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:
lu?:1V-
s&4&\Aq}x# 一、实现方法
_P`
^B T)I\?hqTB 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:
2lCgUe)N b/w5K2 #pragma data_seg("shareddata")
zIA)se
Js HHOOK hHook =NULL; //钩子句柄
3L CT-rp UINT nHookCount =0; //挂接的程序数目
L)n_
Q static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
| .gE9'"bv static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
``-pjD(t static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
\ iA'^69 static int KeyCount =0;
jL7r1pu5 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
D#D55X^6* #pragma data_seg()
#P1U]@ ^;9<7h[l 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。
/^L<q =)s~t|@v 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:
jqj4(J@%yr Uc,J+j0F BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
v5 @9 cKey,UCHAR cMask)
BM{*5Lf {
jLA)Y
[h BOOL bAdded=FALSE;
8(ot<3(D for(int index=0;index<MAX_KEY;index++){
6M
;lD5(> if(hCallWnd[index]==0){
?t/G@ hCallWnd[index]=hWnd;
`TYC]9 HotKey[index]=cKey;
1bFGoLAEFl HotKeyMask[index]=cMask;
?iZM.$![ bAdded=TRUE;
|)C
# KeyCount++;
H_JE)a:+ break;
gBO, }
ckb(+*+l }
lbX
YWZ~7 return bAdded;
Lq62 }
qg/FI#r //删除热键
Dkx}}E:< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BCuoFw) {
"L;@qCfhO BOOL bRemoved=FALSE;
%^d<go^ for(int index=0;index<MAX_KEY;index++){
=CW> ;h] if(hCallWnd[index]==hWnd){
MGf *+!y, if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+w7U7"
xQ hCallWnd[index]=NULL;
|2=@8_am HotKey[index]=0;
|@~_&g HotKeyMask[index]=0;
)Ii`/I^ bRemoved=TRUE;
fk9q 3 KeyCount--;
-G~/ GO break;
RU=\eD }
nLOK1@,4 }
X`3_ yeQc }
5NC77}^. return bRemoved;
PJ4/E }
l =t/"M= ,zuS)? "TP~TjXfq DLL中的钩子函数如下:
g!.piG| C>'G? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
+p`BoF9~ {
q{_ f" BOOL bProcessed=FALSE;
C4qK52'2s if(HC_ACTION==nCode)
spTz}p^\O {
+'Y?K]zbt if((lParam&0xc0000000)==0xc0000000){// 有键松开
5JEOLPS switch(wParam)
5rf Dm {
Td|u-9OM case VK_MENU:
Rc3!u^?u MaskBits&=~ALTBIT;
4x}U+1B break;
cIQbu#[@ case VK_CONTROL:
8AuE:=?,, MaskBits&=~CTRLBIT;
MGq\\hLD\- break;
]R>NmjAI case VK_SHIFT:
_BY+Tfol MaskBits&=~SHIFTBIT;
4Y}Nu break;
IdMwpru( default: //judge the key and send message
xY/F)JOeG break;
:iLRCK3C }
nW*cqM%+ for(int index=0;index<MAX_KEY;index++){
$)$r if(hCallWnd[index]==NULL)
^pH8'^n continue;
/qJC p![X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oc]:Ty {
ul~6zBKO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
H3*]}= bProcessed=TRUE;
V?'p E }
M>|ZBEK }
4F9!3[}qF }
D/Ok else if((lParam&0xc000ffff)==1){ //有键按下
M 87CP=yc switch(wParam)
?hGE[.(eh] {
=PQ4S2Q case VK_MENU:
3[y$$qXI MaskBits|=ALTBIT;
jl>TZ)4}V break;
Qu,R6G case VK_CONTROL:
+lfO4^V MaskBits|=CTRLBIT;
z?Ok'LX break;
|pv$],&&: case VK_SHIFT:
gKl9Nkd!R MaskBits|=SHIFTBIT;
Sgv_YoD?- break;
l*OR{!3H$ default: //judge the key and send message
S9r?= K break;
P9qIq]M }
I*^t!+q$ for(int index=0;index<MAX_KEY;index++){
[*5]NNB if(hCallWnd[index]==NULL)
8B &EH+ continue;
pDYJLh-C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[U",yN]d {
343d`FRa} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
DO* bProcessed=TRUE;
+v
3:\# }
Su7N ?X! }
LEeA ,Y }
i!}6FBZ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Axns for(int index=0;index<MAX_KEY;index++){
S<NK!89 if(hCallWnd[index]==NULL)
akt7rnt?i continue;
hrq% { !Z if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m7y[Y SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;5L^)Nyd //lParam的意义可看MSDN中WM_KEYDOWN部分
GC7 WRA }
qzJ<9H }
ZLxa|R7 }
.MG83Si return CallNextHookEx( hHook, nCode, wParam, lParam );
KUYwc@si\ }
=f
y|Dm74 ` 6*]c n#( 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:
J,) ytw] h2T\%V_j BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_J!&R:]$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2aCf?l( jk&xzJH. 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:
gN/>y1{a wEM=Tr/h LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
YPI,u7- {
qe#5;# if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
GJZjQH-#P {
bY.VNA //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
#@OPi6.#!< SaveBmp();
GW'v\O return FALSE;
+pme]V|< }
G\BZ^SwE …… //其它处理及默认处理
"r_wgl% }
J_Tz\bZ3) w-e{_R 3p&T?E% 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。
C{pOGc@ Z3hZy&_I 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。
_3@5@1[s x1#>"z7 二、编程步骤
7~QI4'e ur8+k4]\" 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";
5Y^"&h[/ ciN\SA ZY 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
h#O9TB |xcI~ X7Q 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;
El5} f4sl K2yNIq_ 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;
cbyzZ#WRb c?HUW 5、 添加代码,编译运行程序。
^@AyC"K -)oUb=Lk{ 三、程序代码
[ ,Go*r }' AY#g ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
; $80}TY ' #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
a24 AmoWx #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
bg-/
8, #if _MSC_VER > 1000
iBAP,cR?` #pragma once
z``wqK #endif // _MSC_VER > 1000
/m"/#; ^l #ifndef __AFXWIN_H__
<A)M^,#o #error include 'stdafx.h' before including this file for PCH
*PnO$q@` #endif
B F<u3p?? #include "resource.h" // main symbols
`"&Nw,C class CHookApp : public CWinApp
A_oZSUrR {
$xZ ~bE9 public:
Cn3_D CHookApp();
`L`+`B // Overrides
&;d
N:F; // ClassWizard generated virtual function overrides
gx9Os2Z|3 //{{AFX_VIRTUAL(CHookApp)
;C$+8%P4 public:
R\3a Sx L virtual BOOL InitInstance();
K#wA ; virtual int ExitInstance();
}psRgF //}}AFX_VIRTUAL
e9KD mX_ //{{AFX_MSG(CHookApp)
YP_L~zZ // NOTE - the ClassWizard will add and remove member functions here.
X%5eZ"1{x // DO NOT EDIT what you see in these blocks of generated code !
PtbaC6"\ //}}AFX_MSG
X n!mdR DECLARE_MESSAGE_MAP()
O[ird`/ };
- /\qGI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
;z4F-SYQ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
F,p0OL. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
lfcGi3 BOOL InitHotkey();
w7?fJ")
BOOL UnInit();
$C\ETQ@ #endif
qXW\/NT"p< pVy=rS- //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
0wv#AT #include "stdafx.h"
1}DA| !~ #include "hook.h"
mg'q-G`\< #include <windowsx.h>
c("|xe #ifdef _DEBUG
oM~y8O #define new DEBUG_NEW
jn V=giBu #undef THIS_FILE
|g 3:+& static char THIS_FILE[] = __FILE__;
b/z-W`gw #endif
ja_8n["z #define MAX_KEY 100
]WDmx$"&e #define CTRLBIT 0x04
^b+>r #define ALTBIT 0x02
RtMI[ #define SHIFTBIT 0x01
v<!S_7h #pragma data_seg("shareddata")
kKSGC?d HHOOK hHook =NULL;
xGwImF$r UINT nHookCount =0;
BUBx}dbCM static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
eTS}- static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}R['Zoh4I static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
[v"Z2F<.= static int KeyCount =0;
`3rwqcxA static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
~U]g;u #pragma data_seg()
;AEfU^[
HINSTANCE hins;
LBK{-(% void VerifyWindow();
2@zduL'do_ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Sf, z //{{AFX_MSG_MAP(CHookApp)
pD$4nH4KST // NOTE - the ClassWizard will add and remove mapping macros here.
Iy9hBAg\y // DO NOT EDIT what you see in these blocks of generated code!
c
3QgX4vq //}}AFX_MSG_MAP
VyxYv-$Y END_MESSAGE_MAP()
1XSnnkJm s7 "xDDV CHookApp::CHookApp()
x"12$ 79= {
:]-oo*xP // TODO: add construction code here,
sW]^YT>? // Place all significant initialization in InitInstance
-XV,r<'' }
+'?Qph6o,7 |
;tH?E CHookApp theApp;
/sKL|]i= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-&8( MT* {
&R72$H9C8i BOOL bProcessed=FALSE;
S:_Ms{S if(HC_ACTION==nCode)
YO7U}6wBt {
EJkHPn if((lParam&0xc0000000)==0xc0000000){// Key up
QO'Hyf t switch(wParam)
:X;G]B
. {
4qOzjEQ case VK_MENU:
!wy _3a MaskBits&=~ALTBIT;
i<Vc~!pT break;
m@2E ~m case VK_CONTROL:
\cIN]=# MaskBits&=~CTRLBIT;
b&z#ZY break;
lYx_8x2 case VK_SHIFT:
Zo3!Hs ZA MaskBits&=~SHIFTBIT;
;l@94)@0 break;
uks75W!}U default: //judge the key and send message
A>@#eyB break;
@YI{ E*?S }
>
{*cW for(int index=0;index<MAX_KEY;index++){
cfLF@LW!]) if(hCallWnd[index]==NULL)
aDbqh~7 continue;
S>yi D`v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r6m^~Wq!} {
}e[ E SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?,vLRq. bProcessed=TRUE;
?Z#N9Z~\ }
O sgPNy0 }
!Z!)$3bB }
*d1BpR% else if((lParam&0xc000ffff)==1){ //Key down
kt6x"'"1 switch(wParam)
_\WR3Q!V {
Dh
I{&$O/ case VK_MENU:
.G8`Ut Z MaskBits|=ALTBIT;
HbKE;N break;
v ccH(T case VK_CONTROL:
t%=7v)IOE MaskBits|=CTRLBIT;
nh} Xu~#_ break;
INg0[Lpc case VK_SHIFT:
sU_K^=6* MaskBits|=SHIFTBIT;
5PeS/%uT@ break;
;,4*uU'vq default: //judge the key and send message
}%< ?] break;
Dp'urf\*$ }
uC'-: t# for(int index=0;index<MAX_KEY;index++)
Ln&pe(c {
;sB=f if(hCallWnd[index]==NULL)
Th) continue;
5
D|#l*V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
DSrU7# {
Q
dj(D\. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
wNf:_^|} bProcessed=TRUE;
h[
. }
\((iR>^| }
dfDjOZSL }
m%HT)`>bg if(!bProcessed){
p*g Fr hm for(int index=0;index<MAX_KEY;index++){
02J/=AC5 if(hCallWnd[index]==NULL)
t;8)M$
p continue;
DzZF*ylQ5P if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
uF7vba$ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
t7Q$ }
=^9h
z3j }
-^@FZR^Y }
Y 6a`{' return CallNextHookEx( hHook, nCode, wParam, lParam );
MP%#)O6 }
'n &p5% ` ~GXK BOOL InitHotkey()
?WI v4 {
/vQ)$;xf# if(hHook!=NULL){
V}E['fzBFV nHookCount++;
o0H^J,6gV return TRUE;
X|of87 }
>^Nnhnr else
?%O>]s hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
km%r{ if(hHook!=NULL)
>F$9&s& nHookCount++;
pzF_g-B return (hHook!=NULL);
T\6Qr$t }
X`8<;l BOOL UnInit()
A(y6]E! {
1-kuK<KR if(nHookCount>1){
V3,C5KKk&z nHookCount--;
9jal D
X return TRUE;
Ia2WBs= }
e{)giJY9 BOOL unhooked = UnhookWindowsHookEx(hHook);
z|g2Q#$-\S if(unhooked==TRUE){
4 9qa nHookCount=0;
e@'x7Zzh hHook=NULL;
8FsQLeOE }
lu#a.41 return unhooked;
}z]d] }
UF9={fN1 M\1CDU+*Ns BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
g\aO:: {
+ai3 BOOL bAdded=FALSE;
N.|F8b]v for(int index=0;index<MAX_KEY;index++){
T8 FW(Gw# if(hCallWnd[index]==0){
_}{KS, f]0 hCallWnd[index]=hWnd;
l6'KIg HotKey[index]=cKey;
N_%@_$3G] HotKeyMask[index]=cMask;
}e7Rpgu bAdded=TRUE;
F/v.hP_ KeyCount++;
!r/i<~'Bx break;
%NLd"SV }
bb_elmb)n }
[v1$Lp return bAdded;
dDcQSshL }
&8VH m?h !)M}(I} BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pMU\f {
KXWcg#zFY BOOL bRemoved=FALSE;
[}L?EM for(int index=0;index<MAX_KEY;index++){
0:{W
t if(hCallWnd[index]==hWnd){
Bc=(1ty) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
M+t)#O4 hCallWnd[index]=NULL;
Zg+.`>z HotKey[index]=0;
igu1s}F HotKeyMask[index]=0;
{4+/0\ bRemoved=TRUE;
:!i=g+e] KeyCount--;
cS.@02~f" break;
5<Kt"5Z%7 }
?V`-z#y7 }
3W'fEh5 }
;MfqI/B{ return bRemoved;
}s2CND }
~}OaX+! J.iz%8 void VerifyWindow()
N XB8u6 {
4~
x>] for(int i=0;i<MAX_KEY;i++){
DgEdV4@p if(hCallWnd
!=NULL){ u>fs
yn9c
if(!IsWindow(hCallWnd)){ Sct
hCallWnd=NULL; 4K cEJlK5
HotKey=0; F=F84_+K
HotKeyMask=0; ww|fqx?
KeyCount--; ^!tX+`,6^
} T"\d,ug5[
} aT^
$'_ G
} |
.+P ;g
} bUgg2iFS
w5Fk#zJv
BOOL CHookApp::InitInstance() 5c5!\g~'
{ ;(K/O?nrJ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); \J:+Wl.9A
hins=AfxGetInstanceHandle(); smCACQ$(
InitHotkey(); gj;gl
="3
return CWinApp::InitInstance(); f@sC~A. 9\
} mxqZj8VuH
'@t,G,FJ
int CHookApp::ExitInstance() w/NT 5
{ _;}$/
VerifyWindow(); } W]A`-Jv
UnInit(); %@QxU-k_
return CWinApp::ExitInstance(); QFTiE1mGH
} iv`G}.Bo
0d[O/Q`
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #8jiz+1 _
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I=DVMG|
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ G)0
4'|W
#if _MSC_VER > 1000 L#`X
]E
#pragma once J@_M%eN
#endif // _MSC_VER > 1000 Qi\]='C
i~x]!!
class CCaptureDlg : public CDialog EG4~[5[YgI
{ `n,RC2yo
// Construction Gd!_9S`68
public: km>ZhsqD
BOOL bTray; H@- GYX"4
BOOL bRegistered; QXj #Brp
BOOL RegisterHotkey(); ~{DJ,(N"n
UCHAR cKey;
n\9IRuYO
UCHAR cMask; l&\y]ZV={
void DeleteIcon(); WG,Il/
void AddIcon(); .XpuD,^;@
UINT nCount; Xg.Lo2s
void SaveBmp(); x`?>j$
CCaptureDlg(CWnd* pParent = NULL); // standard constructor sssw(F
// Dialog Data &NF$_*\E
//{{AFX_DATA(CCaptureDlg) aVr(*s;/
enum { IDD = IDD_CAPTURE_DIALOG }; '(iPI
CComboBox m_Key; >~d'i
BOOL m_bControl; 5[2kk5,
BOOL m_bAlt; #2|biTJ
BOOL m_bShift; P}'B~~9W
CString m_Path; / 8O=3
CString m_Number; R?{_Q<17
//}}AFX_DATA tF[)Y#
// ClassWizard generated virtual function overrides m
+A4aQ9
//{{AFX_VIRTUAL(CCaptureDlg) 5XT^K)'
public: z81dm
virtual BOOL PreTranslateMessage(MSG* pMsg); Y4YZM
protected: $,Q]GIC
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x7B;\D#`i/
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "}
:CM_
//}}AFX_VIRTUAL WBKf)A^S
// Implementation YuuTLX%3
protected: ^coCsV^CW"
HICON m_hIcon; (Jb#'(~a
// Generated message map functions Ot.v%D`e 5
//{{AFX_MSG(CCaptureDlg) g
mWwlkf9
virtual BOOL OnInitDialog(); = y^5PjN
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r5[pT(XT]
afx_msg void OnPaint(); 8(ZQM01;
afx_msg HCURSOR OnQueryDragIcon(); !Th5x2
virtual void OnCancel(); bOU"s>?
afx_msg void OnAbout(); Sa)sDf1+`
afx_msg void OnBrowse(); _zbIS&4
afx_msg void OnChange(); /IcGJ&;
//}}AFX_MSG Q~.t8g/
DECLARE_MESSAGE_MAP() {zd[8TJ~xa
}; +DQUL|\
#endif r4cz?e|
o]V.6Ge-
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file z-3.%P2g
#include "stdafx.h" {tYY
_BI<
#include "Capture.h" )cL(()N
#include "CaptureDlg.h" +*Wlj8
#include <windowsx.h> lA4-ZQ2Zp[
#pragma comment(lib,"hook.lib") 6
o
#ifdef _DEBUG W.s8!KH:
#define new DEBUG_NEW erv94acq
#undef THIS_FILE nN.Gn+Cl
static char THIS_FILE[] = __FILE__; Yt =)=n
#endif Bi9Q8#lh
#define IDM_SHELL WM_USER+1 ObZhQ.&
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RFsUb:%V7-
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q'trd};xR
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L!Tvz(_7f6
class CAboutDlg : public CDialog 8wO4;
{ vr"Pr4z4i
public: &kvmLO I
CAboutDlg(); vx7=I\1
// Dialog Data AJ}m2EH
//{{AFX_DATA(CAboutDlg) BT}l"
enum { IDD = IDD_ABOUTBOX }; iM7^
//}}AFX_DATA o%-KO? YW
// ClassWizard generated virtual function overrides 0N)DHD?U
//{{AFX_VIRTUAL(CAboutDlg) T_s09Wl
protected: L9^M?.a
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &2%|?f|
//}}AFX_VIRTUAL izcjI.3e,
// Implementation [QMN0#(h
protected: "]2^O
//{{AFX_MSG(CAboutDlg) JXRU9`3)A
//}}AFX_MSG Y6Y"fb%K
DECLARE_MESSAGE_MAP() [So1`IA6
}; #:[F=2@,A
zC:Pg4=w]
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =mX26l`B
{ o=!_.lDF:
//{{AFX_DATA_INIT(CAboutDlg) >Mh\jt\
//}}AFX_DATA_INIT k(7Q\JKE
} :Hb`vH3x
/?
d)01
void CAboutDlg::DoDataExchange(CDataExchange* pDX) pdFO!A_t
{ |Wa.W0A
CDialog::DoDataExchange(pDX); 'Qg!ww7O
//{{AFX_DATA_MAP(CAboutDlg) g-!
//}}AFX_DATA_MAP i/C%
1<
} cGm?F,/`
[;yH.wn#5
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V=fh;p
//{{AFX_MSG_MAP(CAboutDlg) AB3OG*C9
// No message handlers sMVk]Mb
//}}AFX_MSG_MAP -Op^3WWyY
END_MESSAGE_MAP() jPo,mz&^
zp:QcL"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7*M-?
: CDialog(CCaptureDlg::IDD, pParent) _UZPQ[
{ RcJtVOrd
//{{AFX_DATA_INIT(CCaptureDlg) a {x3FQ
m_bControl = FALSE; ?zC{T*a
m_bAlt = FALSE;
SmDNN^GR
m_bShift = FALSE; /zXOtaG
m_Path = _T("c:\\"); nC[aEZ7
m_Number = _T("0 picture captured."); /9gn)q2f(
nCount=0; 8PVjNS/
bRegistered=FALSE; \}4*}Lr
bTray=FALSE; \ `z%5/@f;
//}}AFX_DATA_INIT 9MO=f^f-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 S,5>/'fy0
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2[(~_VJ
} WK?5`|1l:x
3O-vO=D
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nql9SQ'\\
{ oR~d<^z(
CDialog::DoDataExchange(pDX); K/Pw;{}
//{{AFX_DATA_MAP(CCaptureDlg) xDl;
tFI
DDX_Control(pDX, IDC_KEY, m_Key); &uc`w{,Zs
DDX_Check(pDX, IDC_CONTROL, m_bControl);
dG0z A
D
DDX_Check(pDX, IDC_ALT, m_bAlt); NZZy^p&O
DDX_Check(pDX, IDC_SHIFT, m_bShift); M:oM(K+
DDX_Text(pDX, IDC_PATH, m_Path); $kN=45SR
DDX_Text(pDX, IDC_NUMBER, m_Number); =NY55t.
//}}AFX_DATA_MAP hi$AZ+
} ^>ir&$
ia_@fQ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \\13n4fAv
//{{AFX_MSG_MAP(CCaptureDlg) DrioBb@
ON_WM_SYSCOMMAND() G9Kck|50
ON_WM_PAINT() uxDM
#
ON_WM_QUERYDRAGICON() -G/qfd|s/
ON_BN_CLICKED(ID_ABOUT, OnAbout) Fx.Ly]L
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) t_!p({
ON_BN_CLICKED(ID_CHANGE, OnChange) `C|];mf(#
//}}AFX_MSG_MAP KiI+ V;o
END_MESSAGE_MAP() o9sPyY$aQ
R ai
04
BOOL CCaptureDlg::OnInitDialog() z7sDaZL?_
{ z k}AGw
CDialog::OnInitDialog(); j%y{d(Q4
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); g"|>^90
ASSERT(IDM_ABOUTBOX < 0xF000); N>*+Wg$Ne
CMenu* pSysMenu = GetSystemMenu(FALSE); U/kQw rM
if (pSysMenu != NULL) zdU46|!u
{ 6@8t>"}
CString strAboutMenu; O<V 4j,
strAboutMenu.LoadString(IDS_ABOUTBOX); w< Xwz`O
if (!strAboutMenu.IsEmpty()) T^`; wD
{ [PUu9rz#
pSysMenu->AppendMenu(MF_SEPARATOR); lqMr@
:t
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6i+,/vr
} -3)jUzD
} o<3$|`S&
SetIcon(m_hIcon, TRUE); // Set big icon $Z;/Sh
SetIcon(m_hIcon, FALSE); // Set small icon pw4^E|X
m_Key.SetCurSel(0); itirh"[
RegisterHotkey(); ,>b>I#{
CMenu* pMenu=GetSystemMenu(FALSE); 1d FuoX
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8 I_
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "|1iz2L
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7M7Ir\d0lp
return TRUE; // return TRUE unless you set the focus to a control IKPGqoM
} S :}"gwFM
mgVYKZWL-i
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $57b.+2n
{ p$|7T31 *
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6*>Lud
{ @j}%{Km]Y
CAboutDlg dlgAbout; m#8PX$_
dlgAbout.DoModal(); ;9h;oB@
} %EVgS F!r
else D@68_sn
{ O8bxd6xb
CDialog::OnSysCommand(nID, lParam); w5%i
} =HsE:@
} Q*%}w_D6f
kUS]g
r~i
void CCaptureDlg::OnPaint() `q<W %'Tb$
{ LYRpd
if (IsIconic()) HBOyiIm Q
{ D%yY&q;
CPaintDC dc(this); // device context for painting bz#]>RD
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r
<5}& B`
// Center icon in client rectangle 1VM2CgR a
int cxIcon = GetSystemMetrics(SM_CXICON); 9!uiQ
int cyIcon = GetSystemMetrics(SM_CYICON); kq5X<'MM9N
CRect rect; P* `*^r3
GetClientRect(&rect); 1,;X4/*
int x = (rect.Width() - cxIcon + 1) / 2; jmkOu5@
int y = (rect.Height() - cyIcon + 1) / 2; dV'EiNpf
// Draw the icon *QiQ,~Ep
dc.DrawIcon(x, y, m_hIcon); rfEWh
Vy(}
} -GCo`PR?b
else / 'qoKof
{ 9)'f)60^
CDialog::OnPaint(); Q7XOO3<):
} wTa u.Bo
} ]n|Jc_Y
m:?"|.]
HCURSOR CCaptureDlg::OnQueryDragIcon() (XVBH1p"
{ \/Mx|7<
return (HCURSOR) m_hIcon; ,oA<xP-*
} esnq/
6ABK)m-y
void CCaptureDlg::OnCancel() :+PE1=v
{ ={ms@/e/T
if(bTray) (n*:LS=0
DeleteIcon(); p8!T)
?|
CDialog::OnCancel(); A'KH_])
} \|S!g_30m
[|KvlOvP
void CCaptureDlg::OnAbout() ?PT>V,&
{ @ps(3~?7
CAboutDlg dlg; {jz`K1
dlg.DoModal(); G7nhUg
} [ncK+rGAc
qy3@>
1G
void CCaptureDlg::OnBrowse() rtj`FH??11
{ \]u;NbC]
CString str; ]oB~8d
BROWSEINFO bi; ;Nj9,Va(t
char name[MAX_PATH]; 22CET9iCe
ZeroMemory(&bi,sizeof(BROWSEINFO)); kJ_8|
bi.hwndOwner=GetSafeHwnd(); [Vo5$w
bi.pszDisplayName=name; "ntP92 8
bi.lpszTitle="Select folder"; $mn0I69
bi.ulFlags=BIF_RETURNONLYFSDIRS; 7pyzPc#_
LPITEMIDLIST idl=SHBrowseForFolder(&bi); !=YKfzE
if(idl==NULL) fu^W# "{
return; BHUI1y5t
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A#=TR_@:
str.ReleaseBuffer(); <:}nd:l1
m_Path=str; H3D<"4Q>
if(str.GetAt(str.GetLength()-1)!='\\') XnQR(r)pR2
m_Path+="\\";
-BSdrP|
UpdateData(FALSE); Oo|PZ_P
} Ur(R[*2bx
r0XEB,}
void CCaptureDlg::SaveBmp() 2jFuF71
{ u
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CDC dc; }xk(aM_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); G@k]rwub
CBitmap bm; Dw%'u'HG
int Width=GetSystemMetrics(SM_CXSCREEN); 43PLURay
int Height=GetSystemMetrics(SM_CYSCREEN); u=.8M`FxP
bm.CreateCompatibleBitmap(&dc,Width,Height); "B_3<RSL
CDC tdc; zsg\|=P
tdc.CreateCompatibleDC(&dc); @KQ.t F*
CBitmap*pOld=tdc.SelectObject(&bm); gJ
\6cZD
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); SMX]JZmH
tdc.SelectObject(pOld); N,Eap KG
BITMAP btm; mn/)_1',
bm.GetBitmap(&btm); +i&<`ov
DWORD size=btm.bmWidthBytes*btm.bmHeight; Q 7_5
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); J-v1"7[2GC
BITMAPINFOHEADER bih; XMrk2]_
bih.biBitCount=btm.bmBitsPixel; U)/.wa>
bih.biClrImportant=0; <.6rl
bih.biClrUsed=0; JLoF!MK}
bih.biCompression=0; %f;dn<m=c
bih.biHeight=btm.bmHeight; ;Bs~E
bih.biPlanes=1; C`[<6>&y
bih.biSize=sizeof(BITMAPINFOHEADER); 8:,($a/KF
bih.biSizeImage=size; kFn/dQ4|
bih.biWidth=btm.bmWidth; V*giF`gq
bih.biXPelsPerMeter=0; Q/+`9z+c
bih.biYPelsPerMeter=0; Dr3_MWJ+
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,vR?iNd:q[
static int filecount=0; 8 "l
PiW3
CString name; m\6/:~qWW
name.Format("pict%04d.bmp",filecount++); }/cReX,so
name=m_Path+name; h'y%TOob
BITMAPFILEHEADER bfh; X-c|jn7
bfh.bfReserved1=bfh.bfReserved2=0; ubcB<=xb
bfh.bfType=((WORD)('M'<< 8)|'B'); g+ c*VmY
bfh.bfSize=54+size; ^65I,Z"
bfh.bfOffBits=54; O3} JOv_
CFile bf; EwC]%BZP
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?QOU9"@+B
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `q?3ux
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }
oPO`
bf.WriteHuge(lpData,size); qjB:6Jq4q
bf.Close(); #-0e0
nCount++; 3p%e_?
} pU$k{^'UK
GlobalFreePtr(lpData); sQJ\{'g
if(nCount==1) ]r
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m_Number.Format("%d picture captured.",nCount); YOl$sgg}
else X1Yw=t~a
m_Number.Format("%d pictures captured.",nCount); gP2zDI
UpdateData(FALSE); tT}b_r7h(1
} jn<?,UABD
uX_H;,n
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w% %q/![uy
{ ~g{j)"1
if(pMsg -> message == WM_KEYDOWN) *~vB6V|1
{ Er;/zxg9p
if(pMsg -> wParam == VK_ESCAPE) l0qaTpn
return TRUE;
/8x';hQ
if(pMsg -> wParam == VK_RETURN) OQ-)
4Uk}
return TRUE; 8q^}AT<C
} dli(ckr
return CDialog::PreTranslateMessage(pMsg); (` *BZ_
} 1'~Xn
4
f
#Rw!a#CX.
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a-{|/
n%
{ ingG
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {VcRur}&Y8
SaveBmp(); =zkN63S
return FALSE; -DI
>O/
} GX>8B:]o|
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (95|DCL
CMenu pop; #T=iS(i
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Tagf7tw4
CMenu*pMenu=pop.GetSubMenu(0); 'C]w3Rh'
pMenu->SetDefaultItem(ID_EXITICON); xl&@g)Jj
CPoint pt; EXDDUqZ5\
GetCursorPos(&pt); L&p R#
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CX|W$b)%
if(id==ID_EXITICON) 1oQw)X
DeleteIcon(); /<rvaR
else if(id==ID_EXIT) J"`VA_[
OnCancel(); @<\oM]jX
return FALSE; bMO^}qR`
} _Mw3>GNl
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D2$9$xeR
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UB$}`39@
AddIcon(); j-<-!jTd
return res; O_FB^BB
} Nk'<*;e
4MgN
void CCaptureDlg::AddIcon() 5vx 4F f
{ msl.{
NOTIFYICONDATA data; W A/dt2D|
data.cbSize=sizeof(NOTIFYICONDATA); A@A8xn%
CString tip; ;uBGB
h<
tip.LoadString(IDS_ICONTIP); w1/QnV
data.hIcon=GetIcon(0); oD2:19M@p
data.hWnd=GetSafeHwnd(); _{[6hf4p
strcpy(data.szTip,tip); 6}"%>9
data.uCallbackMessage=IDM_SHELL; )+_Vx}O:}
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qG9a!sj
data.uID=98; KF%BX~80C
Shell_NotifyIcon(NIM_ADD,&data); y;b#qUd5a
ShowWindow(SW_HIDE); m#_BF#
bTray=TRUE; $qNF /rF
} IiPX`V>RC
[\8rh^LFi
void CCaptureDlg::DeleteIcon() VGS%U8;
{ L!}!k N:?
NOTIFYICONDATA data; <ToS&
data.cbSize=sizeof(NOTIFYICONDATA); B/agW
data.hWnd=GetSafeHwnd(); cY?|RXNmZ
data.uID=98; p6DI7<C<H
Shell_NotifyIcon(NIM_DELETE,&data); zMSwU]4I!
ShowWindow(SW_SHOW); R{g=
N%O
SetForegroundWindow(); ;K<VT\
ShowWindow(SW_SHOWNORMAL); wm5&5F4:
bTray=FALSE; I}`pY3
} )N.3Q1g-
x@NfN*?/+i
void CCaptureDlg::OnChange() .p[uIRd`
{ Kb; *"@LX
RegisterHotkey(); WtOjPW
} g}_2T\$k
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BOOL CCaptureDlg::RegisterHotkey() Z(MZbzY7Hq
{ CFpBosoFt^
UpdateData(); j.=:S;
UCHAR mask=0; 9Yt|Wj
UCHAR key=0; '2lV(>"
if(m_bControl) yYz{*hq
mask|=4; |`T7}U
if(m_bAlt) -.D?Z8e
mask|=2; v=k+MvX
if(m_bShift) i}m'#b
mask|=1; d{fd5jv;
key=Key_Table[m_Key.GetCurSel()]; lR?y
tIY
if(bRegistered){ !tq]kKJ3:
DeleteHotkey(GetSafeHwnd(),cKey,cMask); &y?
|$p\;/
bRegistered=FALSE; :8yebOs
} IdmP!(u
cMask=mask; ![z2]L+TB
cKey=key; R27'00(Z0
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `l|Oj$
return bRegistered; oCT,v 0+4O
} e$9a9twl
L^qCE-[
四、小结 ,^9+G"H:I
PzJ(Q
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。