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:
nSUQ Eho<
<*O~?=6p 一、实现方法
cO}`PD$i a
W1y0 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
HHd;<% q 9a4Xf%!F>z #pragma data_seg("shareddata")
rmVF88/; HHOOK hHook =NULL; //钩子句柄
GI:J9TS UINT nHookCount =0; //挂接的程序数目
H<6TN^ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
M3>c?,O)J static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
K7o!,['W static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
)L^GGy8w static int KeyCount =0;
3eOwy~ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
NFDh!HUm #pragma data_seg()
RE*;_DF ?"23X Ke 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
vd0;33$L %OS}BAh^i 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:
i{1SUx+Re 4rpx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ji'NR cKey,UCHAR cMask)
Q:U^):~ {
?f}lYQzM BOOL bAdded=FALSE;
iv3=J
for(int index=0;index<MAX_KEY;index++){
^o;f~6#17 if(hCallWnd[index]==0){
h?cf)L hCallWnd[index]=hWnd;
(~}P.?C8 HotKey[index]=cKey;
WX2:c,%: HotKeyMask[index]=cMask;
/E(319u_ bAdded=TRUE;
#2&DDy)Bf KeyCount++;
SEf:u break;
j%7N\Vb }
(f Gmjx }
oRJ!J-Z] return bAdded;
m6'VMW }
vUlGE //删除热键
v$H=~m BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@jXdQY%{ {
nu'r` BOOL bRemoved=FALSE;
dCbRlW for(int index=0;index<MAX_KEY;index++){
:[hZn/ if(hCallWnd[index]==hWnd){
&Nzq/~uqP if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{xW HKsI>, hCallWnd[index]=NULL;
rGNYu\\ HotKey[index]=0;
H]^hEQ3DT HotKeyMask[index]=0;
Q~p)@[q bRemoved=TRUE;
huPAWlxT KeyCount--;
A>C&`A=- break;
H>zX8qP+ }
](^$5Am }
p }p@])}8 }
mgODJ return bRemoved;
FabDK : }
>
T$M0&< 8ClOd<I j@7%% DLL中的钩子函数如下:
MKl`9 Y3Ge {~L{FG)O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
6"OwrJB {
[9hslk BOOL bProcessed=FALSE;
O_gr{L} if(HC_ACTION==nCode)
qdss(LZ {
5mtsN# if((lParam&0xc0000000)==0xc0000000){// 有键松开
:NHP," switch(wParam)
6}(;~/L {
L6>;"]:f` case VK_MENU:
*h <_gn MaskBits&=~ALTBIT;
Fl{@B*3@w break;
~g#$'dS case VK_CONTROL:
:!'!V>#g MaskBits&=~CTRLBIT;
[WfigqY`b* break;
-@I+IKz case VK_SHIFT:
Q+i MaskBits&=~SHIFTBIT;
4G o$OQ` break;
ls;!Og9 default: //judge the key and send message
)\`.Ru~, break;
iJ-z&=dOe }
NZ|(#` X for(int index=0;index<MAX_KEY;index++){
t)p . $ if(hCallWnd[index]==NULL)
6I<^wS9j_ continue;
XABB6J] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{E 'go] {
=ws iC' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6_&uYA<8pE bProcessed=TRUE;
p%ve1>c }
dE_d.[! }
w%3*T#tp }
8@)4)+e else if((lParam&0xc000ffff)==1){ //有键按下
B$\,l.hE switch(wParam)
?q*,,+'0 {
i".nnAI: case VK_MENU:
5#WyI#YNG MaskBits|=ALTBIT;
KUE}^/%z break;
#Wf9` case VK_CONTROL:
X2PyFe MaskBits|=CTRLBIT;
K/;*.u`: break;
'(6
^O= case VK_SHIFT:
*LZB.84 MaskBits|=SHIFTBIT;
Dt ~3Qd0 break;
I{8sLzA03S default: //judge the key and send message
pm4'2B|)g break;
LQo>wl }
=[
+)T[ for(int index=0;index<MAX_KEY;index++){
W,D$=Bg if(hCallWnd[index]==NULL)
c %f'rj continue;
N E/ _ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yu.N> [= {
tK0Ksnl^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
\'>8 (i~ bProcessed=TRUE;
Py!
F }
&Sr7?u`k }
TIIwq H+h. }
NDo>"in if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
P.t0o~hoK; for(int index=0;index<MAX_KEY;index++){
;,2;J3,pA if(hCallWnd[index]==NULL)
QcN$TxU > continue;
jTh^#Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
aj|gt SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
vw'BKi
F //lParam的意义可看MSDN中WM_KEYDOWN部分
tB<2mjg }
?3t]9z }
?AlTQL~c }
TNj WZ return CallNextHookEx( hHook, nCode, wParam, lParam );
~]l
T>|X }
FG{45/0We 1=^edQ+ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
:dML+R#Ymh ][[\!og BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
CW .
O"_ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
|WUm;o4E`U Y )](jU%o 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
xU(yc}vw, *D:"I!Ho LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Pf?zszvs {
J69B1Yi if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
6d#:v"^, {
dp=#|!jc //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
,>vI|p,/G* SaveBmp();
8EC$p} S return FALSE;
t)n}S;iD }
Rct=vDU …… //其它处理及默认处理
H]a@"gO }
Uoqt dl; O~L/>Ya 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。
p J#<e j%TcW!D-_ 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。
7TaHE
OO /Pc 二、编程步骤
8r-'m%l W9A
[Z 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";
TQiDbgFo o?]g 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
1XD|H_JG<j W%&'EJ)62 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;
t^KoqJ 'du{ky 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;
P+s-{vv{0 r[votdFo 5、 添加代码,编译运行程序。
=c1t]%P, hrZ=8SrW 三、程序代码
Qf<@
:T* P{{U ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
=j$!N# L #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
{I"`( #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Q?7:XbN #if _MSC_VER > 1000
O%R*1
P9 #pragma once
|v?*}6:a #endif // _MSC_VER > 1000
"JBTsQDj! #ifndef __AFXWIN_H__
dLnu\bSF #error include 'stdafx.h' before including this file for PCH
yG%<LP2p@f #endif
l;'#!hC) #include "resource.h" // main symbols
TexSUtx@$ class CHookApp : public CWinApp
dXvp-oi {
n>[" h2 public:
*
U#@M3g. CHookApp();
d(> // Overrides
g XThdNU4G // ClassWizard generated virtual function overrides
Ei&
Z //{{AFX_VIRTUAL(CHookApp)
\Tii
S public:
w\f>.N virtual BOOL InitInstance();
#Emz9qTsce virtual int ExitInstance();
++ZtL\h{7 //}}AFX_VIRTUAL
Wgr`)D //{{AFX_MSG(CHookApp)
mE+ // NOTE - the ClassWizard will add and remove member functions here.
]Y%U5\$ // DO NOT EDIT what you see in these blocks of generated code !
$,v[<T` //}}AFX_MSG
H;(|&Asq> DECLARE_MESSAGE_MAP()
"2FI3M= };
e9e7_QG_- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
ZZJXd+Q} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v?S~ =$. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
erQ0fW BOOL InitHotkey();
K,o@~fj BOOL UnInit();
zEu15!~ #endif
\XI9 +::% 8fI&-uP{g //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
k=o>DaEh( #include "stdafx.h"
SSh=r #include "hook.h"
?*ni5\y5o #include <windowsx.h>
K0bh;I #ifdef _DEBUG
y!;PBsU%Sx #define new DEBUG_NEW
5|^{t00T~ #undef THIS_FILE
$*Z Zh static char THIS_FILE[] = __FILE__;
*[MK{m #endif
>*"6zR2 o #define MAX_KEY 100
tEE1`10Mt #define CTRLBIT 0x04
|>2IgTh1a #define ALTBIT 0x02
NcVsQV #define SHIFTBIT 0x01
$4j$c|S! #pragma data_seg("shareddata")
z%pD3J?> HHOOK hHook =NULL;
9*lkx# UINT nHookCount =0;
~.,h12 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
:1O1I2L0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
QV@NA@;XZ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
V&>\U?q: static int KeyCount =0;
ZJ7<!?6 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
,@b7N[h #pragma data_seg()
49("$! HINSTANCE hins;
n!*uv~%$ void VerifyWindow();
8%;K#,> BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
53w@ //{{AFX_MSG_MAP(CHookApp)
uKBSv*AM // NOTE - the ClassWizard will add and remove mapping macros here.
+[sZE
X // DO NOT EDIT what you see in these blocks of generated code!
1>!wm0;x //}}AFX_MSG_MAP
7wU$P END_MESSAGE_MAP()
q:9#Vcw (^ Q:zU CHookApp::CHookApp()
tKik)ei {
>nnjLrI // TODO: add construction code here,
xq2
,S // Place all significant initialization in InitInstance
K[XFJ 9 }
Q6|~ks+Y (Wm4JmX% CHookApp theApp;
g+-=/Ge LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
d5x>kO'[l {
D3>;X= 1 BOOL bProcessed=FALSE;
WLTraB[? if(HC_ACTION==nCode)
71h?t`N {
[AZN a if((lParam&0xc0000000)==0xc0000000){// Key up
bS9<LQ* switch(wParam)
H$/r{gfg^ {
<$\En[u0 case VK_MENU:
+cw;a]o^> MaskBits&=~ALTBIT;
_(q|W3 break;
SgOn:xg;3L case VK_CONTROL:
MR/8 MaskBits&=~CTRLBIT;
bLfbzkNV\1 break;
dUTF0U case VK_SHIFT:
`Xbk2KD p MaskBits&=~SHIFTBIT;
(v\Cv)OS break;
'~1uJ0H default: //judge the key and send message
:V%XEN) break;
=HF||p@ }
CS:mO| for(int index=0;index<MAX_KEY;index++){
_l`s}yC if(hCallWnd[index]==NULL)
r# }`{C;+5 continue;
H@uCbT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f&\v+'[p {
l1RpG" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9*@K l`\ bProcessed=TRUE;
ml|[xM8 }
' Vp6=,P }
0$n0fu }
X:*Ut3" else if((lParam&0xc000ffff)==1){ //Key down
6[h3pb/m switch(wParam)
mxYsP6& {
=Of!1TR( case VK_MENU:
M.Fu>Xi MaskBits|=ALTBIT;
*CA7
{2CX break;
FZM9aA case VK_CONTROL:
{I!sXj MaskBits|=CTRLBIT;
v@43%`"Gj break;
fR>(b?C case VK_SHIFT:
ys5b34JN MaskBits|=SHIFTBIT;
Z7eD+4gD break;
k-LB %\p default: //judge the key and send message
{e4ILdXM break;
*{]9e\DF }
EV:y} for(int index=0;index<MAX_KEY;index++)
G_wzUk=L {
*3hqz<p4: if(hCallWnd[index]==NULL)
3
;F=EMz{ continue;
kq[*q-:"x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<}c`jN!z. {
t(4%l4i;X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Z#wmEc.}C bProcessed=TRUE;
$vS`w4Y }
$18|@\Znj }
^X%{]b K }
XD5z+/F<"0 if(!bProcessed){
t@Qs&DZ7k for(int index=0;index<MAX_KEY;index++){
(;o,t?:d if(hCallWnd[index]==NULL)
Ix,`lFbH continue;
mAk@Q|u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
':71;^zXf SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
djeax }
&~+lXNXF }
*`:zSnu }
nn@"68]g return CallNextHookEx( hHook, nCode, wParam, lParam );
5$Yt@8; }
cvpcadN[ VJM n5v[V BOOL InitHotkey()
I=VPw5"E {
W@w#A] if(hHook!=NULL){
K9FtFd nHookCount++;
FO{K=9O return TRUE;
tI&Z!fj }
8>Hnv]p else
3F ;+D hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
NZ`( d if(hHook!=NULL)
}d2]QD#O nHookCount++;
w!7f* return (hHook!=NULL);
3tMFJ ;*` }
F/[vg BOOL UnInit()
o$>A;< {
NZ/>nNs if(nHookCount>1){
DCv~^ nHookCount--;
D+/27# return TRUE;
6elmLDMni\ }
NAjK0]SRY BOOL unhooked = UnhookWindowsHookEx(hHook);
`Td 0R! if(unhooked==TRUE){
2{zFO3i<3 nHookCount=0;
v;X'4/M hHook=NULL;
vV:eU-a }
08&DP^NS return unhooked;
T_:"~
] }
%ci/(wL bZk7)b;1o BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-.:[a3c? {
;2
oR?COW BOOL bAdded=FALSE;
+1Oi-$
2- for(int index=0;index<MAX_KEY;index++){
m/sAYF" if(hCallWnd[index]==0){
/GNLZm^ hCallWnd[index]=hWnd;
L2[|g~ HotKey[index]=cKey;
*upl*zFf0 HotKeyMask[index]=cMask;
5An|#^] bAdded=TRUE;
~HsPYc8Fz KeyCount++;
MNNPBE break;
? &ew$% }
U@dztX@u }
uYAPGs#k return bAdded;
Q*mzfsgr }
.WA(X5 ZKyK#\v< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
=jjUwcl {
Tm@d;O'E1 BOOL bRemoved=FALSE;
w@7NoD= for(int index=0;index<MAX_KEY;index++){
SLO;c{EFH if(hCallWnd[index]==hWnd){
k.>*!l0 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
A.m#wY8 hCallWnd[index]=NULL;
E~]8>U?V HotKey[index]=0;
%B`MO- HotKeyMask[index]=0;
"BZ6G` bRemoved=TRUE;
?V%x94B KeyCount--;
S P)$K= break;
/|Za[ }
9VdVom|e }
nC^?6il
}
K~OfC return bRemoved;
g,U~3# }
R| t"(6 mV0F^5 void VerifyWindow()
6*Jd8Bva\o {
^ Afq)26D for(int i=0;i<MAX_KEY;i++){
a(s}Ec${Z if(hCallWnd
!=NULL){ _|rrl
if(!IsWindow(hCallWnd)){ H[ocIw
hCallWnd=NULL; EAp6IhW{
HotKey=0; I{AteL
HotKeyMask=0; QN:gSS{30
KeyCount--; 1tU}}l
} 'h_PJ%
} Urur/_]-%
} 7$'%*|C.
} [TvH7ott'1
gP1~N^hke]
BOOL CHookApp::InitInstance() 'CsD[<
{ <@ D`16%&
AFX_MANAGE_STATE(AfxGetStaticModuleState()); _ In[Z?P}
hins=AfxGetInstanceHandle(); (-DA%
InitHotkey(); 12v5*G[X
return CWinApp::InitInstance(); He="S3XON
} a@Tn_yX
-Czq[n=0(
int CHookApp::ExitInstance() R X:wt
{ s`M[/i3Nm
VerifyWindow(); IO~d.Ra
UnInit(); Rq~\Yf+Pm
return CWinApp::ExitInstance(); =cE:,z;g
} -q\5)nY
5OP$n]|(
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !/, 6+2Ru
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @gc lks/M
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rXXIpQRi$S
#if _MSC_VER > 1000 |&+g ,A _w
#pragma once S]iMZ \I/
#endif // _MSC_VER > 1000 lob{{AB,!
DG}YQr.L
class CCaptureDlg : public CDialog 3>qUYxG8
{ ;xaOve;9
// Construction Vc|r(lM
public: de]r9$D
BOOL bTray; 4&;.>{:;
BOOL bRegistered; ~Fv&z'R
BOOL RegisterHotkey(); b{qeu$G R
UCHAR cKey; |4//%Ll/
UCHAR cMask; %:oyHlz%
void DeleteIcon(); 0 ;kcSz
void AddIcon(); n~N>c*p
UINT nCount; c(Zar&z,E
void SaveBmp(); 0mo^I==J1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor {bnNY
// Dialog Data Vzf{gr?
//{{AFX_DATA(CCaptureDlg) CZyOAoc<
enum { IDD = IDD_CAPTURE_DIALOG }; flp<QT
CComboBox m_Key; CL%?K<um
BOOL m_bControl; aCzdYv\} &
BOOL m_bAlt; :UMg5eZ
BOOL m_bShift; T677d.zaT
CString m_Path; ^p(t*%LM
CString m_Number; ]X~;?>#:p
//}}AFX_DATA ~8~B VwZ_
// ClassWizard generated virtual function overrides 2/S~l;x
//{{AFX_VIRTUAL(CCaptureDlg) d&'z0]mOe
public: %J4]T35^2
virtual BOOL PreTranslateMessage(MSG* pMsg); <Ur(< WTV
protected: xExy?5H7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <e"O`*ZJ
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %
INRds
//}}AFX_VIRTUAL FSv')`}
// Implementation Bmuf[-}QW
protected: /=Bz[O
HICON m_hIcon;
@>f]0,"(
// Generated message map functions M$g%kqa
//{{AFX_MSG(CCaptureDlg) :/fG %e
virtual BOOL OnInitDialog(); 5zG6V2
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?l#9ydi?
afx_msg void OnPaint(); Pm; /Ua
afx_msg HCURSOR OnQueryDragIcon(); ZxkX\gl91
virtual void OnCancel(); j-|YE?AA
afx_msg void OnAbout(); >kOc a
afx_msg void OnBrowse(); r4caIV
afx_msg void OnChange(); F^bC!;~x
//}}AFX_MSG -'+|r]
DECLARE_MESSAGE_MAP() `HU`=a&d
}; jQ.]m
#endif G3&ES3L
8=ubMqr[
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file p.i$[6M
#include "stdafx.h" i.2O~30ST
#include "Capture.h" ?^P#P0
#include "CaptureDlg.h" 0(#HMBE8
#include <windowsx.h> eU_|.2
#pragma comment(lib,"hook.lib") +(3"XYh
#ifdef _DEBUG Nk=F.fp|/
#define new DEBUG_NEW Y9~;6fg
#undef THIS_FILE d_#\^!9
static char THIS_FILE[] = __FILE__; g6EdCG.V
#endif P$_Y:XI !
#define IDM_SHELL WM_USER+1 8,2l >S
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ="
K;3a`GI
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9oS \{[x.
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8yax.N
j
class CAboutDlg : public CDialog :xZ/c\
{ f]"][!e!,
public: >bxT_qEm
CAboutDlg(); ==(9P`\
// Dialog Data 5)V]qV$
//{{AFX_DATA(CAboutDlg) ZmO/6_nU?
enum { IDD = IDD_ABOUTBOX }; _dppUUm
//}}AFX_DATA ;5#P?
// ClassWizard generated virtual function overrides /tA$'tZ
//{{AFX_VIRTUAL(CAboutDlg) o1"U'y-9V
protected: @I}:HiF
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Vi`+2%4
//}}AFX_VIRTUAL !JUXq
// Implementation TveCy &
protected: H7G*Vg
//{{AFX_MSG(CAboutDlg) aAO[Y"-:,Y
//}}AFX_MSG 1iaNb[:QX
DECLARE_MESSAGE_MAP() 1JgnuBX"
}; 7M}T^LC
^te9f%>$l
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l3n* b6
{ ~ $#DB@b
//{{AFX_DATA_INIT(CAboutDlg) srx`"
:
//}}AFX_DATA_INIT "m})~va
} }r`!p5\$K0
)vOZp&
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1Y@6oT
{ jD0^,aiG
CDialog::DoDataExchange(pDX); :Y
y+%
//{{AFX_DATA_MAP(CAboutDlg) $y\'j5nk3
//}}AFX_DATA_MAP kxoJL6IC
} !l~tBJr*sB
8gJ"7,}-'
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IvetQ+
//{{AFX_MSG_MAP(CAboutDlg) jnt0,y A
// No message handlers *La*j3|:
//}}AFX_MSG_MAP /4RKA!W
END_MESSAGE_MAP() Kr=DoQ."d8
dTyTj|"x{
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u%a2"G|
: CDialog(CCaptureDlg::IDD, pParent) ]jG%<j9A
{ .qy._C2(
//{{AFX_DATA_INIT(CCaptureDlg) $J[h(>-X
m_bControl = FALSE; 4u X<sJ*
m_bAlt = FALSE; p}uL%:Vr
m_bShift = FALSE; Slq=;TDp
m_Path = _T("c:\\"); {i~qm4+o
m_Number = _T("0 picture captured."); ho#]?Z#
nCount=0; CY)Wuv ^
bRegistered=FALSE; :~:(49l
bTray=FALSE; !#3#}R.$Fl
//}}AFX_DATA_INIT KmZUDU%R
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nfy"M),et
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =/.[&DG
} [sFD-2y
gO<>L0,j
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "pdG%$
{ E~2}rK+#)
CDialog::DoDataExchange(pDX); -#3B>VY
//{{AFX_DATA_MAP(CCaptureDlg) /QHvwaW[
DDX_Control(pDX, IDC_KEY, m_Key); Y!i4P#4+q
DDX_Check(pDX, IDC_CONTROL, m_bControl);
?.|qRzWL
DDX_Check(pDX, IDC_ALT, m_bAlt); $"J+3mO
DDX_Check(pDX, IDC_SHIFT, m_bShift); Mh>^~;
DDX_Text(pDX, IDC_PATH, m_Path); T$GhE
DDX_Text(pDX, IDC_NUMBER, m_Number); RJnRbaC
//}}AFX_DATA_MAP @luv;X^%
} ;.!AX|v
e_g7E+6
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0Vh|UJ'&7
//{{AFX_MSG_MAP(CCaptureDlg) HkJ$r<J2
ON_WM_SYSCOMMAND() pb$U~TvzhM
ON_WM_PAINT() s~]Ri:7~
ON_WM_QUERYDRAGICON() _R]la&^2F\
ON_BN_CLICKED(ID_ABOUT, OnAbout) Z?G-~3]e
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1`5d~>fV
ON_BN_CLICKED(ID_CHANGE, OnChange) KSqWq:W+
//}}AFX_MSG_MAP /JtKn*?}:>
END_MESSAGE_MAP() _4owxYSDke
F_zs"ex/
BOOL CCaptureDlg::OnInitDialog() fph*|T&R
{ |6"zIHvtc
CDialog::OnInitDialog(); 4tCyd5u a8
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mxq'A
ASSERT(IDM_ABOUTBOX < 0xF000); E>KV1P
CMenu* pSysMenu = GetSystemMenu(FALSE); -"\z|OQ
if (pSysMenu != NULL) '2/48j X5
{ fi:Z*-
CString strAboutMenu; (3%NudkwT
strAboutMenu.LoadString(IDS_ABOUTBOX); #J, `a.
if (!strAboutMenu.IsEmpty()) )<1M'2
{ 'd|_ i6:y&
pSysMenu->AppendMenu(MF_SEPARATOR); 2y,NT|jp
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +<Uc42i7n
} Pd%o6~_*
} ?%iAkV
SetIcon(m_hIcon, TRUE); // Set big icon %S]5wR6;_
SetIcon(m_hIcon, FALSE); // Set small icon ?X]7jH<iw;
m_Key.SetCurSel(0); gUy >I(
RegisterHotkey(); o\g",O4-
CMenu* pMenu=GetSystemMenu(FALSE); Tr(w~et
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *'QD!Tc
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !HY+6!hk
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Qi w "x,
return TRUE; // return TRUE unless you set the focus to a control 7 H.2]X
} D5]T.8kX(7
Nf}G
"!
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [wjA8d.
{ n>+M4Zb
if ((nID & 0xFFF0) == IDM_ABOUTBOX) {&4+W=0
n
{ ZvkO#j
CAboutDlg dlgAbout; e#0R9+"Ba
dlgAbout.DoModal(); W.HM!HQp
} mG1=8{o^
else cIw)ScY
{ MJt?^G (w?
CDialog::OnSysCommand(nID, lParam); W-<C%9O!
} =xw) [
} K`M 8[ %S
"/(J*)%{
void CCaptureDlg::OnPaint() ]pzf{8%
{ }<[@)g.h.
if (IsIconic()) :;#^h]Q
{ dK#:io[Nz
CPaintDC dc(this); // device context for painting nkG1&wiX
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E"b+Q
// Center icon in client rectangle {<v?Z_!68
int cxIcon = GetSystemMetrics(SM_CXICON); 'Wn'BRXq3
int cyIcon = GetSystemMetrics(SM_CYICON); cE$<6&0
CRect rect; !.?2zp~
GetClientRect(&rect); :Z- =1b~
int x = (rect.Width() - cxIcon + 1) / 2; 2!QJa=
int y = (rect.Height() - cyIcon + 1) / 2; %|I~8>m
// Draw the icon &_x:+{06
dc.DrawIcon(x, y, m_hIcon); Ovq-rI{
} T[`o$j6
else MXh0 a@*]
{ 7YV}F9h4
CDialog::OnPaint(); F
*=>=
} `1=n H/E
} pV9$Vg?-H
[d`J2^z}
HCURSOR CCaptureDlg::OnQueryDragIcon() ': 87.8$
{ \xlelsmB*
return (HCURSOR) m_hIcon; *?zmo@-
} %c<e`P;
C*a>B,H
void CCaptureDlg::OnCancel() c$Z3P%aP'V
{ 1Mn=m w
if(bTray) &xo_93
DeleteIcon(); --6C>iY[&u
CDialog::OnCancel(); >gRb.-{ux
} y'((
tBWa!
><V<}&:y$(
void CCaptureDlg::OnAbout() l+HmG< P
{ F0t-b %w,
CAboutDlg dlg; Za_w@o
dlg.DoModal();
e{EKM4
} Q'5]E{1<'n
lD)ZMaaS3
void CCaptureDlg::OnBrowse() Sg
{ "4NcszEN
CString str; {e~#6.$:
BROWSEINFO bi; X
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char name[MAX_PATH]; lHerEv<ja
ZeroMemory(&bi,sizeof(BROWSEINFO)); 'i+j;.
bi.hwndOwner=GetSafeHwnd(); q4=Gj`\43
bi.pszDisplayName=name; `yJ3"{uO
bi.lpszTitle="Select folder"; !0!m |^c5
bi.ulFlags=BIF_RETURNONLYFSDIRS; WVyk?SBw
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]s_,;PG U
if(idl==NULL) 2T 3tKX
return; ;}1O\nngR
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); opsjei@
str.ReleaseBuffer(); Y\75cfD
m_Path=str; "`g5iUHqUl
if(str.GetAt(str.GetLength()-1)!='\\') u#!QIQW
m_Path+="\\"; ^x2zMB\t
UpdateData(FALSE); 41G}d+
} WN#S%G:Q)
qJ(XW N H
void CCaptureDlg::SaveBmp() .JCd:'-
{ K Q^CiX
CDC dc; USd7gOq(
dc.CreateDC("DISPLAY",NULL,NULL,NULL); f|f)Kys%5
CBitmap bm; Qe4O N3X!
int Width=GetSystemMetrics(SM_CXSCREEN); M/?eDW/
int Height=GetSystemMetrics(SM_CYSCREEN); CCDU5l$$
bm.CreateCompatibleBitmap(&dc,Width,Height); 7<GC{/^T
CDC tdc; &A}hx\_T
tdc.CreateCompatibleDC(&dc); ~(*2:9*0
CBitmap*pOld=tdc.SelectObject(&bm); DwmK?5 p
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); qofD@\-
tdc.SelectObject(pOld); q"(b}3
BITMAP btm; bT>MZK8b
bm.GetBitmap(&btm); FD'yT8]"
DWORD size=btm.bmWidthBytes*btm.bmHeight; ?_ 476A
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !,lk>j.V
BITMAPINFOHEADER bih; A(eB\qG
bih.biBitCount=btm.bmBitsPixel; jQBL8<
bih.biClrImportant=0; Zzn
N"Si,
bih.biClrUsed=0; %(&$CmS@
bih.biCompression=0; OEw#;l4 C
bih.biHeight=btm.bmHeight; @*Tql:Qcd^
bih.biPlanes=1; [s4|+
bih.biSize=sizeof(BITMAPINFOHEADER); HK
NT. a
bih.biSizeImage=size; e&nE
bih.biWidth=btm.bmWidth; xO[V>Ud
bih.biXPelsPerMeter=0; {x{~%)-
bih.biYPelsPerMeter=0; @U+#@6
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3D;?X@
static int filecount=0; PctXh, =
CString name; HmiG%1+{A
name.Format("pict%04d.bmp",filecount++); s
Poh\n
name=m_Path+name; \&_pI2X
BITMAPFILEHEADER bfh; \VpN:RI
bfh.bfReserved1=bfh.bfReserved2=0; EDT9O
bfh.bfType=((WORD)('M'<< 8)|'B'); Ptm=c6H('
bfh.bfSize=54+size; j*\oK@
bfh.bfOffBits=54; j"hNkCF
CFile bf; gLm,;'h%u
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $J8g)cS
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); A(_HMqA]
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); OxQ 5P;O
bf.WriteHuge(lpData,size); %nRgHN>
bf.Close(); d.|*sZ&3p
nCount++; 9(3]t}J5
d
} 4VF4 8
GlobalFreePtr(lpData); h0R.c|g[
if(nCount==1) D V\7KKJE
m_Number.Format("%d picture captured.",nCount); G2<$to~{
else :.9Y
m_Number.Format("%d pictures captured.",nCount); E.%V0}
UpdateData(FALSE); Y'{}L@"t
} yg.o?eML
+e^CL#Gs
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $K.DLqDt
{ +BeA4d8b
if(pMsg -> message == WM_KEYDOWN) &gJ1*"$9
{ %~I&T".iC
if(pMsg -> wParam == VK_ESCAPE) LC4VlfU
return TRUE; (gnN</%
if(pMsg -> wParam == VK_RETURN) mPU}]1*p
return TRUE; n}b{u@$
} +`bnQn]x+
return CDialog::PreTranslateMessage(pMsg); lz!(OO,g
} JH| D
zMRa<G7
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p5jR;nOZ%l
{ ,4S[<(T"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Siq]Ii0F;>
SaveBmp(); Nyt*mbd5
{
return FALSE; Qo:vAv
} MJh.)kd$
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O1UArD
CMenu pop; d5NE:%K
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [(2^oTSRaq
CMenu*pMenu=pop.GetSubMenu(0); T$`m!mQ4
pMenu->SetDefaultItem(ID_EXITICON); 2 431v@
CPoint pt; 'z^'+}iyv
GetCursorPos(&pt); A@Q6}ESD
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]isq}Qv~
if(id==ID_EXITICON) !uit
DeleteIcon(); )H @<A93
else if(id==ID_EXIT) 'Kk/
J+6U
OnCancel(); GMg!2CIU
return FALSE; 9i U/[d
} Rz&`L8Bz
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3b\s;!
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) etT9}RbQ
AddIcon(); Q>\Ho'
return res; H#7=s{u
} Gk+R,:
*=O]^|]2
void CCaptureDlg::AddIcon() L){V(*K '
{ =xDxX#3
NOTIFYICONDATA data; \#JXch
data.cbSize=sizeof(NOTIFYICONDATA); VQ,5&-9Y3
CString tip; I{0cnq/
tip.LoadString(IDS_ICONTIP); q6N{N>-D
data.hIcon=GetIcon(0); z6 }p4
data.hWnd=GetSafeHwnd(); ZB|s/
strcpy(data.szTip,tip); w_o+;B|I
data.uCallbackMessage=IDM_SHELL; rHjDf[5+
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P>u2""c
data.uID=98; Uj\t04
Shell_NotifyIcon(NIM_ADD,&data); Kp*3:XK
ShowWindow(SW_HIDE); 2+I5VPf
bTray=TRUE; &OZx!G^Z
} RhKDQGdd
MM]0}65KG
void CCaptureDlg::DeleteIcon() %TR J
{ )b (+=
NOTIFYICONDATA data; `q\F C[W
data.cbSize=sizeof(NOTIFYICONDATA); ks sRwe%>;
data.hWnd=GetSafeHwnd(); iDX<`)
data.uID=98; n|? sNM<J3
Shell_NotifyIcon(NIM_DELETE,&data); \a7m!v
ShowWindow(SW_SHOW);
E.;Hm;
SetForegroundWindow(); &>+5
8
ShowWindow(SW_SHOWNORMAL); Ym"^Ds}
bTray=FALSE; $[b}r#P
} Xs|d#WbX
n 7B2rRJH
void CCaptureDlg::OnChange() @`+\vmfD
{ [kpQ:'P3
RegisterHotkey(); 4YI6&
}
#tpz74O
\1&4wzT
BOOL CCaptureDlg::RegisterHotkey() gx^_bHh
{ ZvQZD=,F
UpdateData(); bf=\ED ^
UCHAR mask=0; N.+A-[7,W
UCHAR key=0; o3\^9-jmp
if(m_bControl) KztQT9kY
mask|=4; +w(6#R8u5
if(m_bAlt) nC
!NZ
mask|=2; Mv/ SU">F
if(m_bShift) \2[tM/+Bs
mask|=1; p5OoDo
key=Key_Table[m_Key.GetCurSel()]; p<h(
if(bRegistered){ 'AWWdz
DeleteHotkey(GetSafeHwnd(),cKey,cMask); BMQ4i&kF|
bRegistered=FALSE; !gV{[j?~zr
} x5xMr.vm
cMask=mask; A-.Wd7^~*
cKey=key; 7O%^4D
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ~`Vo0Z*S
return bRegistered; ^8bc<c:P
} t~dK\>L
D3,)H%5.y
四、小结 \p}GW
js;YSg{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。