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:
0{B<A^Bf
6pS}\aD 一、实现方法
sCY 7bO>[RQB 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:
+FadOx7X$ yv]|Ce@8A #pragma data_seg("shareddata")
)h 6 w@TF HHOOK hHook =NULL; //钩子句柄
wE=I3E % UINT nHookCount =0; //挂接的程序数目
f&^"[S"\f static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
L-}Uj^yF static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Rzsu 7w static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
j0~c2 static int KeyCount =0;
C@:X9NU static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
F."ZCEb #pragma data_seg()
e4Qjx*[G U _A'/p^D 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。
vdgK3I >0ZG&W9 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:
@|t]9 w0j'>4 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
sUc[!S:/ cKey,UCHAR cMask)
fa/o4S< {
^{=UKf{ BOOL bAdded=FALSE;
+2eri_p for(int index=0;index<MAX_KEY;index++){
{.e+?V2>_ if(hCallWnd[index]==0){
'/\*l< hCallWnd[index]=hWnd;
Da8gOZ HotKey[index]=cKey;
wzxV)1jT HotKeyMask[index]=cMask;
P/[RH e bAdded=TRUE;
`@1e{?$ KeyCount++;
T+B-R\@t break;
qyVARy }
%B#T"=Cx }
zY*~2|q,s return bAdded;
Cc{{9Ud }
$,/E"G` //删除热键
N3\RXXY BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'-N5F {
3o>JJJ=] BOOL bRemoved=FALSE;
FCwE/ 2, for(int index=0;index<MAX_KEY;index++){
sxRKWM@4 if(hCallWnd[index]==hWnd){
0',buJncV if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"?aI hCallWnd[index]=NULL;
g)$KN,gGuO HotKey[index]=0;
cU ?F D HotKeyMask[index]=0;
b3[!1i bRemoved=TRUE;
6E1~dK0t KeyCount--;
T_UJ?W break;
gXs9qY%= }
_U4@W+lhX_ }
`'XN2-M8 }
zvq}7, return bRemoved;
P=<lY}, }
6m]?*k1HC w[3a^ t&w.Wc X) DLL中的钩子函数如下:
~&ns?z>x /E\04Bs LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
2NjgLXP {
a]5y
CBm BOOL bProcessed=FALSE;
rf]z5; if(HC_ACTION==nCode)
W,yLGz \ {
C<T6l'S{? if((lParam&0xc0000000)==0xc0000000){// 有键松开
LdOme[C1 switch(wParam)
Qt>kythi {
0$-|Th:o case VK_MENU:
ZDp^k{AN9a MaskBits&=~ALTBIT;
D8~\*0-> break;
)h0>e9z>Y case VK_CONTROL:
{4/*2IRN9h MaskBits&=~CTRLBIT;
?#&[1.= u break;
(vD==n9Hd case VK_SHIFT:
\P":V MaskBits&=~SHIFTBIT;
0iR?r+| break;
3[_WTwX0 default: //judge the key and send message
PbS1`8|4 break;
VrfEa d }
?Q"<AL>Z for(int index=0;index<MAX_KEY;index++){
(X5y%~;V5a if(hCallWnd[index]==NULL)
{2T u_2> continue;
wVI_SQ<8V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_s0)Dl6K {
(
[a$Z2m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
A ep](je bProcessed=TRUE;
ZQ`4'|" }
V6c8o2G;+ }
)
] Ro }
jxm#4 else if((lParam&0xc000ffff)==1){ //有键按下
u0k'Jh]K switch(wParam)
kiyKL:6D| {
#Q["[}flVv case VK_MENU:
"O$WfpKX MaskBits|=ALTBIT;
ONpvx5'# break;
3w p@OF_ case VK_CONTROL:
BKI-Dh MaskBits|=CTRLBIT;
q)C
Xu break;
zx:;0Z:S6> case VK_SHIFT:
H<ovIMd MaskBits|=SHIFTBIT;
IaRwPDj6 break;
WEG!;XZ default: //judge the key and send message
UfO='&U^ break;
u\@Qze }
ARnq~E@1 for(int index=0;index<MAX_KEY;index++){
^jS1g*nrN if(hCallWnd[index]==NULL)
u^^jt(j continue;
Dt7z<1-)l if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Lh-Y5(c
o {
SCMvq?9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
]lyQ*gM bProcessed=TRUE;
)
d'H&c3 }
6?.S-.Mr }
6nsb)7a }
+.^pAz U}R if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
4)}>dxv for(int index=0;index<MAX_KEY;index++){
l]t^MEoc8 if(hCallWnd[index]==NULL)
C{t}q*fG
5 continue;
M3!;u%~}s if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ZvC?F=tH SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(yuOY/~k/ //lParam的意义可看MSDN中WM_KEYDOWN部分
|cuKC \ }
0d:t=LKw) }
=2rdbq6R }
@Ss W return CallNextHookEx( hHook, nCode, wParam, lParam );
1\/vS$bi( }
$Fc}K+ >Q"3dw 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
wfu`(4 =I&BO[d BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
g%^/^<ei BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
NgsEEPu? ,SdxIhL 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
[z7]@v6b z,dFDl$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
-R];tpddR5 {
G i( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Cl&)# {
!P=L0A` //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
'ju_l)(R SaveBmp();
H0lW gJmi| return FALSE;
OU]"uV<( }
b 5K"lPr …… //其它处理及默认处理
g~9rt_OV }
:~s*yznf /']`}*d &ns??:\+T 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。
cR55,DR,#W ih75C" 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。
2p 7;v7)y f`-vnh^+ 二、编程步骤
e iH&<AH 2t?>0)*m 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";
wXdt\@Qr D]'8BS3 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
n
>E1\($ *N{k#d/ 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;
u!It';j Sc}Rs 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|^p9m"=% YReI|{O$c 5、 添加代码,编译运行程序。
&h6 `hP_ T(cpU,Q 三、程序代码
%7\l+g, O\]{6+$fm! ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<+%y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
1`Bhis9X8 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
}+u<w{-7/ #if _MSC_VER > 1000
,ag*
/ #pragma once
:y{@=E=XSC #endif // _MSC_VER > 1000
] ONmWo77o #ifndef __AFXWIN_H__
md\Vw?PkU #error include 'stdafx.h' before including this file for PCH
D=5%lL #endif
c5KciTD^ #include "resource.h" // main symbols
w'xPKO$bzR class CHookApp : public CWinApp
1guiuR4 {
s{Y-Vdx public:
fv*
$=m CHookApp();
p>T // Overrides
*|L;&XM&/ // ClassWizard generated virtual function overrides
dIQ3snG //{{AFX_VIRTUAL(CHookApp)
bG.`> public:
\l5G virtual BOOL InitInstance();
4Uwcc):f virtual int ExitInstance();
l[WX77bp= //}}AFX_VIRTUAL
:8+x&zn //{{AFX_MSG(CHookApp)
A&-2f]L
tl // NOTE - the ClassWizard will add and remove member functions here.
,^v_gc // DO NOT EDIT what you see in these blocks of generated code !
Ck/w:i@>? //}}AFX_MSG
4VsttT DECLARE_MESSAGE_MAP()
fP( n 3Q };
=gd~rk9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k%N$eO$ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*J4\KU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Z{F^qwne BOOL InitHotkey();
1^WkW\9kO BOOL UnInit();
LiGECqWBa' #endif
(J(SwL| YXU2UIY<~ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
]yFO~4Nu #include "stdafx.h"
}^odUIj #include "hook.h"
^Vc(oa&; #include <windowsx.h>
/kO%aN #ifdef _DEBUG
?xQm_
91X^ #define new DEBUG_NEW
9:E.Iy #undef THIS_FILE
4a.8n!sys static char THIS_FILE[] = __FILE__;
\y7\RV>>3b #endif
Oo>Uu{{ #define MAX_KEY 100
\x8'K #define CTRLBIT 0x04
Gch3|e #define ALTBIT 0x02
DsHm,dZ #define SHIFTBIT 0x01
x IL]Y7HWM #pragma data_seg("shareddata")
Qk.[# HHOOK hHook =NULL;
>ca`0gu UINT nHookCount =0;
S1i~r+jf static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
_.W;hf` static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
h}oV)z6 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
%;GRR (K static int KeyCount =0;
{k'$uW` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
N=!k2+ #pragma data_seg()
,v9*|>4 HINSTANCE hins;
TD!c+${w void VerifyWindow();
G/1V4-@ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
ySlGqR1H //{{AFX_MSG_MAP(CHookApp)
6\QsK96_ // NOTE - the ClassWizard will add and remove mapping macros here.
Vk1 c14i> // DO NOT EDIT what you see in these blocks of generated code!
`@<)#9'A //}}AFX_MSG_MAP
h4~VzCR4x\ END_MESSAGE_MAP()
wu}Zu %=vU
Z4 CHookApp::CHookApp()
iVM% ]\ {
WBD"d<>' // TODO: add construction code here,
> IZ$ .- // Place all significant initialization in InitInstance
`n`HwDo;i }
,!^;<UR: -e+im(2D= CHookApp theApp;
]^QO^{Sz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
mw\Pv| {
4%SA%]a L1 BOOL bProcessed=FALSE;
^/$U(4 if(HC_ACTION==nCode)
2(9~G|C. {
? y[i6yN9 if((lParam&0xc0000000)==0xc0000000){// Key up
4(8BWP~.y2 switch(wParam)
O<?.iF% {
{'+.?g case VK_MENU:
ipRH.1= MaskBits&=~ALTBIT;
vH"^a/95| break;
x^ Y sXzu case VK_CONTROL:
Tx$bg( MaskBits&=~CTRLBIT;
,@8*c0Y~<! break;
aq^OzKP? case VK_SHIFT:
m9$lOk4/ MaskBits&=~SHIFTBIT;
H5A7EZq}` break;
(^)(#CxO default: //judge the key and send message
};>~P%u32 break;
. H8 6f != }
(+bt{Ma for(int index=0;index<MAX_KEY;index++){
%^;rYn3 if(hCallWnd[index]==NULL)
*adwCiB continue;
9%?a\#C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-JdNA2P
{
h,i=Y+1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2)|G%f_lS bProcessed=TRUE;
LH q~` }
D.w6/DxaXa }
'=ydU+X }
42PA?^xPw else if((lParam&0xc000ffff)==1){ //Key down
Ot~buf'| switch(wParam)
%? O$xQ.< {
{jEEAH) case VK_MENU:
zi+NQOhR MaskBits|=ALTBIT;
"Q1oSpF break;
mfgUf case VK_CONTROL:
lnrs4s Km MaskBits|=CTRLBIT;
=n_>7@9l break;
S@WT;Q2Z case VK_SHIFT:
z3|5E#m MaskBits|=SHIFTBIT;
*7yrm&@nG break;
Lr(My3vF8q default: //judge the key and send message
*V@t]d$=# break;
%$+bO/f }
3s,a%GOk for(int index=0;index<MAX_KEY;index++)
" 8g\UR"[ {
]
N7(<EV/ if(hCallWnd[index]==NULL)
eeOG(@@o( continue;
M4L<u,\1s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V6^=[s R {
cx*$GaMk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Tl-Ix&37 bProcessed=TRUE;
qo:t"x^ }
7k#0EhN 1> }
XlxM.;i0H }
LP//\E_] if(!bProcessed){
LcmZ"M6 for(int index=0;index<MAX_KEY;index++){
8 v<*xy if(hCallWnd[index]==NULL)
ce1U}">11 continue;
249DAjn+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#7naI*O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
BBRZlx }
b'(Hwc\ t }
,o6,(jJU }
2;ac&j1 return CallNextHookEx( hHook, nCode, wParam, lParam );
&MJ`rj[% }
J!5&Nc VJ-To} BOOL InitHotkey()
cwI3ANV {
[}?E,1Q3 if(hHook!=NULL){
Lz`_&&6 nHookCount++;
<-=g)3_ return TRUE;
tjcG^m} _ }
{[r}gS% else
,TQ;DxB}=E hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
g"X!&$& if(hHook!=NULL)
O7zj8 nHookCount++;
gq&jNj7V return (hHook!=NULL);
}_9yemP }
LOe l6Ui BOOL UnInit()
)*9,H|2nS {
p 8lm1; if(nHookCount>1){
.;%`I nHookCount--;
O+ J0X*&x return TRUE;
/*m6-DC }
(*V:{_r BOOL unhooked = UnhookWindowsHookEx(hHook);
H:,Hr_;nC if(unhooked==TRUE){
v=?/c-J* nHookCount=0;
7y=1\KW( hHook=NULL;
O`0\f8/.? }
OBnvY2)Ri return unhooked;
uB+:sX-L }
XOPiwrg%p ]?0]K!7Ea BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@eN,m {b {
J?qikE& BOOL bAdded=FALSE;
!'kr:r}gg for(int index=0;index<MAX_KEY;index++){
;^ YpQP if(hCallWnd[index]==0){
}n?D#Pk, hCallWnd[index]=hWnd;
]oyWJ#8 HotKey[index]=cKey;
>$;,1N $bd HotKeyMask[index]=cMask;
opon"{ bAdded=TRUE;
a- 7RJ. KeyCount++;
lLNI5C break;
<O~ieJim
}
saVX2j6Y }
O\}w&BE:h return bAdded;
g ~>nT>6 }
P+Sgbtc w9CX5Fg BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
xgZ<.r {
[lE^0_+ BOOL bRemoved=FALSE;
:Oi}X7\ for(int index=0;index<MAX_KEY;index++){
a*!9RQ if(hCallWnd[index]==hWnd){
9Q&]5|x if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
6'jgjWEe3& hCallWnd[index]=NULL;
4+F@BxpB HotKey[index]=0;
M8f[ ck HotKeyMask[index]=0;
\};
4rm}V bRemoved=TRUE;
|pR'#M4j4A KeyCount--;
(%*~5%l\ break;
8,]wOxwqi }
FOS*X }
/7K7o8g }
*xDV8iu_ return bRemoved;
G Cp90 }
d"}lh:L9 gyOAvx void VerifyWindow()
<P-AlHYV- {
a#+;BH1 for(int i=0;i<MAX_KEY;i++){
#[y2nK3zF if(hCallWnd
!=NULL){ |5\:
E}1
if(!IsWindow(hCallWnd)){ Dx.hM[
hCallWnd=NULL; DN|+d{^lN
HotKey=0; 1A N)%
HotKeyMask=0; @g1T??h
KeyCount--; kf_*=ER
} 'F7UnkKO|
} E{[>j'dwc
} `i6q\-12n
} 7E R!>l+
{"\pMY'7
BOOL CHookApp::InitInstance() X^d}eWP`I
{ \d
QRQL{LL
AFX_MANAGE_STATE(AfxGetStaticModuleState()); qmq#(%Z <W
hins=AfxGetInstanceHandle(); BXUd
i&'O
InitHotkey(); "tmr
s_~
return CWinApp::InitInstance(); ?)e6:T(
} 'o1lJ?~kH
z"V`8D
int CHookApp::ExitInstance() d@
tD0s
{ 1c:/c|shQ_
VerifyWindow(); /B5rWJ2AS
UnInit(); +l>X Z
return CWinApp::ExitInstance(); e(jD[q
} gX/?
Ob|v$C
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9zaSA,}
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7lG,.W|
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ z<8WN[fB
#if _MSC_VER > 1000 6V-JyTcxGI
#pragma once j +Ro?
#endif // _MSC_VER > 1000 /@6T~XY M
h{CyYsQ
class CCaptureDlg : public CDialog CA,2&v"
{ P8GGN
// Construction uEyu s96 +
public: T_<:
BOOL bTray; p?x]|`M
BOOL bRegistered; %6TS_IpJ
BOOL RegisterHotkey(); #Z}YQ$g
UCHAR cKey; U (A#}
UCHAR cMask; ccgV-'IG9
void DeleteIcon(); b`|,rfq^AZ
void AddIcon(); m<|fdS'@
UINT nCount; &Pgk$e%>
void SaveBmp(); R5fZ}C7
CCaptureDlg(CWnd* pParent = NULL); // standard constructor sb</-']a
// Dialog Data Fc a_(jw
//{{AFX_DATA(CCaptureDlg) gr4JaV
enum { IDD = IDD_CAPTURE_DIALOG }; nT@FSt
CComboBox m_Key; I6[=tB
BOOL m_bControl; EKzYL#(i
BOOL m_bAlt; i
[6oqZ
BOOL m_bShift; .'S_9le
CString m_Path; &e5,\TQ
CString m_Number; 5>rjL;
//}}AFX_DATA 'UB"z{w%
// ClassWizard generated virtual function overrides [<VyH.
//{{AFX_VIRTUAL(CCaptureDlg) g HKA:j`c
public: kTo{W]9]
virtual BOOL PreTranslateMessage(MSG* pMsg); Q6fPqEX=
protected: +$B#] ,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $GIup5
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #;<dtw
//}}AFX_VIRTUAL M/jdMfU
// Implementation 42wZy|oqp
protected: H2E'i\
HICON m_hIcon; -<^3!C >
// Generated message map functions kl#)0yqN0
//{{AFX_MSG(CCaptureDlg) oNRp
virtual BOOL OnInitDialog(); p+Icq!aH5
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iL3k8:x
afx_msg void OnPaint(); els71t -
afx_msg HCURSOR OnQueryDragIcon(); p.!p6ve){
virtual void OnCancel(); ivPX_#QI
afx_msg void OnAbout(); _6C,w`[[6
afx_msg void OnBrowse(); T_~xDQ` v
afx_msg void OnChange(); CMHg]la
//}}AFX_MSG p\r V 6+
DECLARE_MESSAGE_MAP() @<44wMp
}; Z^GXKOeq
#endif h($Jo
{D4N=#tl
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #YB3Ug]z
#include "stdafx.h" bdvVPjGc&
#include "Capture.h" r+}<]?aT>-
#include "CaptureDlg.h" qEnmms 1
#include <windowsx.h> ^Rmrre`uU
#pragma comment(lib,"hook.lib") 3y-P-NI~=
#ifdef _DEBUG E# *`u
#define new DEBUG_NEW dlc'=M
#undef THIS_FILE
ex)U'.^
static char THIS_FILE[] = __FILE__; B[[1=
#endif !tuK.?q|l
#define IDM_SHELL WM_USER+1 vXibg
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wKAxUPzm
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s7:w>,v/
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]VK9d;0D
class CAboutDlg : public CDialog xO;Qr.3PX
{
fG|+!
public: Rlx
CAboutDlg(); KL8WT6!RZ
// Dialog Data YtY.,H;
//{{AFX_DATA(CAboutDlg) bs_rw+
enum { IDD = IDD_ABOUTBOX }; (.~'\@
//}}AFX_DATA =B
ts
// ClassWizard generated virtual function overrides *+<H4.W
H
//{{AFX_VIRTUAL(CAboutDlg) D0rqte
protected: {fu[&@XV
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ufS0UD8%H
//}}AFX_VIRTUAL hPrE
// Implementation n16TQe"8
protected: r8[Ywn<u
//{{AFX_MSG(CAboutDlg) eHH9#Vrhc$
//}}AFX_MSG gOm%?sg
DECLARE_MESSAGE_MAP() \`WAG>'l5
}; n|!O .+\b
No(S#,vJ;
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5
OF*PBZ
{ q??N,
//{{AFX_DATA_INIT(CAboutDlg)
Ox+}JB
[
//}}AFX_DATA_INIT ( ALsc@K
} =8x-+u5}rK
MpLn)
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .;NoKO7)
{
h]?[}&
CDialog::DoDataExchange(pDX); ((tWgSZ3
//{{AFX_DATA_MAP(CAboutDlg) X$ 76#x
//}}AFX_DATA_MAP )LE#SGJP
} _<l 9j;6
[`=:uUf3
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $q$\
//{{AFX_MSG_MAP(CAboutDlg) ;%xG bg!lg
// No message handlers e}q!m(K]e-
//}}AFX_MSG_MAP Zz56=ZX*_
END_MESSAGE_MAP() K yp(dp>
{;?bC'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v{TISgZ
: CDialog(CCaptureDlg::IDD, pParent) o@:u:n+.
{ RUlJP
//{{AFX_DATA_INIT(CCaptureDlg) ]=m0@JTbG
m_bControl = FALSE; +ZeK,Y+Xy
m_bAlt = FALSE; 5c3&4,,eR
m_bShift = FALSE; "aeKrMgc6V
m_Path = _T("c:\\"); }o9(Q8
m_Number = _T("0 picture captured."); [NguQ]B.
nCount=0; <N\#6m
bRegistered=FALSE; /lN09j
bTray=FALSE; EO\@#",a
//}}AFX_DATA_INIT Fs1ms)
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vKNxL^x
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); btIh%OM
} SLI358]$<
/R)(u@jk
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?[S{kMb2
{ DwH=ln=
CDialog::DoDataExchange(pDX); B<?fD
//{{AFX_DATA_MAP(CCaptureDlg) >?0 f>I%\
DDX_Control(pDX, IDC_KEY, m_Key); D_Cd^;b
DDX_Check(pDX, IDC_CONTROL, m_bControl); 6Pu5 k;H
DDX_Check(pDX, IDC_ALT, m_bAlt); nv"D
DDX_Check(pDX, IDC_SHIFT, m_bShift); ?c#v'c^=h
DDX_Text(pDX, IDC_PATH, m_Path); 4p_@f^v~QH
DDX_Text(pDX, IDC_NUMBER, m_Number); b:(*C
//}}AFX_DATA_MAP >rzpYc'~w
} S]&7
;gv9J[R
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) AJ-~F>gn
//{{AFX_MSG_MAP(CCaptureDlg) <D{_q.`vA
ON_WM_SYSCOMMAND() +G>;NiP_
ON_WM_PAINT() Gzu $
ON_WM_QUERYDRAGICON() t!}?nw%$
ON_BN_CLICKED(ID_ABOUT, OnAbout) Y4n;[nHQ(
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~yuj;9m3
ON_BN_CLICKED(ID_CHANGE, OnChange) y5bELWA
//}}AFX_MSG_MAP Bc2PF;n
END_MESSAGE_MAP()
p(Bn!
|p{FSS
BOOL CCaptureDlg::OnInitDialog() \ .jT"Z~
{ &li&P5!i
CDialog::OnInitDialog(); ,c'a+NQ_t
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ](H
vx
ASSERT(IDM_ABOUTBOX < 0xF000); @Xe[5T
CMenu* pSysMenu = GetSystemMenu(FALSE); R^F\2yth-
if (pSysMenu != NULL) WL5!H.q
{ D^W?~7e^r
CString strAboutMenu; I@9k+JB
strAboutMenu.LoadString(IDS_ABOUTBOX); OM
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if (!strAboutMenu.IsEmpty()) haMt2S2_B:
{ za@`,Yq
pSysMenu->AppendMenu(MF_SEPARATOR); {BKr/) H
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); H&zhYKw
} 9oA.!4q
} XDi[Iyj
SetIcon(m_hIcon, TRUE); // Set big icon ZICcZG_y
SetIcon(m_hIcon, FALSE); // Set small icon {,rVA(I@
m_Key.SetCurSel(0); Nm]\0m0p-
RegisterHotkey(); fr<, LC.
CMenu* pMenu=GetSystemMenu(FALSE); 9K
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pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $di8#O*
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S\O6B1<:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O<v9i4*
return TRUE; // return TRUE unless you set the focus to a control SRx `m,535
} 3xnu SOdh
|k^ *
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (j;6}@
{ " |l-NUe
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,:QDl
{ BnLWC
CAboutDlg dlgAbout; N2^B
dlgAbout.DoModal(); ;{Kx$Yt+
} i%)Nn^a;T
else ?5L.]Isa5
{ [1*3 kt*h
CDialog::OnSysCommand(nID, lParam); W!BIz&SY:-
} JH0L^p
} W} U-u{Z
W+0VrH
0F
void CCaptureDlg::OnPaint() e-#!3j!'
{ ^l\^\>8
if (IsIconic()) 8+<vumnw
{ e.|_=Gd2/
CPaintDC dc(this); // device context for painting Sy<s/x^`
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4W''j[Y/
// Center icon in client rectangle ,,>b=r_r&
int cxIcon = GetSystemMetrics(SM_CXICON); V5{^R+_)Ya
int cyIcon = GetSystemMetrics(SM_CYICON); 8Dq;QH}
CRect rect; 0FV?By
GetClientRect(&rect); %CP:rAd`M.
int x = (rect.Width() - cxIcon + 1) / 2; \VX~'pkrd/
int y = (rect.Height() - cyIcon + 1) / 2; &m6x*i-5\f
// Draw the icon 75V?K
dc.DrawIcon(x, y, m_hIcon); >9.xFiq<
} fscAG\>8
else ~D)!zQkD
{ $3Ct@}=n
CDialog::OnPaint(); I(dMiL
} bNG;`VZ%
} ~agzp`!M
)c#m<_^
HCURSOR CCaptureDlg::OnQueryDragIcon() f:h.O# d>
{ tzhkdG
return (HCURSOR) m_hIcon; TKsze]/q
} Uaho.(_GP
t-$R)vZ}M
void CCaptureDlg::OnCancel() #~r+
{ jyt#C7mj-A
if(bTray) )k8=< =s
DeleteIcon(); lnFOD+y9
CDialog::OnCancel(); ~\%MJ3
} #w4=kWJ[
u,e(5LU
void CCaptureDlg::OnAbout() v^h
\E+@
{ P/'~&*m-
CAboutDlg dlg; l*|^mx^Q
dlg.DoModal(); Gw$sL&1m\
} @JWoF^U
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void CCaptureDlg::OnBrowse() [*j
C
{ yuvt<kz
CString str; ;u'mSJI'
BROWSEINFO bi; tZ]|3wp
char name[MAX_PATH]; >Udb*76
D
ZeroMemory(&bi,sizeof(BROWSEINFO)); ~R]E=/ m|
bi.hwndOwner=GetSafeHwnd(); {Tp0#fi
bi.pszDisplayName=name; p0xd
c3
bi.lpszTitle="Select folder"; tj ,*-).4%
bi.ulFlags=BIF_RETURNONLYFSDIRS; Eg"DiI)7
LPITEMIDLIST idl=SHBrowseForFolder(&bi); aPq9^S*
if(idl==NULL) ai(<"|(
return; U/2g N
H
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]Ph~-O
str.ReleaseBuffer(); eiJO;%fl>l
m_Path=str; U-ILzK
if(str.GetAt(str.GetLength()-1)!='\\') Oph4&Ip[w
m_Path+="\\"; 6EhRCl
UpdateData(FALSE); Ek +L"7
} -~A7o3k35
~EIY(^|py
void CCaptureDlg::SaveBmp() &X
+Qi
{ @+VvZc2Y
CDC dc; _M+'30
dc.CreateDC("DISPLAY",NULL,NULL,NULL); x=yU
}lsV
CBitmap bm; x-0IxWD%
int Width=GetSystemMetrics(SM_CXSCREEN); \#[W8k<Z
int Height=GetSystemMetrics(SM_CYSCREEN); )>atoA
bm.CreateCompatibleBitmap(&dc,Width,Height); EdA_Hf
CDC tdc; #dDsI]E)
tdc.CreateCompatibleDC(&dc); ~(tZW
CBitmap*pOld=tdc.SelectObject(&bm); K h9 $
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :z^ps0
tdc.SelectObject(pOld); 5#.uA_Fov
BITMAP btm; 2,O-/A;tW*
bm.GetBitmap(&btm); TR,,=3n
DWORD size=btm.bmWidthBytes*btm.bmHeight; J_s?e#s
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =z]&E 78Y
BITMAPINFOHEADER bih; K,[g<7X5
bih.biBitCount=btm.bmBitsPixel; 2*Uwp;0
bih.biClrImportant=0; O`O{n_o^u
bih.biClrUsed=0; aC>r5b#:
bih.biCompression=0; #D3e\(
bih.biHeight=btm.bmHeight; .9Bimhc6K
bih.biPlanes=1; e0HG"z4
bih.biSize=sizeof(BITMAPINFOHEADER); PKR0y%Ar
bih.biSizeImage=size; "_ b
Sy
bih.biWidth=btm.bmWidth; v#.FK:u}
bih.biXPelsPerMeter=0; *$x/(!UE
bih.biYPelsPerMeter=0; D>,]EE-
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !Y-MUZ$f
static int filecount=0; kwdmw_
CString name; V-CPq
name.Format("pict%04d.bmp",filecount++); !W/O g 5n
name=m_Path+name; $Trkow%F]
BITMAPFILEHEADER bfh; =1lKcA[z
bfh.bfReserved1=bfh.bfReserved2=0; g/so3F%v
.
bfh.bfType=((WORD)('M'<< 8)|'B'); D5)qmu
bfh.bfSize=54+size; 6g!#"=ls;
bfh.bfOffBits=54; R:B-4
CFile bf; mSAuS)YD
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8Uvf9,I'
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,JT|E~P?8
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k+44ud.j
bf.WriteHuge(lpData,size); ={b/s31H:
bf.Close(); #$%9XD3
nCount++; 0\wMlV`F
} ;)[RG\
GlobalFreePtr(lpData); .G1NY1\
if(nCount==1) $Vbgfp~U-
m_Number.Format("%d picture captured.",nCount); 673v
else _%!C;`3Y
m_Number.Format("%d pictures captured.",nCount); F8YD:
UpdateData(FALSE); uJMF\G=nb
} $Ha?:jSc
gE JmMh
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m:/@DZ
{ "j3Yu4_ks
if(pMsg -> message == WM_KEYDOWN) |Wj)kr !|
{ SxC$EQgL
if(pMsg -> wParam == VK_ESCAPE) $I-$X?
return TRUE; ExI?UGT
if(pMsg -> wParam == VK_RETURN) 3j0/&ON
return TRUE; @g[p>t> *
} &529.>
return CDialog::PreTranslateMessage(pMsg); VZF/2d84&w
} 2Y&z}4'j
eg)=^b
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }_0?S0<#
{ 9M~EH?>+[
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ S
D]d/|y
SaveBmp(); IoJkM-^H&)
return FALSE; 'Y6{89 y
} Kom$i<O?48
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -hL8z$}
CMenu pop; 5|xFY/%
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6<NaME
CMenu*pMenu=pop.GetSubMenu(0); 29u"\f a
pMenu->SetDefaultItem(ID_EXITICON); $WnK
CPoint pt; #@Zz
Bf
GetCursorPos(&pt); B[C2uVEX:
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G?e,Q$
if(id==ID_EXITICON) q+dY&4&u
DeleteIcon(); H]"Z_n_
else if(id==ID_EXIT) }@4m@_gR?
OnCancel(); B c*Rn3i@
return FALSE; j)C%zzBu(
} XV)ej>A-V
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t3 *2Z u
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Hy|$7]1
AddIcon(); %S$`cp
return res; R8Lp8!F'
} iYHD:cg)~
HV&N(;@
void CCaptureDlg::AddIcon() k x6%5%
{ `BMg\2Ud*
NOTIFYICONDATA data; w@X<</`
data.cbSize=sizeof(NOTIFYICONDATA); ]XJpy-U
CString tip; U{h5uezD
tip.LoadString(IDS_ICONTIP); c%Yvj
data.hIcon=GetIcon(0); g$?B!!qT
data.hWnd=GetSafeHwnd(); s41<e"
strcpy(data.szTip,tip); wX#=l?,K
data.uCallbackMessage=IDM_SHELL; R"!.|fH6
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +=|Q'V
data.uID=98; L/<^uO1
Shell_NotifyIcon(NIM_ADD,&data); {08UBnR
ShowWindow(SW_HIDE); hBz~FB];&
bTray=TRUE; 9/{+,RpC
} ai`fP{WlX
.gv J;A7
void CCaptureDlg::DeleteIcon() ov#/v\|0
{ 4cr
>sz
NOTIFYICONDATA data; XkCbdb
data.cbSize=sizeof(NOTIFYICONDATA); P00d#6hPJ
data.hWnd=GetSafeHwnd(); tu6c!o,@
data.uID=98; z++*,2F
Shell_NotifyIcon(NIM_DELETE,&data); 8 ]dhNA5
ShowWindow(SW_SHOW); &y mfA{s
SetForegroundWindow(); t}qoIxy)
ShowWindow(SW_SHOWNORMAL); K4N~ApLB+
bTray=FALSE; 45edyQ
} |`U^+Nf
st|$Fu
void CCaptureDlg::OnChange() [}9R9G>"
{ '>`?T}a,
RegisterHotkey(); +T
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} 5X|=qZ
I^[R]Js
BOOL CCaptureDlg::RegisterHotkey() /o.wCy,J<
{ E[Tz%x=P
UpdateData(); HpSgGhL'J&
UCHAR mask=0; ]b.@i&M
UCHAR key=0; #|GP]`YT
if(m_bControl) z~A||@4'
mask|=4; 7sC$hm]
if(m_bAlt) &rorBD 5aj
mask|=2; `U#*O+S-^
if(m_bShift) (JocnM|U
mask|=1; VDx=Tsu-
key=Key_Table[m_Key.GetCurSel()]; C=h$8Q
if(bRegistered){ Dsm_T1X
DeleteHotkey(GetSafeHwnd(),cKey,cMask); )j4]Y dJ
bRegistered=FALSE; %8yfFrk
} ?Re@`f+*
cMask=mask; +Ys<V
cKey=key; ?c+_}ja,
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f/&Dy'OV7
return bRegistered; uwyzxj
} Ii,e=RG>
{|^9y]VFu
四、小结 Um4
} `
I6M 7xn
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。