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:
?V{k\1A
{''|iwLr 一、实现方法
) ]%9Tgn `JE>GZY 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:
4'd{H
Rs #LN
I&5 #pragma data_seg("shareddata")
\i,cL)HM HHOOK hHook =NULL; //钩子句柄
-PnC^r0L$ UINT nHookCount =0; //挂接的程序数目
HEuM"2{DMM static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
$&C(oh$: static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
IP'igX static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
)a^Yor)o" static int KeyCount =0;
uTU4Fn\$L static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
6oP{P_Pxi #pragma data_seg()
h3kHI?jMWG tRy
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。
FR}H$R7# `Q&]dE= DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
&1p8#i +r0eTP=zf BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
4{DeF@@ cKey,UCHAR cMask)
bS<@Rd{g {
Jrk^J6aa BOOL bAdded=FALSE;
YSV,q@I&1 for(int index=0;index<MAX_KEY;index++){
X}*o[;2G if(hCallWnd[index]==0){
5|R2cc|"9 hCallWnd[index]=hWnd;
|\a:]SlH HotKey[index]=cKey;
Xo@YTol HotKeyMask[index]=cMask;
KCk?)Qv bAdded=TRUE;
S(J\<)b KeyCount++;
x
ctU.)p break;
Idlu1g }
t%U[\\ic }
A(n=kx return bAdded;
m"G N^V7 }
"k-ov9yK //删除热键
q~J
oGTv BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
z}1xy+ {
>'6GcnEb4. BOOL bRemoved=FALSE;
7I(t,AKJ for(int index=0;index<MAX_KEY;index++){
-m160k3 if(hCallWnd[index]==hWnd){
aE BP9RX}z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{F:v$ K hCallWnd[index]=NULL;
iw
fp' HotKey[index]=0;
w"v'dU^ HotKeyMask[index]=0;
}%YHm9) bRemoved=TRUE;
]VWfdG KeyCount--;
}Hz-h4Z break;
QWHy=(! }
,GX~s5S8 }
jAK{<7v4U }
#tZf>zrs return bRemoved;
AD@PNM }
u7"VeTz r%l%yCH mY`]33??v DLL中的钩子函数如下:
cIr1"5POXK wz+5
8( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
0sd-s~; {
+V9B BOOL bProcessed=FALSE;
P!y`$Ky& if(HC_ACTION==nCode)
yK077zH_ {
atf%7}2 if((lParam&0xc0000000)==0xc0000000){// 有键松开
WkaR{{nM switch(wParam)
=u8D!AxT {
fT3*>^Uv case VK_MENU:
ZB[(Tv1 MaskBits&=~ALTBIT;
T@|l@xm~L break;
+oy&OKCa case VK_CONTROL:
|WAD $3 MaskBits&=~CTRLBIT;
V+qJrZ,i break;
g6g$nY@Jm case VK_SHIFT:
lmQ 6X MaskBits&=~SHIFTBIT;
#jZ@l3 break;
5ttMua <G? default: //judge the key and send message
KO|pJ3 break;
"W@XP+POAY }
C,r`I/; for(int index=0;index<MAX_KEY;index++){
h4anr7g{ if(hCallWnd[index]==NULL)
:B=8_M continue;
NGD*ce"w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q0cY/'>4 {
ck+b/.gw` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qon{
g bProcessed=TRUE;
L"foL }
C4{\@v}t }
VI24+h'J }
)_8}53C else if((lParam&0xc000ffff)==1){ //有键按下
S9p?* switch(wParam)
h `ME(U~<< {
BMNr<P2li case VK_MENU:
*AH^%!kVP MaskBits|=ALTBIT;
[8@kx Cq break;
\E@s_fQ] case VK_CONTROL:
>{m2E8U0 MaskBits|=CTRLBIT;
iS1Gb$? break;
1s`)yu^`v case VK_SHIFT:
U,<]J*b(@4 MaskBits|=SHIFTBIT;
w,Z"W;| break;
6<Z*Tvk{C default: //judge the key and send message
PXosFz~ break;
k(EMp1[:nN }
ALd]1a& for(int index=0;index<MAX_KEY;index++){
]jc_=I6) if(hCallWnd[index]==NULL)
Xlv#=@;O] continue;
1OJ*wI* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|mxNUo- {
S<nP80C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
:p<kQ4
bProcessed=TRUE;
X0WNpt&h }
PW%1xHLfk }
b,s Gq }
WRD
A ` if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
2@ 9pr for(int index=0;index<MAX_KEY;index++){
Sty!atEWT if(hCallWnd[index]==NULL)
cJ(BiL-uF continue;
fxDj+Q1p if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
)nwZ/&@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
qL|
5-(P //lParam的意义可看MSDN中WM_KEYDOWN部分
AJyq>0p }
aDL)|>"Q }
:N@U[Wx0A }
%bP~wl~ return CallNextHookEx( hHook, nCode, wParam, lParam );
MZ|\S/ }
Yb[n{.%/g zF5q=9 4$ 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:
\=!H 2M 5`{vE4A]q BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
p jKt:R} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
mG)8U{L M$Fth*q{GD 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
J&eAL3"GF N = LM?(H LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
9Ct_$.Q. {
W+gpr|R2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
4xm&pQo{V6 {
A&?}w_|9 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
x;]x_fz SaveBmp();
Ge~q3" return FALSE;
E4+b-?PB~ }
Ic'Q5kfM …… //其它处理及默认处理
R]u
(l+` }
lv4(4$T 90~*dNk -~
0] 7Cpl 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
{6'*Phw W`$[j0 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。
0
y<k][ &hayR_F9 二、编程步骤
cd!|Ne>fe W57&\PXYn 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";
kMy<G8 s |olNA*4 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
0p-#f|ET 9\v.qo. 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;
~m=$VDWm S'o ]=& 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
.Y1bY := 2FGx _Y 5、 添加代码,编译运行程序。
2MuO*.9D ga-{!$b* 三、程序代码
HsnG4OE \c{R <Hh ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
BCx!0v?9 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
`<^*jB@P #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
u_.HPA #if _MSC_VER > 1000
6xarYh( #pragma once
iJ)0Y~ #endif // _MSC_VER > 1000
ivfXat- #ifndef __AFXWIN_H__
#{x5L^v>] #error include 'stdafx.h' before including this file for PCH
@l~7x #endif
%M9;I #include "resource.h" // main symbols
zPVd(V~(T class CHookApp : public CWinApp
KmQ^?Ad-C {
LeSHRoD public:
lUv =7"
[ CHookApp();
1}!L][( // Overrides
P-'_}*wxi // ClassWizard generated virtual function overrides
s~J=<)T*6 //{{AFX_VIRTUAL(CHookApp)
h4(JUio public:
DLi?'K3t virtual BOOL InitInstance();
"jR]MZ virtual int ExitInstance();
txq~+'A:+ //}}AFX_VIRTUAL
G2]^F Y //{{AFX_MSG(CHookApp)
L/?]^!. // NOTE - the ClassWizard will add and remove member functions here.
3OP.12^ // DO NOT EDIT what you see in these blocks of generated code !
p0M=t- //}}AFX_MSG
(#o t^ DECLARE_MESSAGE_MAP()
!v9lk9SV };
O8lFx_N7Q LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
n 'K6vW3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
FLZS K:3B] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
J &YQ]l BOOL InitHotkey();
=i>\2J%'R BOOL UnInit();
_s+c+]bO #endif
-[DWM2C$K4 @2
=z}S3O //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7Fz
xe$A #include "stdafx.h"
ES}. xZ#~ #include "hook.h"
]JjK#eh #include <windowsx.h>
8o|P&q(v* #ifdef _DEBUG
|]W2EV ,b #define new DEBUG_NEW
#?Mj$ZB #undef THIS_FILE
k4{:9zL1#? static char THIS_FILE[] = __FILE__;
~Ky4+\6o> #endif
!][F #define MAX_KEY 100
_BS
9GB #define CTRLBIT 0x04
7,'kpyCj #define ALTBIT 0x02
{%b
}Z2
#define SHIFTBIT 0x01
Jdj?I'XtY #pragma data_seg("shareddata")
|~K(F<;j HHOOK hHook =NULL;
oM,- VUr UINT nHookCount =0;
iW;i!, static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
5~+XZA#2 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
NTmi 2c static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
WUEHB static int KeyCount =0;
dMvp&M\\' static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
nY_?Jq #pragma data_seg()
#@qN8J}R HINSTANCE hins;
OeElMRU" void VerifyWindow();
SfB8!V|; BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
m"d/b~q //{{AFX_MSG_MAP(CHookApp)
uzBz}<M= // NOTE - the ClassWizard will add and remove mapping macros here.
?j{C*|yHO // DO NOT EDIT what you see in these blocks of generated code!
OBOwz4< //}}AFX_MSG_MAP
=o^|b ih END_MESSAGE_MAP()
WeMAe
w/d sx
9uV CHookApp::CHookApp()
A:# k {
=Z,5$6%) // TODO: add construction code here,
M#,Q
^rH# // Place all significant initialization in InitInstance
H&4~Uo.5 }
Rc[ 0aj: zY=jXa)K~ CHookApp theApp;
A\QJLWBv^$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7:Ztuc] {
'6-$Xq0^E BOOL bProcessed=FALSE;
o3N] `xD' if(HC_ACTION==nCode)
$_D6_|HK {
6f)2 F<
7 if((lParam&0xc0000000)==0xc0000000){// Key up
v]"L]/" switch(wParam)
KE}H&1PjU {
s B
20/F case VK_MENU:
edvFQ#,d MaskBits&=~ALTBIT;
+?m0Q;%b break;
]lBGyUJn case VK_CONTROL:
6bO~/mpWT~ MaskBits&=~CTRLBIT;
{Wv%zA*8 break;
>v+jh(^ case VK_SHIFT:
0Scm?l3 MaskBits&=~SHIFTBIT;
\9{F5Sz break;
E167=BD9< default: //judge the key and send message
e3[:D5 break;
:c.JhE3D }
6'C2SihYp for(int index=0;index<MAX_KEY;index++){
Y[
zZw~yx if(hCallWnd[index]==NULL)
V[;M&=," continue;
y\c"b-lQX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,Zf
9RM {
q]% T:A= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/rc%O*R bProcessed=TRUE;
_.V?A* }
Sq2P-y!w }
?1I GYyu! }
3l1cyPv else if((lParam&0xc000ffff)==1){ //Key down
kkCZNQ~I switch(wParam)
3Q By\1h. {
BiwieF4x case VK_MENU:
!mJo'K MaskBits|=ALTBIT;
)2e#HBnH break;
qu|i;WZE case VK_CONTROL:
ZC0-wr\ MaskBits|=CTRLBIT;
g"_C,XN break;
`#mK*Buem} case VK_SHIFT:
oG oK, MaskBits|=SHIFTBIT;
FMw&( break;
'0RwO[A#1 default: //judge the key and send message
\2C`<h$fN break;
_D,
;MB&7 }
NjuiD]. for(int index=0;index<MAX_KEY;index++)
Iah[j,]r {
tt_o$D~kg if(hCallWnd[index]==NULL)
9N8I
ip]w continue;
M8&}j if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G$M9=@Ug {
'lz"2@4{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
kOL'|GgK bProcessed=TRUE;
RFaSwf,5n }
Cby;?F6w }
Z|lU8`'5 }
XGrue6ya if(!bProcessed){
23\RJpKb for(int index=0;index<MAX_KEY;index++){
g"VMeW^ if(hCallWnd[index]==NULL)
NAC_pM&B continue;
p=Q0!!_r if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
TUK"nKSZ`. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
wK_]/Q-L }
Z8O n%Mx{" }
`)iY}Iu }
&[Xu!LP return CallNextHookEx( hHook, nCode, wParam, lParam );
4,Ic}CvM }
"SxLN
8.: K>Fqf
+_ BOOL InitHotkey()
bUwn}_7b {
2}6%qgnT- if(hHook!=NULL){
l |2D/K5 nHookCount++;
SLL3v,P(7 return TRUE;
/1UOT\8U }
#6v27:XK else
'dG%oDHX]P hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
;bzX%f?|G if(hHook!=NULL)
2F{hg% nHookCount++;
Ex amD">T return (hHook!=NULL);
Uu
s. }
/^SAC%PD BOOL UnInit()
S[3iA~)Z- {
XN=67f$Hw if(nHookCount>1){
>et-{(G nHookCount--;
*iO u' return TRUE;
tC?=E#3V }
n:
ui BOOL unhooked = UnhookWindowsHookEx(hHook);
5|0,X<& if(unhooked==TRUE){
MM_k
]-7 nHookCount=0;
#p(h]T32 hHook=NULL;
_9 .(a }
r|Z3$J{^" return unhooked;
$``1PJoi }
!LMN[3M_ +j_;(Gw7 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|y;}zQB-dH {
3981ie BOOL bAdded=FALSE;
VZr>U*J[: for(int index=0;index<MAX_KEY;index++){
{Bs~lC$ if(hCallWnd[index]==0){
QfM zF hCallWnd[index]=hWnd;
OVzt\V*+%W HotKey[index]=cKey;
e~%
;K4 HotKeyMask[index]=cMask;
Pt:e!qX) bAdded=TRUE;
M-L2w" KeyCount++;
-H^oXeN break;
mYN7kYR}<` }
<#=N
m0S$ }
/@ !CKh` return bAdded;
:o-,SrORM }
Ei}/iBG@ :K`ESq!8u BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
RoA?p;]< {
W:,4 :|3 BOOL bRemoved=FALSE;
9O`
m,t for(int index=0;index<MAX_KEY;index++){
`pf4X/Py if(hCallWnd[index]==hWnd){
6oaazB^L if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
h!~3Dw>,N hCallWnd[index]=NULL;
d<!3`qe HotKey[index]=0;
3`d}~v{ HotKeyMask[index]=0;
?_x
q- bRemoved=TRUE;
b5$JfjI KeyCount--;
[ylsz? break;
nkxzk$ }
Hgeg@RP
Q }
>^q7c8]~g }
XZ&KR.C, return bRemoved;
+d+@u)6 }
w\54j)rb F>tQn4 void VerifyWindow()
h5%<+D< {
(Fq5IGs for(int i=0;i<MAX_KEY;i++){
O ,rwP if(hCallWnd
!=NULL){ +a&p$\
if(!IsWindow(hCallWnd)){ /kL$4CA
hCallWnd=NULL; iLP7!j
HotKey=0; Tus}\0/i>
HotKeyMask=0; |b-9b&
KeyCount--; `p;eIt
} 0q>P~]Ow
} D']ZlB'K
} bwVPtu`
} yKYUsp
5>3}_
BOOL CHookApp::InitInstance() d(vsE%/!
{ EXP%Mk/
AFX_MANAGE_STATE(AfxGetStaticModuleState()); =U8a ?0
hins=AfxGetInstanceHandle(); {Q+gZcu
InitHotkey(); )1N 54FNO
return CWinApp::InitInstance(); w%WF-:u7|
} @L.82p{h
Um1[sMc{au
int CHookApp::ExitInstance() Z3>N<u8)
{ a#mNE*Dg
VerifyWindow(); F'g Vzf
UnInit(); ]\/tVn.'
return CWinApp::ExitInstance(); jV.g}F+1m
} 4}_O`Uxh
Gl1jxxd
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,Jc m+Wb
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^w ] /
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lb'GXd %
#if _MSC_VER > 1000 vN2u34
#pragma once d(g^M1m
#endif // _MSC_VER > 1000 F+ E|r6'i
*f,DhT/P
class CCaptureDlg : public CDialog J]m{b09F
{ ??n*2s@t
// Construction /Q,{?';~
public: $P1O>x>LIL
BOOL bTray; Q{k
At%
BOOL bRegistered; 8G5Da|\
BOOL RegisterHotkey(); zBO(`=|
UCHAR cKey; [((;+B
UCHAR cMask; IbcZ@'RSw
void DeleteIcon(); -n'F v@U
void AddIcon(); d
Le-nF
UINT nCount; .{;Y'Zc14S
void SaveBmp(); RI68%ZoL
CCaptureDlg(CWnd* pParent = NULL); // standard constructor sXd8rj:o
// Dialog Data rr#K"SP
//{{AFX_DATA(CCaptureDlg) ;raN
enum { IDD = IDD_CAPTURE_DIALOG }; B||;'
CComboBox m_Key; .VTy[|o
BOOL m_bControl; Lm@vXgMD
BOOL m_bAlt; "V&+7"Q
BOOL m_bShift; `"qP
CString m_Path; 5,)Qw
CString m_Number; LH:i| I
//}}AFX_DATA (`? y2n)~W
// ClassWizard generated virtual function overrides /y^7p9Z`
//{{AFX_VIRTUAL(CCaptureDlg) Oy 2+b1{
public: j5
g# M
virtual BOOL PreTranslateMessage(MSG* pMsg); + >cBVx6
protected: N}\[Gr
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zG e'*Qei
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /r12h|
//}}AFX_VIRTUAL v)2M1
// Implementation K}=|.sE9
protected: b)9'bJRvU
HICON m_hIcon; S(\9T1DVe
// Generated message map functions -=.V
'
//{{AFX_MSG(CCaptureDlg) ?<6CFH]
virtual BOOL OnInitDialog(); l4TpH|k
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wH~kTU2br
afx_msg void OnPaint(); 3Vp#a:
afx_msg HCURSOR OnQueryDragIcon(); 0flg=U9
virtual void OnCancel(); Ela-,(Glk
afx_msg void OnAbout(); M-i_#EWP
afx_msg void OnBrowse();
-Ij&
afx_msg void OnChange(); rHP%0f9:
//}}AFX_MSG V7TVt,-3
DECLARE_MESSAGE_MAP() u*qV[y5Bl
}; tgjr&G}a@0
#endif z5W@`=D
<cA/<3k)
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file J)mhu}
#include "stdafx.h" %F kMv
#include "Capture.h" 4(-bx.V
#include "CaptureDlg.h" 1 { , F
#include <windowsx.h> J[^}u_z
#pragma comment(lib,"hook.lib") Fq9Q+RNMZL
#ifdef _DEBUG zD3mX<sw
#define new DEBUG_NEW 9<Kj6t_
#undef THIS_FILE +:3*
static char THIS_FILE[] = __FILE__; gIA@l`"
#endif V'w@rc\XN
#define IDM_SHELL WM_USER+1 w&xDOyW]
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O$IjNx
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3BpZX`l*p
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D~o$GW%
class CAboutDlg : public CDialog N41 R
{ n ]dL?BJ
public: nYbhy}y
CAboutDlg(); QMEcQV>
// Dialog Data (|wz7AY2
//{{AFX_DATA(CAboutDlg) R0oKbs{
enum { IDD = IDD_ABOUTBOX }; WW~+?g5
//}}AFX_DATA G|\^{5
// ClassWizard generated virtual function overrides f<A5?eKw
//{{AFX_VIRTUAL(CAboutDlg) .Vq)zi1<
protected: ]tY
^0a
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &CwFdx:Ff
//}}AFX_VIRTUAL r=c<--_@
// Implementation N25V]
protected: Qv-@Zt!8
//{{AFX_MSG(CAboutDlg) 97)/"i e
//}}AFX_MSG :W@#) 1=
DECLARE_MESSAGE_MAP() Kt0(gQOr0
}; ?'"X"@r5
U\rh[0
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y,pZTlE
{ N?X~ w <
//{{AFX_DATA_INIT(CAboutDlg) 1,5E`J
//}}AFX_DATA_INIT h=_mNG>R)
} @(C1_
GElvz'S~
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9M"].~iNE
{ W5#611
CDialog::DoDataExchange(pDX); I7^zU3]Ul
//{{AFX_DATA_MAP(CAboutDlg) pu,?<@0YK
//}}AFX_DATA_MAP 0EJ(.8hwm
} 7)%+=@
67y Tvr@a
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) US
//{{AFX_MSG_MAP(CAboutDlg) hQNe;R5
// No message handlers .G o{1[
//}}AFX_MSG_MAP F7")]q3I~
END_MESSAGE_MAP() ;O<9|?
gl&5l1&
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h~wi6^{&Y
: CDialog(CCaptureDlg::IDD, pParent) I}2P>)K
{ )!tK[K?5
//{{AFX_DATA_INIT(CCaptureDlg) .Yw'oYnS
m_bControl = FALSE; F ]O$(7*
m_bAlt = FALSE; Su 5>$
m_bShift = FALSE; lD{Aa!\
m_Path = _T("c:\\"); ?uMQP NYs
m_Number = _T("0 picture captured."); {D g_?._d
nCount=0; HHjt/gc}`
bRegistered=FALSE; l1]p'Liuu
bTray=FALSE; s}onsC
//}}AFX_DATA_INIT `<[6YH_
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z6py"J@
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /.M+fr S
} <W]g2>9o9
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -)vEWn$3<
{ 2YuN~-
CDialog::DoDataExchange(pDX); %&
_V0R\k
//{{AFX_DATA_MAP(CCaptureDlg) exdx\@72
DDX_Control(pDX, IDC_KEY, m_Key); nADX0KI
DDX_Check(pDX, IDC_CONTROL, m_bControl); X,8<oX1r
DDX_Check(pDX, IDC_ALT, m_bAlt); TPhTaKCio
DDX_Check(pDX, IDC_SHIFT, m_bShift); _ pO `
DDX_Text(pDX, IDC_PATH, m_Path); g/CxXSv@0
DDX_Text(pDX, IDC_NUMBER, m_Number); 5'a3huRtV
//}}AFX_DATA_MAP
b3YO!cJ
} |y<),j6
5d@t7[]
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2BCtJ`S`
//{{AFX_MSG_MAP(CCaptureDlg) 5sPywk{
ON_WM_SYSCOMMAND() LI)!4(WH
ON_WM_PAINT() tRpEF2
ON_WM_QUERYDRAGICON() %zU`XVNN+
ON_BN_CLICKED(ID_ABOUT, OnAbout) =uDgzdDyE
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <}6{{&mT4
ON_BN_CLICKED(ID_CHANGE, OnChange) Jgu94.;5
//}}AFX_MSG_MAP 1c+]gIe
END_MESSAGE_MAP() {YUIMd!Y
!EQ@#qW/
BOOL CCaptureDlg::OnInitDialog() 3sCFHn#c
{ 4em;+ >D6
CDialog::OnInitDialog(); r6'UUu
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S(aZ4{a@
ASSERT(IDM_ABOUTBOX < 0xF000); t:LcNlN|
CMenu* pSysMenu = GetSystemMenu(FALSE); VOsqJJ3
if (pSysMenu != NULL) p$7#}s
{ D|qk_2R%
CString strAboutMenu; /m _kn
strAboutMenu.LoadString(IDS_ABOUTBOX); V#ev-\k}@
if (!strAboutMenu.IsEmpty()) -G,^1AL>
{ [Pe#kzLX
pSysMenu->AppendMenu(MF_SEPARATOR); +jC*'7p@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1+`l7'F
}
htY=w}>
} C6_@\&OA
SetIcon(m_hIcon, TRUE); // Set big icon
_if|TFw;h
SetIcon(m_hIcon, FALSE); // Set small icon {2`=qt2
m_Key.SetCurSel(0); }6 5s'JB
RegisterHotkey(); 63?)K s
CMenu* pMenu=GetSystemMenu(FALSE); @5)
8L/[l
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xyr+_k-x&q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (wmBjQ]B<
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);
wiX ~D
return TRUE; // return TRUE unless you set the focus to a control 9{j66
} c.\O/N
9t@:4O
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) i~J;G#b
{ YGc^h(d
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^% Q|s#w.
{ B~'MBBD"
CAboutDlg dlgAbout; 0:KE@=
dlgAbout.DoModal(); (yo;NKq,@
} <ktzT&A
else )x#5Il
H
{ ]<DNo&fw
CDialog::OnSysCommand(nID, lParam); Pag63njg?
} a'\By?V]
} ')S;[= v
vhr+g 'tf
void CCaptureDlg::OnPaint() 6{d6s#|%
{ U-wLt(Y<
if (IsIconic()) t)oa pIeIe
{ "x'),
CPaintDC dc(this); // device context for painting B@Nt`ky0*
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h?\2_s
// Center icon in client rectangle S~$'WA
int cxIcon = GetSystemMetrics(SM_CXICON); :PbDU$x
int cyIcon = GetSystemMetrics(SM_CYICON); Vv$HR
CRect rect; 0%s|Zbo!>
GetClientRect(&rect); nRhrWS
int x = (rect.Width() - cxIcon + 1) / 2; q^rl)
int y = (rect.Height() - cyIcon + 1) / 2; *5$&`&,
// Draw the icon AgF5-tz6x
dc.DrawIcon(x, y, m_hIcon); +)nT|w45
} iV.p5FD
else .'[/|4H
{ M^rM-{?<
CDialog::OnPaint();
>95TvJ
} Hg}I]!B
} {mE! Vf
V's:>;
HCURSOR CCaptureDlg::OnQueryDragIcon() XC15 K@K
{ FDFH,J`_
return (HCURSOR) m_hIcon; RaSz>-3d
} e2$]g>
:<#`_K~'
void CCaptureDlg::OnCancel() gM;}#>6
{ XM
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if(bTray) [AEBF2OIv
DeleteIcon(); o7&4G$FX~
CDialog::OnCancel(); BdbJ< Is
} FqA3{
D
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void CCaptureDlg::OnAbout() sPNfbCOz
{ (g :p5Rl
CAboutDlg dlg; -'rj&x{Q)U
dlg.DoModal(); ")s!L"x
} d_}a`H
HW=xvA+
void CCaptureDlg::OnBrowse() "C%!8`K{a*
{ cTZ)"^z!
CString str; b'>8ZIY
BROWSEINFO bi; wCZO9sU:6=
char name[MAX_PATH]; |pZo2F!.
ZeroMemory(&bi,sizeof(BROWSEINFO)); gvli %9n
bi.hwndOwner=GetSafeHwnd(); d&:H&o)T!
bi.pszDisplayName=name; >Pe:I
bi.lpszTitle="Select folder"; P#GD?FUc
bi.ulFlags=BIF_RETURNONLYFSDIRS; {7Cx#Ewd
LPITEMIDLIST idl=SHBrowseForFolder(&bi); e/e0d<(1
if(idl==NULL) dhRJg"vrQ
return; 7INk_2
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); a
ib}`l
str.ReleaseBuffer(); h"QbA"
m_Path=str; c|wCKn}`
if(str.GetAt(str.GetLength()-1)!='\\') VlW9UF-W
m_Path+="\\"; 'zSgCgCHX8
UpdateData(FALSE); hQh9ok8S
} <D /a l9
ucg$Ed
void CCaptureDlg::SaveBmp() 1JTbCS
{ .PVLWW
CDC dc; sz09+4h#
dc.CreateDC("DISPLAY",NULL,NULL,NULL); si/er"&o
CBitmap bm; qc!xW,I
int Width=GetSystemMetrics(SM_CXSCREEN); 4sY[az
int Height=GetSystemMetrics(SM_CYSCREEN); 9rj('F&1
bm.CreateCompatibleBitmap(&dc,Width,Height); OKY+M^PP
CDC tdc; f[/.I,9U^
tdc.CreateCompatibleDC(&dc); >M^&F6
CBitmap*pOld=tdc.SelectObject(&bm); vrcE]5(:s
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); fDuwgY0
tdc.SelectObject(pOld); q
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BITMAP btm; *Jnh";~b
bm.GetBitmap(&btm); |paP<$
DWORD size=btm.bmWidthBytes*btm.bmHeight; `\FI7s3b
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); . A<sr
BITMAPINFOHEADER bih; +80 2`eax
bih.biBitCount=btm.bmBitsPixel; iV)ac\
bih.biClrImportant=0; UC9{m252
bih.biClrUsed=0; !y vJpdsof
bih.biCompression=0; (:?&G9k
"
bih.biHeight=btm.bmHeight; 'tWAu I
bih.biPlanes=1; o<4D=.g7D
bih.biSize=sizeof(BITMAPINFOHEADER); y/4ny,s"
bih.biSizeImage=size; WEa>)@
bih.biWidth=btm.bmWidth; Md9l+[@
bih.biXPelsPerMeter=0; CV^0.
bih.biYPelsPerMeter=0; ]xq::a{Oy
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (DJvi6\H
static int filecount=0; cb+y9wA
CString name; QaMDGD
name.Format("pict%04d.bmp",filecount++); z}5<$K_U
name=m_Path+name; )bW5yG!
BITMAPFILEHEADER bfh; \.>.c g
bfh.bfReserved1=bfh.bfReserved2=0; g37q/nEv
bfh.bfType=((WORD)('M'<< 8)|'B'); G*\sdBW!k
bfh.bfSize=54+size; _'JRo%{xGX
bfh.bfOffBits=54; ^pcRW44K
CFile bf; ?iln<%G
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ZO7bSxAN-
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ex,JB +
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {% F`%_{"
bf.WriteHuge(lpData,size); npj/7nZj
bf.Close(); Pf8u/?/
nCount++; fNxw&ke8&
} :HZ;Po
GlobalFreePtr(lpData); _'c+fG
\
if(nCount==1) %8Yyj{^!(
m_Number.Format("%d picture captured.",nCount); _W9&J&l0so
else *-z4 <LAa
m_Number.Format("%d pictures captured.",nCount); 94z8B;+H]
UpdateData(FALSE); qz:]-A
} A7'b Nd6f9
5^F]tRz-
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fOW_h
{ i`~~+6`J
if(pMsg -> message == WM_KEYDOWN) + zDc
{ 6$z'wy/*
if(pMsg -> wParam == VK_ESCAPE) X8b#[40:
return TRUE; {bTeAfbf]
if(pMsg -> wParam == VK_RETURN) n#>5?W
return TRUE; `cO|RhD@
} *aG"+c6|
return CDialog::PreTranslateMessage(pMsg); *:#Z+7x
]
} Qu}N:P9l?X
h2&y<Eg >
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vi,Y@+4
{ Y`]rj-8f0B
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c(:Oyba
SaveBmp(); q2Rf@nt
return FALSE; $`Rxn*}V4#
} #7C6yXb%
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VKf6|ae
CMenu pop; BvI 0v:
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); CXa Ld7nMX
CMenu*pMenu=pop.GetSubMenu(0); sy.:T]ZH
pMenu->SetDefaultItem(ID_EXITICON); cKpQr7]ur
CPoint pt; AY@k-4
GetCursorPos(&pt); 5Jd`
^U
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kd`YSkZ
if(id==ID_EXITICON) EP0a1.C
DeleteIcon(); OequU'j
else if(id==ID_EXIT) C M^r|4K
OnCancel(); >Qk97we'9
return FALSE; ER2V*,n@
} ~,G]glu8
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?1$\pq^
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) HSql)iT
AddIcon(); }+JLn%H)
return res; e#m1X6$.e
} ?Hk.|5A}
@|'Z@>!/pV
void CCaptureDlg::AddIcon() wNR=?Z~
{ /gX%ABmS
NOTIFYICONDATA data; 'F<Sf:?.p
data.cbSize=sizeof(NOTIFYICONDATA); 5E.vje{U;
CString tip; U5clQiow
tip.LoadString(IDS_ICONTIP); No~6s.H
data.hIcon=GetIcon(0); =ty2_6&>
data.hWnd=GetSafeHwnd(); K]MzP|T,
strcpy(data.szTip,tip); ;Lqm#]C
data.uCallbackMessage=IDM_SHELL; I2W{tl
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :^.u-bHI
data.uID=98; b8e*Pv/
Shell_NotifyIcon(NIM_ADD,&data); CL )%p"[x
ShowWindow(SW_HIDE); _UaPwJ
bTray=TRUE; XJ
_%!
} ZgK@Fl*k
'1lx{UzD
void CCaptureDlg::DeleteIcon() G-sa
L*
{ |/t K-c6J
NOTIFYICONDATA data; JQr36U
data.cbSize=sizeof(NOTIFYICONDATA); ]ci RiMkT(
data.hWnd=GetSafeHwnd(); "|\94
data.uID=98; 3} l;
Shell_NotifyIcon(NIM_DELETE,&data); z(r"JNO@
ShowWindow(SW_SHOW); [@zkv)D6
SetForegroundWindow(); )Jmw|B
ShowWindow(SW_SHOWNORMAL); 8vu2k>
bTray=FALSE; vo.EM1x
} hOV_Oqe4?
eNivlJ,K|@
void CCaptureDlg::OnChange() <%(f9j
{ 7%X+O8
RegisterHotkey(); fA;x{0CAMX
} m9uUDq#GJ
75PS^5T,
BOOL CCaptureDlg::RegisterHotkey() oX2r?.j#M
{ )y5iH){!
UpdateData(); gMCy$+?
UCHAR mask=0; a3*.,%d
UCHAR key=0; _5Bu [I
if(m_bControl) })q]gMj
mask|=4; OY$7`8M[
if(m_bAlt) 9.jG\i
mask|=2; \:C%>
.VG
if(m_bShift) rC~_:uXtE
mask|=1; ,Qga|n8C
key=Key_Table[m_Key.GetCurSel()]; ^75pV%<%
if(bRegistered){ QK,=5~I J
DeleteHotkey(GetSafeHwnd(),cKey,cMask); C?bXrG\
bRegistered=FALSE; YALyZ.d
} +)% ,G@-`
cMask=mask; _%XbxP6rH
cKey=key; eN Hpgj
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "ngSilH?D
return bRegistered; [+yGDMLs
} ,CN#co
?#x'_2
四、小结 N" 8*FiZ|
F1zT )wW
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。