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:
Lnh=y2
LiG$M{ 0 一、实现方法
` 2W^Ui,4 M =^d 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
XGl2rX& W+ S~__K #pragma data_seg("shareddata")
p) 8S]p] HHOOK hHook =NULL; //钩子句柄
s;VW
%e UINT nHookCount =0; //挂接的程序数目
r2=@1=?8 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
)5}<@Ql static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
V`I4"}M1 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
7}kJp%- static int KeyCount =0;
! ?g+'OM static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
|7|S>h^ #pragma data_seg()
NrqJf-ldo r<vMp'u 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
53i]Q;k [ h:aa^a~yi DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
b@Oq}^a&o gNCS*a BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
=D`8,n [ cKey,UCHAR cMask)
Scrj%h%[ {
xo[o^go BOOL bAdded=FALSE;
.t "VsY| for(int index=0;index<MAX_KEY;index++){
_?~%+Oz/ if(hCallWnd[index]==0){
T8^9*]:@c! hCallWnd[index]=hWnd;
f^F;`;z HotKey[index]=cKey;
V
0Bl6 HotKeyMask[index]=cMask;
&hYgu3O bAdded=TRUE;
|:eTo<
KeyCount++;
<z<>E1ZLI break;
!VGG2N8 }
IoDT }
&QHJ%c return bAdded;
j,0`k }
)~U1sW&t //删除热键
X1@DI_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|}=eY?iXo {
"_WN[jm BOOL bRemoved=FALSE;
#3&@FzD_P for(int index=0;index<MAX_KEY;index++){
=CLPz8 if(hCallWnd[index]==hWnd){
"hk#pQ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
e*:K79y hCallWnd[index]=NULL;
'PF>#X'' HotKey[index]=0;
5u!\c(TJ+ HotKeyMask[index]=0;
f$lb.fy5 bRemoved=TRUE;
0S{23L4C KeyCount--;
-|.NwGh break;
0m_yW$w }
)3h\QE!z }
sYKx3[ V/ }
AQ,lLn+ return bRemoved;
+z;*r8d<X }
_T\ ~% (nqry[g& *ID=X!v DLL中的钩子函数如下:
UoT`/. ]\pi!oa LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
rFXdxRP;M {
_p )NZ7yC BOOL bProcessed=FALSE;
y'2|E+*V if(HC_ACTION==nCode)
AB3_|Tza~& {
~q`!928Gu if((lParam&0xc0000000)==0xc0000000){// 有键松开
[^hW>O=@TN switch(wParam)
xM jn=\} {
@|
z _&E case VK_MENU:
~gI%lORqN MaskBits&=~ALTBIT;
NEq_!!/sF break;
h^3gYL7O6 case VK_CONTROL:
'< Zm>L& MaskBits&=~CTRLBIT;
h:4(Gm; break;
}*:3] case VK_SHIFT:
'/>Mr!H# MaskBits&=~SHIFTBIT;
Wiis<^) break;
+CSpL2@ default: //judge the key and send message
D+7xMT8pqH break;
CS[]T9|_ }
{++EX2 for(int index=0;index<MAX_KEY;index++){
a/J<(sak~X if(hCallWnd[index]==NULL)
;.}L#'0j continue;
+x%u?ZR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&_L@hsm {
KIF9[/P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x9l7|G/$ bProcessed=TRUE;
tYjG8P# }
}_+XN"}C }
Sdq}?- &Sa }
[Sm<X else if((lParam&0xc000ffff)==1){ //有键按下
t'44X switch(wParam)
<6Q^o[L {
a#p+.)Wm case VK_MENU:
>_}isCd, MaskBits|=ALTBIT;
@|Pm%K`1 break;
_(m72o0g>> case VK_CONTROL:
D \ rns+ MaskBits|=CTRLBIT;
|1@O>GG break;
j,YrM?Xdo case VK_SHIFT:
ZLQmEF[> MaskBits|=SHIFTBIT;
!#0)`4O break;
j<^!"_G]*? default: //judge the key and send message
u({^8: AYu break;
.<m]j;|6 }
Zl>SeTjB- for(int index=0;index<MAX_KEY;index++){
^6W}ZLp if(hCallWnd[index]==NULL)
un "I continue;
LK'(OZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H{}&|;0 {
E*'Y xI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
45yP {+/-Q bProcessed=TRUE;
K,S4 }
3fOOT7!FL }
p(yv }
tD8fSV if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
/zIG5RK> for(int index=0;index<MAX_KEY;index++){
2!%)_< if(hCallWnd[index]==NULL)
3bRxV
@0. continue;
Gk:fw#R if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
NM. e4 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
FvsVfV U //lParam的意义可看MSDN中WM_KEYDOWN部分
Ct=bZW"j/ }
VEWW[T }
4%0s p }
O=Su
E/q return CallNextHookEx( hHook, nCode, wParam, lParam );
kQ+y9@=/g }
PZ]tl 5_9`v@-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:
}3z3GU8Q- X'OpR BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
k0Vri$x BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
u$?! A'EI1_3{ 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%4ed# m>uG{4<- LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2s}S9 {
k^7!iOK2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
J&6p/'UPZ {
(;fJXgj. //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Pe:)zt0 SaveBmp();
!8@yi"n return FALSE;
Xqf\}p n }
eU"yF >6' …… //其它处理及默认处理
?+}Su'pv} }
R>c>wYt'f SQ)BS/8A INndTF 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 ^<AUT U5"u
h} 3 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。
"kApGNB KS_+R@3Z 二、编程步骤
z83v
J*. a?gF;AYk 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";
~gX1n9_n uyX
%&r 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?8
}pZ_ j aR2N,<Cp5 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;
x}2nn)fdZ SkDr4kds 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;
b`e_}^,c Jxl'!8t 5、 添加代码,编译运行程序。
D5"5`w=C &[yC M! 三、程序代码
wH"9N+82M 8L[+$g` ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
yu_PZ"l #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
E$%v);u #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
CDJ@Tdp #if _MSC_VER > 1000
rl.K{Uad #pragma once
| V(sCF #endif // _MSC_VER > 1000
Dbn~~P #ifndef __AFXWIN_H__
]I*RuDv} #error include 'stdafx.h' before including this file for PCH
k _t|)
J #endif
aQoB1qd8 #include "resource.h" // main symbols
Q7x[08TI class CHookApp : public CWinApp
{/noYB<; {
fV+a0=Z public:
"'5(UiSFz CHookApp();
=R0f{&"i // Overrides
-#I]/7^ // ClassWizard generated virtual function overrides
GkOk.9Y,5 //{{AFX_VIRTUAL(CHookApp)
Pz50etJ public:
LB@<Q.b,U virtual BOOL InitInstance();
N+.Nu= +i2 virtual int ExitInstance();
cK|Uwzifd //}}AFX_VIRTUAL
7"|Qmyb //{{AFX_MSG(CHookApp)
]O;*Y{:Y // NOTE - the ClassWizard will add and remove member functions here.
Wl3S]4A // DO NOT EDIT what you see in these blocks of generated code !
^S|qGu,G //}}AFX_MSG
\zU<o~gs DECLARE_MESSAGE_MAP()
xR-;,=J };
{)Wf[2zJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
?Nt( sZ- BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
pnu?=.O BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
K2*rqg BOOL InitHotkey();
IWYQ67Yj BOOL UnInit();
fDYTupKXH #endif
]DnAW'm O#.YTTj //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=?|$}vDO[ #include "stdafx.h"
pbKmFweq #include "hook.h"
v,n 8$, #include <windowsx.h>
:G6CWE #ifdef _DEBUG
Fepsa;\sU #define new DEBUG_NEW
W9l](Ow #undef THIS_FILE
;tQc{8O6L static char THIS_FILE[] = __FILE__;
<IWg]AJT: #endif
C6c*y\O\7 #define MAX_KEY 100
r?)1)?JnHe #define CTRLBIT 0x04
6!i`\>I] #define ALTBIT 0x02
#;99vwc #define SHIFTBIT 0x01
gy?uk~p #pragma data_seg("shareddata")
F7'MoH HHOOK hHook =NULL;
$j,$O>V UINT nHookCount =0;
f5//?ek static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
'-myOM7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
6}Y==GPt static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
[!U%'' static int KeyCount =0;
H%vgPQ8 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
6,4vs+(|\ #pragma data_seg()
Wpf~Ji6|| HINSTANCE hins;
I3
6@x`f void VerifyWindow();
HG /fp<[ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
kmW/{I9,ua //{{AFX_MSG_MAP(CHookApp)
6`-<N ! // NOTE - the ClassWizard will add and remove mapping macros here.
Yv=L'0K& // DO NOT EDIT what you see in these blocks of generated code!
:UT\L2 q= //}}AFX_MSG_MAP
U
_pPI$ = END_MESSAGE_MAP()
OfrzmL<K v,opyTwG| CHookApp::CHookApp()
$<nD-4p {
O!>#q4&] // TODO: add construction code here,
xVsI#`<a // Place all significant initialization in InitInstance
h% >ZN-K) }
#Ey_.4S LawE3CD CHookApp theApp;
K!AA4!eUzM LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
h}|.#!C3 {
i~E0p
, BOOL bProcessed=FALSE;
U;kNo3= if(HC_ACTION==nCode)
fhn$~8[_A {
6 _V1s1F if((lParam&0xc0000000)==0xc0000000){// Key up
'hu'}F{ switch(wParam)
CE{2\0Q {
Cn=#oE8(A case VK_MENU:
a`:F07r MaskBits&=~ALTBIT;
xrXfZ>$5bM break;
^PC;fn,I case VK_CONTROL:
cY+fZ= MaskBits&=~CTRLBIT;
x _kT
Wq break;
Z;NaIJiL- case VK_SHIFT:
Eve,*ATI MaskBits&=~SHIFTBIT;
yOD=Vc7i break;
zA?AX1%Wa default: //judge the key and send message
3u t<o- break;
^fN/ }
?*UWg[ for(int index=0;index<MAX_KEY;index++){
R`o
Xkj if(hCallWnd[index]==NULL)
kbvF
9# continue;
-+i7T^@| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-p0*R<t {
c0l?+:0M SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
16N| bProcessed=TRUE;
7}NvO"u }
S@[NKY }
>mtwXmI }
uEhPO else if((lParam&0xc000ffff)==1){ //Key down
F <iV;+ switch(wParam)
ajG_t {
!yi*Zt~ case VK_MENU:
Ve9)?=! MaskBits|=ALTBIT;
%<8?$-[ break;
mYfHBW: case VK_CONTROL:
OW6dK#CFt MaskBits|=CTRLBIT;
~233{vh$=> break;
Bx)!I]gi_ case VK_SHIFT:
;y7+ Q MaskBits|=SHIFTBIT;
J@i9)D_ break;
"PS ) "t default: //judge the key and send message
5{ !"} break;
YHY*dk*|C }
yzl}!& E for(int index=0;index<MAX_KEY;index++)
)b%zYD9p {
QxbG-B^)= if(hCallWnd[index]==NULL)
x8c>2w;6x^ continue;
PYNY1|3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vo:h"ti {
*6][[)( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<Vt"%C bProcessed=TRUE;
Myn51pczl }
F(/Ka@
}
X]2x0 }
,*9gy$ if(!bProcessed){
zgGJ<=G. for(int index=0;index<MAX_KEY;index++){
YADXXQ" if(hCallWnd[index]==NULL)
xEq? [M continue;
O` !XW8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ml)\R L SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#N|JC d_ }
,y-!h@( }
?
47"$=G }
'
Qlj"U return CallNextHookEx( hHook, nCode, wParam, lParam );
f6\4,() }
'ahZ*@kr `H9+]TWj< BOOL InitHotkey()
hW~UJ/$ {
<eS+3, if(hHook!=NULL){
OXl0R{4 nHookCount++;
MOytxl:R return TRUE;
^R
:zma }
"E4CQL'U else
T#:b hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
~PAI0+*"q if(hHook!=NULL)
a-nn[j nHookCount++;
XL; WU8> return (hHook!=NULL);
!,Cbb } }
"
o3Hd BOOL UnInit()
* RX^ z6 {
8df| 9E$ if(nHookCount>1){
]
M#LB&Pe nHookCount--;
kaoiSL<[6 return TRUE;
*5XOYb?'v. }
xDPR^xY BOOL unhooked = UnhookWindowsHookEx(hHook);
?|Z~mE if(unhooked==TRUE){
l+wfP76w nHookCount=0;
0N]\f.=` hHook=NULL;
GjN6Af~} }
92C; a5s return unhooked;
7hLh} }
>o3R~ [ 4MzPm~Ct BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}}rp/16 {
j0Cj&x%qF} BOOL bAdded=FALSE;
O0_RW`69 for(int index=0;index<MAX_KEY;index++){
Ek_<2!%X if(hCallWnd[index]==0){
'-X O;{,-R hCallWnd[index]=hWnd;
+!:=Mm HotKey[index]=cKey;
UKTfLh HotKeyMask[index]=cMask;
%2B1E( r%M bAdded=TRUE;
/2*BdE[yG KeyCount++;
|TQ4:P1T break;
=\MAz[IDj }
mQSn*;9\T3 }
)%kiM<}) return bAdded;
d0Ubt }
M} ri>o d.Ccc/1- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Wi,)a{ {
G^.tAO5:f BOOL bRemoved=FALSE;
>lyE@S sA for(int index=0;index<MAX_KEY;index++){
0r i if(hCallWnd[index]==hWnd){
8<ev5af if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
SXE@\Afj hCallWnd[index]=NULL;
8X278^
# HotKey[index]=0;
~4twI*f HotKeyMask[index]=0;
C9""sVs bRemoved=TRUE;
v046 KeyCount--;
-0]%#(E%`h break;
9KJ}Ai }
62Tel4u }
xpu2RE }
f<|*^+ return bRemoved;
3zc;_U2 }
Jt<J#M<}7 5')]Y1J void VerifyWindow()
xsy45az<ip {
IDpx_ for(int i=0;i<MAX_KEY;i++){
Bga4kjfmk if(hCallWnd
!=NULL){ .wlKl[lE2
if(!IsWindow(hCallWnd)){ f87XE";:A
hCallWnd=NULL; s%>8y\MaK
HotKey=0;
{gD`yoPrV
HotKeyMask=0; q"S,<I<f
KeyCount--; lF40n4}
} 9`"#OQPn1
} F~7TE91C
} 5DkEJk7a
} "3a}~J<g
V,8Z!.MG
BOOL CHookApp::InitInstance() :>_oOn[ _
{ [7LdTY"Tl
AFX_MANAGE_STATE(AfxGetStaticModuleState()); D,lY_6=
hins=AfxGetInstanceHandle(); 0V^I.S/q
InitHotkey(); tTubW=H
return CWinApp::InitInstance(); CBpwtI>p
} iE_[]Vgc
%XZhSmlf
int CHookApp::ExitInstance() _ yDDPuAi
{ f|F=)tJO
VerifyWindow(); JY;u<xl
UnInit(); % -+7=x
return CWinApp::ExitInstance(); 3)2{c
} wf\7sz
p&)d]oV>
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :V@)A/}uk
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /EegP@[
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ S;D]ym
#if _MSC_VER > 1000 TiG?r$6v%
#pragma once fgC@(dvfk
#endif // _MSC_VER > 1000 :qj;f];|
QP%Hwt]+
class CCaptureDlg : public CDialog sX*L[3!vN
{ EwuRIe;D
// Construction /& c2y=/'C
public: $<&_9T#&w
BOOL bTray; BSJS4+,E
BOOL bRegistered; ^SsnCn-e
BOOL RegisterHotkey(); x
ju*zmu
UCHAR cKey; gX(Xj@=(&
UCHAR cMask; 0M&~;`W}
void DeleteIcon(); n6M #Xc'JA
void AddIcon();
s_+.xIZ
UINT nCount; F;kKn:X L
void SaveBmp(); )`ixT)
CCaptureDlg(CWnd* pParent = NULL); // standard constructor C@zG(?X
// Dialog Data N^PkSf[)h5
//{{AFX_DATA(CCaptureDlg) ,S<) )
enum { IDD = IDD_CAPTURE_DIALOG }; s16, *;Z
CComboBox m_Key; H8HVmfM
BOOL m_bControl; ?UOaqcL
BOOL m_bAlt; {cO8q
}L
BOOL m_bShift; ~Eb:AC5
CString m_Path; v<<ATs%w
CString m_Number; _g( aO70Zu
//}}AFX_DATA njO~^Hl7
// ClassWizard generated virtual function overrides G!G:YVWXP
//{{AFX_VIRTUAL(CCaptureDlg) :2/jI:L~
public: .}Ys+d1b9c
virtual BOOL PreTranslateMessage(MSG* pMsg); E`hR(UL
?
protected: H Vhd#Q;
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UugR
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K=}Eupn=
//}}AFX_VIRTUAL v&d'ABeT
// Implementation w:iMrQeJg
protected: r ?<kWR?w
HICON m_hIcon; Gr)G-zE
// Generated message map functions 'jO8C2Th%
//{{AFX_MSG(CCaptureDlg) l]Xbd{
virtual BOOL OnInitDialog(); B4* y-Q.*
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~Z*7:bPN!^
afx_msg void OnPaint(); u2`j\
Vu
afx_msg HCURSOR OnQueryDragIcon(); x*=m'IM[
virtual void OnCancel(); @uN+]e+3
afx_msg void OnAbout(); >H5t,FfQL
afx_msg void OnBrowse(); oOAkwc%)b
afx_msg void OnChange(); a\oz-`ESa
//}}AFX_MSG |!7leL
DECLARE_MESSAGE_MAP() =1(7T.t
}; ) j&khHD
#endif `L[q`r7
Am*lx
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .O(9\3q\
#include "stdafx.h" 1LhZmv
#include "Capture.h" h(J$-SUs
#include "CaptureDlg.h" C&%NO;Ole
#include <windowsx.h> gyV`]uqG
#pragma comment(lib,"hook.lib") 9^`cVjD5
#ifdef _DEBUG &,:!gYN
#define new DEBUG_NEW zxD=q5in
#undef THIS_FILE [Ob'E!;<
static char THIS_FILE[] = __FILE__; L+T7Ge
q
#endif +RR6gAma}<
#define IDM_SHELL WM_USER+1 :RJo#ape
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j6$@vA)
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BA@M>j6d
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *:"60fkoU
class CAboutDlg : public CDialog e8oAGh"
{ f&$;iE
public: f#m@eb
CAboutDlg(); 4,h)<(d{
// Dialog Data @,;h!vB*=
//{{AFX_DATA(CAboutDlg) m|x_++3
enum { IDD = IDD_ABOUTBOX }; :hW(2=%
//}}AFX_DATA tX@y ]"
// ClassWizard generated virtual function overrides _T~&kwe
//{{AFX_VIRTUAL(CAboutDlg) VAUd^6Xdwx
protected:
"^ BA5
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m_Z(osoE#W
//}}AFX_VIRTUAL h&v].l
// Implementation 2_o\Wor#
protected: 9) $[W
//{{AFX_MSG(CAboutDlg) U:eX^LE7
//}}AFX_MSG I.|b:c
xN
DECLARE_MESSAGE_MAP() ;L#RFdh
}; B]}gfVO
a}|<*!4zUQ
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gzH;`,
{ FwHqID_!:l
//{{AFX_DATA_INIT(CAboutDlg) 0T#z"l<L
//}}AFX_DATA_INIT ,_w}\'?L
} *P]]7DR
.d$Q5Qae
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^`aw5 +S
{ \ Ucv<S
CDialog::DoDataExchange(pDX); cXf/
//{{AFX_DATA_MAP(CAboutDlg) \-{$IC-L
//}}AFX_DATA_MAP 7bRfkKD
} nhC8Tq[m
f<nK;
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =3SJl1w1
//{{AFX_MSG_MAP(CAboutDlg) HkhZB^_V
// No message handlers LjW32>B
//}}AFX_MSG_MAP +|8.ymvm
END_MESSAGE_MAP() p1i}fGS
cC|
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V*(x@pF
: CDialog(CCaptureDlg::IDD, pParent) *)I^+zN
{ >+.GBf<E
//{{AFX_DATA_INIT(CCaptureDlg) Uam%u
m_bControl = FALSE; 3PL0bejaT7
m_bAlt = FALSE; }lhk;#r
m_bShift = FALSE; >=:mtcph
m_Path = _T("c:\\"); M6qNh`+HO
m_Number = _T("0 picture captured."); gi5X,:[
nCount=0; +F-Y^):
bRegistered=FALSE; ^-mW k?>
bTray=FALSE; ?[>Y@we
//}}AFX_DATA_INIT -'d`(G"
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #2:?N8vz*
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Lp@Al#X55
} !TY0;is
*b0z/6
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z
j#<X
{ ]GCw3r(!
CDialog::DoDataExchange(pDX); 1|ddG010
//{{AFX_DATA_MAP(CCaptureDlg) ot!m=s
DDX_Control(pDX, IDC_KEY, m_Key); &(Hw:W9
DDX_Check(pDX, IDC_CONTROL, m_bControl); /-^J0f+l3
DDX_Check(pDX, IDC_ALT, m_bAlt); @(E6P;+{
DDX_Check(pDX, IDC_SHIFT, m_bShift); &2 *
DDX_Text(pDX, IDC_PATH, m_Path); KHC Fz
DDX_Text(pDX, IDC_NUMBER, m_Number); AW|SD
//}}AFX_DATA_MAP "iX\U'`
} 4MW oGV9
m?Cb^WgcF
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Oj_F1.
r
//{{AFX_MSG_MAP(CCaptureDlg) DrAIQ7Jd
ON_WM_SYSCOMMAND() a j
.7t=^
ON_WM_PAINT() )1@%!fr
ON_WM_QUERYDRAGICON() O\Z!7UQ$
ON_BN_CLICKED(ID_ABOUT, OnAbout) L>E{~yh
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eLXL5&}`fh
ON_BN_CLICKED(ID_CHANGE, OnChange) oTXIs4+G
//}}AFX_MSG_MAP n<> ^cD
END_MESSAGE_MAP() #DJZ42
T<Qa`|5>
BOOL CCaptureDlg::OnInitDialog() v''J@ F7
{ {YrA[9
CDialog::OnInitDialog(); c'Ibgfx%m
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H]wP\m)
ASSERT(IDM_ABOUTBOX < 0xF000); T3SFG]H
CMenu* pSysMenu = GetSystemMenu(FALSE); K]M@t=
if (pSysMenu != NULL) /?XI,#j3kM
{ \Zx&J.D
CString strAboutMenu; L2}<2
strAboutMenu.LoadString(IDS_ABOUTBOX); 7 H:y=?X6
if (!strAboutMenu.IsEmpty()) F]>+pU
{ u(f;4`
pSysMenu->AppendMenu(MF_SEPARATOR); +|pYu<OY
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gae=+@z
} rLmc(-q
} ~!7x45(1#
SetIcon(m_hIcon, TRUE); // Set big icon ]>k8v6*=
SetIcon(m_hIcon, FALSE); // Set small icon ycOnPTh
m_Key.SetCurSel(0); ~dLbhjden
RegisterHotkey(); '|5o(6u'
CMenu* pMenu=GetSystemMenu(FALSE); y x#ub-A8
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); r%X
M`;bQX
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); W7_m,{q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); VnB HQ.C
return TRUE; // return TRUE unless you set the focus to a control ;XjXv'
} B^GMncZO
~Jw84U{$
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Lw(tO0b2H
{ <}8G1<QZ'.
if ((nID & 0xFFF0) == IDM_ABOUTBOX) \{~CO{II
{ u#^l9/tl
CAboutDlg dlgAbout; iPWr-
dlgAbout.DoModal(); w{*V8S3h9
} @o'L! 5Y
else 83'+q((<
{ cwtlOg
CDialog::OnSysCommand(nID, lParam); (0`w.n
} B|$o.$5
} kdV9F
1x\k:2U
void CCaptureDlg::OnPaint() -J#RGB{7
{ -m>3@"q
if (IsIconic()) R-OO1~W=
{ 8d Fqwpw8
CPaintDC dc(this); // device context for painting Yhm veV
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WDV=]D/OE
// Center icon in client rectangle 6d/v%-3
int cxIcon = GetSystemMetrics(SM_CXICON); gVh&c4
int cyIcon = GetSystemMetrics(SM_CYICON); xWK/uE (
CRect rect;
kz6fU\U
GetClientRect(&rect); 5ZH3}B^L$
int x = (rect.Width() - cxIcon + 1) / 2; {^uiu^RAc
int y = (rect.Height() - cyIcon + 1) / 2; 34k>O
// Draw the icon $9r4MMs{$
dc.DrawIcon(x, y, m_hIcon); Yl"CIgt
} (aSuxl.Dq
else zF{~Md1
{ $Zw+"AA
CDialog::OnPaint(); WwtVuc|
} wpi$-i`
} P6ktA-Hv>
LayK&RwL
HCURSOR CCaptureDlg::OnQueryDragIcon() 4(oU88z
{ ;~d$OM
return (HCURSOR) m_hIcon; >#l:]T
}
-%%Xx5D
Sj|tR[SAoD
void CCaptureDlg::OnCancel() EEK!'[<,sE
{ pYr+n9)^
if(bTray) zks7wt]A
DeleteIcon(); LYd:S
CDialog::OnCancel(); oqhJ2
} xJU]py~o
Q^3{L\6_
void CCaptureDlg::OnAbout() S&XlMu
{ +S-60EN*A
CAboutDlg dlg; :&'jh/vRN
dlg.DoModal(); 7ZyP
} r7R.dD/.
=_m3~=Z
void CCaptureDlg::OnBrowse() }BL7P-km
{ cZ)mp`^n7
CString str; &nI>`Q'
BROWSEINFO bi; Qo^(r$BD
char name[MAX_PATH]; I_Gz~ qk6
ZeroMemory(&bi,sizeof(BROWSEINFO)); !~R<Il|B
bi.hwndOwner=GetSafeHwnd(); !.t D.(XP
bi.pszDisplayName=name; 74:~F)BP
bi.lpszTitle="Select folder"; rKFnivGT
bi.ulFlags=BIF_RETURNONLYFSDIRS; $M!iQ"bb
LPITEMIDLIST idl=SHBrowseForFolder(&bi); w4}Q6_0v
if(idl==NULL) K{`R`SXD
return; lA1
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); P6La)U`VA
str.ReleaseBuffer(); xfI0P0+
m_Path=str; i4h`jFS
if(str.GetAt(str.GetLength()-1)!='\\') 9%NobT
m_Path+="\\"; IvY3iRq6
UpdateData(FALSE); ^E8qI8s
} -mh"["L"
]$9y7Bhj.
void CCaptureDlg::SaveBmp() Ml{
]{n
{ ?nbu`K6T
CDC dc; EQd<!)HZ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1ywdcg
CBitmap bm; 19y,O0# _
int Width=GetSystemMetrics(SM_CXSCREEN); 3#dz6+
int Height=GetSystemMetrics(SM_CYSCREEN); Cc%{e9e*
bm.CreateCompatibleBitmap(&dc,Width,Height); @H4]Gp ]
CDC tdc; fsw[R0B
tdc.CreateCompatibleDC(&dc); \f(zMP
CBitmap*pOld=tdc.SelectObject(&bm); E"S#d&9
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |o9`h 9i
tdc.SelectObject(pOld); w%iwxo
BITMAP btm; |&W4Dkn
bm.GetBitmap(&btm); _#&oQFdYR
DWORD size=btm.bmWidthBytes*btm.bmHeight; vxC];nCC#
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4Otq3s34FT
BITMAPINFOHEADER bih; GQhy4ji'z
bih.biBitCount=btm.bmBitsPixel; ^dhx/e%s
bih.biClrImportant=0; tvFe_*Ck
bih.biClrUsed=0; d4^x,hzV
bih.biCompression=0; =7H\llL4BC
bih.biHeight=btm.bmHeight; _&9P&Zf4
bih.biPlanes=1; [TUs^%2@
bih.biSize=sizeof(BITMAPINFOHEADER); Q3&DA1b`
bih.biSizeImage=size; #Y=b7|l
bih.biWidth=btm.bmWidth; z~~pH9=c2
bih.biXPelsPerMeter=0; &p_iAMn:9
bih.biYPelsPerMeter=0; n^l*oEl
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6m(? (6+;K
static int filecount=0; 9*K-d'm
CString name; a@|H6:|
name.Format("pict%04d.bmp",filecount++); ,Zb
name=m_Path+name; A[7H-1-
BITMAPFILEHEADER bfh; -C~zvP;a
bfh.bfReserved1=bfh.bfReserved2=0; PlS)Zv3
bfh.bfType=((WORD)('M'<< 8)|'B'); -qaO$M^Q
bfh.bfSize=54+size; 0#8, (6
bfh.bfOffBits=54; ;]m;p,$
CFile bf; 32SkxcfrCK
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :A @f[Y'9
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )[ZXPD
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T$R#d&t
bf.WriteHuge(lpData,size); VV}"zc^
bf.Close(); f+s)A(?3
nCount++; #V]8FW
} |gu@b~8
GlobalFreePtr(lpData); _b-g^#L%
if(nCount==1) Qb>("j~Z
m_Number.Format("%d picture captured.",nCount); )uo".n|n~B
else 3%GsTq2o
m_Number.Format("%d pictures captured.",nCount); $|J+
UpdateData(FALSE); 7 L,`7k|
} 7#G!es
MaY_*[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0uW)&>W
{ UYJ>L
if(pMsg -> message == WM_KEYDOWN) *C+[I
{ ?Sa,n^b*H
if(pMsg -> wParam == VK_ESCAPE) J(/J;PW
return TRUE; y }R2ZO
if(pMsg -> wParam == VK_RETURN) hFr+K1
return TRUE; #rGCv~0*l
} @%L
return CDialog::PreTranslateMessage(pMsg); $!9/s S?
} Z]TQ+9t
Y%eW6Y#
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ':_gYA
{ X o9vE3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j?]+~
SaveBmp(); $V?sD{=W
return FALSE;
=A'JIssk
} ~aQR_S
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C6a-
CMenu pop; 85[
7lO)[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~Y*.cGA
CMenu*pMenu=pop.GetSubMenu(0); Ank_;jo
pMenu->SetDefaultItem(ID_EXITICON); dz/fSA
CPoint pt; Cu24xP`
GetCursorPos(&pt); m,q)lbRl
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); N5=}0s]e
if(id==ID_EXITICON) ^mFsrw
DeleteIcon(); +MaEet
else if(id==ID_EXIT) GeB&S!F
OnCancel(); ?f'`b<o
return FALSE; M.MQ?`_"b
} "a'I^B/
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N: 38N
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) o~9*J)X5i
AddIcon(); i>CR{q
return res; n[K%Xs)
} Q{uO/6
-]u>kjiIT
void CCaptureDlg::AddIcon() is^R8a
{ K3tW Y
4-
NOTIFYICONDATA data; Oe@w$?
data.cbSize=sizeof(NOTIFYICONDATA); PX&}g-M9
CString tip; +,ar`:x&a
tip.LoadString(IDS_ICONTIP); H\<0{#F
data.hIcon=GetIcon(0); C\BKdx5;
data.hWnd=GetSafeHwnd(); yY49JZ
strcpy(data.szTip,tip); |P|2E~[r
data.uCallbackMessage=IDM_SHELL; mr#.uhd.z
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; VbJE zl
data.uID=98; dJ])`S
Shell_NotifyIcon(NIM_ADD,&data); i(.PkYkaq
ShowWindow(SW_HIDE); Ev [?5R
bTray=TRUE; <im}R9eJ1
} #>lbpw
( )ldn?v
void CCaptureDlg::DeleteIcon() lnjs{`^
{ "10\y{`v^
NOTIFYICONDATA data; V62lN<M
data.cbSize=sizeof(NOTIFYICONDATA); (]I=';\
data.hWnd=GetSafeHwnd(); Wrp+B[{r\
data.uID=98; r]D>p&4
Shell_NotifyIcon(NIM_DELETE,&data); }u0&> k|y
ShowWindow(SW_SHOW); fiSX( 9
SetForegroundWindow(); &{a#8sbf#c
ShowWindow(SW_SHOWNORMAL); WpE"A
bTray=FALSE; Xf7]+
} nC??exc
eUCBQK
void CCaptureDlg::OnChange() f8r7SFwUv
{ +/mCYI
RegisterHotkey(); f!5w+6(
} BU>R<A5h
4o@:+T:1
BOOL CCaptureDlg::RegisterHotkey() 811QpYA
{ 1?8M31
UpdateData(); T9r6,yY
UCHAR mask=0; \?8q&o1=]
UCHAR key=0; ..'"kX:5
if(m_bControl) eA
Fp<2g
mask|=4; x]%,?Vd?
if(m_bAlt) Gkfzb>_V]
mask|=2; ~/aCzx~
if(m_bShift) j)iUg03>/4
mask|=1; \/Q~C!
key=Key_Table[m_Key.GetCurSel()]; X#h a*u~U
if(bRegistered){ *x p_#
DeleteHotkey(GetSafeHwnd(),cKey,cMask); D[6sy`5l
bRegistered=FALSE; ".#h$
} ~Cyn w(
cMask=mask; |<oqT+?i
cKey=key; x.|sCqx
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); c0&!S-4M
return bRegistered; d>zC[]1
} ""N~##)8
0/7.RpX,.
四、小结 u:W/6QS
152s<lu1Z
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。