((lParam&0xc0000000)==0xc0000000){// Key up
h
rL_. 4 switch(wParam)
0_d,sC?V {
)/BI:) case VK_MENU:
`N8?F3> MaskBits&=~ALTBIT;
NwH`t#zd break;
s8,{8k case VK_CONTROL:
YGRv` `( MaskBits&=~CTRLBIT;
D^+#RR'#, break;
86bl'FdKS case VK_SHIFT:
s8,N9o[.~P MaskBits&=~SHIFTBIT;
[42vO break;
P`JO6O:& default: //judge the key and send message
kPt9(E] break;
yi7m!+D3 }
a2l\B ~n for(int index=0;index<MAX_KEY;index++){
g3r4>SA if(hCallWnd[index]==NULL)
~NYy@l continue;
bo]xah|."j if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
u)]]9G
_8 {
Z83A1`!.| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
RcQo1 bProcessed=TRUE;
!&f(Xs }
vYT%e:8)q }
Nqih LUv }
[yzDa:% else if((lParam&0xc000ffff)==1){ //Key down
m&EJ@,H switch(wParam)
';g]!XsY) {
PP\nR
@ case VK_MENU:
*\9JIi 2 MaskBits|=ALTBIT;
jfxW9][ break;
RQzcsO case VK_CONTROL:
6$"gm$3O] MaskBits|=CTRLBIT;
o)_;cCr)q break;
F$l]#G.@A case VK_SHIFT:
K!|%mI8gk MaskBits|=SHIFTBIT;
>Qk4AMIO break;
K8,fw-S% default: //judge the key and send message
eK%~`Y break;
9cJzL"yi }
]s3U +t? for(int index=0;index<MAX_KEY;index++)
u="VJ3 {
9EryHV| if(hCallWnd[index]==NULL)
eGZ{%\PH< continue;
a@[y)xa$Z
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
EAVB:gE {
O gQE1{C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Y9h~ hD bProcessed=TRUE;
#b[B$ }
EZ+_*_9 }
d,r%LjNI }
{-28% if(!bProcessed){
Q+d9D1b for(int index=0;index<MAX_KEY;index++){
c< ke)@ if(hCallWnd[index]==NULL)
`4Jlf! continue;
*],]E; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Jh3(5d"MV SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
o$k1&hyH }
&|t*9D }
9~8UG ( }
?S9!;x< return CallNextHookEx( hHook, nCode, wParam, lParam );
nl9G1Sm(E }
N7A/&~g5L SKx&t- BOOL InitHotkey()
B>dXyo {
CO25 if(hHook!=NULL){
Pb05>J3N nHookCount++;
fD8A+aA return TRUE;
"Dbjp5_ }
[C@0&[[ else
oM`[&m., hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-5 -X[`cF if(hHook!=NULL)
S`yY<1[O nHookCount++;
N
O|&nqq,> return (hHook!=NULL);
]YF[W`2h }
aBX^Wd BOOL UnInit()
Z-(V fp4 {
l`s_Id# if(nHookCount>1){
tOn_S@/r nHookCount--;
n !ty\E return TRUE;
L_Q1:nL-0 }
X|Gsf=
1S BOOL unhooked = UnhookWindowsHookEx(hHook);
AplXl= if(unhooked==TRUE){
vh8{*9+ nHookCount=0;
Eeemy*U hHook=NULL;
mz\d>0F U. }
_KSYt32N return unhooked;
Jj:4l~b,w }
&r\pQ}; VH3j BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
fL[(;KcAa {
n
GE3O#fv BOOL bAdded=FALSE;
8+5-7) for(int index=0;index<MAX_KEY;index++){
we6']iaV if(hCallWnd[index]==0){
b<UZDy N~ hCallWnd[index]=hWnd;
K*Tj; HotKey[index]=cKey;
`>^2MHF3LT HotKeyMask[index]=cMask;
)L?JH?$C bAdded=TRUE;
W (N@`^ KeyCount++;
ZJz6{cY break;
ve.rpF\ }
[ Fid }
kFPZ$8e return bAdded;
Xrpzc~( }
+R}(t{b# > <WR]`G BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
g0@i[&A@{ {
KD]8n]c BOOL bRemoved=FALSE;
%a-:f)@ for(int index=0;index<MAX_KEY;index++){
Jq1 Zb if(hCallWnd[index]==hWnd){
!QoOL<(){ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
k8E'wN hCallWnd[index]=NULL;
ZRYs7 4< HotKey[index]=0;
<5*cc8 HotKeyMask[index]=0;
eup#.#J bRemoved=TRUE;
]kC/b^~+m KeyCount--;
^hOnLy2 break;
v%t "N }
{3Z&C$:s }
R3;GMe@D# }
3RpDIl`0 return bRemoved;
~Ein)5 }
U[5 D.G+*h@ g void VerifyWindow()
DJSSc {
3DRXao for(int i=0;i<MAX_KEY;i++){
{ Z<4 if(hCallWnd
!=NULL){ F5Tah{
if(!IsWindow(hCallWnd)){ b?U!<s.
hCallWnd=NULL; %H\i}}PTe
HotKey=0; lUXxpv1m
HotKeyMask=0; U[9`:aV;
KeyCount--; aagN-/mgm
} Cs$wgm*
} =VkbymIZ4y
} OZdiM&Zss
} h@$M.h@mcG
@;m7u
BOOL CHookApp::InitInstance() /YYI
4
{ Mfjj+P
AFX_MANAGE_STATE(AfxGetStaticModuleState()); pQc5'*FKd
hins=AfxGetInstanceHandle(); WTi8
InitHotkey(); OF^v;4u
return CWinApp::InitInstance(); 9I*zgM!F
} F)4Y;;#
_uL{@(
int CHookApp::ExitInstance() )+2GF0%
{ ?[Xv(60]
VerifyWindow(); -~Kw~RX<(
UnInit(); ]Bw2> 6W
return CWinApp::ExitInstance(); l;$HGoJ
} `9SRiy
/5:C$ik
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Sw~jyUEr
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xMI4*4y(
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,yW BO
#if _MSC_VER > 1000 w4Nm4To
#pragma once [ h7nOUL!
#endif // _MSC_VER > 1000 CSx V^
U1<EAGo|
class CCaptureDlg : public CDialog ]v7f9MC'\
{ der'<Q.U:k
// Construction UCzIOxp}
public: S0C
7'H%?#
BOOL bTray; Y9fktg.
BOOL bRegistered; #N\kMJl$l
BOOL RegisterHotkey(); LU5e!bP
UCHAR cKey; 6jFc'
UCHAR cMask; C*kGB(H7
void DeleteIcon(); &6nOCU)
void AddIcon(); zSMNk AM
UINT nCount; 1wpT"5B
void SaveBmp(); 26|2r
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?qwTOi
// Dialog Data zJNiAc
//{{AFX_DATA(CCaptureDlg) V,?i]q;5
enum { IDD = IDD_CAPTURE_DIALOG }; {Lu-!}\NP
CComboBox m_Key; `MFw2nu@t
BOOL m_bControl; :JW!$?s8H
BOOL m_bAlt; x j~/C5@
BOOL m_bShift; GEU:xn
CString m_Path; D. !m*oq
CString m_Number; 4;@|tC|u
//}}AFX_DATA i_?";5B"
// ClassWizard generated virtual function overrides y\&GPr
//{{AFX_VIRTUAL(CCaptureDlg) 7)sEW#d!
public: K:&FWl.
virtual BOOL PreTranslateMessage(MSG* pMsg); .ky((
protected: z+5l:f
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~[bS+]d!
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); i{zg{$ U
//}}AFX_VIRTUAL UD6D![e
// Implementation '3B`4W,
protected: F/z$jj)
HICON m_hIcon; L<bZVocOb_
// Generated message map functions Onoi ^MDy
//{{AFX_MSG(CCaptureDlg) NQzpgf|h
virtual BOOL OnInitDialog(); v2R41*z,
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %KL"f
afx_msg void OnPaint(); L|4kv
afx_msg HCURSOR OnQueryDragIcon(); !HyPe"`oL
virtual void OnCancel(); 6@kKr
afx_msg void OnAbout(); 4Eh 2sI
afx_msg void OnBrowse(); ?eD,\G
afx_msg void OnChange(); 5^lroC-(x
//}}AFX_MSG j&n][=PL
DECLARE_MESSAGE_MAP() hXr`S4aJ
}; e6n1/TtqM
#endif ~_v?M%5i
|&vQ1o|}
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file | _/D-m*
#include "stdafx.h" [V'3/#Z
#include "Capture.h" tpw0j
CVu
#include "CaptureDlg.h" &>kklP
#include <windowsx.h> #;GIvfW
#pragma comment(lib,"hook.lib") FtbqZN[
#ifdef _DEBUG \,jrug<C$^
#define new DEBUG_NEW Qzy[
#undef THIS_FILE {H
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static char THIS_FILE[] = __FILE__; yyZ}qnbx]
#endif Bs2.$~
#define IDM_SHELL WM_USER+1 k{>rI2;
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QA_SS'*
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v#u]cmI
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vaQZ1a,
class CAboutDlg : public CDialog '~i;g.n=}-
{ Zj;2>
public: (3z: ;
CAboutDlg(); 9!sx
// Dialog Data It,m %5
Py
//{{AFX_DATA(CAboutDlg) JJJlgr]#
enum { IDD = IDD_ABOUTBOX }; g;)xf?A9q
//}}AFX_DATA -
Z?rx5V;t
// ClassWizard generated virtual function overrides ZAe>MNtW
//{{AFX_VIRTUAL(CAboutDlg) r:.5O F}
protected: ='f<_FD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]Hk8XT@Q+
//}}AFX_VIRTUAL <4s$$Uw}6%
// Implementation NQefrof
protected: 3vTX2e.w
//{{AFX_MSG(CAboutDlg) >o #^r;
//}}AFX_MSG '@'~_BBZP
DECLARE_MESSAGE_MAP() \z!*)v/{-
}; w$ Lpuun{
)yp+!\
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]|g{{PWH
{ S^|Uzc
//{{AFX_DATA_INIT(CAboutDlg) .Lz\/ OS
//}}AFX_DATA_INIT SrzlR)
}
}Y\Ayl
a x1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +k]9n*^uz
{ ^luAX
}*
CDialog::DoDataExchange(pDX); (9q61zA
//{{AFX_DATA_MAP(CAboutDlg) "orZje9AC
//}}AFX_DATA_MAP cQEK>aAd
} `[\*1GpAo
NyU~8?bp
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hPtSY'_@_
//{{AFX_MSG_MAP(CAboutDlg) w :2@@)pr
// No message handlers Sd?:+\bS;
//}}AFX_MSG_MAP \M^L'Mkj
END_MESSAGE_MAP() {`fhcEC
1GB$;0 W),
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) krwY_$q
: CDialog(CCaptureDlg::IDD, pParent) =1g
{ ##VS%&{
//{{AFX_DATA_INIT(CCaptureDlg) g+8{{o=
m_bControl = FALSE; yv| |:wZC
m_bAlt = FALSE; #I[tsly}
m_bShift = FALSE; >*rsR R
m_Path = _T("c:\\"); `9M:B&
m_Number = _T("0 picture captured."); +jD?h-]
nCount=0; b*=eMcd
bRegistered=FALSE; PY7j uS[+
bTray=FALSE; H&\IgD
//}}AFX_DATA_INIT :NJb<%$
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *IWO ,!
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z VleJ!d
} @F)51$Ld
A2 r1%}{
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )@)wcf!b
{ FNlzpCT~L
CDialog::DoDataExchange(pDX); 6LZ(bP'd;
//{{AFX_DATA_MAP(CCaptureDlg) ]CyWL6z
DDX_Control(pDX, IDC_KEY, m_Key); ^sIxR*C[v
DDX_Check(pDX, IDC_CONTROL, m_bControl); {M:Fsay>p
DDX_Check(pDX, IDC_ALT, m_bAlt);
cl4`FU
DDX_Check(pDX, IDC_SHIFT, m_bShift); dn/0>|5OF(
DDX_Text(pDX, IDC_PATH, m_Path); n[4F\I>
DDX_Text(pDX, IDC_NUMBER, m_Number); }R5>ja0
//}}AFX_DATA_MAP *qKPZb~
} vy W/f
{U8Sl.
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9ui_/[K
//{{AFX_MSG_MAP(CCaptureDlg) xC;b<~zN
ON_WM_SYSCOMMAND() 4$9WJ~V{
ON_WM_PAINT() Q#NXJvI
ON_WM_QUERYDRAGICON() B0I(/ 7
ON_BN_CLICKED(ID_ABOUT, OnAbout) Fy^*@&
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =N,9#o6^
ON_BN_CLICKED(ID_CHANGE, OnChange) mKY}+21!Q
//}}AFX_MSG_MAP vfAR^*7e
END_MESSAGE_MAP() Arh0m. w
],ioY*4G
BOOL CCaptureDlg::OnInitDialog() HHa
XK
{ 1(0LX^%
CDialog::OnInitDialog(); TJ9JIxnS
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I3uS?c
ASSERT(IDM_ABOUTBOX < 0xF000); X%Jq9_
CMenu* pSysMenu = GetSystemMenu(FALSE); :-HVK^$%
if (pSysMenu != NULL) i-Ck:-J
{ 4Z>KrFO
CString strAboutMenu; --E_s/
strAboutMenu.LoadString(IDS_ABOUTBOX); 1~\YJEsb}d
if (!strAboutMenu.IsEmpty()) Up?w>ly
{ d5&avL\
pSysMenu->AppendMenu(MF_SEPARATOR); b%<-(o/
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); bL\ab
} O'y8[<
} yHL 2!
SetIcon(m_hIcon, TRUE); // Set big icon E5 "%-fAJ
SetIcon(m_hIcon, FALSE); // Set small icon b:Oa4vBa
m_Key.SetCurSel(0); 8'J"+TsOW
RegisterHotkey(); g[<K FVlG
CMenu* pMenu=GetSystemMenu(FALSE); CDcZ6.f
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c!l=09a~a+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }$5S @,
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); t_1(Ex
return TRUE; // return TRUE unless you set the focus to a control .s-X%%e\
} gj{2"tE
c?oNKqPzg
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |fX
@o0H
{ 6$-Ex
if ((nID & 0xFFF0) == IDM_ABOUTBOX) t-_~jZ<
{ 0~{jgN~
CAboutDlg dlgAbout; 3u +A/
dlgAbout.DoModal(); cp.c$
} iev02 8M
else vd`;(4i#X
{ GUyMo@g
CDialog::OnSysCommand(nID, lParam); A*tG[)
} %9ef[,WT
} KEF"`VTB@
KSsv~!3Yf
void CCaptureDlg::OnPaint() jA@js v
{ C}grY5:
if (IsIconic()) BUR96YN.
{ ?B>
{rj
CPaintDC dc(this); // device context for painting )U0`?kD
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); TtA6N8G
// Center icon in client rectangle \FOoIY!.x
int cxIcon = GetSystemMetrics(SM_CXICON); K(P24Z\#
int cyIcon = GetSystemMetrics(SM_CYICON); #~]S
CRect rect; SSH ))zJ
GetClientRect(&rect); Y'tPD#|r
int x = (rect.Width() - cxIcon + 1) / 2; {&Kck>C'
int y = (rect.Height() - cyIcon + 1) / 2; E`68Z/%
// Draw the icon eZpyDw C{
dc.DrawIcon(x, y, m_hIcon); OxGKtnAjf
} F)dJws7-
else bHx09F]
{ r}>8FE9S'H
CDialog::OnPaint(); )EQWc0iKG
} S8-3Nv'
} <1i:Z*l.
r(=
HCURSOR CCaptureDlg::OnQueryDragIcon() yH}(0
{ !,8jB(
return (HCURSOR) m_hIcon; }pk)\^/w/
} z|,YO6(L
LLp/ SWe
void CCaptureDlg::OnCancel() /[
_aw&W}Z
{ ^2C)Wk$
if(bTray) :E
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DeleteIcon(); hKa<9>MI`
CDialog::OnCancel(); kY d'6+m
} :iW+CD)j
~*aPeJ
void CCaptureDlg::OnAbout() !EO*xxQ
{ f;os\8JdM
CAboutDlg dlg; -J7BEx
dlg.DoModal(); z$#q'+$
} z?T;2/_7
%t&
void CCaptureDlg::OnBrowse() k@[\C`P
{ n=t50/jV3=
CString str; i_/A,5TF
BROWSEINFO bi; mab921-n
char name[MAX_PATH]; S5o\joc
ZeroMemory(&bi,sizeof(BROWSEINFO)); T22
4L.?
bi.hwndOwner=GetSafeHwnd(); ]O}TK^%
bi.pszDisplayName=name; '0\,waEu
bi.lpszTitle="Select folder"; Uk@du7P1k
bi.ulFlags=BIF_RETURNONLYFSDIRS; ky2n%<0]
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'mwgHo<u
if(idl==NULL) Q,pnh!.-c
return; (<bYoWrK#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); v)+E!"R3.
str.ReleaseBuffer(); +Cf"rN
m_Path=str; j@g`Pm%u`
if(str.GetAt(str.GetLength()-1)!='\\') ^,-2";2Xh
m_Path+="\\"; gX29c
UpdateData(FALSE); HL8onNq
} QMO.Bnek
:V,agAMn
void CCaptureDlg::SaveBmp() !{u`}:\
{ l\f
/(&,
CDC dc; Nuc;Y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); @k+&89@G
CBitmap bm; +Tf4SJ
int Width=GetSystemMetrics(SM_CXSCREEN); q4y P\B
int Height=GetSystemMetrics(SM_CYSCREEN); *'?aXS -'r
bm.CreateCompatibleBitmap(&dc,Width,Height); bC a%$
CDC tdc; $<NrJgQ
tdc.CreateCompatibleDC(&dc); 2Dc2uU@`r
CBitmap*pOld=tdc.SelectObject(&bm); _?VMSu
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z;v5L/;
tdc.SelectObject(pOld); 'dXGd.V7u
BITMAP btm; K_SURTys
bm.GetBitmap(&btm); y$Nqw9
DWORD size=btm.bmWidthBytes*btm.bmHeight; }Gvu!a#R
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !=uaB.
BITMAPINFOHEADER bih; \v\f'eQ
bih.biBitCount=btm.bmBitsPixel; {[I]pm~n
bih.biClrImportant=0; .ei5+?V<i
bih.biClrUsed=0; <cof
bih.biCompression=0; $O'IbA
bih.biHeight=btm.bmHeight; ;!~&-I0l
bih.biPlanes=1; Am'%tw
~
bih.biSize=sizeof(BITMAPINFOHEADER); M6nQ17\{
bih.biSizeImage=size; b((>?=hh
bih.biWidth=btm.bmWidth; Jn :h;|9w
bih.biXPelsPerMeter=0; ax)>rP,V
bih.biYPelsPerMeter=0; Q9G\T:^ury
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =Ch^;Wyt
static int filecount=0; |Eyn0\OA
CString name; uM"_3je{W2
name.Format("pict%04d.bmp",filecount++); DXI{ jalL
name=m_Path+name; &~Hx!]uc
BITMAPFILEHEADER bfh; pie8 3Wy>
bfh.bfReserved1=bfh.bfReserved2=0; !"d"3coQ?
bfh.bfType=((WORD)('M'<< 8)|'B'); SH1S_EQ<
bfh.bfSize=54+size; FF5|qCV/z
bfh.bfOffBits=54; IGnP#@`5]
CFile bf; m;4qs#qCg?
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n^lr7(!6
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); luWr.<1
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1m~-q4D)V
bf.WriteHuge(lpData,size); W9D~:>^YP
bf.Close(); BjSd\Ul
nCount++; {D$5M/$
} |tr^
`Z
GlobalFreePtr(lpData); 6*&$ha}X
if(nCount==1) F
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m_Number.Format("%d picture captured.",nCount); 73p7]Uo
else -F$v`|(O+
m_Number.Format("%d pictures captured.",nCount); M\_IQj
UpdateData(FALSE); ieap
} "Snt~:W>
GBY-WN4sc[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ;Yve m
{ xNd p]u
if(pMsg -> message == WM_KEYDOWN) Oq9E$0JW
{ PjG^L
FX
if(pMsg -> wParam == VK_ESCAPE) H~NK:qRzK
return TRUE; 11iV{ h
if(pMsg -> wParam == VK_RETURN) Y*QoD9<T?;
return TRUE; -=WQed}
} s-801JpiJ
return CDialog::PreTranslateMessage(pMsg); kXroFLrY
} L$z(&%Nx
A\w"!tNM|
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h(K}N5`
{ ucYweXsO3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =5;tB
SaveBmp(); &_$0lIDQ
return FALSE; Qv
WvS9]
} Sby(?yg
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nv<t$r
CMenu pop; A2.GNk
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); v[<x>?iD_
CMenu*pMenu=pop.GetSubMenu(0); w9w=2 *
pMenu->SetDefaultItem(ID_EXITICON); Sq SiuO.D
CPoint pt; ` 7P%muY.
GetCursorPos(&pt); X`20=x
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >{)\GK0i7
if(id==ID_EXITICON) -V&nlP
DeleteIcon(); 8ZF!}kb0F
else if(id==ID_EXIT) }nRTw2-z
OnCancel(); }X/>WiGh:
return FALSE; Ye| (5f
} b]4\$ rW7
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A<y]D.Z"
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) vW-o%u*
AddIcon(); n-u
HKBq
return res; $ ~%w21?&
} 2~l +2..
xOx=Z\ c
void CCaptureDlg::AddIcon() /Un\P
{ - -\eYVh[
NOTIFYICONDATA data; t52KF#+>
data.cbSize=sizeof(NOTIFYICONDATA); -EJj j {
CString tip; jcp6-XM
tip.LoadString(IDS_ICONTIP); 25j?0P"&
data.hIcon=GetIcon(0); d%K&
data.hWnd=GetSafeHwnd(); VXnWY8\
strcpy(data.szTip,tip); !CdF,pd/)m
data.uCallbackMessage=IDM_SHELL; NY6;\ 7!n
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; T/PmT:Qg`
data.uID=98; %O$=%"D6
Shell_NotifyIcon(NIM_ADD,&data); t*J?#r
ShowWindow(SW_HIDE); !>#gm7
bTray=TRUE; ceuEsQ}
} ..R JHa6B
q`3HHq
void CCaptureDlg::DeleteIcon() eH V#Mey[
{ PpLiH9}
NOTIFYICONDATA data; ?_B'#,tI
data.cbSize=sizeof(NOTIFYICONDATA);
Q@!XVQx4
data.hWnd=GetSafeHwnd(); dT{GB!jz
data.uID=98; 1k]L ,CX
Shell_NotifyIcon(NIM_DELETE,&data); C/4r3A/u
ShowWindow(SW_SHOW); }}Zg/(
SetForegroundWindow(); vq+4so
)/S
ShowWindow(SW_SHOWNORMAL); 2Ab`i!#
bTray=FALSE; z(u,$vZ_
} r>}z|I'
&]tm'N25
void CCaptureDlg::OnChange() 3+\Zom4
{ Z*b$&nM
RegisterHotkey(); <G0Ut6J>
} 0 ;].q*|#
<MKXFV
BOOL CCaptureDlg::RegisterHotkey() !>N+a3
{ kC ALJRf~d
UpdateData(); azzG
UCHAR mask=0; V|TD+7.`QB
UCHAR key=0; jNI9 .45y
if(m_bControl) w9StW94p
mask|=4; +k
h
Tl:
if(m_bAlt) 1*e7NJ/.,
mask|=2; };R2M
if(m_bShift) WL|<xNL
mask|=1; bk1.H@8
key=Key_Table[m_Key.GetCurSel()]; *&tTiv{^
if(bRegistered){ wv`ar>qVL
DeleteHotkey(GetSafeHwnd(),cKey,cMask); VN0KK
1I
bRegistered=FALSE; ^ZIs >.'
} +^jm_+
cMask=mask; J 7sH]
cKey=key; (Y*9[hm
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -Mf-8zw8G
return bRegistered; ^oYRBEIJH
} 6XHM `S
0Y'ow=8M
四、小结 iUFG!,+d
|N}*
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。