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:
?d3<GhzlR3
i}|jHlv 一、实现方法
?aB%h
|VA VGCd)&s 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:
&[PA?#I` E3CwA8)k #pragma data_seg("shareddata")
KNF{NFk HHOOK hHook =NULL; //钩子句柄
k0b6X5 UINT nHookCount =0; //挂接的程序数目
u<Ch]m+ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
&I{5f-o* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
"-IF_Hid static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
.%0a static int KeyCount =0;
64'sJc. static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
7^#O{QYol #pragma data_seg()
p gv, Su cxPO 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。
mgq4g RO[X#c 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:
0d0ga^O k
$# ,^)T BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
uE%2kB*] cKey,UCHAR cMask)
@aB7dtM {
"{bc2#F BOOL bAdded=FALSE;
nF,zWr[x for(int index=0;index<MAX_KEY;index++){
),%@X if(hCallWnd[index]==0){
\4fuC6d2 hCallWnd[index]=hWnd;
%_39Wa HotKey[index]=cKey;
i8*(J-M HotKeyMask[index]=cMask;
\2Q#' bAdded=TRUE;
B'PS-Jr KeyCount++;
T#H-GOY: break;
^%U`|GBZp }
+t]Ge
>S }
P+e {,~o return bAdded;
p7.~k1h }
wr>6Go% //删除热键
'OU3-K BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:$XlYJrjK {
@RdNAP_6 BOOL bRemoved=FALSE;
{"N:2 for(int index=0;index<MAX_KEY;index++){
j97K\]tQ if(hCallWnd[index]==hWnd){
.\
vrBf if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
K'K/}q< hCallWnd[index]=NULL;
je>mAQKi\ HotKey[index]=0;
G}]'}FUp HotKeyMask[index]=0;
QZL,zI]LL bRemoved=TRUE;
j0=H6Y KeyCount--;
9`&sZ|"3 break;
}n,LvA@[0 }
1:{+{Yl7 }
=[TXH^.0 }
+ =U9<8 return bRemoved;
,o3`O |PiK }
aCfWbJ@qiG ,s,AkH [_C([o'\KY DLL中的钩子函数如下:
Ubwmn!~ w[^lxq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
po*r14f {
A`I1G9s BOOL bProcessed=FALSE;
uy|]@|J if(HC_ACTION==nCode)
(3j f_ {
BY$L[U;@T if((lParam&0xc0000000)==0xc0000000){// 有键松开
Izfq`zS+\s switch(wParam)
O? 7hT!{ {
_~y-?(46K case VK_MENU:
tCj\U+; MaskBits&=~ALTBIT;
|uJjO>8]| break;
nbDjoZZ4 case VK_CONTROL:
!Okl3
!fC MaskBits&=~CTRLBIT;
ny<D1>{90 break;
M'NOM>8 case VK_SHIFT:
T!1XL7 MaskBits&=~SHIFTBIT;
1CUI6@Cz) break;
>GDf*
ox[ default: //judge the key and send message
vU#>3[aC break;
W7\UZPs5t }
*4Z! 5iOs for(int index=0;index<MAX_KEY;index++){
2Fbg"de3- if(hCallWnd[index]==NULL)
~KxK+6[ : continue;
0p*Oxsy if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w)>/fG|; {
$WQm"WAKe SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
FlbM(ofY bProcessed=TRUE;
e"Tr0k }
GCxmqoQ }
}AS3]Lub@ }
Bv7os3xb else if((lParam&0xc000ffff)==1){ //有键按下
bhW&,"$Z switch(wParam)
<^e {
OHH\sA case VK_MENU:
<CS,v)4,nH MaskBits|=ALTBIT;
YgQb(umK break;
y@ c[S; case VK_CONTROL:
{@ tO9pc`8 MaskBits|=CTRLBIT;
t+Qx-sW break;
qt.= case VK_SHIFT:
* YLpC^& MaskBits|=SHIFTBIT;
d(, M break;
cfc=a default: //judge the key and send message
"Q[?W(SA break;
;F/w&u.n }
}l5Q0' for(int index=0;index<MAX_KEY;index++){
87R$Y> V if(hCallWnd[index]==NULL)
=o[H2o
y continue;
ERfSJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X9YbTN {
;jmT5XzL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
bZgFea_>i bProcessed=TRUE;
`I(5Aj" }
l~x
6R~q }
E/C3t2@- }
A-u}&}l< if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
8?hj}}H for(int index=0;index<MAX_KEY;index++){
YG#{/;^nm) if(hCallWnd[index]==NULL)
cM=_i{c continue;
M1K[6V! if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=BeJ.8$@VC SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4B-+DH>{6 //lParam的意义可看MSDN中WM_KEYDOWN部分
Fw%S%*B8g }
CmtDfE }
[tJp^?6* }
6^z):d#u return CallNextHookEx( hHook, nCode, wParam, lParam );
xv_Z$&9e>l }
]ia{N 8@KGc
)k 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
\Bl`;uXb YcM0A~< BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
m3`J9f,c/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
y6>fK@K~ ~@D{&7@ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
#ahe@|E'Y z+j3j2 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
7C~g?1 {
4` :Eiik&p if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
#D%l;Ae {
n7bML?f' //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
"]yfx@)_ SaveBmp();
IG4`f~k^ return FALSE;
wkD"EuW( }
I:] Pd …… //其它处理及默认处理
hhJs$c( }
BHS8MV L@ rKr\Qy+q O?Qi 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"vL$h }`_x%]EJ 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。
F7`[r9 $ C=DC g 二、编程步骤
.s3y^1C D|/
4),v 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";
(5)DQ1LaF 9@YhAj 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
xepp."O SB^xq 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;
-K0!wrKC YvFt*t
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;
}J_#N.y #$u7:p
[t 5、 添加代码,编译运行程序。
^dKtUH/78G lR5k1J1n 三、程序代码
'CvV Ktk *YP;HL ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
H) q_9<; #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
uL=FK #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
k}e~xbh-y #if _MSC_VER > 1000
sE\Cv2Gx #pragma once
Tuy5h5 #endif // _MSC_VER > 1000
t0)XdIl8 #ifndef __AFXWIN_H__
{br6* #error include 'stdafx.h' before including this file for PCH
y2>AbrJ #endif
le~p2l#e #include "resource.h" // main symbols
17!<8vIV$C class CHookApp : public CWinApp
OsgjSJrf {
"E7YCZQR public:
A7zL\U4 CHookApp();
nZ#0L`@"Y // Overrides
1m<8M[6u // ClassWizard generated virtual function overrides
JQA]O/|N //{{AFX_VIRTUAL(CHookApp)
P u,JR public:
--F6n/> virtual BOOL InitInstance();
{A{sRT=% virtual int ExitInstance();
qyR}|<F8* //}}AFX_VIRTUAL
J|DY
/v //{{AFX_MSG(CHookApp)
_k Utj(re // NOTE - the ClassWizard will add and remove member functions here.
KKNQ+'? // DO NOT EDIT what you see in these blocks of generated code !
nRheByYm //}}AFX_MSG
\s,~|0_V DECLARE_MESSAGE_MAP()
$u::(s}
x< };
7K
/qu J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
c{})Z= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
hfRxZ>O2 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
SH6T\}X: BOOL InitHotkey();
i:
VMCNH BOOL UnInit();
VB}^&{t)! #endif
`4a9<bG u56WB9Z //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
\y+@mJWa #include "stdafx.h"
X`fer%` #include "hook.h"
I$oqFF|D #include <windowsx.h>
Pr#uV3\ #ifdef _DEBUG
__,F_9M #define new DEBUG_NEW
!OMl-:KUzE #undef THIS_FILE
/2:s g1 static char THIS_FILE[] = __FILE__;
lZ?YyRsa6& #endif
<4.j]BE #define MAX_KEY 100
Z^#u n #define CTRLBIT 0x04
uMK8V_p*? #define ALTBIT 0x02
75H;6(7 #define SHIFTBIT 0x01
qR9!DQc' #pragma data_seg("shareddata")
uevhW
HHOOK hHook =NULL;
X>U _v UINT nHookCount =0;
Er<!8;{?
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
oVIc^yk5a static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[s~6,wz static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
x+,:k=JMT static int KeyCount =0;
TECp!`)j" static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
|eP5iy wg #pragma data_seg()
&|fWtl;43 HINSTANCE hins;
'oF ('uR void VerifyWindow();
oe[f2?- BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:O]US)VSj //{{AFX_MSG_MAP(CHookApp)
aJ
J63aJ // NOTE - the ClassWizard will add and remove mapping macros here.
q)OCY}QA // DO NOT EDIT what you see in these blocks of generated code!
}[SYWJIc //}}AFX_MSG_MAP
yhd]s0(! END_MESSAGE_MAP()
W@Rb"5Gy+ @81N{tg- CHookApp::CHookApp()
ricL.[v9S {
) RNB;K~s9 // TODO: add construction code here,
N;i\.oY
// Place all significant initialization in InitInstance
/NQ
PTr }
=JN{j2xY UZJ#/x5F CHookApp theApp;
wnHfjF LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
LU+}iA) {
(9v%66y BOOL bProcessed=FALSE;
a( SJ5t?-2 if(HC_ACTION==nCode)
oH(=T/{ {
u0nIr9 if((lParam&0xc0000000)==0xc0000000){// Key up
05o<fa 2HE switch(wParam)
W;|%)D)y {
'q1cc5(ueV case VK_MENU:
+nL#c{ MaskBits&=~ALTBIT;
z+<ofZ(. break;
VUZeC,FfO case VK_CONTROL:
W>&!~9H MaskBits&=~CTRLBIT;
h8icF}m break;
[R<>3}50Y case VK_SHIFT:
L$v<t/W MaskBits&=~SHIFTBIT;
6dhzx; A break;
k \\e`= default: //judge the key and send message
`Nv P)| break;
hpYW1kfQl }
"b\@.7". for(int index=0;index<MAX_KEY;index++){
mEyIbMci if(hCallWnd[index]==NULL)
=Jswd continue;
W6V((84(O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C~T*Wlk {
ff
6x4t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3)hQT-) bProcessed=TRUE;
+HlZ?1g }
9hjzOJPuga }
|g1Pr9{wy }
I/go$@E" else if((lParam&0xc000ffff)==1){ //Key down
p;~oIy\, switch(wParam)
t\f[->f {
v[O?7Np case VK_MENU:
5),&{k! MaskBits|=ALTBIT;
m|Sf'5fK break;
d2Ta&Md case VK_CONTROL:
JthU'"K MaskBits|=CTRLBIT;
:-oMkBS break;
XT1P.
w[aA case VK_SHIFT:
AYfL}X<Ig MaskBits|=SHIFTBIT;
f9vitFkb+ break;
]rji]4s default: //judge the key and send message
T9uOOI break;
*/4hFD { }
<TgVU.* for(int index=0;index<MAX_KEY;index++)
g1@rY0O {
A[m<xtm5K if(hCallWnd[index]==NULL)
co-1r/
-O continue;
$Ww.^ym if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
M,<UnAVP- {
aI1tG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
FmgMd)# bProcessed=TRUE;
ZtY?X- 4_ }
~Gl5O`w( }
FT!X r }
ahFK^ #s if(!bProcessed){
<MoyL1= for(int index=0;index<MAX_KEY;index++){
Vze vOS if(hCallWnd[index]==NULL)
3rX40>Cs8 continue;
dF*M"|[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S" (Nf+ux SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
v7,- Q* }
I8k+Rk* }
p5l|qs }
C$4{'J-ZH return CallNextHookEx( hHook, nCode, wParam, lParam );
Ok<,_yh }
3gtKD9RL: -B #K}xL|x BOOL InitHotkey()
"^wIixOH5 {
G+<id1 if(hHook!=NULL){
??lsv(v- nHookCount++;
Q=Liy@/+! return TRUE;
m]c1DvQb }
B qLL]%F else
03"FK"2S hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
dFmpx%+p if(hHook!=NULL)
wQa,ol_p nHookCount++;
e$E>6Ngsr return (hHook!=NULL);
jwSPLq% }
p-H}NQ\ BOOL UnInit()
yT[=!M {
-Ua&/Yd/} if(nHookCount>1){
Z/d {v:) nHookCount--;
`uC^"R(m return TRUE;
<r
m)c. }
|Qn>K BOOL unhooked = UnhookWindowsHookEx(hHook);
@r(3 if(unhooked==TRUE){
&"7+k5O nHookCount=0;
KY?ujeF hHook=NULL;
fNBI!= }
2w fkXS=~6 return unhooked;
<k{_YRB }
/T+%q#4 >E3-/)Ti BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%,e,KcP' {
=sF4H_B BOOL bAdded=FALSE;
U2CC#,b!( for(int index=0;index<MAX_KEY;index++){
8fktk?| if(hCallWnd[index]==0){
q/ (h{cq hCallWnd[index]=hWnd;
Y*IKPnPot2 HotKey[index]=cKey;
,aIkiT HotKeyMask[index]=cMask;
`G%h=rr^c bAdded=TRUE;
%evtIU<h KeyCount++;
kSEgq<i! break;
8U}+9 }
I'[;E.KU }
Rtlc&Q.b return bAdded;
VP<LY/'f }
QL*RzFAD3 NE4]i BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#^(Yw|/K {
G ]uz$V6! BOOL bRemoved=FALSE;
ta^$&$l for(int index=0;index<MAX_KEY;index++){
j8aH*K-l{ if(hCallWnd[index]==hWnd){
9$D}j" if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fIJX5)D hCallWnd[index]=NULL;
.1z=VLKF' HotKey[index]=0;
*Uy;P>8 HotKeyMask[index]=0;
WD! " $ bRemoved=TRUE;
|*M07Hc x KeyCount--;
9e.$x%7j break;
^%tn$4@@Z. }
%e)?Mem }
T(Bcp^N }
J'tJY% ` return bRemoved;
T#i~/ }
<":83RCS J%T=FU void VerifyWindow()
oTx>oM, {
HLQ>
|,9 for(int i=0;i<MAX_KEY;i++){
DiGHo~f if(hCallWnd
!=NULL){ T3LVn<Lm\
if(!IsWindow(hCallWnd)){ *`LrvE@t
hCallWnd=NULL; JSmg6l?[u
HotKey=0; c
*<m.
HotKeyMask=0; btC6R>0
KeyCount--; +KWO`WR
} 6/ T/A+u
} P&<NcOCL&
} Onou:kmf1
} Q2:rWE{K!
v`G}sgn
BOOL CHookApp::InitInstance() d_ x
jW
{ gZBKe!@a|
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2%9L'-
hins=AfxGetInstanceHandle(); U"oHPK3"TA
InitHotkey(); )rlkQ'DN
return CWinApp::InitInstance(); QpRk5NeLe
} H9(UzyN>i
W39J)~D^@
int CHookApp::ExitInstance() lY2~{Y|4s
{ u J]uz%
VerifyWindow(); GG-b)64h`
UnInit(); R&g&BF
return CWinApp::ExitInstance(); h7@%}<%
} RGkV%u^
f.bw A x
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }RKsS3}
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)
n_k`L(8*
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ A (p^Q
#if _MSC_VER > 1000 BPm")DMo
#pragma once ~wOMT
#endif // _MSC_VER > 1000 Zsmv{p
jeJspch+#
class CCaptureDlg : public CDialog c;!|=
{ h9!4\{V;h
// Construction [9j,5d&m
public: 2|]
<U[
BOOL bTray; Qr7|;l3
BOOL bRegistered; ,4 q^(
BOOL RegisterHotkey(); 27,c}OS5o
UCHAR cKey; 7I@df.rf6J
UCHAR cMask; {v|ib112;
void DeleteIcon(); F! Cn'*
void AddIcon(); 7FD,TJs
UINT nCount; m,J
IId%O
void SaveBmp(); :(.:bf
CCaptureDlg(CWnd* pParent = NULL); // standard constructor I+S fZ:q^
// Dialog Data <#199`R
//{{AFX_DATA(CCaptureDlg) D>o u,
enum { IDD = IDD_CAPTURE_DIALOG }; r!w*y3
CComboBox m_Key; 3gD <!WI
BOOL m_bControl; V~Z)^.6
BOOL m_bAlt; i)$+#N
BOOL m_bShift; eibkG
CString m_Path; 0>D*d'xLd
CString m_Number; uFhPNR2l
//}}AFX_DATA jTZi<
Y:bB
// ClassWizard generated virtual function overrides 9j5|o([J
//{{AFX_VIRTUAL(CCaptureDlg) ShvC4Xb 0
public: o|c&$)m
virtual BOOL PreTranslateMessage(MSG* pMsg); 5wE6 gRJ
protected: jC$~m#F
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O '`|(L
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z@?y(E
//}}AFX_VIRTUAL }NRt:JC
// Implementation vILB$%I
protected: mwN"Cu4t
HICON m_hIcon; a`]ZyG*P
// Generated message map functions -[pfLo
//{{AFX_MSG(CCaptureDlg) ^eefR5^_w
virtual BOOL OnInitDialog(); ,\#j6R,{I
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kmo#jITa`
afx_msg void OnPaint(); RlU ?F
afx_msg HCURSOR OnQueryDragIcon(); -*hPEgcV9
virtual void OnCancel(); `ZO5-E
afx_msg void OnAbout(); .6y*Z+Zg
afx_msg void OnBrowse(); Pgq(yPC
afx_msg void OnChange(); Pth4_]US
//}}AFX_MSG x1STjI>i
DECLARE_MESSAGE_MAP() $}5M`p\&C
}; <<Y]P+uU
#endif #pPR>,4
E[=&6T4
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file a?4Asn
#include "stdafx.h" ~m0=YAlk?
#include "Capture.h" e=IbEm{|
#include "CaptureDlg.h" "LW\osjen
#include <windowsx.h> KL9JA;"
#pragma comment(lib,"hook.lib") yB=R7E7
#ifdef _DEBUG )8n?.keq
#define new DEBUG_NEW w40*vBz
#undef THIS_FILE sSD&'K=lq
static char THIS_FILE[] = __FILE__; yd'cLZd<}
#endif H@ty'z?
#define IDM_SHELL WM_USER+1 M?hPlo"_
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DT6BFx
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rM6S%rS
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +u t%C.1
class CAboutDlg : public CDialog pU,\ &3N
{ n<HF]
public: yp@cn(:~
CAboutDlg(); \IzZJGi
// Dialog Data 9$VdYw7D
//{{AFX_DATA(CAboutDlg) u`oJ3mS;
enum { IDD = IDD_ABOUTBOX }; <Hz11
}<(
//}}AFX_DATA CDW|cr{
// ClassWizard generated virtual function overrides =,i?8Fuz
//{{AFX_VIRTUAL(CAboutDlg) Qy=tkCN
protected: fIatp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1DL+=-
//}}AFX_VIRTUAL J
p%J02
// Implementation ;j(*:Nt1
protected: l^o>7 cM
//{{AFX_MSG(CAboutDlg) 6z/&j} (
//}}AFX_MSG i=M[$
DECLARE_MESSAGE_MAP() f(K1,L:&7
}; 7Wiwnv_"
O8rd*+
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }g%&}`%'
{ 8^^ehaxy
//{{AFX_DATA_INIT(CAboutDlg) 8JW0;H<
//}}AFX_DATA_INIT J4iu8_eH!D
} <Nc9F['
*laFG<;
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3O2vY1Y2
{ QV*la= j/
CDialog::DoDataExchange(pDX); KVViTpZ
//{{AFX_DATA_MAP(CAboutDlg) ^{++h?cS)
//}}AFX_DATA_MAP e(`r"RrQ
} 98_os2`
x}d5Y
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _+}hId
//{{AFX_MSG_MAP(CAboutDlg) YhAO
// No message handlers rEU1
VvE
//}}AFX_MSG_MAP ;;U&mhz`
END_MESSAGE_MAP() y] Cx[
|c-`XC2g
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^BI&-bR@
: CDialog(CCaptureDlg::IDD, pParent) ]x3 )OjH
{ 0&r}'f?
//{{AFX_DATA_INIT(CCaptureDlg) OT)`)PZ"
m_bControl = FALSE; HBk5p>&
m_bAlt = FALSE; R\$6_
m_bShift = FALSE; 40-/t*2Ly
m_Path = _T("c:\\"); ]Rp<64I o
m_Number = _T("0 picture captured."); v{\~>1J{
nCount=0; |Z Cv>8?n
bRegistered=FALSE; P5"B7>L:
bTray=FALSE; "e29j'u!*
//}}AFX_DATA_INIT OU mZ|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +OB&PE
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q-U,1b
} 8@T0]vH&
b~8&P_
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CyB1`&G>
{ U[#q"'P|l
CDialog::DoDataExchange(pDX); K:pG<oV|}
//{{AFX_DATA_MAP(CCaptureDlg) 1'B=JyR~K
DDX_Control(pDX, IDC_KEY, m_Key); xelh!AtE
DDX_Check(pDX, IDC_CONTROL, m_bControl); SBw'z(U
DDX_Check(pDX, IDC_ALT, m_bAlt); _,- \;
DDX_Check(pDX, IDC_SHIFT, m_bShift); [~Z#yEiW^
DDX_Text(pDX, IDC_PATH, m_Path); _tO2PIL@Z
DDX_Text(pDX, IDC_NUMBER, m_Number); r&L1jT.
//}}AFX_DATA_MAP Vr&v:8:wb
} z:{R4#(Q
tfe'].uT
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Z@Qf0
c
//{{AFX_MSG_MAP(CCaptureDlg) 2"Y=*s
ON_WM_SYSCOMMAND() 1fF\k#BE-%
ON_WM_PAINT() ;{n*F=%uC
ON_WM_QUERYDRAGICON() G0ENk|wbbj
ON_BN_CLICKED(ID_ABOUT, OnAbout) 0XL[4[LdA
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \nQEvcH
ON_BN_CLICKED(ID_CHANGE, OnChange) EVbDI yFn
//}}AFX_MSG_MAP Uf$IH!5;Z
END_MESSAGE_MAP() ?/p."N:]H
a1weTn*
BOOL CCaptureDlg::OnInitDialog() RZj06|r8
{ <)@^TRS
CDialog::OnInitDialog(); _)#~D*3
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fK=vLcH
ASSERT(IDM_ABOUTBOX < 0xF000); wp-3U}P2(
CMenu* pSysMenu = GetSystemMenu(FALSE); 23q2u6.F`
if (pSysMenu != NULL) `7',RUj|D
{ _'s5FlZq
CString strAboutMenu; \z2d=E
strAboutMenu.LoadString(IDS_ABOUTBOX); dBW#PRg
if (!strAboutMenu.IsEmpty()) ['0^gN$:e
{ IRI<no
pSysMenu->AppendMenu(MF_SEPARATOR); c;R.rV<
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8EI&}I
} Z,b^f
Vw
} a&R,jq
SetIcon(m_hIcon, TRUE); // Set big icon 1+Y;
"tT
SetIcon(m_hIcon, FALSE); // Set small icon .fY$$aD$4
m_Key.SetCurSel(0); s|"4!{It
RegisterHotkey(); nON"+c*
CMenu* pMenu=GetSystemMenu(FALSE); v/wR)9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 061 f
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ob-k`@_|
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )v.\4Q4
return TRUE; // return TRUE unless you set the focus to a control ]JI
A\|b6
} .GPuKP|
h3A|nd>\
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j;*=
^s
{ aK9zw
if ((nID & 0xFFF0) == IDM_ABOUTBOX) MK4CggoC
{ ' }NH$ KA
CAboutDlg dlgAbout; c-a;nAR
dlgAbout.DoModal(); %M05& <
} {|@N~c+
else >[g'i+{
{ 7jF2m'(
CDialog::OnSysCommand(nID, lParam); 2?owXcbx
} oga0h'
} ]^l-k@
Xc]Q_70O
void CCaptureDlg::OnPaint() Qp>Q-+e0
{ H0mDs7
if (IsIconic()) _n<
@Jk~
{ =TXc- J
CPaintDC dc(this); // device context for painting vy F(k3W
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ymyk.#Z<%
// Center icon in client rectangle ]5J*UZ}
int cxIcon = GetSystemMetrics(SM_CXICON); *yA.D?
int cyIcon = GetSystemMetrics(SM_CYICON); Bk~M ^AK@~
CRect rect; .'N#qs_
GetClientRect(&rect); {eo?vA8SE
int x = (rect.Width() - cxIcon + 1) / 2; /?QBMI
int y = (rect.Height() - cyIcon + 1) / 2; Ad`jV_z
// Draw the icon 1Aa=&B2
dc.DrawIcon(x, y, m_hIcon); Yy0m &3[
} <8/lHQ^\)
else w+tO@
{ rx;zd ?
CDialog::OnPaint(); k$} 6Qd
} WR"p2=
} mdHC{sp
aMjCqu05
HCURSOR CCaptureDlg::OnQueryDragIcon() jl4rEzVu
{ Cqk6I gw
return (HCURSOR) m_hIcon; LIHf]+
} o>Z+=&BZ@a
$(%t^8{a~G
void CCaptureDlg::OnCancel() K?+Rq
{ `{I-E5x
if(bTray) .c.#V:XZ#U
DeleteIcon(); ;rH@>VrR
CDialog::OnCancel(); pF"IDC
} Yt;.Z$i ,
tI(co5 W
void CCaptureDlg::OnAbout() .{W)E
{ sWnU*Q
CAboutDlg dlg; c8jq.y v
dlg.DoModal(); >j$CM:w
} \D
#NO
g @lAk%V4
void CCaptureDlg::OnBrowse() /P|jHK|{
{ FeFH_
CString str; #VEHyz 6P
BROWSEINFO bi; I2'UC)
0
char name[MAX_PATH]; [(N<E/m %B
ZeroMemory(&bi,sizeof(BROWSEINFO)); %fz!'C_4
bi.hwndOwner=GetSafeHwnd(); SSF4P&
bi.pszDisplayName=name; Wz7jB6AWA
bi.lpszTitle="Select folder"; D?Q{&6p
bi.ulFlags=BIF_RETURNONLYFSDIRS; z7J2O
LPITEMIDLIST idl=SHBrowseForFolder(&bi); u-. _;
if(idl==NULL) )/9/p17:xu
return; +d736lLe%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); kSw.Q2ao
str.ReleaseBuffer(); ~dK)U*Q
m_Path=str; IPnbR)[%
if(str.GetAt(str.GetLength()-1)!='\\') OsR4oT
m_Path+="\\"; ,tL<?6_
UpdateData(FALSE); L[*Xrp;/&
} I.\fhNxHY
/^\6q"'
void CCaptureDlg::SaveBmp() OPwj*b:-m
{ ( Qw"^lE3
CDC dc; dg1h<]T"9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); .Eg>)
CBitmap bm; g+k0Fw]!
int Width=GetSystemMetrics(SM_CXSCREEN); 3B|o
int Height=GetSystemMetrics(SM_CYSCREEN); T!)v9L
bm.CreateCompatibleBitmap(&dc,Width,Height); `:A`%Fg8<
CDC tdc; eJ#q! <
tdc.CreateCompatibleDC(&dc); ``}EbOMG
CBitmap*pOld=tdc.SelectObject(&bm); fNx3\<~V=
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X] &Q^
tdc.SelectObject(pOld); m>'sM1s
BITMAP btm; fgP_NYfOj
bm.GetBitmap(&btm); tq^H)
DWORD size=btm.bmWidthBytes*btm.bmHeight; b^\u
P
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Hs8c%C
BITMAPINFOHEADER bih; |}\et
ecB
bih.biBitCount=btm.bmBitsPixel; ,!3G
bih.biClrImportant=0; Kuy,qZv!"
bih.biClrUsed=0; P/?`
bih.biCompression=0; "el}@
bih.biHeight=btm.bmHeight; TCFx+*fBd
bih.biPlanes=1; Xb=9~7&,$
bih.biSize=sizeof(BITMAPINFOHEADER); o+(.Pb
bih.biSizeImage=size; B&yb%`9],W
bih.biWidth=btm.bmWidth; ;X !sTs
bih.biXPelsPerMeter=0; gYx|Na,+
bih.biYPelsPerMeter=0; 'kK}9VKl
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <w.W[ak
static int filecount=0; V 3-5:z
CString name; b$+.}&M
name.Format("pict%04d.bmp",filecount++); 0Q=4{*:?
name=m_Path+name; ^e>`ob
BITMAPFILEHEADER bfh; &gZ5dTj>
bfh.bfReserved1=bfh.bfReserved2=0; jYRwtP\
bfh.bfType=((WORD)('M'<< 8)|'B'); #!KbqRt
bfh.bfSize=54+size; .Kr?vD^nG
bfh.bfOffBits=54; v*1UNXU\
CFile bf; 41WnKz9c
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B`}?rp
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); QdL
;|3K9
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /PAxPZf_
bf.WriteHuge(lpData,size); xGJ{_M
bf.Close(); keEyE;O}u
nCount++; 70l" [Y
} &CFHH"OsT
GlobalFreePtr(lpData); T"XP`gk
if(nCount==1) G_g~-[O
m_Number.Format("%d picture captured.",nCount); J
A ]s
else #n7uw
m_Number.Format("%d pictures captured.",nCount); "EQ-`b=I4
UpdateData(FALSE); X 6/k `J
} "8aw=3A
iNgHx[*?
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) XS]=sfN
{ M&
GA:`
if(pMsg -> message == WM_KEYDOWN) =usx' #rb
{ r"SuE:D
if(pMsg -> wParam == VK_ESCAPE) yK<%AV@v
return TRUE; utC]GiR
if(pMsg -> wParam == VK_RETURN) JB a:))lw
return TRUE; h&||Ql1
} impzqQlZ,
return CDialog::PreTranslateMessage(pMsg); c.Pyt
} it!8+hvq9*
16[>af0<g
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0 }k[s+^
{ ig]*Z
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P'GX-H
SaveBmp(); TGGeTtk=
return FALSE; u<./ddC
} 9. Q;J#;1
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (t1:2WY@
CMenu pop; 1"009/|
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |r!G(an1x4
CMenu*pMenu=pop.GetSubMenu(0); *? 7Ie;)
pMenu->SetDefaultItem(ID_EXITICON); DF/p{s1Y3
CPoint pt; s"<k)Xi
GetCursorPos(&pt); J_OIU#-B
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); el39HB$
if(id==ID_EXITICON) dy;Ue5
DeleteIcon(); C ".&m
else if(id==ID_EXIT) ZJ@M}-4O1
OnCancel(); p
mcy(<
return FALSE; J
(Yfup
} 0ejx;Mum
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n|Vs2 7
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a= ;7
AddIcon(); &96I4su
return res; #Na3eHT
} tWD~|<\. )
d>}pz
void CCaptureDlg::AddIcon() W`K XO|'p@
{ xxgS!J
NOTIFYICONDATA data; ` ZXX[&C
data.cbSize=sizeof(NOTIFYICONDATA); (Kd;l&8
CString tip; &!vJ3:
tip.LoadString(IDS_ICONTIP); kN>%y&cK
data.hIcon=GetIcon(0); c%r?tKG6
data.hWnd=GetSafeHwnd(); }kdYR#{s
strcpy(data.szTip,tip); V}=9S@$o
data.uCallbackMessage=IDM_SHELL; +.whEw(i
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8E"Ik~
data.uID=98; UMuqdLaT9
Shell_NotifyIcon(NIM_ADD,&data); 8P0XY
S@
ShowWindow(SW_HIDE); 7OYNH0EH
bTray=TRUE; 7OG=LF*V-
} aR ao\Wp|
p#)u2^
void CCaptureDlg::DeleteIcon() V|ax(tHv
{ _ro^<V$%
NOTIFYICONDATA data; 8Br*
data.cbSize=sizeof(NOTIFYICONDATA);
;?1H&
data.hWnd=GetSafeHwnd(); UP}Ys*
data.uID=98; <Vm+Lt9
Shell_NotifyIcon(NIM_DELETE,&data); 8i=J(5=
ShowWindow(SW_SHOW); *+re2O)Eh'
SetForegroundWindow(); :XEP:8
ShowWindow(SW_SHOWNORMAL); t&^9o$
bTray=FALSE; ]tL9 y<
} nellN}jYsM
ByoSwQ
void CCaptureDlg::OnChange() }(z[
rZ
{ 6uW?xB9
RegisterHotkey(); ,J"6(nk
} EFu2&P
&WE| 9
BOOL CCaptureDlg::RegisterHotkey() -gefdx6ES
{ F]\(p=U.
UpdateData(); jt?4raNW
UCHAR mask=0; Z;=G5O
uvQ
UCHAR key=0; Lz's!b
if(m_bControl) mufi>}
mask|=4; /Pv
d[oF
if(m_bAlt) n]?Yv E
mask|=2; AHc:6v^
if(m_bShift) n~l9`4wJY
mask|=1; q%%8oaEI
key=Key_Table[m_Key.GetCurSel()]; NypM+y
if(bRegistered){ @&t';"AE
DeleteHotkey(GetSafeHwnd(),cKey,cMask); hJ\IE?+
bRegistered=FALSE; 1r;]==
} J^8(h R
cMask=mask; R)MWO5
cKey=key; S.1\e"MfI
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5A
oKlJrY
return bRegistered; [74HUw>
} c""*Ng*T
N7:=%F y(
四、小结 h3D~?Iom
\fIGMoy!
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。