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:
O',Vce$
1]69S( 一、实现方法
+}R#mco5K -nXlW 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:
}Xvm(
; DS=$*
Trk #pragma data_seg("shareddata")
`vZX"+BAh HHOOK hHook =NULL; //钩子句柄
#MFIsx)r UINT nHookCount =0; //挂接的程序数目
=;"=o5g_ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Bmt^*;WY+ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
iD*L<9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
-}_1f[b static int KeyCount =0;
d}Q%I static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
pO92cGJ8 #pragma data_seg()
R,ZG?/#uM9 k(he<-GF\ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
jn(%v] F1meftK DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
9y&bKB2, J6Vx7 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
_"*}8{| cKey,UCHAR cMask)
6H=gura& {
;5DDV6 BOOL bAdded=FALSE;
\PWH(E9 for(int index=0;index<MAX_KEY;index++){
Wdi`ZE if(hCallWnd[index]==0){
0SDnMij&bf hCallWnd[index]=hWnd;
_n1[(I HotKey[index]=cKey;
'o~gT ;T# HotKeyMask[index]=cMask;
Al=ByX @ bAdded=TRUE;
B"8jEYT5 KeyCount++;
t)1`^W} break;
1yVhO2`7] }
MU%7'J :_ }
v7n@CWnN return bAdded;
"}V_.I*+ }
IC?(F]$%> //删除热键
u*/+cT BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
uP+VS>b {
+Qf}&D_ BOOL bRemoved=FALSE;
*YSRZvD<\ for(int index=0;index<MAX_KEY;index++){
|nE4tN#J< if(hCallWnd[index]==hWnd){
/3&MUB*z&y if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
SA7(EJ95 hCallWnd[index]=NULL;
Re&"Q8I.8 HotKey[index]=0;
M*f]d`B HotKeyMask[index]=0;
P?S]Q19Q4 bRemoved=TRUE;
5vg="@O K KeyCount--;
sn"z'=ch break;
xv&h>GOg }
hD=.rDvO }
|c^ ?tR< }
}wkY`" return bRemoved;
<v'&Pk< }
FWA?mde ]IE Z?+F, Ptf(p` DLL中的钩子函数如下:
a>x6n3{ /ywP
0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
e[16
7uU {
z_N";Rn BOOL bProcessed=FALSE;
,yA[XAz~U if(HC_ACTION==nCode)
K{{_qFj@<y {
zCuB+r=C if((lParam&0xc0000000)==0xc0000000){// 有键松开
`CI_zc=jx switch(wParam)
T;?k]4.X {
xJ2I@*DN case VK_MENU:
|R1T;J<[ MaskBits&=~ALTBIT;
i[@13kr break;
yOt#6Vw case VK_CONTROL:
1[T7;i$ MaskBits&=~CTRLBIT;
Qn,6s%n
break;
_&/ {A|n case VK_SHIFT:
IzJq:G. MaskBits&=~SHIFTBIT;
B0%=! & break;
[orL.D] default: //judge the key and send message
[iEz?1., break;
S>r",S }
VX&PkGi?o for(int index=0;index<MAX_KEY;index++){
_bi)d201 if(hCallWnd[index]==NULL)
SI=u-'% continue;
ddyX+.LMk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PO?_i>mA {
!3Pbu=(cte SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!Av9?Q: bProcessed=TRUE;
U(9_&sL }
c(e>Rmh }
p |1u,N }
a5GLbanF else if((lParam&0xc000ffff)==1){ //有键按下
#
)y/aA switch(wParam)
"X8jpg {
- X71JU case VK_MENU:
)+hV+rM jp MaskBits|=ALTBIT;
[IQ|c?DxpL break;
msM1K1er case VK_CONTROL:
&'x~<rx MaskBits|=CTRLBIT;
Rh?bBAn8 break;
~y2zl case VK_SHIFT:
2Jio_Hk MaskBits|=SHIFTBIT;
]Ob|!L( break;
18!y7
_cFT default: //judge the key and send message
##*]2Dy break;
4uo`XJuQ }
[104;g < for(int index=0;index<MAX_KEY;index++){
a9z#l}IQ if(hCallWnd[index]==NULL)
6oNcj_?7?q continue;
~e 1l7H; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ph1XI&us9 {
=i&,I{3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>
'hM"4f bProcessed=TRUE;
8.#{J&h }
iBd6&?E?< }
%^pi }
1(Ta*"(0Ip if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
:t{~Mi=T for(int index=0;index<MAX_KEY;index++){
]MV8rC[\ if(hCallWnd[index]==NULL)
LWN{ continue;
jb-kg</A if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
B-R#?Xn:!I SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
sa(.Anmlj //lParam的意义可看MSDN中WM_KEYDOWN部分
`;E/\eG" }
(
%\7dxiK }
$+!dP{ }
AO$AT_s return CallNextHookEx( hHook, nCode, wParam, lParam );
g4$(%] }
n%s%i-[5B hlaN'j
<C 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
/.Ak'Vmi ]:59c{O BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
^ RA'E@" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
rNii,_ }OL"38P 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
`t&{^ a&Y" @#)` -]g LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"y,YC M` {
Xq*^6*E-} if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/Hyz]46 {
^Tm`motzh //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
.p&@;fZ SaveBmp();
*h!fqT%9 return FALSE;
DH-M|~.sf^ }
IW3k{z …… //其它处理及默认处理
%w*)7@,+- }
fkBL`[v)4 hMDd*<%l h_vTA 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
w +t@G`d hfaU-IPcFX 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
a /sj W [@vz0!@s5 二、编程步骤
CJBf5I3 -{cHp 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
6Dlm.~G *?rWS"B 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qd*}d)! #) aLD0p 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
YAr6cl xH-d<Ht,7 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
*1b|j|5v ,^UqE{ 5、 添加代码,编译运行程序。
;*<tU
n^t c=oDzAzuV\ 三、程序代码
fFjpQ~0 1i y$ n ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
F4EAC|Y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
I,j4 BU4 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
mL{P4a 1xf #if _MSC_VER > 1000
`Y#At3{ #pragma once
l_vGp #endif // _MSC_VER > 1000
z8Q!~NN-K #ifndef __AFXWIN_H__
*qd:f!Q3 #error include 'stdafx.h' before including this file for PCH
`@~e<s`j #endif
Y'iX
#include "resource.h" // main symbols
~t`^|cr| class CHookApp : public CWinApp
H}^ ' {
<v_=k],W public:
:v&[! CHookApp();
SS=<\q#MS // Overrides
>cu%C s=m // ClassWizard generated virtual function overrides
t'eqk#rq //{{AFX_VIRTUAL(CHookApp)
,ks2&e public:
,=:K&5mCv virtual BOOL InitInstance();
+$dJA virtual int ExitInstance();
z%;plMj //}}AFX_VIRTUAL
~VGnE: //{{AFX_MSG(CHookApp)
kQ`tY`3F // NOTE - the ClassWizard will add and remove member functions here.
yn4T!r " // DO NOT EDIT what you see in these blocks of generated code !
xM*_1+<dT$ //}}AFX_MSG
:
\+xXb{ DECLARE_MESSAGE_MAP()
>XD?zF)6 };
Ott6y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
5)k8(kH BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
uN|A}/hr] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
pP. _%5 BOOL InitHotkey();
d7OygDb < BOOL UnInit();
8Bf> #endif
3Vb4zZsl _4ag-'5 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6>>; fy2 #include "stdafx.h"
Kc/1LeAik #include "hook.h"
-aoYoJ ' #include <windowsx.h>
4T@:_G2b #ifdef _DEBUG
[{znwK@ #define new DEBUG_NEW
iNO>'7s7 #undef THIS_FILE
w?Te%/s. static char THIS_FILE[] = __FILE__;
V]=22Cxi'~ #endif
g{8RPw] #define MAX_KEY 100
#2{-6ey #define CTRLBIT 0x04
f98,2I(>`+ #define ALTBIT 0x02
|3*9+4]a #define SHIFTBIT 0x01
jjs/6sSRk #pragma data_seg("shareddata")
z;c>Q\Q HHOOK hHook =NULL;
b$ G{^ UINT nHookCount =0;
1K72}Gj)ZL static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@IT[-d static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
t&r.Kf9Z\ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
$^Fl*:6 static int KeyCount =0;
@,vmX
z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
DD|0?i #pragma data_seg()
sZ.<:mu[ HINSTANCE hins;
(m~>W"x/ void VerifyWindow();
=
tv70d' BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
D tsZP
( //{{AFX_MSG_MAP(CHookApp)
I= mz^c{ // NOTE - the ClassWizard will add and remove mapping macros here.
XHr*Rs.[= // DO NOT EDIT what you see in these blocks of generated code!
w+M/VsL //}}AFX_MSG_MAP
Wh[QR-7Ew END_MESSAGE_MAP()
[BWq9uE vCzZjGBY CHookApp::CHookApp()
*FS8]!Qg {
KII{GDR] // TODO: add construction code here,
a:kAo0@":j // Place all significant initialization in InitInstance
4ot<Uw5 }
%()d$.F ?|nl93m CHookApp theApp;
7#V7D6j1 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
IpP%WW u {
wwUI ;g BOOL bProcessed=FALSE;
P"YdB|I if(HC_ACTION==nCode)
{15j'Qwm {
^_7|b[Bt if((lParam&0xc0000000)==0xc0000000){// Key up
oV|O`n switch(wParam)
({f}Z-% {
!`69.v case VK_MENU:
9:j?Jvw$ MaskBits&=~ALTBIT;
Z%t_1t break;
6FUW^dt case VK_CONTROL:
YEL0h0gn MaskBits&=~CTRLBIT;
2M
%j-yG" break;
W5*ldXXk case VK_SHIFT:
/x VHd MaskBits&=~SHIFTBIT;
@CprC]X break;
aukcO;oG< default: //judge the key and send message
LUOjaX break;
JGs:RD' }
j-<]OOD for(int index=0;index<MAX_KEY;index++){
ER0
Yl if(hCallWnd[index]==NULL)
du65=w4E! continue;
"J VIkC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m%'nk"p9 {
L9GLjRp- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qBA)5Sv\V bProcessed=TRUE;
GkGiQf4hh }
F%OP,>zl }
z7K{ ,y }
Q$%apL else if((lParam&0xc000ffff)==1){ //Key down
(q)}`1d' switch(wParam)
7]=&Q4e4 {
6h 0qtXn- case VK_MENU:
_`$Q6!Z)l MaskBits|=ALTBIT;
4TtC~#D: break;
3I)~;>meo case VK_CONTROL:
(gt\R} MaskBits|=CTRLBIT;
Fmk:[hMw break;
'aSsyD!?< case VK_SHIFT:
[xS7ae MaskBits|=SHIFTBIT;
u3T-U_:jSV break;
mm/\\my default: //judge the key and send message
7?P'f3)fG break;
dwO fEYC }
RS5<] dy for(int index=0;index<MAX_KEY;index++)
f:o.[4p2 {
~_ THvx1 if(hCallWnd[index]==NULL)
"LBMpgpU continue;
0~|0D#klB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(i
"TF2U,< {
fSo8O SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
19 5_1?'< bProcessed=TRUE;
v%tjZ5x }
<Q[%:LD }
Cbbdq%ySI }
~i,d%a if(!bProcessed){
(tK_(gO for(int index=0;index<MAX_KEY;index++){
sh/,"b2!P if(hCallWnd[index]==NULL)
|G j.E continue;
K#3^GB3P if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7 N}@zPAZ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
7Cz~nin>7 }
HqGI. }
-[mmT'sS }
+a,SP
return CallNextHookEx( hHook, nCode, wParam, lParam );
)gpN
5TDd }
Gu;40)gm b
74!Zw BOOL InitHotkey()
LjKxznn o {
U[]yN.J if(hHook!=NULL){
0s n$QmW: nHookCount++;
NdK`-RT return TRUE;
pb!2G/,.[ }
:~-: else
~OD6K`s3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
X3:1KDVsV if(hHook!=NULL)
}7PJr/IuF nHookCount++;
;,y_^-h; return (hHook!=NULL);
1+%UZK= K }
D*l(p5[ BOOL UnInit()
fB2ILRc {
FZ*"^=)`G if(nHookCount>1){
" ityx? nHookCount--;
CD1Ma8I8 return TRUE;
SKG
U)Rn; }
pY&6p~\p BOOL unhooked = UnhookWindowsHookEx(hHook);
g=:o 'W$@ if(unhooked==TRUE){
#2=l\y-# nHookCount=0;
qq)5)S hHook=NULL;
-Jv,#Z3 }
[R]V4Hb return unhooked;
~d*Q{v~3 }
}Qo]~/ vJE=H9E BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*|&Y ,H? {
g *5_m(H BOOL bAdded=FALSE;
g[cnaS|? for(int index=0;index<MAX_KEY;index++){
u#6s^
)W if(hCallWnd[index]==0){
[s}W47N1 hCallWnd[index]=hWnd;
wgz]R HotKey[index]=cKey;
*q}yfa35eR HotKeyMask[index]=cMask;
ydWr&E5 bAdded=TRUE;
GRc)3
2, KeyCount++;
GMU!GSY break;
\`.v8C>vG }
&r,vD, }
Zma;An6 return bAdded;
C(>!?-. }
[8u9q.IZ f2.=1)u. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2Z; !N37U {
XX=OyDLqP BOOL bRemoved=FALSE;
2)EqqX[D for(int index=0;index<MAX_KEY;index++){
:7{GOx if(hCallWnd[index]==hWnd){
|5>Tf6$( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
g?
vz\_ hCallWnd[index]=NULL;
jV%
VN HotKey[index]=0;
;CO qu#( HotKeyMask[index]=0;
F=\
REq bRemoved=TRUE;
r1~W(r.x KeyCount--;
`.@udfog^0 break;
G}U <^]c }
uQG|r)
}
EH".ki=e }
r'noB<|e return bRemoved;
%
J\G[dl }
W@!qp UVDMYA0 void VerifyWindow()
+ 149 o2 {
7\@c1e*e
for(int i=0;i<MAX_KEY;i++){
IlJ"t`Z9) if(hCallWnd
!=NULL){ :1d;jx>
if(!IsWindow(hCallWnd)){ <gPM/4$G
hCallWnd=NULL; >4g!ic~O
HotKey=0; \7\sx:!$
HotKeyMask=0; c{^1`(#?
KeyCount--; =t N}4
} S6bW
r0XR
} rL<N:@HL
} <ppdy,j:
} ,RV>F_
BMq> Cj+
BOOL CHookApp::InitInstance() "yymnIQ3u
{ Q 1i5"'][
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?C CQm
hins=AfxGetInstanceHandle(); cO:lpsKYQ
InitHotkey(); =LGM[Z3$s
return CWinApp::InitInstance(); "9s}1C; Me
} ,wf_o%'eW
x,: k/]
int CHookApp::ExitInstance() JbEEI(Q>g
{ c,#=In2
VerifyWindow(); eNfH9l2k
UnInit(); 5H'Iul<Os
return CWinApp::ExitInstance(); ,b^Y8_ltoT
} 5]mH.{$x$?
e@c8Ce|0
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $c*fbBM(&n
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^5Y<evjm
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7(5d$ W
#if _MSC_VER > 1000 ]prw=rD
#pragma once E2l"e?AN~
#endif // _MSC_VER > 1000 h~QQ-
y%|E z
class CCaptureDlg : public CDialog aP (~l_
{ >0 7i"a
// Construction !UT!PX)
public: ju:}%'
BOOL bTray;
/1TK+E$
BOOL bRegistered; Dj= {%
BOOL RegisterHotkey(); :xg
J2
UCHAR cKey; ;\"5)S
UCHAR cMask; DK2Wjr;
void DeleteIcon(); .|"E:qTD
void AddIcon(); ,&Zp^
UINT nCount; =ZSYg K
void SaveBmp(); .NWsr*Tel
CCaptureDlg(CWnd* pParent = NULL); // standard constructor `]]m$
// Dialog Data T6SYXQd>.
//{{AFX_DATA(CCaptureDlg) ?i_2ueVR
enum { IDD = IDD_CAPTURE_DIALOG }; #++:`Z
CComboBox m_Key; ;+DMv5A "
BOOL m_bControl; u;%~P 9O
BOOL m_bAlt; 0rX%z$D+@
BOOL m_bShift; ;7[DFlS\P
CString m_Path; 4]}d'x&
CString m_Number; yC@PMyE]
//}}AFX_DATA
H.hKh
// ClassWizard generated virtual function overrides "#36-
//{{AFX_VIRTUAL(CCaptureDlg) 4iSN.nxIZ
public: l_((3e[)
virtual BOOL PreTranslateMessage(MSG* pMsg); Vh01y f
protected: W rT_7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support alxIc.[
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '"q+[zwv
//}}AFX_VIRTUAL f:nXE&X[
// Implementation UQ hD8Z'I.
protected: b4$g$()
HICON m_hIcon; 1A93ol=
// Generated message map functions aeYz;&K
//{{AFX_MSG(CCaptureDlg) 2./z6jXW_
virtual BOOL OnInitDialog(); EWl9rF@I
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ">B&dNrt
afx_msg void OnPaint(); s o: o
b}
afx_msg HCURSOR OnQueryDragIcon(); O*2{V]Y
@
virtual void OnCancel(); +-x+c:
IxA
afx_msg void OnAbout(); /_JR7BB^X,
afx_msg void OnBrowse(); jn]l!nm
afx_msg void OnChange(); }ub>4N[
//}}AFX_MSG U e-AF#
DECLARE_MESSAGE_MAP() FYNUap,A
}; @Nm{H
#endif z$Z%us>io
LvGo$f/9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file R
{-M%n4w
#include "stdafx.h" K7$Q.
#include "Capture.h" p]e.E`'S
#include "CaptureDlg.h" * W"Pv,:
#include <windowsx.h> xhCNiYJ|
#pragma comment(lib,"hook.lib") qU&v50n
#ifdef _DEBUG 3]\'Q}
#define new DEBUG_NEW J>hjIN
#undef THIS_FILE E-X02A
static char THIS_FILE[] = __FILE__; @CPkP
#endif :3se/4y}
#define IDM_SHELL WM_USER+1 'D[ *|Qcy
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XThU+s9
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?!tO'}?
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *Qngx
class CAboutDlg : public CDialog %YuFw|wO
{ 0m4#{^Y
public: [ P*L`F
CAboutDlg(); ee<'j~{A
// Dialog Data ?<OE|nb&
//{{AFX_DATA(CAboutDlg) ](+u'8
enum { IDD = IDD_ABOUTBOX }; lBG5~<NT
//}}AFX_DATA ,S}wOjb@
// ClassWizard generated virtual function overrides u#ocx[
//{{AFX_VIRTUAL(CAboutDlg) '*U_!RmQ
protected: (e
2.Ru
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rXrIGgeM
//}}AFX_VIRTUAL .dc|?$XV
// Implementation hZ>1n&[@
protected: M6[O>z
//{{AFX_MSG(CAboutDlg) j<?k$8H
//}}AFX_MSG 3E @ &
DECLARE_MESSAGE_MAP() bHDZ=Ik
}; ZSwhI@|
25vq#sS]
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m9 'bDyyK
{ ^MWp{E
//{{AFX_DATA_INIT(CAboutDlg) *P12d
//}}AFX_DATA_INIT rv~OfL
} I'J-)D`
nS!m1&DeD
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >)`*:_{
{ KrTlzbw&p\
CDialog::DoDataExchange(pDX); vQ5rhRG)E
//{{AFX_DATA_MAP(CAboutDlg) e{Mkwi+j
//}}AFX_DATA_MAP 5 yL"=3&+
} t,5AoK/NL9
!4"$O@U4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) efyGjfoO
//{{AFX_MSG_MAP(CAboutDlg) V' sq'XB
// No message handlers SphP@J<ONW
//}}AFX_MSG_MAP w\JTMS$
END_MESSAGE_MAP() &61h*s
-9 |)O:
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4?`*#DPl
: CDialog(CCaptureDlg::IDD, pParent) :K*/
{ ;A?86o'?
//{{AFX_DATA_INIT(CCaptureDlg) [Z[ p@Ux
m_bControl = FALSE; oC TSV
m_bAlt = FALSE; LD;!
s
m_bShift = FALSE; 7U)w\A;~
m_Path = _T("c:\\"); g s%[Cv
m_Number = _T("0 picture captured."); %pxHGO=)E
nCount=0; %8KbVjn
bRegistered=FALSE; cS",Bw\
bTray=FALSE; s8*Q@0
//}}AFX_DATA_INIT aO
*][;0
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7$kTeKiP
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'V4B{n7h
} qwuA[QkPi
No'Th7=|S
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) K pKZiUQm
{ 1?y
QjW,
CDialog::DoDataExchange(pDX); AHplvksb
//{{AFX_DATA_MAP(CCaptureDlg) e1H2w?
s
DDX_Control(pDX, IDC_KEY, m_Key); |Mnc0Fgvy,
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8$ _8Yva"e
DDX_Check(pDX, IDC_ALT, m_bAlt); _.GHtu/I
DDX_Check(pDX, IDC_SHIFT, m_bShift); 0[-@<w ^j
DDX_Text(pDX, IDC_PATH, m_Path); `9DW}
DDX_Text(pDX, IDC_NUMBER, m_Number); cw;TIx_q
//}}AFX_DATA_MAP \`?4PQ
} )5<c8lzp
IP#qT
`=}
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <[z9*Tm
//{{AFX_MSG_MAP(CCaptureDlg) 6 Znt
ON_WM_SYSCOMMAND()
{u$<-W-&
ON_WM_PAINT() l Ztw[c
ON_WM_QUERYDRAGICON() #@cEJV;5"
ON_BN_CLICKED(ID_ABOUT, OnAbout) zE=^}K+
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) h(FFG%H(
ON_BN_CLICKED(ID_CHANGE, OnChange) *5" )3\/
//}}AFX_MSG_MAP j-/F*P
END_MESSAGE_MAP() YZc{\~d
1{CVd m<9
BOOL CCaptureDlg::OnInitDialog() $btk48a 7
{ P\2x9T
CDialog::OnInitDialog(); N}\3UHtO
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U1pwk[
ASSERT(IDM_ABOUTBOX < 0xF000); pE]s>Ta
CMenu* pSysMenu = GetSystemMenu(FALSE); (+9^)No
if (pSysMenu != NULL) o[k,{`M0
{ Uclta
CString strAboutMenu; KCS},X_
strAboutMenu.LoadString(IDS_ABOUTBOX); NY%=6><t!
if (!strAboutMenu.IsEmpty()) u:}yE^8 @
{ p~<d8n4UH
pSysMenu->AppendMenu(MF_SEPARATOR); O<+x=>_
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y-P?t+l
} xU;Q~(
} 5J*h7
SetIcon(m_hIcon, TRUE); // Set big icon A~wVY
SetIcon(m_hIcon, FALSE); // Set small icon $$---Y
m_Key.SetCurSel(0); :w26d-QR(
RegisterHotkey(); 3W@ta1
CMenu* pMenu=GetSystemMenu(FALSE); ?_@Mg\Hc
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);
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pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .10$n*
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6hf6Z3
return TRUE; // return TRUE unless you set the focus to a control TE@bV9a
} fsV_>5I6
*|.-y->
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) a(K^/BT
{ ]= 9^wS
if ((nID & 0xFFF0) == IDM_ABOUTBOX) oedLe9!
{ e`t-:~'
CAboutDlg dlgAbout; KqWt4{\8v`
dlgAbout.DoModal(); w4;1 ('
} `>\>'V<&
else Kfs|KIQ>=
{ VuA)Ye
CDialog::OnSysCommand(nID, lParam); f>ilk Q`
} 9Z. WR-}
} K7]+. f
*l8:%t\
void CCaptureDlg::OnPaint() t|cTl/i
4
{ u\ }"l2 r
if (IsIconic()) %8! }" Xa
{ ~d&W;mef-
CPaintDC dc(this); // device context for painting ]t.6bb4
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cp3O$S
// Center icon in client rectangle Aw7_diK^
int cxIcon = GetSystemMetrics(SM_CXICON); u*<knZ~ty
int cyIcon = GetSystemMetrics(SM_CYICON); J+f*D+x1
CRect rect; G>j4b}e
GetClientRect(&rect); )\l(h%s[I
int x = (rect.Width() - cxIcon + 1) / 2; -i"?2gK
int y = (rect.Height() - cyIcon + 1) / 2; f
_*F&-L
// Draw the icon kPFqsq
dc.DrawIcon(x, y, m_hIcon); 1zJ)x?
} P~ODd(
else S2"H E`
{ vUgMfy&
CDialog::OnPaint(); J4q_}^/2w
} |eFce/
} 0I"r*;9?K
Cc>+OUL
HCURSOR CCaptureDlg::OnQueryDragIcon() 4xzoA'Mb@
{ &265
B_'D
return (HCURSOR) m_hIcon; N Uo
} SR*KZ1U
vjO@"2YEw
void CCaptureDlg::OnCancel() 5YnTGf&
{ Ce!xa\
if(bTray) '(yjq<
DeleteIcon(); 05/'qf7P,U
CDialog::OnCancel(); E@92hB4D"
} :6y;U
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void CCaptureDlg::OnAbout() I?Ct@yxhF'
{ "/qm,$
CAboutDlg dlg; TAKvE=a;
dlg.DoModal(); hScC<=W
} .{
r
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@_C?M5v
void CCaptureDlg::OnBrowse() p2uZ*sY(D
{ oTLpq:9J
CString str; y-#01Z
BROWSEINFO bi; 5BB:.
char name[MAX_PATH]; b]xE^zM-I`
ZeroMemory(&bi,sizeof(BROWSEINFO)); /zZ";4
bi.hwndOwner=GetSafeHwnd(); y#)ad\
bi.pszDisplayName=name; ?S~j2 J]
bi.lpszTitle="Select folder"; kr>H,%3~
bi.ulFlags=BIF_RETURNONLYFSDIRS; pF}WMt
LPITEMIDLIST idl=SHBrowseForFolder(&bi); zJX _EO
if(idl==NULL) Zsx\GeE%:
return; KkD&|&!Q7u
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VJ()sbl{k
str.ReleaseBuffer(); &BS*C} },
m_Path=str; rM{V>s:N
if(str.GetAt(str.GetLength()-1)!='\\') *_CzCl^
m_Path+="\\"; xJ|_R,>.H
UpdateData(FALSE); ?'+kZ|
} .Arcsg
xdkC>o4>
void CCaptureDlg::SaveBmp() u#~q86k
{ K *xca(6
CDC dc; ,7mB`0j>
dc.CreateDC("DISPLAY",NULL,NULL,NULL); \9`76*X6
c
CBitmap bm; V"DilV$v
int Width=GetSystemMetrics(SM_CXSCREEN); 0m
7_#g4$L
int Height=GetSystemMetrics(SM_CYSCREEN); Va3/#is'
bm.CreateCompatibleBitmap(&dc,Width,Height); 8a,pDE
CDC tdc; b,):&M~p
tdc.CreateCompatibleDC(&dc); IJ#+"(?7,u
CBitmap*pOld=tdc.SelectObject(&bm); Auk#pO#
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); d@e2+3<
tdc.SelectObject(pOld); 5!*@gn
BITMAP btm; Z[?zaQ$
bm.GetBitmap(&btm); c%vtg.A
DWORD size=btm.bmWidthBytes*btm.bmHeight; n,8bQP=&
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); XAw0Nn
BITMAPINFOHEADER bih; xmNs<mz
bih.biBitCount=btm.bmBitsPixel; e]q(fPK
bih.biClrImportant=0; 8m"jd+
bih.biClrUsed=0; 9A!B|s
bih.biCompression=0; F0]xc
bih.biHeight=btm.bmHeight; LMTz/M
bih.biPlanes=1; uwo\FI
bih.biSize=sizeof(BITMAPINFOHEADER); d_aHUmI^"
bih.biSizeImage=size; $s"{C"4q
bih.biWidth=btm.bmWidth; } za"rU
bih.biXPelsPerMeter=0; c=#V*<
bih.biYPelsPerMeter=0; :oO
?A
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "1|\V.>>;
static int filecount=0; iTIYq0u|#R
CString name; E2u9>m4_J
name.Format("pict%04d.bmp",filecount++); 1yV+~)by3
name=m_Path+name; EUjA-L(
BITMAPFILEHEADER bfh; jSd[
bfh.bfReserved1=bfh.bfReserved2=0; E)z=85;_p
bfh.bfType=((WORD)('M'<< 8)|'B'); TAp8x
bfh.bfSize=54+size; ]mT2a8`c.r
bfh.bfOffBits=54; \_l4li
CFile bf; dBNx2T}_0
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L5 Q^cY]p
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jHQnD]Hr
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j`:D BO&)\
bf.WriteHuge(lpData,size); %=`wN^3t2
bf.Close(); Eu|O<9U\
nCount++; r2G38/K
} Df5!z \dx
GlobalFreePtr(lpData); =>htX(k}
if(nCount==1) %:e.ES
m_Number.Format("%d picture captured.",nCount); nN5fP<H2x
else o9]i
{e>L
m_Number.Format("%d pictures captured.",nCount); "< })X.t
UpdateData(FALSE); 8T?D#,/
} CWa~~h<r-
B!1Bg9D
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) NE4 }!I
{ pj#l s
if(pMsg -> message == WM_KEYDOWN) Z~1uyr(
{ uZe"M(3r$
if(pMsg -> wParam == VK_ESCAPE) d3"QCl
return TRUE; E4,
J"T|@
if(pMsg -> wParam == VK_RETURN) M2pFXU?]
return TRUE; Nk;ywC"e;
} L%;[tu(*
return CDialog::PreTranslateMessage(pMsg); ;LqpX!Pi
f
} mnL+@mm
3nnoXc'
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s`gfz}/
{ <rxtdI"3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2;ju/9x
SaveBmp(); i|[**P
return FALSE; YF)k0bu&;
} }inV)QQ
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C`qE ,2.
CMenu pop; lKG' KR.
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y}1Pc*
CMenu*pMenu=pop.GetSubMenu(0); 7#(0GZN9h%
pMenu->SetDefaultItem(ID_EXITICON); se=;vp]3a
CPoint pt; X m3r)Bm'3
GetCursorPos(&pt); (7Ln~J*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pGd@%/]AO
if(id==ID_EXITICON) Zm*q V!
DeleteIcon(); ,ygUy]
else if(id==ID_EXIT) 89Ir}bCr
OnCancel(); :!ablO~
return FALSE; WG*),P?
} A DVUx}
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZvwU
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *vzEfmN:d
AddIcon(); }0,dG4Oo=
return res; N}>[To3
} 2Q 5-.2]
AQwai>eL
void CCaptureDlg::AddIcon() |k^C-
{ 055C1RV%
NOTIFYICONDATA data; $plqk^P
data.cbSize=sizeof(NOTIFYICONDATA); [}!0PN?z~A
CString tip; 6aLRnH"Ud
tip.LoadString(IDS_ICONTIP); ^?NLA&v<
data.hIcon=GetIcon(0); AuT:snCzR
data.hWnd=GetSafeHwnd(); % {-r'Yi%
strcpy(data.szTip,tip); 2"HG6"Rr
data.uCallbackMessage=IDM_SHELL; 5W0s9yD
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0n}v"61q
data.uID=98; (67byO{
Shell_NotifyIcon(NIM_ADD,&data); u+^KP>rM(
ShowWindow(SW_HIDE); f,x;t-o+R
bTray=TRUE; z*B?Hw),
} [*M':
hn~btu9h
void CCaptureDlg::DeleteIcon() #p
;O3E@
{ #\
uB!;Q
NOTIFYICONDATA data; UA|\D]xe
data.cbSize=sizeof(NOTIFYICONDATA); ^a<kp69qS
data.hWnd=GetSafeHwnd(); U\(71=
data.uID=98; +NbiUCMX
Shell_NotifyIcon(NIM_DELETE,&data); `hdN 6PgK
ShowWindow(SW_SHOW); }?o4MiLB
SetForegroundWindow(); '{-Ic?F<P
ShowWindow(SW_SHOWNORMAL); W-*HAS
bTray=FALSE; nxB[To*P
} zz!jt
A
*d`KD64
void CCaptureDlg::OnChange() bp<,Xfl
{ 3"juj'
RegisterHotkey(); NeJ->x,
} W,"Re,`H
u=tp80_
BOOL CCaptureDlg::RegisterHotkey() aIDv~#l
{ zU0SlRFu
UpdateData(); mFeR~Bi>!
UCHAR mask=0; zdw*
?C
UCHAR key=0; wX$|(Y}
if(m_bControl) Zl>dBc%
mask|=4; f >.^7.is
if(m_bAlt) ,"Fl/AjO
mask|=2; Y'5(exW
if(m_bShift) KaX*) P
mask|=1; Paeq
key=Key_Table[m_Key.GetCurSel()]; s/.P/g%tA>
if(bRegistered){ wqi0%Cu*
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Z~<=I }@
bRegistered=FALSE; ~>N63I6
} *AP"[W
cMask=mask; F{.\i *$
cKey=key; mz+UkA'
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fs?H
return bRegistered; )ki
Gk}2
} ^`B;SSV
=H3tkMoi2
四、小结 ^/6P~iK'
I)yF!E &
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。