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:
Dy6uWv,P
M
S
3?#b 一、实现方法
+Go(yS :$k':0 n 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
=B4,H=7Spf HUqG)t*c1 #pragma data_seg("shareddata")
OQzJRu)mF# HHOOK hHook =NULL; //钩子句柄
X"WKgC g$ UINT nHookCount =0; //挂接的程序数目
T=r-6eN static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
/2}o:vLj static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
1HQh%dZZ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
?#8',: static int KeyCount =0;
O@JgVdgf static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Y g>W.wA #pragma data_seg()
gXr"],OM; H.-jBFt} 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。
~RcI+jR) @X`~r8& 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:
b3(pRg[Fp C!Cg.^; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
k.bzh. cKey,UCHAR cMask)
v*Tliw`-U {
u I$|M BOOL bAdded=FALSE;
/ hUuQDJ for(int index=0;index<MAX_KEY;index++){
$=dp) if(hCallWnd[index]==0){
2|'v[ hCallWnd[index]=hWnd;
WrK!]17or HotKey[index]=cKey;
rZRcy9$y> HotKeyMask[index]=cMask;
NGYliP,.6 bAdded=TRUE;
5dffFe KeyCount++;
aE}1~` break;
;>^oe:@ }
R=M"g|U6 }
0kN;SSX! return bAdded;
a<X8l^Ln }
blxAy //删除热键
4d&#NP BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{FzL@!|| {
#_yQv? J BOOL bRemoved=FALSE;
rfqw/o for(int index=0;index<MAX_KEY;index++){
Gvo(iOU if(hCallWnd[index]==hWnd){
`5 py6, if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(]7*Kq hCallWnd[index]=NULL;
d,=Kv HotKey[index]=0;
/lAB HotKeyMask[index]=0;
>)ZX
bRemoved=TRUE;
=`2nv0%2 KeyCount--;
~;St,Fw<< break;
+EJwWDJ!% }
#PnuR2s7. }
(]wi^dE }
}.Eq_wP< return bRemoved;
3L/qU^` }
H5t 9Mg| (H *-b4]/ 216+ tX5Z DLL中的钩子函数如下:
8r[ZGUV
;/i"W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
vQrce& {
pAS!;t=n, BOOL bProcessed=FALSE;
9xWC<i if(HC_ACTION==nCode)
xsK{nM6g {
%bf+Y7m if((lParam&0xc0000000)==0xc0000000){// 有键松开
TJ(P TB; switch(wParam)
`x:znp} ' {
qh
Ezv~ case VK_MENU:
A^7!:^%K MaskBits&=~ALTBIT;
YArNJ5z= break;
x4v@Kk/ case VK_CONTROL:
N[4v6GS MaskBits&=~CTRLBIT;
\~xI#S@ break;
51yIW* case VK_SHIFT:
"sLdkd}dj MaskBits&=~SHIFTBIT;
={' "ATX(U break;
~XGO^P"? default: //judge the key and send message
'^ '4C'J break;
1@IRx{v$ }
j`^':! for(int index=0;index<MAX_KEY;index++){
"^-U#f>k if(hCallWnd[index]==NULL)
M9Gs^ continue;
3nuf3) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5zJkPki {
)
Kfk\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
<B6@q4Q bProcessed=TRUE;
${'gyD }
ln.kEhQ3B }
8D]:>[|E }
r`u}n else if((lParam&0xc000ffff)==1){ //有键按下
rUfW0 switch(wParam)
sh.xp8^)^> {
:1u>T3L.z case VK_MENU:
ga#,42)H MaskBits|=ALTBIT;
,CW]d#P| break;
o
D; case VK_CONTROL:
`;fh<kv MaskBits|=CTRLBIT;
PK1j$&F break;
BmYU#h case VK_SHIFT:
8)/i\=N3; MaskBits|=SHIFTBIT;
GkMNV7"m break;
gd<8RVA default: //judge the key and send message
oTZ?x}Z1 break;
hZnT`!iFE^ }
-Nmf}`_ for(int index=0;index<MAX_KEY;index++){
=fMSmn1S if(hCallWnd[index]==NULL)
O{8"f\* continue;
^)N[x''a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^&<~6y}U^ {
~\dpD SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>_M}l@1 bProcessed=TRUE;
\Ekez~k{` }
Qu]0BVIe }
43rM?_72 }
H%7V)" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
IWu^a w for(int index=0;index<MAX_KEY;index++){
[rqe;00] if(hCallWnd[index]==NULL)
&Pxt6M\d continue;
i=_leC)rl if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/Nq!^= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~J2-B2S! //lParam的意义可看MSDN中WM_KEYDOWN部分
322W"qduTZ }
^7q=E@[e }
!mBsDn(J }
n ! qm return CallNextHookEx( hHook, nCode, wParam, lParam );
$N;!. 5lX3 }
&n<jpMB |Ix6D 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
x$CpUy{6 V2es.I BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
:{4G=UbAI BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
G_5sF|(mq OxElvbM# 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:
+C;ZO6%w q" wi.&| LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
!|_
CXm
T| {
y- k?_$M if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
7^sU/3z {
w|WZEu:0| //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^a; V-US SaveBmp();
V$
38 return FALSE;
*wt yyP@
}
/iif@5lw{ …… //其它处理及默认处理
+Smv<^bW }
B2d$!Any > 0 !J]gK 4\pA^%73 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
d1e'!y}R5 w%S<N 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
5K'EuI) 7i{Rn K6* 二、编程步骤
@usQ*k P},S[GaZ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
%fP^Fh }#!o^B8 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
v ;MI*!E -Kg@Sj/U}R 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
'lC"wP&$ '5ky< 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|0Q\<mEe Y@eHp-[ 5、 添加代码,编译运行程序。
H[@}ri< ^S ,E "Q 三、程序代码
&4*&L.hPM^ CcY.8|HT ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
%>I!mD"X\ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
!P@u4FCs #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
yfTnj:Fz #if _MSC_VER > 1000
n_Um)GI> #pragma once
lNsPwyCoj #endif // _MSC_VER > 1000
EfDo%H^!j #ifndef __AFXWIN_H__
y=h2_jt #error include 'stdafx.h' before including this file for PCH
vCH>Fj"7 #endif
q,nj|9z V #include "resource.h" // main symbols
gEKJrAA class CHookApp : public CWinApp
"]c:V4S#`A {
S-2xe?sb public:
?[!.TU?4N CHookApp();
)2S0OY. // Overrides
Jr17pu(t // ClassWizard generated virtual function overrides
4n3QW%# //{{AFX_VIRTUAL(CHookApp)
JS(KCY 9 public:
YD@V2gK virtual BOOL InitInstance();
&tMvs<q, virtual int ExitInstance();
@1n0<V/ //}}AFX_VIRTUAL
VPN@q<BV //{{AFX_MSG(CHookApp)
@2$PU{dH // NOTE - the ClassWizard will add and remove member functions here.
[-6j4D // DO NOT EDIT what you see in these blocks of generated code !
qgZ(o@\ //}}AFX_MSG
h(/|` DECLARE_MESSAGE_MAP()
](MXP,R };
@Jm$<E LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
fvit+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
oPa2GW8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*qOo,e BOOL InitHotkey();
d1y(Jt BOOL UnInit();
8.k"kXU@n #endif
J=zZGd% GQF7]j/ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
?9?0M A<[i #include "stdafx.h"
X0vkdNgW #include "hook.h"
DVSYH{U4 #include <windowsx.h>
SNK+U"Q #ifdef _DEBUG
2#+@bk>^{ #define new DEBUG_NEW
xmiF!R #undef THIS_FILE
uU5:,Wy+dg static char THIS_FILE[] = __FILE__;
&<_sXHg<x #endif
EXJ>Z #define MAX_KEY 100
?5B}ZMW #define CTRLBIT 0x04
}1R k]$XC #define ALTBIT 0x02
{ +C>^b #define SHIFTBIT 0x01
I5x/N. #pragma data_seg("shareddata")
&7@6Y{!/
HHOOK hHook =NULL;
?Fi-,4 UINT nHookCount =0;
@Wx_4LOhf static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
TqQ>\h"&_ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
0eQ5LG?) static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
ORtl~V' static int KeyCount =0;
:~T:&;q0 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
uL-i>!"L!} #pragma data_seg()
Hlz4f+#I HINSTANCE hins;
+ !_^MB kk void VerifyWindow();
:eIBK BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
!5A
nr //{{AFX_MSG_MAP(CHookApp)
v0$6@K;M4G // NOTE - the ClassWizard will add and remove mapping macros here.
; $y.+5 q // DO NOT EDIT what you see in these blocks of generated code!
:nwcO3~` //}}AFX_MSG_MAP
G uDus2#+ END_MESSAGE_MAP()
+,|-4U@dl Wb4sfP_ CHookApp::CHookApp()
d9Q%GG0] {
/AMtT%91 // TODO: add construction code here,
5lU`o // Place all significant initialization in InitInstance
!/jx4w~R }
9 l,Gd p^L6uM CHookApp theApp;
m2_&rjGz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^1Yx'ua' {
{.!:T+'Xi\ BOOL bProcessed=FALSE;
bM-Y4[ if(HC_ACTION==nCode)
}*R"yp {
>Mvt;'c if((lParam&0xc0000000)==0xc0000000){// Key up
^2mXXAQf7^ switch(wParam)
gcv,]v8 {
N}dJ)<(2~ case VK_MENU:
P%/+?(? MaskBits&=~ALTBIT;
"V9!srIC break;
zZf#E@=$| case VK_CONTROL:
!o.g2 MaskBits&=~CTRLBIT;
MnX2sX| break;
^ g4)aaBZ case VK_SHIFT:
Y^6=_^ MaskBits&=~SHIFTBIT;
:_e.ch:4 break;
ax3:rl default: //judge the key and send message
MI@ RdXkY break;
zM@iG]?kc }
gH_r'j for(int index=0;index<MAX_KEY;index++){
+- .BF"} if(hCallWnd[index]==NULL)
,$}Q#q continue;
_aDx('
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<4O=[Q 5S {
Lqch~@E&%# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.
}=;]= bProcessed=TRUE;
Jx{,x-I }
X,OxvmDm }
%
tJ?dlD' }
X`aED\#\h else if((lParam&0xc000ffff)==1){ //Key down
.7kVC switch(wParam)
N7;E 2 X {
i5AhF\7F9 case VK_MENU:
-_314j=`/ MaskBits|=ALTBIT;
+QHhAA$ break;
>K
&b,o,[ case VK_CONTROL:
'.dW>7 MaskBits|=CTRLBIT;
t 1&p>
v break;
ar^`r!ABEh case VK_SHIFT:
pixI&iQ MaskBits|=SHIFTBIT;
' l!QGKz break;
SjJUhTb default: //judge the key and send message
I+<`} break;
*}v'y{; }
B[$SA-ZHi for(int index=0;index<MAX_KEY;index++)
Lte\;Se.tu {
qh&K{r*T if(hCallWnd[index]==NULL)
6Edqg continue;
)b-G2< kb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zh4o<f:- {
snK9']WXo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
A{c6XQR~z bProcessed=TRUE;
|j!D _j#U }
}YSH8d }
Qy$QOtrv }
-[7.VP if(!bProcessed){
p5[uVRZ for(int index=0;index<MAX_KEY;index++){
-!}1{ if(hCallWnd[index]==NULL)
?_^9e continue;
%idnm if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
5$#<z1M.& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,J~1~fg89 }
WI6er;D }
au7BqV!uL }
qMUqd}=P return CallNextHookEx( hHook, nCode, wParam, lParam );
g_x<+3a }
?3|ZS8y eU12*( BOOL InitHotkey()
)l"0:1I g {
L*l( ~t)vF if(hHook!=NULL){
V*TG%V - nHookCount++;
1rKR=To return TRUE;
L{Th>]X }
m2}&5vD8- else
%EpK=;51U hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
vx4&
;2 if(hHook!=NULL)
Hv=coS>g: nHookCount++;
\.{JS>! return (hHook!=NULL);
H}$#aXEAn }
"E8!{ BOOL UnInit()
_<~05Eh {
<AIsNqr if(nHookCount>1){
XmnqZWB nHookCount--;
dn5v|[ dJ return TRUE;
*\`C!r }
~ 52 BOOL unhooked = UnhookWindowsHookEx(hHook);
F+6ZD5/ if(unhooked==TRUE){
O3_Mrn(R nHookCount=0;
PQ[TTLG\& hHook=NULL;
X-duG*~ }
fg9sZ%67]\ return unhooked;
_I!Xr!!)a0 }
.dygp"* sDF J BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:vr,@1c {
CJC|%i3 BOOL bAdded=FALSE;
X}!_p& WI for(int index=0;index<MAX_KEY;index++){
b'&pJ1]]} if(hCallWnd[index]==0){
j NY8)w_ hCallWnd[index]=hWnd;
]@f6O*&= HotKey[index]=cKey;
i" )_M|
HotKeyMask[index]=cMask;
l?~ci
;lG bAdded=TRUE;
lz*PNT{E KeyCount++;
w iq{Jo# break;
}iC~B} }
:@/fy}! }
pqs)ueu return bAdded;
}/LYI }
I*ej_cFQ^ }n.h)Oz BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pta%%8": {
Za} |Ee BOOL bRemoved=FALSE;
m^=,
RfUUd for(int index=0;index<MAX_KEY;index++){
f4_\F/ if(hCallWnd[index]==hWnd){
izKk@{Md if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I45A$nV#Q hCallWnd[index]=NULL;
08f~vw" HotKey[index]=0;
1_t Dp&UO HotKeyMask[index]=0;
d;=,/a bRemoved=TRUE;
9j 8t<5s KeyCount--;
OBl8kH(b> break;
ZMe| fn }
3 x'30 }
T/K.'92S }
N!v@!z9Mu return bRemoved;
y((_V%F} }
!G,$:t1-=V ^Pf&C0xXv void VerifyWindow()
Fv: %"P^ {
h<M7[p= for(int i=0;i<MAX_KEY;i++){
98]t"ny [ if(hCallWnd
!=NULL){ 0
mQ3P.9
if(!IsWindow(hCallWnd)){ HB}gn2.1&
hCallWnd=NULL; $7r
wara
HotKey=0; `SW
" RLS3
HotKeyMask=0; KCFwO'
KeyCount--; mx[^LaR>v
} o`U\Nhq
} [E^X=+Jnz
} g-^m\>B
} Dmi;# WY
</Id';|v
BOOL CHookApp::InitInstance() n96gDH*
{ Fs|;>Up0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); YUb,5Y0
hins=AfxGetInstanceHandle(); L,Nr,QC-
InitHotkey(); z|<oxF.
return CWinApp::InitInstance(); ]Yu+M3Fq
} V[M#qZS
acZHb[w
int CHookApp::ExitInstance() l!y
_P
{ D5>~'N3b
VerifyWindow(); (0Qq rNs
UnInit(); !VHIl&Mos
return CWinApp::ExitInstance(); t/ 1NTa
} Fdw[CYHz
,OCTm%6e
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xdM#>z`;
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =Q}mJs
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ h %s
#if _MSC_VER > 1000 h6e$$-_
#pragma once )r i3ds
#endif // _MSC_VER > 1000 713M4CtJ
qlJOb}$ I
class CCaptureDlg : public CDialog lnWiE}F
{ [8P2V
// Construction +E~`H^
public: Z
~9N
BOOL bTray; PoJyWC
BOOL bRegistered; 5ecz'eA%
BOOL RegisterHotkey(); }tZAU\z
UCHAR cKey; N)*e^Nfb
UCHAR cMask; +-\9'Q
void DeleteIcon(); P`
F'Nf2U
void AddIcon(); ;QQ7vo
UINT nCount; 5#)<rK
void SaveBmp(); HdUW(FZ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor KL mB
// Dialog Data -C}59G8
//{{AFX_DATA(CCaptureDlg) BmFME0
enum { IDD = IDD_CAPTURE_DIALOG }; _ICDtG^
CComboBox m_Key; j~H`*R=ld#
BOOL m_bControl; `_A?a_[*
BOOL m_bAlt; PJ@ ,01
BOOL m_bShift; *UoHzaIqz
CString m_Path; ()#tR^T
CString m_Number; "3|"rc&F#
//}}AFX_DATA AV4HX\`{P0
// ClassWizard generated virtual function overrides cu^*x/0,
//{{AFX_VIRTUAL(CCaptureDlg) @!/fvP
public: 25n(&NV
virtual BOOL PreTranslateMessage(MSG* pMsg); /VO@>Hoh
protected: _0q~s@-
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8{fz0H.<?
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FqxOHovE
//}}AFX_VIRTUAL 1GE%5
// Implementation nj0AO0
protected: k3[h'.ps
HICON m_hIcon; } !<cph
// Generated message map functions w
a<C*o
//{{AFX_MSG(CCaptureDlg) {U '&9_y
virtual BOOL OnInitDialog(); %Dls36F
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2 `h!:0
afx_msg void OnPaint(); B;]5,`#!
afx_msg HCURSOR OnQueryDragIcon(); )UZ0gfx
virtual void OnCancel(); wLN2`ucC
afx_msg void OnAbout(); ZV]e-
afx_msg void OnBrowse(); ,(27p6!
afx_msg void OnChange(); ~!-8l&C
//}}AFX_MSG >DUE8hp;<
DECLARE_MESSAGE_MAP() Hq\E06S@
}; M|#5gKXd
#endif *-AAQ
~1r*/@M[V
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [F)/mN
#include "stdafx.h" 62l0
Z-
#include "Capture.h" ]|t.wr3AU
#include "CaptureDlg.h" -0o6*?[Z
#include <windowsx.h> 0 ;_wAk
#pragma comment(lib,"hook.lib") JX/4=..
#ifdef _DEBUG B H0#Q5
#define new DEBUG_NEW LL[#b2CKa
#undef THIS_FILE EY&C[=
static char THIS_FILE[] = __FILE__; tP
Efz+1N
#endif hJo^Wo
#define IDM_SHELL WM_USER+1 Y-3[KH D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L^Q+Q)zTh
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,Q=)$ `%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; BZ;}ROmqk
class CAboutDlg : public CDialog (d'j'U:C
{ ,J(5@8(>a
public: T$^>Fiz{Se
CAboutDlg(); wz*A<iU
// Dialog Data #}!>iFBcH
//{{AFX_DATA(CAboutDlg) r d6F"W
enum { IDD = IDD_ABOUTBOX }; Ls>u`hG
//}}AFX_DATA 8yWu{'G
// ClassWizard generated virtual function overrides 5\ w=(c9A
//{{AFX_VIRTUAL(CAboutDlg) 8f,'p}@!d
protected: mo#0q&ZQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HA9Nr.NqC@
//}}AFX_VIRTUAL =tc`:!$
// Implementation |aS~"lImh
protected: Cj !i)-
//{{AFX_MSG(CAboutDlg) <duBwkiG
//}}AFX_MSG /iTUex7T
DECLARE_MESSAGE_MAP() > 1r[]&8
}; YNg\"XjJM<
|)?aH2IL
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KZ!N{.Jk
{ g|._n
//{{AFX_DATA_INIT(CAboutDlg) -Y8ks7
//}}AFX_DATA_INIT rO(TG
} Z;fm;X%4
,%?; \?b%h
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c{,y{2c]LT
{ up&N CX
CDialog::DoDataExchange(pDX); d{2y/
//{{AFX_DATA_MAP(CAboutDlg) Im?= e
//}}AFX_DATA_MAP tt7PEEf
} !u53 3
{\svV
0)~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -7k|6"EwM
//{{AFX_MSG_MAP(CAboutDlg) K$<`4#i
// No message handlers 5%QC
][,
//}}AFX_MSG_MAP =XMD+
END_MESSAGE_MAP() [+%d3+27
{1Ju}=69
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1 ;\]D9i
: CDialog(CCaptureDlg::IDD, pParent) ']ITuP8
{ KUp
//{{AFX_DATA_INIT(CCaptureDlg) T/GgF&i3
m_bControl = FALSE; U0h)pdo
m_bAlt = FALSE; T2:oWjC3$
m_bShift = FALSE; 8tLT'2+H#
m_Path = _T("c:\\"); {=bg5I0|a
m_Number = _T("0 picture captured."); ]&C:>
nCount=0; FDF3zzP0
bRegistered=FALSE; Ha)3i{OM
bTray=FALSE; 3?.1~ "-J
//}}AFX_DATA_INIT I&pr_~.
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .DDg%z
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
)IFl
0<d
} ;|>q zx
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !,Xyl}
#
{ 5)d,G9
CDialog::DoDataExchange(pDX); sf |oNOz
//{{AFX_DATA_MAP(CCaptureDlg) YN,y0t/cQ
DDX_Control(pDX, IDC_KEY, m_Key); vzY'+9q1.
DDX_Check(pDX, IDC_CONTROL, m_bControl); }BI~am_
DDX_Check(pDX, IDC_ALT, m_bAlt); ,DQGv_
DDX_Check(pDX, IDC_SHIFT, m_bShift); L$Hx?^3
DDX_Text(pDX, IDC_PATH, m_Path); z(g%ue\
DDX_Text(pDX, IDC_NUMBER, m_Number); ?G$Om
//}}AFX_DATA_MAP iK5]y+@8
} +{,N X
a>o"^%x
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r6d0x
//{{AFX_MSG_MAP(CCaptureDlg) k4qLB1&,
ON_WM_SYSCOMMAND() z5XYpi_;[
ON_WM_PAINT() _M8G3QOx
ON_WM_QUERYDRAGICON() :3KO6/+
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3]O`[P,*%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) IL~]m?'V(
ON_BN_CLICKED(ID_CHANGE, OnChange) P0%N
Q1bn
//}}AFX_MSG_MAP n-b>m7O(
END_MESSAGE_MAP() k{gl^
7?6xPKQ)H
BOOL CCaptureDlg::OnInitDialog() e[x?6He,$
{ A Gv!c($
CDialog::OnInitDialog(); 0+T*$=?
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ZYE' C
ASSERT(IDM_ABOUTBOX < 0xF000); J+ Jt4
CMenu* pSysMenu = GetSystemMenu(FALSE); j 0g5<M
if (pSysMenu != NULL) F&=I7i
{ T ;i?w
CString strAboutMenu; |-~b$nUe
strAboutMenu.LoadString(IDS_ABOUTBOX); 0LetsDN7I
if (!strAboutMenu.IsEmpty()) y;Qy"-)qb
{ D:=t*2-Iv
pSysMenu->AppendMenu(MF_SEPARATOR); @%6)^]m}r
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cC^W2\
} 9@:BK;Fi
} QCeMKjCmY
SetIcon(m_hIcon, TRUE); // Set big icon H@K#|A=a
SetIcon(m_hIcon, FALSE); // Set small icon 'e}uvbK
m_Key.SetCurSel(0); jCU=+b=
RegisterHotkey(); \Dn&"YG7
CMenu* pMenu=GetSystemMenu(FALSE); z%OuI 8"'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R=!kbBK>\
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q;4}gUmI$
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FoE|Js
return TRUE; // return TRUE unless you set the focus to a control ;tJWOm
} :]vA2
iV5}U2Vh
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) sW
}<zGYd
{ 5\okU"{d7
if ((nID & 0xFFF0) == IDM_ABOUTBOX) V?OuIg%=:
{ :1:3Svb<Y
CAboutDlg dlgAbout; 8]S,u:E:N
dlgAbout.DoModal(); 3^{8_^I
} }1 $h xfb
else 0CT}DQ._^N
{ AT"!{Y "H
CDialog::OnSysCommand(nID, lParam); Vwjk[ DOL
} ov8
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} {}V$`L8
7; p4Wg7k}
void CCaptureDlg::OnPaint() `YPe^!`$
{ ]JH64~a
if (IsIconic()) 9/#0?(K8
{ ?N:B
CPaintDC dc(this); // device context for painting rvW!7-R
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2;8Xz6T
// Center icon in client rectangle $30oc
Tt{
int cxIcon = GetSystemMetrics(SM_CXICON); W7t
>&3l
int cyIcon = GetSystemMetrics(SM_CYICON); |~z3U>
CRect rect; *P`v^&
GetClientRect(&rect); xdPcsox~
int x = (rect.Width() - cxIcon + 1) / 2; YQ;
cJ$
int y = (rect.Height() - cyIcon + 1) / 2; N1%p"(
// Draw the icon f0vJm
dc.DrawIcon(x, y, m_hIcon); WP}ixcq#
} 1@xP(XS
else Q8p=!K
{ m#JI!_~!
CDialog::OnPaint(); g6WPPpqus
} X2qv^G,
} HN{z T&
QIQfI05
HCURSOR CCaptureDlg::OnQueryDragIcon() 2Zy_5>~
{ R~)ybf{
return (HCURSOR) m_hIcon; nP<S6:s:
} S.{fDcM
q(78fZ *X
void CCaptureDlg::OnCancel() 3QW_k5o
{ ]fZ<`w8u}
if(bTray) /#f^n]v
DeleteIcon(); {3LA%xO
CDialog::OnCancel(); _pW_G1U
} Av o|v>
Mi]I:ka
void CCaptureDlg::OnAbout() (?vK_{
{ 8!&nKy<Y
CAboutDlg dlg; r4u z} jl{
dlg.DoModal(); )>\4ULR83
} !DPF7x(-{
61} i5o
void CCaptureDlg::OnBrowse() /t*YDWLg
{ WfZF~$li`
CString str; C ZJV_0
BROWSEINFO bi; .oEbEs
char name[MAX_PATH]; iRNLKi
ZeroMemory(&bi,sizeof(BROWSEINFO)); `?"6l5d.]
bi.hwndOwner=GetSafeHwnd(); fxd0e;NAAh
bi.pszDisplayName=name; B8 H75sz
bi.lpszTitle="Select folder";
dy<27 =
bi.ulFlags=BIF_RETURNONLYFSDIRS; >.e+S?o
LPITEMIDLIST idl=SHBrowseForFolder(&bi); \7Qb229?
if(idl==NULL) 'f+NW&
return; pLnB)z?
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !;v.>.lw
str.ReleaseBuffer(); v`x|]-/M&
m_Path=str; :'}@Al9=>
if(str.GetAt(str.GetLength()-1)!='\\') 'Dath>Y=
m_Path+="\\"; 9cG<hX9`F
UpdateData(FALSE); yzR=A%V8A
} %D`o
yS!(Ap
void CCaptureDlg::SaveBmp() 8O7Yv<
{ =xL )$DTg)
CDC dc; _7"5wB?|+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); /aY pIMi9}
CBitmap bm; 8.QSqW7t
int Width=GetSystemMetrics(SM_CXSCREEN); bAEg$A
int Height=GetSystemMetrics(SM_CYSCREEN); CE ~@}`
bm.CreateCompatibleBitmap(&dc,Width,Height); _okWQvdH
CDC tdc; 4r&f%caU
tdc.CreateCompatibleDC(&dc); oh~:,
CBitmap*pOld=tdc.SelectObject(&bm); M&KyA
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +Rwx%=
tdc.SelectObject(pOld); sZg6@s=
BITMAP btm; ;JT(3yK4>p
bm.GetBitmap(&btm); &w85[zs
DWORD size=btm.bmWidthBytes*btm.bmHeight; D//=m=
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !:3.D,
BITMAPINFOHEADER bih; +&5'uAe
bih.biBitCount=btm.bmBitsPixel; }Cj8
bih.biClrImportant=0; d(;4`kd*N
bih.biClrUsed=0; D."=k{r.
bih.biCompression=0; %d2!\x%bG
bih.biHeight=btm.bmHeight; BI/&dKM
bih.biPlanes=1; I4=Xb^Ux
bih.biSize=sizeof(BITMAPINFOHEADER); =rFN1M/n{E
bih.biSizeImage=size; =lp1Z>
bih.biWidth=btm.bmWidth; &;c>O
bih.biXPelsPerMeter=0;
)h_8vO2
bih.biYPelsPerMeter=0; (dqCa[
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =-#G8L%Q
static int filecount=0; MsOs{2
)2
CString name; h/)_)
r.x
name.Format("pict%04d.bmp",filecount++); asVX82<
name=m_Path+name; hH>``gK
BITMAPFILEHEADER bfh; G$bJ+
bfh.bfReserved1=bfh.bfReserved2=0; !yJICjXj
bfh.bfType=((WORD)('M'<< 8)|'B'); wRvb8F0
bfh.bfSize=54+size; )d`mvZBn1
bfh.bfOffBits=54; Da.G4,vLh
CFile bf; Ak@Dyi?p
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 86
.`T l;
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); r.yK,
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mJ5H=&Z
bf.WriteHuge(lpData,size); *if`/N-q(m
bf.Close(); CvDxq:x
nCount++; 6RoAl$}'
} =qu(~]2(
GlobalFreePtr(lpData); w7TJv4_
if(nCount==1) vScjq5"p
m_Number.Format("%d picture captured.",nCount); r!GW=u'
else 8b(!k FxD
m_Number.Format("%d pictures captured.",nCount); 7DD&~ZcD
UpdateData(FALSE); #7G*GbKY
} J G$Z.s
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WsGths+[
{ l\OLyQ
if(pMsg -> message == WM_KEYDOWN) Dw6 fmyJ:
{ F3Maqr y
if(pMsg -> wParam == VK_ESCAPE) "i^
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return TRUE; ravyiOL
if(pMsg -> wParam == VK_RETURN) aZS7sV28
return TRUE; A8r^)QJP{
} /F)H\*
return CDialog::PreTranslateMessage(pMsg); :-T*gqj|
} -NJ!g/ >mM
L2UsqVU
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1q7tiMvV-
{ ino:N5&;;
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ xc@Ss[
SaveBmp(); =qy@Wvj$
return FALSE; `G9 l
} 5GzFoy)j>
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3FE( }G
CMenu pop; soRv1) el
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yx38g
ca
CMenu*pMenu=pop.GetSubMenu(0); zeb=8Dg
:
pMenu->SetDefaultItem(ID_EXITICON);
\M<3}t
CPoint pt; 4T6 {Y
GetCursorPos(&pt); IxZb$h[
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o 5U(i
if(id==ID_EXITICON) *ISZlR\#
DeleteIcon(); W~1~k{A
else if(id==ID_EXIT) avQJPB)}Sb
OnCancel(); "R>FqX6FB
return FALSE; CusF/>
} :aCrX
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o\b- _E5"?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2_^aw[-
AddIcon(); w
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return res; :rMM4
} MRNNG6TUs
ED>prE0
void CCaptureDlg::AddIcon() kR CQv-*
{ uo%P+om_}
NOTIFYICONDATA data; l7H
qo)
data.cbSize=sizeof(NOTIFYICONDATA); YyAJ m^o
CString tip; "TyJP[/
tip.LoadString(IDS_ICONTIP); bNs4 5hDP
data.hIcon=GetIcon(0); }@ Z56
data.hWnd=GetSafeHwnd(); V"\0Y0
strcpy(data.szTip,tip); *iBTI+"]
data.uCallbackMessage=IDM_SHELL; a8k; (/
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~}EMk 3
data.uID=98; :}8Z@H!KkY
Shell_NotifyIcon(NIM_ADD,&data); .IBp\7W!?E
ShowWindow(SW_HIDE); 'rp }G&m
bTray=TRUE; bV+(b9
} >@xrs
&Mq~T_S
void CCaptureDlg::DeleteIcon() 4fk8*{Y
{ eV:9y
NOTIFYICONDATA data; V&8VwF^-
data.cbSize=sizeof(NOTIFYICONDATA); jp8@vdRg
data.hWnd=GetSafeHwnd(); NX`*%K
data.uID=98; v\16RD
Shell_NotifyIcon(NIM_DELETE,&data); @AHm!9?o
ShowWindow(SW_SHOW); c0B|F
SetForegroundWindow(); 9{k97D/
ShowWindow(SW_SHOWNORMAL); ^k5ll=}
bTray=FALSE; )'17r82a
} 0sN.H=
N{
Z
H
void CCaptureDlg::OnChange() 3.22"U\1:
{ 5pr"d@.
RegisterHotkey(); +/,icA}PI
} @SZM82qU2z
{^(ACS9mL
BOOL CCaptureDlg::RegisterHotkey() :I -V_4b
{ .+7;)K
UpdateData(); 7S/G
B
UCHAR mask=0; HEA#bd\
UCHAR key=0; ,@1p$n
if(m_bControl) Dd;Nz
mask|=4; (?_S6HE
if(m_bAlt) qmO6,T-|
mask|=2; -F'b8:m
if(m_bShift) 8Ac)'2t;U
mask|=1; Bm&kkx.9P
key=Key_Table[m_Key.GetCurSel()]; ~|<WHHN(
if(bRegistered){ \fA{1
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Eskb9^A
bRegistered=FALSE; 7VcmVq}X
} =mA: ctu~v
cMask=mask; }ci#>
cKey=key; 3 "o"fl
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U2uF&6v
return bRegistered; 9Gv[8'I
} 'YNT8w/3
^Wxad?@
四、小结 >:D
j\"o
GpZc5c
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。