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:
u^{Q|o:=x
\O^=
Z{3y 一、实现方法
bT8BJY%+ t rHj7Nw 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:
i1/FNem K46mE #pragma data_seg("shareddata")
QJv,@@mu HHOOK hHook =NULL; //钩子句柄
B a Xzz UINT nHookCount =0; //挂接的程序数目
HVC\(h,)i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
7$^V_{ej static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
M]6=Rxq1:E static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
$H_4Y-xOi static int KeyCount =0;
>s1HQSe66 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
h<6r+*T' p #pragma data_seg()
E[$['0 D$j`+` 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。
-8EdTc@ 4 ba1c 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:
#Uudx~b l]%|w]i\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
//WgK{Mt cKey,UCHAR cMask)
| o+vpy {
B$7lL BOOL bAdded=FALSE;
<1hwXo for(int index=0;index<MAX_KEY;index++){
KKOu":b
if(hCallWnd[index]==0){
GM@TWwG-B hCallWnd[index]=hWnd;
R,y8~D HotKey[index]=cKey;
SBYRN##n_ HotKeyMask[index]=cMask;
/R^!~J50 bAdded=TRUE;
bi,%QZZ KeyCount++;
uH]^/'8vBd break;
z`TI<B }
1pcSfN :"1 }
%.Mtn%:I* return bAdded;
A^g81s.5 }
i~\gEMaO //删除热键
M>0~Ek%3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
xE + Go {
zmuq4-. BOOL bRemoved=FALSE;
U;;Har for(int index=0;index<MAX_KEY;index++){
Qi[T!1 if(hCallWnd[index]==hWnd){
'dBzv>ngD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Ad]r )d{ hCallWnd[index]=NULL;
( /uL6W d0 HotKey[index]=0;
.}Xkr+
+] HotKeyMask[index]=0;
8y+Gvk: bRemoved=TRUE;
*gBaF/C KeyCount--;
u_mm*o~)g break;
#?aR,@n }
}p
"HD R> }
h; {?z }
R/ P.m~? return bRemoved;
Va9vDb6 }
tl#hCy |>[w$ Wqy8ZgSC DLL中的钩子函数如下:
bG\1<:6B {0e5<"i LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!vG._7lPp {
>.B+xn= BOOL bProcessed=FALSE;
6.ap^9AD if(HC_ACTION==nCode)
n+xM)) {
mv+.5X if((lParam&0xc0000000)==0xc0000000){// 有键松开
SLBKXj| switch(wParam)
71wyZJ {
o2%"Luf< case VK_MENU:
uV;Z MaskBits&=~ALTBIT;
`UeF3~)>E break;
dLjT^ 9 case VK_CONTROL:
_I@dt6oF MaskBits&=~CTRLBIT;
+LrW#K; break;
h#;yA"j1& case VK_SHIFT:
}P^n / MaskBits&=~SHIFTBIT;
ukri7 n* break;
@89mj{ default: //judge the key and send message
&\1Dy}: break;
M?]ObIM:5 }
f0:) for(int index=0;index<MAX_KEY;index++){
ZtIK"o-|! if(hCallWnd[index]==NULL)
L@v0C) continue;
{x-g?HB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
k
9s3@S {
Xst&QKU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4CNK ]2 bProcessed=TRUE;
.p0;y3so4 }
Ws(BouJ }
iPE-j#| }
{!x-kF_ else if((lParam&0xc000ffff)==1){ //有键按下
v^KJU
+ switch(wParam)
kV-a'"W5 {
<Qwi 0$ case VK_MENU:
bv|v9_i MaskBits|=ALTBIT;
_gU[FUBtJ break;
Ih"f98lV case VK_CONTROL:
^gv)[ MaskBits|=CTRLBIT;
c L84}1QD break;
]Y,
7 X case VK_SHIFT:
M"~B_t,Nw MaskBits|=SHIFTBIT;
&0Nd9%> break;
/@on=~ default: //judge the key and send message
>R.~'A/$F break;
;/ p)vR }
}<S|_F for(int index=0;index<MAX_KEY;index++){
&4DvZq= if(hCallWnd[index]==NULL)
Hjlx,:'M continue;
na%9E8;:&v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pW!] {
x37r{$2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
zYH6+!VBH# bProcessed=TRUE;
UIzk-.< }
_{T`ka }
$k}+,tHtJO }
YMz[je if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
_"z#I
CT( for(int index=0;index<MAX_KEY;index++){
:Rq@ %rL if(hCallWnd[index]==NULL)
f61~%@fE continue;
b/E1v,/< if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
nEs l SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Vd|/]Zj //lParam的意义可看MSDN中WM_KEYDOWN部分
SkN^ytKE }
E6BW&Xp }
vUj7rDT| }
!$Mv)c/_u return CallNextHookEx( hHook, nCode, wParam, lParam );
R'&^)_ }
?ILNp`k a'Aru^el 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:
~>)cY{wE_ '0?5K0
2( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
g"<kj" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\#~~,k
6f gNe{P~ $= 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
!L> 'g v82@']IN LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
|n Mbf {
b/WVWDyob/ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
.bew,92 {
&XN*T.Y` //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
[NC^v.[1[ SaveBmp();
\5X34'7 return FALSE;
{9Y@? }
]+,Z() …… //其它处理及默认处理
5tQffo8t }
>e8t @bS>XWI> ~H?RHYP~ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
IzkZ^;(N awMm&8cIM 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
LvE|K&R| )]rGGNF* 二、编程步骤
R%}OZJ_ Jd/5Kx 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
MI<hShc\ {hVSVx8ZL 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
<9B43 *}3~8fu{
3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
us$~6 )FE'#\ 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;
&\K,kS [.r ]+ug:E{7 5、 添加代码,编译运行程序。
%p^C,B{7w trM8p 三、程序代码
3{~hRd nL@P{,J ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
hg=\L5R #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
; N!K/[p= #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
x4Eq5"F7} #if _MSC_VER > 1000
l&5| =
#pragma once
q0SvZw]f1 #endif // _MSC_VER > 1000
# P18vK5 #ifndef __AFXWIN_H__
=yfr{5}R #error include 'stdafx.h' before including this file for PCH
>0B[ #endif
5v!Uec'+ #include "resource.h" // main symbols
KmpX^Se[ class CHookApp : public CWinApp
R3%T}^;f {
,O $F`0>9A public:
{h|3P/?7 CHookApp();
5+giT5K*h // Overrides
A#LK2II^ // ClassWizard generated virtual function overrides
m,qU}) //{{AFX_VIRTUAL(CHookApp)
C6Dq7~{B public:
! =I:Uc-Y virtual BOOL InitInstance();
pO=bcs8Z virtual int ExitInstance();
0nG&
LL5 //}}AFX_VIRTUAL
I0GL/a4s //{{AFX_MSG(CHookApp)
Eq'YtqU // NOTE - the ClassWizard will add and remove member functions here.
Y"G$^3% (] // DO NOT EDIT what you see in these blocks of generated code !
! X*L<)=nh //}}AFX_MSG
rDm>Rm= DECLARE_MESSAGE_MAP()
Ab8~'<F$B };
G
}TT- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
.r[J} O" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
w{#%&e(q" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
6R dfF$f BOOL InitHotkey();
X[grVe BOOL UnInit();
T\. 8og #endif
gO_^{>2 R0-ARq#0< //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
fJC)>doM #include "stdafx.h"
*s;$`8fM< #include "hook.h"
024*IoVZ #include <windowsx.h>
jAN(r>zVL #ifdef _DEBUG
80l(,0`, #define new DEBUG_NEW
l.fNkLC# #undef THIS_FILE
l<GRM1^kU static char THIS_FILE[] = __FILE__;
I\`:(V #endif
)Q~Q. #define MAX_KEY 100
5N`g #define CTRLBIT 0x04
Br1JZHgA #define ALTBIT 0x02
F_\\n#bv #define SHIFTBIT 0x01
m <aMb #pragma data_seg("shareddata")
&A=d7ASN= HHOOK hHook =NULL;
uqX"^dn4u UINT nHookCount =0;
<f8@Qij static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Z37Z static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
]N2'L!4|; static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`[57U,v static int KeyCount =0;
TJLz^%t static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]-L/Of6F)| #pragma data_seg()
V>4 !fD= HINSTANCE hins;
]wdudvS@6r void VerifyWindow();
H*; J9{ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
*!'00fv //{{AFX_MSG_MAP(CHookApp)
>Py; 6K // NOTE - the ClassWizard will add and remove mapping macros here.
ra$_#HY // DO NOT EDIT what you see in these blocks of generated code!
u\smQhQGE //}}AFX_MSG_MAP
[sACPn$f END_MESSAGE_MAP()
{l\v J#r: kd!f/'E! CHookApp::CHookApp()
i|.!*/qF {
I{B8'n{cN // TODO: add construction code here,
klv^310 // Place all significant initialization in InitInstance
Scxf5x- }
Y2<Z"D` LEHlfB#z`@ CHookApp theApp;
|I85]'K9a LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
q35%t61Lc {
rbQA6_U 5A BOOL bProcessed=FALSE;
5wP(/?sRy if(HC_ACTION==nCode)
kX5v!pm[ {
wz>j>e6k` if((lParam&0xc0000000)==0xc0000000){// Key up
Kze\|yJ switch(wParam)
z4H!b+ {
D-~HJ case VK_MENU:
TS-m^Y'R MaskBits&=~ALTBIT;
|~#!e}L( break;
}5zH3MPQH case VK_CONTROL:
cf@:rHB} MaskBits&=~CTRLBIT;
h#;fBQ]
break;
\A keC 6[D case VK_SHIFT:
E2!;W8M MaskBits&=~SHIFTBIT;
}^)M)8zS break;
!\+SE"ml default: //judge the key and send message
gHYYxhW$ break;
W53i5u( }
0y2iS't
for(int index=0;index<MAX_KEY;index++){
ikyvst>O if(hCallWnd[index]==NULL)
*RN*Bh|$ continue;
m'z <d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+% '0; {
g&riio7lx SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
RrKs!2sCT bProcessed=TRUE;
u+XZdV }
-%%2Pz0I }
JcvK]x }
gLd3,$Ei else if((lParam&0xc000ffff)==1){ //Key down
;t[<! switch(wParam)
+#'exgGU^[ {
a+r0@eFLc case VK_MENU:
v<3i ~a MaskBits|=ALTBIT;
&[23DrI8 break;
GMB%A case VK_CONTROL:
CQ#p2 MaskBits|=CTRLBIT;
Il*wVNrZI break;
VGq2ITg9eE case VK_SHIFT:
{Qlvj.Xw MaskBits|=SHIFTBIT;
\>:(++g break;
k@KX=mG< default: //judge the key and send message
rs 7R5 F break;
[$-y8`~( }
rw8db' for(int index=0;index<MAX_KEY;index++)
oNl_r: G {
$;$_N43 if(hCallWnd[index]==NULL)
SijCE~P continue;
:mY(d6#A> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&d9";V"E {
F0Rk[GM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
vF1]L]z:? bProcessed=TRUE;
!mq+Oz~ }
7tit>dJ }
l,,5OZw }
eX;"kO if(!bProcessed){
L!-T`R8'c for(int index=0;index<MAX_KEY;index++){
\CU.'|X if(hCallWnd[index]==NULL)
>E[cl\5$E continue;
6M259*ME if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
%hcY
[F< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
v3.JG]zLpP }
OC"W=[Myl }
J"I{0>@ }
#LBZ%%v return CallNextHookEx( hHook, nCode, wParam, lParam );
!63x^# kg }
#}e)*( ;Fp"]z!Qh+ BOOL InitHotkey()
C!~&c7 {
/d8PDc " if(hHook!=NULL){
MP0gLi nHookCount++;
)P\ec return TRUE;
GP`_R }
0u-'{6 else
Jr
9\j3J{ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
6S<J'9sE if(hHook!=NULL)
+<8r?d2 nHookCount++;
7lf*
v qG return (hHook!=NULL);
gnx!_H\h< }
vY}/CBmg BOOL UnInit()
uK3,V0 yz {
=#n|t[h- if(nHookCount>1){
A2*z nHookCount--;
G#3 O^,m return TRUE;
om;jXf}A }
dJ:EXVU BOOL unhooked = UnhookWindowsHookEx(hHook);
9M<qk si if(unhooked==TRUE){
]NG`MZ
nHookCount=0;
<E!M<!h hHook=NULL;
?
vk;b! }
3QU<vdtr return unhooked;
O62H4oT }
V.\do"m iHWl%]7sN BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
OpUC98p?@ {
trtI^^/% BOOL bAdded=FALSE;
Z5_U D for(int index=0;index<MAX_KEY;index++){
DHgEhf] if(hCallWnd[index]==0){
qZCA16 hCallWnd[index]=hWnd;
ZIkXy*<( HotKey[index]=cKey;
|V%Qp5 XJ HotKeyMask[index]=cMask;
$(.[b][S bAdded=TRUE;
ZU7,=B= KeyCount++;
/&cb`^"U^ break;
rFdq \BSi }
wUW+S5"K }
\ec,=7S<Zf return bAdded;
7L? ~;;L$ }
{b=]JPE 2c_#q1/Z/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vX/~34o]\ {
:a[L-lr`e BOOL bRemoved=FALSE;
:W-"UW, for(int index=0;index<MAX_KEY;index++){
g}P.ksM if(hCallWnd[index]==hWnd){
;r"YZs&Xd if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
^szCf|SM hCallWnd[index]=NULL;
:TX!lbCq HotKey[index]=0;
V!a\:%#^Y HotKeyMask[index]=0;
@/E5$mX` bRemoved=TRUE;
YRAWylm KeyCount--;
8b[^6]rM break;
pDr M8)r }
ORyFE:p$ }
H'&x4[J: }
>N{K)a return bRemoved;
j#Bea , }
+8v^J8q0 4}gqtw: void VerifyWindow()
q.g<g u] {
o!gl
:izb for(int i=0;i<MAX_KEY;i++){
=K-B
I if(hCallWnd
!=NULL){ XGbtmmQG
if(!IsWindow(hCallWnd)){ _U|s!60'
hCallWnd=NULL; |Q?IV5%$
HotKey=0; w8%<O^wN,
HotKeyMask=0; 1|q$Wn:*
KeyCount--; )$]_;JFr
} uIiE,.Uu}
} gH(,>}{^K
} K8ecSs}}J
} b'3w.%^
'Oyz/P(p
BOOL CHookApp::InitInstance() E#Smi507p
{ <A; R%\V
AFX_MANAGE_STATE(AfxGetStaticModuleState()); =*~]lz__M
hins=AfxGetInstanceHandle(); ?m}vDd
InitHotkey(); Q]uxZ;}aF
return CWinApp::InitInstance(); \|L ~#{a
} vxzh|uF
[x
kbzJ
int CHookApp::ExitInstance() F)z]QJOw
{ ?MHVkGD
VerifyWindow(); `p|{(g'
UnInit(); -WWa`,:
return CWinApp::ExitInstance(); 2bPrND\P=
} Ugp[Ugr
Pe6MDWR
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file v2 T+I]I
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q"h/o"-h
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2,{m>fF
#if _MSC_VER > 1000 ypSW 9n
#pragma once 1(CpTaa
#endif // _MSC_VER > 1000 WV]Si2pOZ
:,h47'0A
class CCaptureDlg : public CDialog F3HpDfy
{ /59jkcA+
// Construction n{s
`XyH
public: .J6Oiv.E
BOOL bTray; !_3Rd S
BOOL bRegistered; dq+VW}[EO
BOOL RegisterHotkey(); Z@nWx]iz
UCHAR cKey; ODyK/Q3
UCHAR cMask; Y;O\ >o[
void DeleteIcon(); N,0l5fD~T
void AddIcon(); kAsYh4[
UINT nCount; f"\G"2C
void SaveBmp(); (j@3=-%6 G
CCaptureDlg(CWnd* pParent = NULL); // standard constructor D(yU:^L
// Dialog Data PHU#$LG
//{{AFX_DATA(CCaptureDlg) bS=aFl#
enum { IDD = IDD_CAPTURE_DIALOG }; =;#+8w=^
CComboBox m_Key; 3xj
?}o
BOOL m_bControl; JL5
)
BOOL m_bAlt; C_mPw
BOOL m_bShift; 80TSE*
CString m_Path; v9QR,b`n
CString m_Number; pTT7#b(t
//}}AFX_DATA /GCI`hx>"
// ClassWizard generated virtual function overrides %JF.m$-
//{{AFX_VIRTUAL(CCaptureDlg) !B5 }`*1D
public: kTZ`RW&0
virtual BOOL PreTranslateMessage(MSG* pMsg); ]a F,r"
protected: !C]0l
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,_
}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =~}\g;K1Q
//}}AFX_VIRTUAL Z7a~M3VnZ
// Implementation KAVe~j"
protected: `irz'/"p
HICON m_hIcon; q,w8ca4~y
// Generated message map functions r`Y[XzT9
//{{AFX_MSG(CCaptureDlg) M S$^m2
virtual BOOL OnInitDialog(); FW~%xUSE5
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $9k7A 8K
afx_msg void OnPaint(); 1Tz5tU9kR
afx_msg HCURSOR OnQueryDragIcon(); P(D0ru
virtual void OnCancel(); IhoV80b
afx_msg void OnAbout(); s
tvI
afx_msg void OnBrowse(); \X1?,gV_
afx_msg void OnChange(); Q}zAC2@L
//}}AFX_MSG /UtCJMQ
DECLARE_MESSAGE_MAP() Gw%P5 r}Y
}; !A!}j.s
#endif f"My;K $l;
I<yd=#:n
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `p0+j
#include "stdafx.h" M*li;
#include "Capture.h" /D2
cY>
#include "CaptureDlg.h" *M6'
GT1%c
#include <windowsx.h> EX zA(igS
#pragma comment(lib,"hook.lib") L@xag-b
i
#ifdef _DEBUG ^oaFnzJdf
#define new DEBUG_NEW B7HNNX
#undef THIS_FILE W?is8r:
static char THIS_FILE[] = __FILE__; Hs,pY(l^
#endif 6%?bl{pNn
#define IDM_SHELL WM_USER+1 Z&BJ/qk
\-
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]U?)_P@}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /<ODP6Yy;
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; GxjmHo
class CAboutDlg : public CDialog 2IDN?Mw
{ 3<">1] /,
public: @)n xX))a
CAboutDlg(); [HNWM/ff7+
// Dialog Data =qG%h5]n
//{{AFX_DATA(CAboutDlg) cXP*?N4Cf
enum { IDD = IDD_ABOUTBOX }; t6m&+N
//}}AFX_DATA 2|]pD
// ClassWizard generated virtual function overrides P|c[EUT
//{{AFX_VIRTUAL(CAboutDlg) $d\]s]}`
protected: ^I2+$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mY!os91KoO
//}}AFX_VIRTUAL =SMI,p&
// Implementation -CePtq`
protected: .&Tcds
//{{AFX_MSG(CAboutDlg) N<XS-XB,
//}}AFX_MSG ;;|S
QX
DECLARE_MESSAGE_MAP() =@BVO@z@
}; BCUn[4Gp
;J<K/YdI
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4I&e_b< 30
{ bp"@vlv
//{{AFX_DATA_INIT(CAboutDlg) l}\q }7\)
//}}AFX_DATA_INIT cPu<:<F[
} 0i%r+_E_
SbrKNADH%
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vq(ElXTO
{ 9&]g2iT P
CDialog::DoDataExchange(pDX); %<[?;
//{{AFX_DATA_MAP(CAboutDlg) /4K ^-
//}}AFX_DATA_MAP BF >678h
} D=ZH? d
"}/$xOl"
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :<Z>?x
//{{AFX_MSG_MAP(CAboutDlg) :`U@b
6
// No message handlers {|:ro!&
//}}AFX_MSG_MAP @ ={Hx$zL
END_MESSAGE_MAP() j_w"HiNBA
f&5'1tG
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) cviPCjM
: CDialog(CCaptureDlg::IDD, pParent) kF,_o/Jc
{ Cf&.hod
//{{AFX_DATA_INIT(CCaptureDlg) qGezmkNFm
m_bControl = FALSE; J*I G]2'H
m_bAlt = FALSE; O:G5n 5J
m_bShift = FALSE; `?M?WaP
m_Path = _T("c:\\"); p1}m_
m_Number = _T("0 picture captured."); ]|6)'L&]*s
nCount=0; yv),>4_6
bRegistered=FALSE; <d`ksZ+
bTray=FALSE; Jw-?7O
//}}AFX_DATA_INIT MTyBGrs(
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :_,oD
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); TAd~#jB9
} <4{Jm8zJ
uC2-T5n'
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 108cf~2&
{ Ej;BI#gx=
CDialog::DoDataExchange(pDX); {`KRr:w
//{{AFX_DATA_MAP(CCaptureDlg) 0<^!<i(%
DDX_Control(pDX, IDC_KEY, m_Key); Ad%3 fvn
DDX_Check(pDX, IDC_CONTROL, m_bControl); V1h&{D\"
DDX_Check(pDX, IDC_ALT, m_bAlt); o$4xinK
DDX_Check(pDX, IDC_SHIFT, m_bShift); )P|&o%E
DDX_Text(pDX, IDC_PATH, m_Path); tV'>9YVdG
DDX_Text(pDX, IDC_NUMBER, m_Number); F0i`HO{
//}}AFX_DATA_MAP 1ha
8)L
} +Y|1 7n
KO!.VxG]_
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R}T8cVxc
//{{AFX_MSG_MAP(CCaptureDlg) y'{*B(
ON_WM_SYSCOMMAND() 8x,{rSqq
ON_WM_PAINT() _/\U
ON_WM_QUERYDRAGICON() cT&!_g#g
ON_BN_CLICKED(ID_ABOUT, OnAbout) :_0"t-
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'c6t,%
ON_BN_CLICKED(ID_CHANGE, OnChange) f$2DV:wuC
//}}AFX_MSG_MAP r9\7I7z
END_MESSAGE_MAP() _`Lv@T.
'Edm /+
BOOL CCaptureDlg::OnInitDialog() :b~5nftr
{ wR(>'?
CDialog::OnInitDialog(); z\F#td{ r
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $F#eD0|
ASSERT(IDM_ABOUTBOX < 0xF000); #uc9eh}CWO
CMenu* pSysMenu = GetSystemMenu(FALSE); j92X"yB
if (pSysMenu != NULL) d~hN`ff
{ s%Y8;D,~+
CString strAboutMenu; \H&8.<HJ
strAboutMenu.LoadString(IDS_ABOUTBOX); l(~i>iQ
4
if (!strAboutMenu.IsEmpty()) ^J]_O_ee$
{ /%F}vW(!
pSysMenu->AppendMenu(MF_SEPARATOR); p)k5Uh"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v9_7OMl/x
} o1k
X` Eu
} #s}&
SetIcon(m_hIcon, TRUE); // Set big icon :svKE.7{
SetIcon(m_hIcon, FALSE); // Set small icon mD"[z}r)
m_Key.SetCurSel(0); jl)7Jd
RegisterHotkey(); =^5,ua6
CMenu* pMenu=GetSystemMenu(FALSE); {0Jpf[.f
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); J? 4E Hl
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^T< HD
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); UgP
return TRUE; // return TRUE unless you set the focus to a control P/ XO5`
} k
x?m "a%
fvNj5Vq:
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #`5>XfbmQ(
{ Z;"YUu[(
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ZR[6-
{ )?$zY5
CAboutDlg dlgAbout; 7.W$6U5
dlgAbout.DoModal(); ahmxbv3f=5
} t`!@E#VK
else oQ{
X2\
{ &e%eIz
CDialog::OnSysCommand(nID, lParam); a<W.}0ZY
} #*~3gMI{=
} =3H*%
$p)e.ZMgE
void CCaptureDlg::OnPaint() \;FE@
{ hf1h*x^J
if (IsIconic()) esk~\!d
{ yBYZ? gc
CPaintDC dc(this); // device context for painting _7bQR7s
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); GpC*w
~
// Center icon in client rectangle h2_A'
int cxIcon = GetSystemMetrics(SM_CXICON); jiGXFM2
int cyIcon = GetSystemMetrics(SM_CYICON); gK_#R]
CRect rect; Ja[7/
GetClientRect(&rect); =c34MY(#X
int x = (rect.Width() - cxIcon + 1) / 2; >V$
S\"
int y = (rect.Height() - cyIcon + 1) / 2; o ?`LZd:{
// Draw the icon jFH wu*
dc.DrawIcon(x, y, m_hIcon); %s),4
} Id<O/C
else k"pN
{ *a2-Vte
CDialog::OnPaint(); k+%c8w 9
}
B'QcD
} g}gOAN3.
? \p,s-CR:
HCURSOR CCaptureDlg::OnQueryDragIcon() 6BY(Y(z
{ 9.^2CM6l
return (HCURSOR) m_hIcon; QTmMj@R&(
} /$=<RUE
A2p]BW&
void CCaptureDlg::OnCancel() ?C`&*+
{ E06)&tF
if(bTray) UPGS/Xs]1
DeleteIcon(); s)-O{5;U
CDialog::OnCancel(); pkEx.R)
} Y$<p_X,
QnH;+k
ln
void CCaptureDlg::OnAbout() 0wpGIT!2
{ mXK7y.9\
CAboutDlg dlg; |FP@NUX\
dlg.DoModal(); Cb
i;CF\{
} k*e$_
]uZaj?%J<
void CCaptureDlg::OnBrowse() 4sM9~zC5
{ %uQOAe55
CString str; (4Ha'uqz
BROWSEINFO bi; fI"OzIJV
char name[MAX_PATH]; xO
6$:o-
ZeroMemory(&bi,sizeof(BROWSEINFO)); i@o'Fc
bi.hwndOwner=GetSafeHwnd(); <o"2z~gv
bi.pszDisplayName=name; T;1aL4w"
bi.lpszTitle="Select folder"; f|NWn`#bY
bi.ulFlags=BIF_RETURNONLYFSDIRS; tBtmqxx
LPITEMIDLIST idl=SHBrowseForFolder(&bi); #V U>Z|$@N
if(idl==NULL) 3,dIW*<**
return; Rxl/)H[Lc"
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6vr8rJ-
str.ReleaseBuffer(); nPg,(8Tt
m_Path=str; YtFH@M
if(str.GetAt(str.GetLength()-1)!='\\') ()ZP=\L
m_Path+="\\"; T_I ApC
UpdateData(FALSE); rvG0aqO`
} N+CcWs!E
z"$huE>P6
void CCaptureDlg::SaveBmp() [ n2)6B\/
{ "YoFUfaNg
CDC dc; Z11I1)%s
dc.CreateDC("DISPLAY",NULL,NULL,NULL); :)j& t>aP
CBitmap bm; +OeoA{-W
int Width=GetSystemMetrics(SM_CXSCREEN); ' )~G2Ys
int Height=GetSystemMetrics(SM_CYSCREEN); jm&PGZ#n=R
bm.CreateCompatibleBitmap(&dc,Width,Height); J5L[)Gd)D
CDC tdc; aBT8mK -.
tdc.CreateCompatibleDC(&dc); 0RGqpJxk
CBitmap*pOld=tdc.SelectObject(&bm); CQh6;[\:
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); UYkuz
tdc.SelectObject(pOld); U`kO<ztk
BITMAP btm; gI{56Z
bm.GetBitmap(&btm); Ur,{ZGm
DWORD size=btm.bmWidthBytes*btm.bmHeight; "VI2--%v3
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); r[4dGt
BITMAPINFOHEADER bih; JXqwy^f
bih.biBitCount=btm.bmBitsPixel;
XM<
bih.biClrImportant=0; 8ps1Q2|
bih.biClrUsed=0; >d<tcaB
bih.biCompression=0; <hB~|a<#
bih.biHeight=btm.bmHeight; G`R_kg9$
bih.biPlanes=1; nV>=n,+s"
bih.biSize=sizeof(BITMAPINFOHEADER); 0ra+MQBg
bih.biSizeImage=size; I7?s+vyds
bih.biWidth=btm.bmWidth; s&D>'J
bih.biXPelsPerMeter=0; |l673FcJ
bih.biYPelsPerMeter=0; JK^pb0ih
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); JTdcLmL
static int filecount=0; a8cX{6
CString name; C sx
EN4
name.Format("pict%04d.bmp",filecount++); Z/+H
name=m_Path+name; y2:Bv2}
BITMAPFILEHEADER bfh; Igb%bO_
bfh.bfReserved1=bfh.bfReserved2=0; ^^kL.C Ym
bfh.bfType=((WORD)('M'<< 8)|'B'); Dy^A??A[E}
bfh.bfSize=54+size; U{ZKxE
bfh.bfOffBits=54; }ZkGH}K_}
CFile bf; 7f\/cS^
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o>MB8[r
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m?]=
=9
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '=1@,Skj-
bf.WriteHuge(lpData,size); y7-daek
bf.Close(); =aCd,4B}
nCount++; 4ad-'
} Tk:%YS;=
GlobalFreePtr(lpData); ~NBlJULS
if(nCount==1) Oz4yUR
m_Number.Format("%d picture captured.",nCount); u=&$Z
else =:(<lKf,<F
m_Number.Format("%d pictures captured.",nCount); Azag*M?
UpdateData(FALSE); eJ_$Etc
} 4{#0ci{
-|(
q9B
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ggHz-oNY
{ ](SqLTB+?
if(pMsg -> message == WM_KEYDOWN) ]tc
Cr;
{ .y2np
if(pMsg -> wParam == VK_ESCAPE) 4]m?8j)
6b
return TRUE; Q0(3ps~H
if(pMsg -> wParam == VK_RETURN) k?`Q\
return TRUE; /9(8ML#E
} 2hFOwI
return CDialog::PreTranslateMessage(pMsg); C0-,<X
} ;;<[_gp,E
>IEc4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zD):
yEc
{ EBx!q8zz
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e*hCf5=-
SaveBmp(); e\WG-zi/
return FALSE; W0s3nio
} p0@l581
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {^6<Ohe4j
CMenu pop; _v +At;Y
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); a.B<W9$`
CMenu*pMenu=pop.GetSubMenu(0); {z*`*
O@
pMenu->SetDefaultItem(ID_EXITICON); 8Lh[>|~=
CPoint pt; &d&nsQ
GetCursorPos(&pt); N7}yU~j^
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'jjJ[16"d
if(id==ID_EXITICON) 1j\wvPLr
DeleteIcon(); }(v <f*7=n
else if(id==ID_EXIT) S'(Hl}h!.
OnCancel(); @+(a{%~7y
return FALSE; c*Q6k<SKR
} apd"p{
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =(Wl'iG
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _{48s8V
AddIcon(); 8e}8@[h
return res; L0>w|LpRc
} nWsR;~pK
Vho^a:Z9}W
void CCaptureDlg::AddIcon() g33Y]\
{ @j+X>TD
NOTIFYICONDATA data; sT+\
z
data.cbSize=sizeof(NOTIFYICONDATA); ?J's>q^X
CString tip; #u$ Z/,
tip.LoadString(IDS_ICONTIP); A^@,Ha
data.hIcon=GetIcon(0); VQHQvFRZ)
data.hWnd=GetSafeHwnd(); GL8 N!,
strcpy(data.szTip,tip); B6"pw0
data.uCallbackMessage=IDM_SHELL; )`-vN^1S-
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; of>}fJ_p
data.uID=98; H'wh0K(
Shell_NotifyIcon(NIM_ADD,&data); 6I~{~YvB"
ShowWindow(SW_HIDE); Y"'k $jS-
bTray=TRUE; xD4G(]d!
} `]m/za%7
jW0aIS2O
void CCaptureDlg::DeleteIcon() 8b:\@]g$
{ wm
s@1~I
NOTIFYICONDATA data; rKr2 K'
data.cbSize=sizeof(NOTIFYICONDATA); IXt cHAgX
data.hWnd=GetSafeHwnd(); UCS`09KNJ
data.uID=98; =%R|@lz_x
Shell_NotifyIcon(NIM_DELETE,&data); f f_| 3G
ShowWindow(SW_SHOW); $-;x8O]u
SetForegroundWindow(); A3mS Sc6
ShowWindow(SW_SHOWNORMAL); k80!!S=_>
bTray=FALSE; b%M|R%)]
} [Se0+\,&
8!VFb+
void CCaptureDlg::OnChange() 6 jo+i[h
{ ?KtvXTy{m
RegisterHotkey(); <nE |Y@S
} <n|.Z-gF\
Q5pm^X._j
BOOL CCaptureDlg::RegisterHotkey() Cd51.Sk(l
{ ,Z p9,nf
UpdateData(); :R9 DJh\
UCHAR mask=0; 5"8R|NU:\0
UCHAR key=0; p:gM?2p1
if(m_bControl) E!v^j=h$u
mask|=4; Mq2[^l!qu
if(m_bAlt) Trwk9 +
mask|=2; MtIhpTX
if(m_bShift) ZeP3
Yjr3
mask|=1; TLiA>`r=
key=Key_Table[m_Key.GetCurSel()]; B#9T6|2
if(bRegistered){ +yYSp8>
DeleteHotkey(GetSafeHwnd(),cKey,cMask); (y{nD~k
bRegistered=FALSE; >m&r,z
} PmT,*C`/X
cMask=mask; ufWd)Q
cKey=key; }%I)bU
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9\[A%jp#K@
return bRegistered;
gC}D0l[
} 'P5|[du+
Afq?Ps+
四、小结 ~\D
H[Mt
g w`}eA$
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。