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:
:^[HDI-[2
Z<^TO1xs9B 一、实现方法
?N/6m b w2KD7 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:
bJ#]Xm(]D X
cDu&6Dy #pragma data_seg("shareddata")
<JNiW8 PG HHOOK hHook =NULL; //钩子句柄
jt? .g' UINT nHookCount =0; //挂接的程序数目
/;rPzP4K6 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
SB#Y^! static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
;LjTsF' static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
a][QY1E@? static int KeyCount =0;
oR_qAb static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
1QPS=;|) #pragma data_seg()
CW9vC D8S3YdJ 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。
p3R: 3E6p svTKt%6X 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:
^^C@W?.z yl'@p5n BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Y!C8@B$MR3 cKey,UCHAR cMask)
4>I >y@^ {
_I1:|y BOOL bAdded=FALSE;
A;\1`_i0 for(int index=0;index<MAX_KEY;index++){
quGvq"Y> if(hCallWnd[index]==0){
ejjL>'G/|% hCallWnd[index]=hWnd;
-xk.wWpV HotKey[index]=cKey;
|1[3RnGS HotKeyMask[index]=cMask;
UBZ37P bAdded=TRUE;
g{d(4=FM KeyCount++;
6+s10? break;
wTw)GV4 }
5y`n8. (? }
iE8 return bAdded;
f}C$!Lhs }
]dj
W^C]94 //删除热键
{BS}9jZx BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o&Vti"fpC {
{Jx-Zo>' BOOL bRemoved=FALSE;
vdt ": for(int index=0;index<MAX_KEY;index++){
Or9"T ]z if(hCallWnd[index]==hWnd){
XVwJr""+ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
;p_@%*JAx hCallWnd[index]=NULL;
QO&{Jx.^[ HotKey[index]=0;
_hz}I>G@B HotKeyMask[index]=0;
V~%C me bRemoved=TRUE;
a#L:L8T;j KeyCount--;
5zf bI break;
#FNSE*Y }
o,D7$WzL }
<jwQ&fm)/R }
"7X[@xX@ return bRemoved;
{k"t`uo_ }
ah9P
C7[ (O@fgBM uZ/XI {/ DLL中的钩子函数如下:
g;n6hXq4 kQt#^pO) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
rTmVHt {
r|,_qNrw BOOL bProcessed=FALSE;
dvX[,*wz if(HC_ACTION==nCode)
I)YUGA5 {
j'QPJ(`~1l if((lParam&0xc0000000)==0xc0000000){// 有键松开
mN&B|KWU switch(wParam)
K275{ydN {
%p t^? case VK_MENU:
w28&qNha MaskBits&=~ALTBIT;
mY1Gm| break;
2.>aL case VK_CONTROL:
M8{J MaskBits&=~CTRLBIT;
{IgLH`@ break;
MX)mm^A case VK_SHIFT:
;b6h/*;' MaskBits&=~SHIFTBIT;
u"s@eN break;
92 oUQ EK default: //judge the key and send message
mNk@WY_F break;
# X`t~Y' }
$3'xb/3| for(int index=0;index<MAX_KEY;index++){
W_bp~Wu
if(hCallWnd[index]==NULL)
GnFm*L continue;
pg9feIW1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
s,;7m {
49iqrP' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
E3"j7y[S bProcessed=TRUE;
][TA7pDPV }
+
\jn$>E }
vXLGdv:: }
WZ6'"Cz` else if((lParam&0xc000ffff)==1){ //有键按下
kuI$VC switch(wParam)
JUpb*B_z {
pt_]&3\e case VK_MENU:
3o^~6A MaskBits|=ALTBIT;
~LF1$Cai break;
lK%)a +2 case VK_CONTROL:
%F2T`?t: MaskBits|=CTRLBIT;
57jDsQAj break;
=_=0l+\} case VK_SHIFT:
{\u6Cj x MaskBits|=SHIFTBIT;
zb,YYE1 break;
i[4t`v'Dk default: //judge the key and send message
@=NTr break;
GvTA/zA }
qF3s&WI for(int index=0;index<MAX_KEY;index++){
qp{3I("_ if(hCallWnd[index]==NULL)
V
M{Sng continue;
JKY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lKBI3oYn {
q5G`N>"V SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Y1-=H)G bProcessed=TRUE;
W1
\dGskV }
m`9P5[m#x> }
.$U=ngj\t }
Sah!|9 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
m}32ovpw for(int index=0;index<MAX_KEY;index++){
G{u(pC^ if(hCallWnd[index]==NULL)
!IC@^kkh{ continue;
$[U:Dk} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Uo0[ZsFD SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
=:=s //lParam的意义可看MSDN中WM_KEYDOWN部分
sUk&NM%> }
=J0r,dR }
2=
)V"lR\ }
?Ll1B3f return CallNextHookEx( hHook, nCode, wParam, lParam );
95.s,'0 }
eHc.#OA& Im"8+756 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
Fgw$;W 5 D[`nU} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
q-r5z GI BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?6V U4nK/* /}Ct2w&<k 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:
Q;k
D Jo @g]>D LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
S76xEL {
$VJE&b if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
4bq+(CI6 {
\F9HsR6 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
6g)X&pZ SaveBmp();
j)mi~i*U return FALSE;
?OBB)hj }
rI'kZ0& …… //其它处理及默认处理
,veo/k<"r8 }
1[]V @P^ ]T>|Y0 | c|F2 6$rv 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。
F#Bi*YY ')Qb,#/,% 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。
7,3 g{8 A",Xn/d 二、编程步骤
JpZ3T~Wrf 0IxHB|^$ 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";
J:dNV<A^ |k<5yj4? 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
F-<c.0;6 DcsQ 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;
7!A3PDAe R_duPaWc@ 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;
X=[`+= k8w:8*y'. 5、 添加代码,编译运行程序。
_Kv;hR> IFkU8EK&B 三、程序代码
_/5xtupxE ksV^Y=] ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
t]6
4= #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
) %bY2
pk #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6BObV/S Jg #if _MSC_VER > 1000
bj=YFV+ #pragma once
/jN&VpDG #endif // _MSC_VER > 1000
zJTSg #ifndef __AFXWIN_H__
Dw&_6\F@ #error include 'stdafx.h' before including this file for PCH
3gz4c1 s^: #endif
}b/G{92 #include "resource.h" // main symbols
fH 0&Wc3yC class CHookApp : public CWinApp
WZf}1.Mh* {
`_E@cZ4 public:
fYzZW CHookApp();
,,~|o3cfq // Overrides
aq$adPtu // ClassWizard generated virtual function overrides
(@cZmU, //{{AFX_VIRTUAL(CHookApp)
+f\r?8s public:
j12khp? virtual BOOL InitInstance();
Wa'm]J virtual int ExitInstance();
r~sQdf //}}AFX_VIRTUAL
'+iqbcUd, //{{AFX_MSG(CHookApp)
qdwjg8fo4Z // NOTE - the ClassWizard will add and remove member functions here.
cB4p.iO
// DO NOT EDIT what you see in these blocks of generated code !
e2Df@8> //}}AFX_MSG
O^4Ko} DECLARE_MESSAGE_MAP()
JDm7iJxc_ };
UP@-@syGw LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
g({dD; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*!u
a? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?q hme BOOL InitHotkey();
u
=|A BOOL UnInit();
z/t+t_y #endif
ym6gj#2m QE~#eo //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/;xmM2B' #include "stdafx.h"
T^.W' #include "hook.h"
`YPNVm<3) #include <windowsx.h>
=xPBolxm5U #ifdef _DEBUG
Y 9~z7 #define new DEBUG_NEW
usOIbrQ #undef THIS_FILE
S<DS|qOo static char THIS_FILE[] = __FILE__;
>TwL&la #endif
P*6&0\af| #define MAX_KEY 100
Oxr?y8C~ #define CTRLBIT 0x04
)Tj\ym-Vl #define ALTBIT 0x02
J2Eb"y>/; #define SHIFTBIT 0x01
Pt8 U0)i) #pragma data_seg("shareddata")
Xw<N nvz6 HHOOK hHook =NULL;
"~aCW~ UINT nHookCount =0;
^r0mx{i& static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Wj#Gm static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
5mF"nY&lI static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
IQQWp@w#8 static int KeyCount =0;
"P{T] static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
F<N{ x^ #pragma data_seg()
I:,D:00+ HINSTANCE hins;
Wo~#R void VerifyWindow();
@M ]7',2" BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
yf7$m_$C' //{{AFX_MSG_MAP(CHookApp)
MYF6tZ* // NOTE - the ClassWizard will add and remove mapping macros here.
nh+f,HtSt // DO NOT EDIT what you see in these blocks of generated code!
. [5{ //}}AFX_MSG_MAP
"jEf$] END_MESSAGE_MAP()
jwZBWt )5 w65D;9/; CHookApp::CHookApp()
3*$)9' {
i;8tA! // TODO: add construction code here,
&[4lP~ // Place all significant initialization in InitInstance
Z}4
`y"By }
4O** %!| [G[|auKF CHookApp theApp;
XhxCOpO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>6"u{Qmr {
q$6Tb BOOL bProcessed=FALSE;
-P|st;?# if(HC_ACTION==nCode)
6zJfsKf$ {
-VlXZj@u+ if((lParam&0xc0000000)==0xc0000000){// Key up
L/n?1'he switch(wParam)
2q,> *B? {
#iAEcC0k5 case VK_MENU:
Wf>scl`s MaskBits&=~ALTBIT;
h$~\to$C break;
TEi~X2u case VK_CONTROL:
]M5w!O! MaskBits&=~CTRLBIT;
Q`7.-di break;
?O<D&CvB case VK_SHIFT:
cN\Fgbt MaskBits&=~SHIFTBIT;
&p#$}tm break;
1C'_I default: //judge the key and send message
Z/hgr|&} break;
\,5OPSB }
O5eTkKUc for(int index=0;index<MAX_KEY;index++){
b 6B5 if(hCallWnd[index]==NULL)
I?!7]S n$ continue;
k(.6K[b if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
dCkk5&2n {
PhOtSml0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
y,QJy=? bProcessed=TRUE;
:gJ?3LwTf }
t\%gP@? }
/"%(i#<)xs }
"`4V^1 else if((lParam&0xc000ffff)==1){ //Key down
bI"_hvcFp switch(wParam)
\ tx4bV# {
v8!Ts" case VK_MENU:
QBI;aG<+b> MaskBits|=ALTBIT;
,aBo
p# break;
>=Pn\"j case VK_CONTROL:
:v>Nz7SB MaskBits|=CTRLBIT;
t}]R0O.s break;
qoXncdDHZ case VK_SHIFT:
^yo~C3r~ MaskBits|=SHIFTBIT;
>MeM break;
n6Qsug$z default: //judge the key and send message
#[C=LGi break;
_rU%DL? }
1SGLA"r for(int index=0;index<MAX_KEY;index++)
x<es1A'u6 {
F+3}Gkn if(hCallWnd[index]==NULL)
Lradyo44u\ continue;
.sOEqwO}> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?]]d
s] {
C>:'@o
Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~!& "b1
bProcessed=TRUE;
.!pr0/9B }
%!X|X,b^O }
U'(@?]2<G }
"$Mz>]3&q if(!bProcessed){
shAoib?Kw: for(int index=0;index<MAX_KEY;index++){
iYk4=l
if(hCallWnd[index]==NULL)
6,q}1- continue;
6*\WH% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
5m]N%{<jAB SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
iir]M`A.- }
. h7`Q{ }
:7P/ZC% }
hmQ;!9 return CallNextHookEx( hHook, nCode, wParam, lParam );
L
H8iHB }
+xc1cki_{ 0<";9qN)6 BOOL InitHotkey()
(q]_&%yW {
|r%NMw #y if(hHook!=NULL){
t0*,%ge:< nHookCount++;
Oe["4C return TRUE;
Fb0r(vQ^ }
/5$;W'I else
!RD<" hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3\B28m if(hHook!=NULL)
4ru-qF nHookCount++;
x<fF1]; return (hHook!=NULL);
KW1b #g%Z }
QU;bDNq,c BOOL UnInit()
qG<3H!Z!ky {
Lq6R_udp if(nHookCount>1){
UqwU3 nHookCount--;
+M=`3jioL return TRUE;
<lo\7p$A }
.*Mp+Q}^ BOOL unhooked = UnhookWindowsHookEx(hHook);
~stJO]) a if(unhooked==TRUE){
$,)PO
Z nHookCount=0;
NrK.DY4 hHook=NULL;
Y*Ra!]62 }
ls*bCe return unhooked;
45aUz@ }
\QvoL wJ%;\06 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,ut-Di=6 {
CVt:tV BOOL bAdded=FALSE;
n LD1j for(int index=0;index<MAX_KEY;index++){
z*FCd6X if(hCallWnd[index]==0){
aJ/}ID hCallWnd[index]=hWnd;
=}D9sT HotKey[index]=cKey;
R ~ZcTY[8 HotKeyMask[index]=cMask;
("r\3Mvs bAdded=TRUE;
.V
KeyCount++;
3HEm-pok break;
)p^" J| }
tg%#W` }
@/,:".
SM return bAdded;
/2.}m`5 }
K8bKTG \ =f/CBYNw@V BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0;Oe&Y {
yCvP-?2 BOOL bRemoved=FALSE;
srCpgs]h for(int index=0;index<MAX_KEY;index++){
77b^d9! ~ if(hCallWnd[index]==hWnd){
xMs!FMn[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I?&/J4o: hCallWnd[index]=NULL;
kfV}ta'^S HotKey[index]=0;
-Lhq.Q*a HotKeyMask[index]=0;
B{ A b# bRemoved=TRUE;
:*} -,{uX KeyCount--;
'EHtA9M break;
YWFq&II|Z }
uo8[,' }
omMOA }
Cvp!(<<gK return bRemoved;
ZccvZl ;b }
3%[;nhbA7 g2;lEW void VerifyWindow()
;p+[R+ ) {
[eO^C for(int i=0;i<MAX_KEY;i++){
:;hz!6! if(hCallWnd
!=NULL){ 7,lnfCm H
if(!IsWindow(hCallWnd)){ lsaA
hCallWnd=NULL; r@a]fTf
HotKey=0; "qrde4O
HotKeyMask=0; 3Cw}y55_y
KeyCount--; 21$E.x 6
} z"<S$sDh
} \l=A2i7TQ
} y;ey(
} c^_+<C-F
;ab[YMkH
BOOL CHookApp::InitInstance() 5i6Ji(
{ OkRb3}
AFX_MANAGE_STATE(AfxGetStaticModuleState());
2po8n_
hins=AfxGetInstanceHandle(); EZWWvL
InitHotkey(); PlCw,=K 8f
return CWinApp::InitInstance(); J)g
+I
} /[Nkk)8-
"I=Lbh-`
int CHookApp::ExitInstance() -d?<t}a
{ `&=%p|
VerifyWindow(); D Z~036
UnInit(); (Tq)!h35B
return CWinApp::ExitInstance(); A6KP(@
} "'DPb%o
@w33u^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file t,Tq3zB
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =>S[Dh
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @[D5{v)S
#if _MSC_VER > 1000 C,ldi"|
#pragma once qi@Nz=t#HJ
#endif // _MSC_VER > 1000 ]#N8e?b,
;-i)}<
class CCaptureDlg : public CDialog ~I")-2"B
{ h/5V~ :)
// Construction ZXhNn<
public: vmxS^_I
BOOL bTray; ^E,
#}cW
BOOL bRegistered; klmbbLce
BOOL RegisterHotkey(); Cno[:iom
UCHAR cKey; y@}WxSK*0
UCHAR cMask; 9|jMN
j]vo
void DeleteIcon(); UaG&HGg]!
void AddIcon(); )l*3^kwL{U
UINT nCount; tv-SX=T
void SaveBmp(); hXH+C-%{
CCaptureDlg(CWnd* pParent = NULL); // standard constructor * k\;G?
// Dialog Data L]YJ#5
//{{AFX_DATA(CCaptureDlg) E\2f"s
enum { IDD = IDD_CAPTURE_DIALOG }; % M_F/ O
CComboBox m_Key; kJ* N`=
BOOL m_bControl; An]Vx<PD
BOOL m_bAlt; -R9{Ak
BOOL m_bShift; h 1'm[Y
CString m_Path; 6ZjUC1
CString m_Number; XcbEh
//}}AFX_DATA 9n5uO[D
// ClassWizard generated virtual function overrides ?5G;=#I
//{{AFX_VIRTUAL(CCaptureDlg) S!-t{Q+j^
public: UN<$F yb
virtual BOOL PreTranslateMessage(MSG* pMsg); G~zfPBN0D
protected: _+}o/449
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2(Xu?W 7d
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !FK)iQy$0
//}}AFX_VIRTUAL ,A#gF_8
// Implementation KsTE)@F:
protected: R<3 -!p1v
HICON m_hIcon; iQ;lvOja
// Generated message map functions s_Z5M2o
//{{AFX_MSG(CCaptureDlg) 1q
ZnyJ
virtual BOOL OnInitDialog(); 6d5q<C_3t
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iOAn/[^xk
afx_msg void OnPaint(); 3? k<e
afx_msg HCURSOR OnQueryDragIcon(); P(\x. d:
virtual void OnCancel(); '0Q/oU
afx_msg void OnAbout(); sCf)#6mI
afx_msg void OnBrowse(); ow+_g R-
afx_msg void OnChange(); D3tcwjXoW_
//}}AFX_MSG Qp@}v7Due
DECLARE_MESSAGE_MAP() ^c}kVQ\g3
}; >YdLB@
#endif [pt U}
fHuWBC_YO
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file un`4q-S7
#include "stdafx.h" e6y!,My<
#include "Capture.h" HKC&grp
#include "CaptureDlg.h" 7OPRf9+o
#include <windowsx.h> `OZiN;*|
#pragma comment(lib,"hook.lib") 1k%HGQM{
#ifdef _DEBUG Ea[SS@'R
#define new DEBUG_NEW Ix@nRc'
#undef THIS_FILE ~1Ffu x
static char THIS_FILE[] = __FILE__; ZlMS=<hgFx
#endif 6m:$RW
#define IDM_SHELL WM_USER+1 zo
]-,u
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V\c`O
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IUG}Q7w5
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; X2 <fS~m
class CAboutDlg : public CDialog ;+3@S`2r
{ /*6[Itm_h
public: L8pKVr
CAboutDlg(); ihct~y-9W
// Dialog Data ?5[$d{ Gjl
//{{AFX_DATA(CAboutDlg) !6 kn>447Y
enum { IDD = IDD_ABOUTBOX }; 3z k},8fu
//}}AFX_DATA K,bX<~e5
// ClassWizard generated virtual function overrides v# fny
//{{AFX_VIRTUAL(CAboutDlg) _GoFwVO
protected: T0o0_R
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r0<zy_d'
//}}AFX_VIRTUAL LCSJIt
// Implementation uesIkJ^Q[
protected: j3R}]F'C*
//{{AFX_MSG(CAboutDlg) f?QP(+M5.
//}}AFX_MSG Tkj
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DECLARE_MESSAGE_MAP() /mn'9=ks
}; p8iKZI]g
)ItW}1[I
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nx!+:P ,
{ T#}"?A|
//{{AFX_DATA_INIT(CAboutDlg) GG4FS
//}}AFX_DATA_INIT Jg&f.
} U*BI/wZ
$GD
Q1&Z
void CAboutDlg::DoDataExchange(CDataExchange* pDX) u`*1OqU
{ 0\1g-kc!v
CDialog::DoDataExchange(pDX); S""F58H n
//{{AFX_DATA_MAP(CAboutDlg) bhKe"#m|S
//}}AFX_DATA_MAP wEl/s P
} B?d+^sz]
;Yt'$D*CP
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `@&WELFv{
//{{AFX_MSG_MAP(CAboutDlg) GCrsf
// No message handlers F_iZ|B
//}}AFX_MSG_MAP QwnqysNx4
END_MESSAGE_MAP() $b) k
] $F%
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) uOx"oR|
: CDialog(CCaptureDlg::IDD, pParent) BWkTQd<t
{ z|<?=c2P
//{{AFX_DATA_INIT(CCaptureDlg) ^_=bssaOd
m_bControl = FALSE; b:x~Jz#%2
m_bAlt = FALSE; 8wCB}q C
m_bShift = FALSE; ,}^FV~
m_Path = _T("c:\\"); Rz<'&Z>;
m_Number = _T("0 picture captured."); ! ^aJS'aq
nCount=0; ZQsVSz( 1
bRegistered=FALSE; ;YrmT9Jx6
bTray=FALSE; ?{1& J9H
//}}AFX_DATA_INIT $L72%T
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
C5TC@ w1*
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |4Os_*tRKU
}
d-I&--"ju
lgefTT GX)
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <,t6A?YoMP
{ Go7 oj'"
CDialog::DoDataExchange(pDX); ( n!8>>+1C
//{{AFX_DATA_MAP(CCaptureDlg) 2}9M7Z",2
DDX_Control(pDX, IDC_KEY, m_Key); As|e=ut(
DDX_Check(pDX, IDC_CONTROL, m_bControl); i@ehD@.dH
DDX_Check(pDX, IDC_ALT, m_bAlt); (I#3![q
DDX_Check(pDX, IDC_SHIFT, m_bShift); I7;|`jN5K
DDX_Text(pDX, IDC_PATH, m_Path); fHgvh&FU
DDX_Text(pDX, IDC_NUMBER, m_Number); CeUC[cUQU
//}}AFX_DATA_MAP |Syulus
} N1JM[<PP
4=l$wg~;
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 76cT}l&.h8
//{{AFX_MSG_MAP(CCaptureDlg) r_Pi)MPc
ON_WM_SYSCOMMAND() C!|Yz=e
ON_WM_PAINT() fjqd16{Q
ON_WM_QUERYDRAGICON() s133N?
ON_BN_CLICKED(ID_ABOUT, OnAbout) M<P8u`)>4H
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #g<6ISuf
ON_BN_CLICKED(ID_CHANGE, OnChange) <,y> W!
//}}AFX_MSG_MAP
es<
END_MESSAGE_MAP() ZKai*q4?
gKtgW&PYm
BOOL CCaptureDlg::OnInitDialog() =X7_!vSv
{ $ByP 9=|
CDialog::OnInitDialog(); a`>H69(bU
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }ldpudU
ASSERT(IDM_ABOUTBOX < 0xF000); KCnm_4
CMenu* pSysMenu = GetSystemMenu(FALSE); P=Su)c
if (pSysMenu != NULL) z#2n+hwE
{ 5t-,5
CString strAboutMenu; \jx3Fs:Q
strAboutMenu.LoadString(IDS_ABOUTBOX); mp
z3o\n
if (!strAboutMenu.IsEmpty()) PJ^qE|X
{ -B?cF9
pSysMenu->AppendMenu(MF_SEPARATOR); aP#/%
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Q"H/RMo-
} L2OR<3*|Av
} <(i5hmuVd
SetIcon(m_hIcon, TRUE); // Set big icon ^,aI2vC
SetIcon(m_hIcon, FALSE); // Set small icon ER0B{b
m_Key.SetCurSel(0); 8#/y`ul
RegisterHotkey(); G=|~SYz
CMenu* pMenu=GetSystemMenu(FALSE); oXUb_/
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); L+}<gQJ(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); LL==2KNUo
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w/*m_O\!
return TRUE; // return TRUE unless you set the focus to a control 5GGO:
} 1x%B`d
UqNUX?(
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) n}c~+0`un
{ bAwKmk9C
if ((nID & 0xFFF0) == IDM_ABOUTBOX) l z-I[*bA
{ }Eh &'
CAboutDlg dlgAbout; O&,8X-Ix
dlgAbout.DoModal(); JfmYr47Pv
} W2'!Pc,W
else Fm*npK
{ QNH3\<IS
CDialog::OnSysCommand(nID, lParam); z"Mk(d@-E
} m"QDc[^Ge
} n~.$iN
GxEShSGOE
void CCaptureDlg::OnPaint() wxYGr`f
{ ZB`d&!W>
if (IsIconic()) 6@eF|GoP
{ :>U+HQll
CPaintDC dc(this); // device context for painting dFyGI?
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \`E^>6!]q
// Center icon in client rectangle wE}Wh5
int cxIcon = GetSystemMetrics(SM_CXICON); B9Hib1<8
int cyIcon = GetSystemMetrics(SM_CYICON); N1B$z3E*
CRect rect; -:E~Z_J`
GetClientRect(&rect); P^tTg
int x = (rect.Width() - cxIcon + 1) / 2; 2=/-,kOL_
int y = (rect.Height() - cyIcon + 1) / 2; :2K@{~8r
// Draw the icon *QV"o{V
dc.DrawIcon(x, y, m_hIcon); >H ?k0M`L
} ~9E_L?TW*
else w)`XM
{ /(.:l +[w[
CDialog::OnPaint(); LD1&8kJ*l
} s^K2,D]P
} t"Ah]sD
c+
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HCURSOR CCaptureDlg::OnQueryDragIcon() M X8|;t
{ _{-[1-lN5_
return (HCURSOR) m_hIcon; gKQV99
}
6su~SPh
1m#.f=u{R
void CCaptureDlg::OnCancel() *mbzK*
{ kwL|gO1L
if(bTray) S0QLM)
DeleteIcon(); {ywwJ
CDialog::OnCancel(); t%%()!|)j
} F"UI=7:o
&N._}ts
void CCaptureDlg::OnAbout() J=t}9.H~=
{ QS5t~rb
CAboutDlg dlg; 1^^8,.'
dlg.DoModal(); !ltq@8#_|
} "ayV8{m^3
BdF/(Pg
void CCaptureDlg::OnBrowse() )*>wa%[-q
{ bWAa:
r
CString str; sQac%.H;`U
BROWSEINFO bi; f!`?_
char name[MAX_PATH]; Hd\V?#H
ZeroMemory(&bi,sizeof(BROWSEINFO)); kM{8zpn
bi.hwndOwner=GetSafeHwnd(); Dws)
4hH
bi.pszDisplayName=name; ; Byt'S
bi.lpszTitle="Select folder"; nqm=snh
bi.ulFlags=BIF_RETURNONLYFSDIRS; mXOI"B9Sq
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z)M
"`2Ur
if(idl==NULL) 6UuN-7z!"
return; V<W;[#"
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H8FvI"J
str.ReleaseBuffer(); OyF=G^w
m_Path=str; wlJi_)!
if(str.GetAt(str.GetLength()-1)!='\\') } &B6
m_Path+="\\"; hdHz", )
UpdateData(FALSE); j2<+[h-
} ld@+p
94BH{9b5
void CCaptureDlg::SaveBmp() 8 O9^g4?
{ 5@m
,*n&[
CDC dc; ?$ e]K/*
dc.CreateDC("DISPLAY",NULL,NULL,NULL); iX]OF.:
CBitmap bm; mn?F;=qE
int Width=GetSystemMetrics(SM_CXSCREEN); :LY.C<8
int Height=GetSystemMetrics(SM_CYSCREEN); qBX_v5pvVA
bm.CreateCompatibleBitmap(&dc,Width,Height); !SW0iq[7j
CDC tdc; )|xu5.F
tdc.CreateCompatibleDC(&dc); J
W@6m
CBitmap*pOld=tdc.SelectObject(&bm); @6>Q&GYqt
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Lz.khE<
tdc.SelectObject(pOld); /DHgwpJ
BITMAP btm; LJ/He[r|[
bm.GetBitmap(&btm); oxlor,lw/
DWORD size=btm.bmWidthBytes*btm.bmHeight; vS>'LX
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); KD &nLm!
BITMAPINFOHEADER bih; ly17FLJ].
bih.biBitCount=btm.bmBitsPixel; /B@{w-N
bih.biClrImportant=0; .cHgYHa
bih.biClrUsed=0; k
i<X ^^
bih.biCompression=0; 9f( X7kt
bih.biHeight=btm.bmHeight; :}zyd;Rc
bih.biPlanes=1; w~b:9_reY
bih.biSize=sizeof(BITMAPINFOHEADER); hi1Ial\Y
bih.biSizeImage=size; f47]gtB-
bih.biWidth=btm.bmWidth; FpRYffT 9u
bih.biXPelsPerMeter=0; O D}RnKL
bih.biYPelsPerMeter=0; ~~OFymQ%?q
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); **hQb$
static int filecount=0; uGMzU&+
CString name; +M0pmK!
name.Format("pict%04d.bmp",filecount++); c a_mift
name=m_Path+name; "CJ~BJI%
BITMAPFILEHEADER bfh; _Hv+2E[4Z
bfh.bfReserved1=bfh.bfReserved2=0; PR.3EL
bfh.bfType=((WORD)('M'<< 8)|'B'); ,*XB11P
bfh.bfSize=54+size; v.-DXQq
bfh.bfOffBits=54; >>P5 4|&
CFile bf; <u!cdYo@
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Ds">eNq
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kP
]Up&'
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \sAaVdZJH(
bf.WriteHuge(lpData,size); 'ztOl`I5V
bf.Close(); Qu61$!
nCount++; nnv|GnQST
} q*3OWr
GlobalFreePtr(lpData); ?uq`| 1`
if(nCount==1) z$%twBg}#
m_Number.Format("%d picture captured.",nCount); 13X}pnW
else 7y'uZAF
m_Number.Format("%d pictures captured.",nCount); ^<CVQ8R7
UpdateData(FALSE); +lx&$mr?
} 2|je{
A`Z/B[)
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M/?,Qii
{ c
C3>Ff'
if(pMsg -> message == WM_KEYDOWN) l*1|B3#m!
{ e3p|g]
if(pMsg -> wParam == VK_ESCAPE) |"gL{De
return TRUE; y@3p5o9lv-
if(pMsg -> wParam == VK_RETURN) t%lat./yT
return TRUE; rm[C{Pn
} >$4#G)s
return CDialog::PreTranslateMessage(pMsg); $d?W1D<A
} G\@pg;0|y
ljKIxSvCFp
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +X=*>^G(-
{ Y,}_LS$f
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Jl/w P
SaveBmp(); WoEK #,I;
return FALSE; nq M7Is
} p~$cwbQ!
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O(T5
CMenu pop; $H)^o!
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4@PA+(kvS
CMenu*pMenu=pop.GetSubMenu(0); Xqf,_I=V
pMenu->SetDefaultItem(ID_EXITICON); |THpkfW
CPoint pt; :o'x?]
GetCursorPos(&pt); o!M8V ^vW
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4Z)s8sD KW
if(id==ID_EXITICON) ~bLx2=-"
DeleteIcon(); \R#SoOd
else if(id==ID_EXIT) )'djqpM.
OnCancel(); \vA*dQ-
return FALSE; hYW9a`Ht/
} }| DspO
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1t
R^
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !"L.g u-'
AddIcon(); m{/7)2.
return res; C-&ymJC|
} R
BYhU55B
|6E_N5~
void CCaptureDlg::AddIcon() }Pcm'o_wT
{ Og\k5.! ,
NOTIFYICONDATA data; 9bM\ (s/
data.cbSize=sizeof(NOTIFYICONDATA); <Riz!(G
CString tip; Ir9GgB
tip.LoadString(IDS_ICONTIP); Met]|&
data.hIcon=GetIcon(0); F$7!j$
Z
data.hWnd=GetSafeHwnd(); _'=,c"
strcpy(data.szTip,tip); 40t xZFQ0
data.uCallbackMessage=IDM_SHELL; (\AN0_
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; --5F*a{R|
data.uID=98; [l23b{
Shell_NotifyIcon(NIM_ADD,&data); q(KjhM
ShowWindow(SW_HIDE); g>lZs
bTray=TRUE; ]S6Gz/4aV+
} ?KC(WaGJQ
nKx)R^]k
void CCaptureDlg::DeleteIcon() Tuln#<:
{ [9; @1I<x
NOTIFYICONDATA data; UqP{Cyy{
data.cbSize=sizeof(NOTIFYICONDATA); ]\(8d[4
data.hWnd=GetSafeHwnd(); s4|\cY`b-
data.uID=98; 7r:h_r-
Shell_NotifyIcon(NIM_DELETE,&data); '~[8>Q>
ShowWindow(SW_SHOW); 5J5?cs-!
SetForegroundWindow(); w#"\*SKK
ShowWindow(SW_SHOWNORMAL); ^tB1Nu%
bTray=FALSE; #Bd]M#J17a
} bZnOX*y]
5hrI#fpOR
void CCaptureDlg::OnChange() H"A%mrb
{ >e;-$$e
RegisterHotkey(); qRt! kWW
} +?_!8N8
>US*7m }
BOOL CCaptureDlg::RegisterHotkey() $L/`nd
{ :{7+[LcH7
UpdateData(); /R#zu_i
UCHAR mask=0; ">H*InF
UCHAR key=0; {9x_E {
if(m_bControl) 28MMH
Q
mask|=4; &2tfj(ms
if(m_bAlt) TKDG+`TyZ
mask|=2; 7N$2N!I(
if(m_bShift) \-\>JPO~<
mask|=1; B~Sj#(WEa
key=Key_Table[m_Key.GetCurSel()]; &LLU@ |
if(bRegistered){ &uq.k{<p\
DeleteHotkey(GetSafeHwnd(),cKey,cMask); &K^0PzWWof
bRegistered=FALSE; UC!mp?
} tB_le>rhl
cMask=mask; ai!u+L
cKey=key; 384n1?
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); feej'l }F
return bRegistered; t>j_C{X1(
} f}:C~L!
a'J0}j!
四、小结 +-izC%G
LF dvz0
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。