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:
~5e)h_y
/DPD,bA 一、实现方法
%<cfjo *^]Hqf(` 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:
0zR4Kj7EE EN^C'n #pragma data_seg("shareddata")
A*)G. o: HHOOK hHook =NULL; //钩子句柄
D;%(Z! UINT nHookCount =0; //挂接的程序数目
Vo*38c2 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
*T(z4RVg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
g~EJja; static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
FSnF>3kj- static int KeyCount =0;
WZkAlg7Z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
0'ha!4h3Z #pragma data_seg()
9/N=7<$ Hk)IV"[R 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。
"p<B| u*#j;Xc 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:
s>8;At- =?Y%w%2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
+AVYypql8K cKey,UCHAR cMask)
A1{ 7g<k6 {
\bJ,8J1C BOOL bAdded=FALSE;
4,D$% . for(int index=0;index<MAX_KEY;index++){
ZuV/!9qU if(hCallWnd[index]==0){
e RiP C hCallWnd[index]=hWnd;
,A`.u \f(: HotKey[index]=cKey;
1+\ZLy!5: HotKeyMask[index]=cMask;
04eE\%? bAdded=TRUE;
saMv.;s
1^ KeyCount++;
a#i;*J break;
":t'}Eg=6 }
&m@~R| }
1&_93 return bAdded;
V[&4Km9C }
t#pF.!9= //删除热键
kaBP&6|Z
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"o+E9'Dm {
I"/p^@IX BOOL bRemoved=FALSE;
ROZOX$XM for(int index=0;index<MAX_KEY;index++){
t;ZA}>/ if(hCallWnd[index]==hWnd){
hrsMAh! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_&0_@ hCallWnd[index]=NULL;
5$C4Ui{<E' HotKey[index]=0;
BJzNh>-#= HotKeyMask[index]=0;
e))fbv&V bRemoved=TRUE;
[d+f#\ut KeyCount--;
-*;-T9 break;
*aKT&5Ch- }
g]B!
29M }
p
BU,"Yy& }
b(<#n6a}\ return bRemoved;
q}vz]L&o }
*Mu X]JK >>}4b2U :q6j{C( DLL中的钩子函数如下:
kjWY{7b! EyJWi< LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Eg&oAY.U {
e!_+TyI BOOL bProcessed=FALSE;
0 t. '?= if(HC_ACTION==nCode)
O>P792) {
)TNAgTmqK if((lParam&0xc0000000)==0xc0000000){// 有键松开
JO\F-xO switch(wParam)
9b
K K {
obYXDj2 case VK_MENU:
sC
,[CN:b MaskBits&=~ALTBIT;
=7&2-'(@ break;
w}*2Hz&Q! case VK_CONTROL:
G[34:J MaskBits&=~CTRLBIT;
~N{ 7 break;
Ko6>h case VK_SHIFT:
)n8(U%q$ MaskBits&=~SHIFTBIT;
//9M~qHa" break;
!JZ)6mtlr default: //judge the key and send message
y7)s0g>%H break;
MfzSoxCb }
3LT[?C]H$ for(int index=0;index<MAX_KEY;index++){
Tk(ciwB if(hCallWnd[index]==NULL)
,{{e'S9cy continue;
:u}FF"j if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\F_~?$ {
-oSfp23u SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
RweK<Flo'S bProcessed=TRUE;
&p/^A[ }
9 F"2$; }
&O0@)jIV }
I)@b#V= else if((lParam&0xc000ffff)==1){ //有键按下
zT;F4_p3G- switch(wParam)
+k@$C,A {
:aYbP,mE case VK_MENU:
z)z_] c-X+ MaskBits|=ALTBIT;
.2y2Qm break;
& ,KxE(C case VK_CONTROL:
!3]}3jZ. MaskBits|=CTRLBIT;
!3Xu#^Xxj break;
AQCU\E case VK_SHIFT:
zR)9]pJ- MaskBits|=SHIFTBIT;
KW&5&~)2 break;
J|vriI; default: //judge the key and send message
Qyn~Vu43 break;
7#\\Ava$T }
lO?dI=}] for(int index=0;index<MAX_KEY;index++){
rlQ4+~ if(hCallWnd[index]==NULL)
aTJs.y-I~ continue;
?V3kIb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
} v#Tm {
+mc0:e{WF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1trk bProcessed=TRUE;
-Xm/sq(i)% }
Iu<RwB[#Q }
58T<~u7 }
MiB"CcU if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
|$Y0VC4a for(int index=0;index<MAX_KEY;index++){
_*(n2'2B if(hCallWnd[index]==NULL)
9d4Agj
M continue;
0~.OMG:= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
x RV@_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
}Xn5M&>? //lParam的意义可看MSDN中WM_KEYDOWN部分
Yv}V =O% }
pf_(?\oz> }
OQ,KQ\ }
:BIgrz"Jz return CallNextHookEx( hHook, nCode, wParam, lParam );
<{
Z$!]i1 }
\YV`M3O W<W5ih,# 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
#x)lN =#tQhg,_ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
@"B"*z-d BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Re`'dde= HY
(|31 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
D_n(T') v/\in'H~ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
X-xN<S q {
/hx|KC&:e if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
!KYX\HRW {
j?5s/ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
K'Gv+UC*6 SaveBmp();
!N, Oe< return FALSE;
hB]\vA7 }
p>GTFXEi6 …… //其它处理及默认处理
zjuU*$A4 }
}]i re2j8 Sdk:-Zuv 3&'u7e 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。
D #<)q) OPYl#3I 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。
//[zUn ENmfbJ4d~ 二、编程步骤
v6Vd V.BI h x_,>\@ 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";
p5 !B 4P1<Zi+< 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
`pB]_"b R~=_,JUW 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;
ZS@ Gt [;rty<Z^b 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;
nPAVrDg
O g~>g]) 5、 添加代码,编译运行程序。
DU@ZLk3 %Ls5:Z= 三、程序代码
L?WF[nFR G;^}, %< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
{$dq7m( #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
tEj-c@`"x- #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Oa8lrP`( #if _MSC_VER > 1000
>?pWbL #pragma once
BqF%2{ #endif // _MSC_VER > 1000
=\t%U5 #ifndef __AFXWIN_H__
m1](f[$ #error include 'stdafx.h' before including this file for PCH
st|;]q9? #endif
L<GF1I) #include "resource.h" // main symbols
~E]ct F class CHookApp : public CWinApp
N+l 0XjZD9 {
#
p?7{"Ep public:
Z9TUaMhF CHookApp();
Y?1
3_~
K // Overrides
jbDap i< // ClassWizard generated virtual function overrides
qHAZ)Tz //{{AFX_VIRTUAL(CHookApp)
51,RbADB public:
]8Eci^i virtual BOOL InitInstance();
=V)88@W
virtual int ExitInstance();
BA1|%:. //}}AFX_VIRTUAL
M9_G //{{AFX_MSG(CHookApp)
`PV+.V} // NOTE - the ClassWizard will add and remove member functions here.
7W{xK'|] // DO NOT EDIT what you see in these blocks of generated code !
3 &aBU[ //}}AFX_MSG
/b$0).fj@, DECLARE_MESSAGE_MAP()
V*$(T t( };
2l7Sbs7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
/b44;U`v5- BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
'aq9]D_k BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Z~JX@s0v BOOL InitHotkey();
3)?v BOOL UnInit();
\0{g~cU4 #endif
2
/rDi 6:(R/9!P //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
W(C\lSE0 #include "stdafx.h"
*%{ #include "hook.h"
3!+N}[$iy #include <windowsx.h>
QNGICG- #ifdef _DEBUG
5WT^;J9V #define new DEBUG_NEW
#/UlW #undef THIS_FILE
APfDy static char THIS_FILE[] = __FILE__;
# 1S*}Q<k #endif
DE0gd
ux8 #define MAX_KEY 100
xh7[{n[; #define CTRLBIT 0x04
NI@$" #define ALTBIT 0x02
,>: #define SHIFTBIT 0x01
BW`)q/ #pragma data_seg("shareddata")
yq?7!X HHOOK hHook =NULL;
R%(ww UINT nHookCount =0;
oj8_e xx static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Sxj _gn static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
86]})H static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
#P)7b,3pe static int KeyCount =0;
gwf*M3( static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
1X5*V!u #pragma data_seg()
|Lq -vs? HINSTANCE hins;
/~4wM#Yi8 void VerifyWindow();
m]Sv>| BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
R5y+bMZ //{{AFX_MSG_MAP(CHookApp)
wR x5` @ // NOTE - the ClassWizard will add and remove mapping macros here.
3?}W0dZ$d // DO NOT EDIT what you see in these blocks of generated code!
X5(S+;v"^ //}}AFX_MSG_MAP
.U66Uet>RX END_MESSAGE_MAP()
`I\)Kk@*b9 ZL0':7 CHookApp::CHookApp()
BQs~>}(V {
isdEs k#A. // TODO: add construction code here,
"Yk3K^`1T. // Place all significant initialization in InitInstance
7 Q`'1oE? }
$Iu N(# |k
# ~ CHookApp theApp;
A7/
R5p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
FY^#%0~ {
Kb<^Wdy4T BOOL bProcessed=FALSE;
~#doJ:^H3 if(HC_ACTION==nCode)
H-*"%SJ {
6{XdLI if((lParam&0xc0000000)==0xc0000000){// Key up
l~Em2@c switch(wParam)
]>K02SVT: {
BUuU#e5 case VK_MENU:
_?5$ST@5 MaskBits&=~ALTBIT;
2'R&K break;
i$Rlb5RU case VK_CONTROL:
SO}$96 MaskBits&=~CTRLBIT;
;w^-3 U7: break;
|bHId!d case VK_SHIFT:
F(-1m A&- MaskBits&=~SHIFTBIT;
?q68{!{bi break;
6Y#V;/gK!5 default: //judge the key and send message
4z~%gt74O] break;
&HPzm6.3 }
";)SA,Z for(int index=0;index<MAX_KEY;index++){
.szs? if(hCallWnd[index]==NULL)
[jOvy>2K] continue;
*ybwlLg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
OMr &f8 {
Kg#5
@; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
NwK(<dzG bProcessed=TRUE;
)$#
Ku2X }
QQd%V#M? }
*@M7J }
~)RKpRga\p else if((lParam&0xc000ffff)==1){ //Key down
3$R^tY2UU switch(wParam)
%cWy0:F5VY {
qJ;T$W=NG case VK_MENU:
w
Wx,}= MaskBits|=ALTBIT;
~MvLrg"i break;
_` %z case VK_CONTROL:
G8JwY\ MaskBits|=CTRLBIT;
HxC_nh break;
''@upZBJ case VK_SHIFT:
_]W
}6?i MaskBits|=SHIFTBIT;
g@&@]63 break;
;'o:1{Y default: //judge the key and send message
\XG18V& break;
E&?z-,-o@ }
ozs
xqN for(int index=0;index<MAX_KEY;index++)
Iw?M>'l {
+sTZ)
5vQ if(hCallWnd[index]==NULL)
=4;GIiF@ continue;
IZ2c<B5& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
R+c
{Pl {
(I bT5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
W^c> (d</ bProcessed=TRUE;
)8H5ovj. }
zUw9 }
c`'2 }
Z/z(P8#U\ if(!bProcessed){
u>G#{$) for(int index=0;index<MAX_KEY;index++){
I|6wPV? if(hCallWnd[index]==NULL)
Unl6?_ continue;
N6GvzmG#g if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
`_IgH SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
"}"Bvp^ }
QfI)+pf }
\#bk$R@ }
6 u3$ .Q return CallNextHookEx( hHook, nCode, wParam, lParam );
[qHLo>HaL }
#&Zb8HAj GC{)3)_ t BOOL InitHotkey()
x<
Td {
F5CV<-jB if(hHook!=NULL){
9d7$Fz# nHookCount++;
G<1awi return TRUE;
xD f<@ }
2?]NQE9lA else
4= VAJ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!l7eB@O if(hHook!=NULL)
1|za>N6[yu nHookCount++;
WQ\H2go return (hHook!=NULL);
DR."C+ }
Kn]c4h}@b5 BOOL UnInit()
-U6" Ce {
`Gl@?9,i if(nHookCount>1){
=YPvh]][ nHookCount--;
oGzZ.K3 A return TRUE;
y;N[#hY#CD }
S`LS/) BOOL unhooked = UnhookWindowsHookEx(hHook);
bDLPA27 if(unhooked==TRUE){
09Sy-
je*/ nHookCount=0;
oG! S(95 hHook=NULL;
a@&^t( 1 }
3{mu 77 return unhooked;
0@R @L}m }
q4XS
E, x(e=@/qp BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
LB<,(dyh {
l
vuoVINEp BOOL bAdded=FALSE;
WJG& `PP for(int index=0;index<MAX_KEY;index++){
L< MIl[z7 if(hCallWnd[index]==0){
EJ* hCallWnd[index]=hWnd;
x,Im%!h HotKey[index]=cKey;
PvzB, 2": HotKeyMask[index]=cMask;
*D: wwJ bAdded=TRUE;
S[o_$@| KeyCount++;
q?x.P2 break;
+L4_] }
i,=CnZCh }
c
k= return bAdded;
LoHL}1BG- }
:/H fMJ Pv.z~~lY BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$u"t/_% {
iJg3`1@j BOOL bRemoved=FALSE;
:Mss"L820 for(int index=0;index<MAX_KEY;index++){
wo;`D if(hCallWnd[index]==hWnd){
@u./VK if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
d%$'Y| hCallWnd[index]=NULL;
Y'NQt?h HotKey[index]=0;
< PoRnx HotKeyMask[index]=0;
gAe*kf1 bRemoved=TRUE;
Xa._ KeyCount--;
o0:[,ock break;
6x*u S~' }
pn6 e{ }
Hu
.e@7 }
ER:)Fk>_ return bRemoved;
4Fr0/="H }
;!(.hCHvr ;J3az` void VerifyWindow()
IrU}%ZVV {
x\vb@!BZ for(int i=0;i<MAX_KEY;i++){
W&[}-E8<Y if(hCallWnd
!=NULL){ {`0GAW)q
if(!IsWindow(hCallWnd)){ Ly?yWS-x
hCallWnd=NULL; /? n 9c;w
HotKey=0; @0`Q
HotKeyMask=0; lZTD>$
KeyCount--; wL]7d3t
} n<;TBK
} sF?N vp
} v*Qr(4
} i[b?W$]7
pIh%5ZU
BOOL CHookApp::InitInstance() uy~KJn?Tu
{ [@@Ovv
AFX_MANAGE_STATE(AfxGetStaticModuleState()); *yGOmi
hins=AfxGetInstanceHandle(); >r7{e:~q
InitHotkey(); $wa )e
return CWinApp::InitInstance(); K[ZgT$zZ
} iVM{ L
:%Dw3IrOM
int CHookApp::ExitInstance() h(hb?f@1:
{ `;L0ax
VerifyWindow(); W?m?r.K?
UnInit(); DXAA[hUjF
return CWinApp::ExitInstance(); ZFy>Z:&S,
} 1!RD
kZwe
dA<PQKm
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {q2H_H
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s1XW}Dw
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /i+8b(x
#if _MSC_VER > 1000 "1rZwFI0l
#pragma once JHN35a+
#endif // _MSC_VER > 1000 Pm]6E[zC
^'DrU<o
class CCaptureDlg : public CDialog 24 S,w>j
{ 6Cut[*lj^
// Construction I(r ^q"
public: [o)P
BOOL bTray; J;Az0[qMR
BOOL bRegistered; #2c-@),
BOOL RegisterHotkey(); 5-|fp(Ww_W
UCHAR cKey; ~:."BA
UCHAR cMask; =4
&/Pr
void DeleteIcon(); h3.wR]ut
void AddIcon();
pmAir:
UINT nCount; 5fS89?/?
void SaveBmp(); xUE 9%qO
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ue|]M36
// Dialog Data /+G&N{)k
//{{AFX_DATA(CCaptureDlg) Au'[|Prr
enum { IDD = IDD_CAPTURE_DIALOG }; Sk@~}
CComboBox m_Key; Fl GKy9k
BOOL m_bControl; vkan+~H
BOOL m_bAlt; ='=\!md
BOOL m_bShift; 2~+Iu+
CString m_Path; ?6@Y"5
z3g
CString m_Number; e[}R1/!L
//}}AFX_DATA ,R$n I*mf_
// ClassWizard generated virtual function overrides Qz;2RELz
//{{AFX_VIRTUAL(CCaptureDlg)
>lqWni
public: v/f&rK* >
virtual BOOL PreTranslateMessage(MSG* pMsg); d[z+/L
protected: Gnmj-'x
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6C>x,kU
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9 ="i'nYp
//}}AFX_VIRTUAL a3]'%kKp
// Implementation 9PEjV$0E2
protected: M:h~;+s
HICON m_hIcon; Ow=` tv$l
// Generated message map functions -\yaP8V
//{{AFX_MSG(CCaptureDlg) [Dp 6q~RM
virtual BOOL OnInitDialog(); b9HE #*d,
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =rS z>l
afx_msg void OnPaint(); -nG3(n&wB
afx_msg HCURSOR OnQueryDragIcon(); 4RsV\Y{FN
virtual void OnCancel(); +ib72j%A
afx_msg void OnAbout(); C(C4R+U
afx_msg void OnBrowse(); z%t>z9hU
afx_msg void OnChange(); 5I5~GH
//}}AFX_MSG
]SpUD
DECLARE_MESSAGE_MAP() BvpGP
}; ymybj
#endif !8ub3oj)
,WbO8#z+
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file UT$G?D";M
#include "stdafx.h" tsq]QTA*
#include "Capture.h" b#|M-DmT
#include "CaptureDlg.h" |SXMd'<3`Z
#include <windowsx.h> =x}27f%-Mg
#pragma comment(lib,"hook.lib") oQ@X}6B%S
#ifdef _DEBUG 0Z#&!xTb
#define new DEBUG_NEW 3/o-\wWO
#undef THIS_FILE ;ej;<7+
static char THIS_FILE[] = __FILE__; vBQ|h
#endif :*TfGV
#define IDM_SHELL WM_USER+1 h,<%cvU=
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iNf+ -C3
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P5Ms
X~mT
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; a;m-Vu!
class CAboutDlg : public CDialog yef@V2Z+
{ `p9h$d
public: [-_u{j
CAboutDlg(); m6Q lIdl
// Dialog Data yL&F!+(/Ix
//{{AFX_DATA(CAboutDlg) (Ac
'}O
enum { IDD = IDD_ABOUTBOX }; ZVE q{x1Zc
//}}AFX_DATA o
<8L,u(U
// ClassWizard generated virtual function overrides $zq`hI!1
//{{AFX_VIRTUAL(CAboutDlg) 9)s=%dL
protected: "YHqls} c
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 31k.{dnm
//}}AFX_VIRTUAL h9LA&!
// Implementation %v:9_nwO)
protected: *nU7v3D
//{{AFX_MSG(CAboutDlg) d@pD5n=m;
//}}AFX_MSG 5[[ 4A]#T
DECLARE_MESSAGE_MAP() ^3IO.`|
}; $d?<(n
?AX./LI
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Lm"a3Nb
{ P-[6xu+]
//{{AFX_DATA_INIT(CAboutDlg) fZH:&EP
//}}AFX_DATA_INIT F))+a&O
} ]H) x
K[PIw}V$?:
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \MQ|(
{ He. gl
CDialog::DoDataExchange(pDX); "CBe$b4
//{{AFX_DATA_MAP(CAboutDlg) W1M<6T.{7
//}}AFX_DATA_MAP =:mD)oX*
} )P@t,mxW/
|i7|QLUT
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3,e^;{w
//{{AFX_MSG_MAP(CAboutDlg) Hn0,LH$/
// No message handlers y^=\w?d
//}}AFX_MSG_MAP rgdDkWLXC
END_MESSAGE_MAP() QRhR.:M\
G/\t<>O8o
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )nJs9}( 0
: CDialog(CCaptureDlg::IDD, pParent) i[@*b/A
{ {e0cc1Up}
//{{AFX_DATA_INIT(CCaptureDlg) 6;9SU+/
m_bControl = FALSE; Xa\{WM==;
m_bAlt = FALSE; HlgF%\@a+U
m_bShift = FALSE; 7qq}wR]]
m_Path = _T("c:\\"); 0RN]_z$;H
m_Number = _T("0 picture captured."); C4&yC81Gm
nCount=0; 9a"[-B:
bRegistered=FALSE; WE 'afxgV
bTray=FALSE; ^aN;M\
//}}AFX_DATA_INIT Eic/#j{4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ko*Ir@SDv
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); kJq8"Klg
} L;H(I@p(e
7NV1w*>/
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |"?0H#
{ [>Z~&cm
CDialog::DoDataExchange(pDX); A#RA;Dt:
//{{AFX_DATA_MAP(CCaptureDlg) 'J#u;KJ
DDX_Control(pDX, IDC_KEY, m_Key);
IM|VGT0
DDX_Check(pDX, IDC_CONTROL, m_bControl); i-~HT4iw
DDX_Check(pDX, IDC_ALT, m_bAlt); l4u_Z:<w
DDX_Check(pDX, IDC_SHIFT, m_bShift); rePJ4i [y
DDX_Text(pDX, IDC_PATH, m_Path); IQf:aX
DDX_Text(pDX, IDC_NUMBER, m_Number); Z{xm(^'i
//}}AFX_DATA_MAP &z8@ rk|
} &]3_ .C
6MvjNbQ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7RM$%'n\
//{{AFX_MSG_MAP(CCaptureDlg) h7f&7v
ON_WM_SYSCOMMAND() :^j`wd1
h
ON_WM_PAINT() _@;t^j+l
ON_WM_QUERYDRAGICON() K[PH#dF5,x
ON_BN_CLICKED(ID_ABOUT, OnAbout) UUc{1"z{
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lt`(R*B%
ON_BN_CLICKED(ID_CHANGE, OnChange) a` A V
//}}AFX_MSG_MAP W~2`o*\l
END_MESSAGE_MAP() .z4
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A}?n.MAX>
BOOL CCaptureDlg::OnInitDialog() x>d,\{U
{ zBtlkBPu
CDialog::OnInitDialog(); P!3)-apP\
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); IWERn
v!
ASSERT(IDM_ABOUTBOX < 0xF000); DKnjmZ:J|
CMenu* pSysMenu = GetSystemMenu(FALSE); /J )MW{;O
if (pSysMenu != NULL) A-Be}A
{ 4qXO8T#~J=
CString strAboutMenu; $!%/Kk4M
strAboutMenu.LoadString(IDS_ABOUTBOX); o8;>E>;
if (!strAboutMenu.IsEmpty()) fT.18{'>
{ pyYm<dn
pSysMenu->AppendMenu(MF_SEPARATOR); ^0py
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N}Q%y(O^
} 0Am&:kX't
} uP2e/a
SetIcon(m_hIcon, TRUE); // Set big icon m1H_kJ
SetIcon(m_hIcon, FALSE); // Set small icon b6Pi:!4
m_Key.SetCurSel(0); wO9|_.Z{
RegisterHotkey(); ej,j1iB
CMenu* pMenu=GetSystemMenu(FALSE); k/o"E
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); }vzP\
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q$_y +[
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #{KYsDtvx
return TRUE; // return TRUE unless you set the focus to a control |fqYMhA U
}
2%P{fJbwd
A?V}$PTlx
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X)^eaw]Q0
{ E7X6Shng
if ((nID & 0xFFF0) == IDM_ABOUTBOX) AGu#*,K
{ Z>
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CAboutDlg dlgAbout; .P(k |D&
dlgAbout.DoModal(); p^QZGu-.W
} RQxL`7H
else /}A"F[5
{ n]:Xmi8p
CDialog::OnSysCommand(nID, lParam); 4o?_G[
} " O0p.o
} >L[n4x\
3}R}|Ha
J#
void CCaptureDlg::OnPaint() 36"-cGNr{
{ S"hA@j
if (IsIconic()) M|8vP53=q
{ 4FrP%|%E~
CPaintDC dc(this); // device context for painting 8 *o*?1.
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); GPV=(}z
// Center icon in client rectangle &iKy
int cxIcon = GetSystemMetrics(SM_CXICON); =2v/f_
int cyIcon = GetSystemMetrics(SM_CYICON); z7TMg^9#
CRect rect; Io_bS+
GetClientRect(&rect); 8'XAZSd(
int x = (rect.Width() - cxIcon + 1) / 2; -wn,7;
int y = (rect.Height() - cyIcon + 1) / 2; ^f6pw!
// Draw the icon :jL>sGvBv
dc.DrawIcon(x, y, m_hIcon); "?9rJx$
} ;B*im
S10
else wT\JA4
{ -wr#.8rzTT
CDialog::OnPaint(); "3 Y(uN
} wr);+.T9R
} ]M3V]m
$fifx>!
HCURSOR CCaptureDlg::OnQueryDragIcon() 7p1f*N[X
{ k Il!n
return (HCURSOR) m_hIcon; Gbj^o o
} vYl2_\,Y?
}fC=
void CCaptureDlg::OnCancel() RTC;Wj
{ <c'0-=
if(bTray) .cks){\
DeleteIcon(); Iu"7
CDialog::OnCancel(); H!SFSgAu
} - t#YL
*G rYB6MT
void CCaptureDlg::OnAbout() V[DiN~H
{ OHRkhwF.
CAboutDlg dlg; d{/#A%.
dlg.DoModal(); P^'TI[\L9
} :/A7Z<u,
Ymvd3> _
void CCaptureDlg::OnBrowse() a+mrsyM
{ iYaS
CString str; *Wj]e%
BROWSEINFO bi; N!~O~Eo3
char name[MAX_PATH];
'ug:ic
ZeroMemory(&bi,sizeof(BROWSEINFO)); deLLqdZa
bi.hwndOwner=GetSafeHwnd(); w'uB&z4'
bi.pszDisplayName=name; LNNwy:_ !
bi.lpszTitle="Select folder"; XXDLbT'J
bi.ulFlags=BIF_RETURNONLYFSDIRS; XrUc`
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7l(GBr
if(idl==NULL) jw5ldC>U
return; 'G>$W+lT^
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )kMF~S|H
str.ReleaseBuffer(); 0RZ[]:(
m_Path=str; Wn%b}{9Fb
if(str.GetAt(str.GetLength()-1)!='\\') Cer&VMrQK
m_Path+="\\"; <%4M\n
UpdateData(FALSE); mNA=<O;i)'
} ;yu#Bs
=;Q:z^S
void CCaptureDlg::SaveBmp() 0u) m9eg
{ h0.2^vM)R
CDC dc; n }kn|To~
dc.CreateDC("DISPLAY",NULL,NULL,NULL); q-hR EO
CBitmap bm; \s?8}k
int Width=GetSystemMetrics(SM_CXSCREEN); U9"(jl/o
int Height=GetSystemMetrics(SM_CYSCREEN); 9Bao~(j/k
bm.CreateCompatibleBitmap(&dc,Width,Height); !S~0T!afF
CDC tdc; WQ+ xS!ba
tdc.CreateCompatibleDC(&dc);
CK+t6Gp
CBitmap*pOld=tdc.SelectObject(&bm); {8* d{0l
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3\}>nE
tdc.SelectObject(pOld); gNHS:k\"
BITMAP btm; FG!2h&k
bm.GetBitmap(&btm); nEt{ltsS0
DWORD size=btm.bmWidthBytes*btm.bmHeight; ;Zm-B]\
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^UCH+Cyl
BITMAPINFOHEADER bih; G^|!'V
bih.biBitCount=btm.bmBitsPixel; 6gs0Vm
bih.biClrImportant=0; 6Ki!j<
bih.biClrUsed=0; 9-+N;g!q
bih.biCompression=0; KAJR.YNm
bih.biHeight=btm.bmHeight; 5) q_Aro
bih.biPlanes=1; Xp+lpVcJ
bih.biSize=sizeof(BITMAPINFOHEADER); r;^%D(
bih.biSizeImage=size; lqTc6@:D
bih.biWidth=btm.bmWidth; r2*8.j51
bih.biXPelsPerMeter=0; NkV81?
bih.biYPelsPerMeter=0; A?bqDy
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9.%t9RM^
static int filecount=0; iE?yvtr8
CString name; W)Ct*I^
name.Format("pict%04d.bmp",filecount++); UgLFU#
name=m_Path+name; q|{z9V<
BITMAPFILEHEADER bfh; ,!40\"A
bfh.bfReserved1=bfh.bfReserved2=0; /\{emE\]
bfh.bfType=((WORD)('M'<< 8)|'B'); ?9;CC]D
bfh.bfSize=54+size; lc8g$Xw3
bfh.bfOffBits=54; OdbXna
CFile bf; ff;~k?L
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ esiU._:u
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); D 0Mxl?S?
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uBK0+FLL@
bf.WriteHuge(lpData,size); ]Twyj
bf.Close(); f(G1xw]]@Y
nCount++; c@2a)S8Y]
} oJZxRm[g$t
GlobalFreePtr(lpData); 7B<,nKd
if(nCount==1) : *XAQb0
m_Number.Format("%d picture captured.",nCount); ypgM&"eR
else Uc,MZV4
m_Number.Format("%d pictures captured.",nCount); R<
L =&I
UpdateData(FALSE); fK6[ p&
} ?[uHRBR'
C
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g>@a
{ bg!(B<!X
if(pMsg -> message == WM_KEYDOWN) dF[|9%)
{ hF{gN3v5
if(pMsg -> wParam == VK_ESCAPE) d>?C?F
return TRUE;
:>iN#)S
if(pMsg -> wParam == VK_RETURN) Z3yy(D>*
return TRUE; UEx13!iFo
} 1>uAVPa
return CDialog::PreTranslateMessage(pMsg); -g."{|
} 2F+"v?n=\
^mg:<_p
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) I 12Zh7Cc:
{ ufe|I
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5E]iv^q%
SaveBmp(); p+8o'dl8=
return FALSE; IG{lr
} :%z#s
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zYP6m3n
CMenu pop; }SC&6B?G
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }L(ZLt8Q
CMenu*pMenu=pop.GetSubMenu(0); Zs]n0iwM'@
pMenu->SetDefaultItem(ID_EXITICON); s=]NKJaQH
CPoint pt; gV-*z}`U
GetCursorPos(&pt); q1q9W@H
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gs3c1Qa3b
if(id==ID_EXITICON) }K={HW1>
DeleteIcon(); 'pT13RFD
else if(id==ID_EXIT) ? )h8uf4
OnCancel(); Yn[>Y)
return FALSE; j^5YFUwsQg
} [-VK!9pQ
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $ OG){'X
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,oUzaEX
AddIcon(); Z.&/,UU:4
return res; ]tXIe?>9
} `<|tC#<z
\gA<yz-;N
void CCaptureDlg::AddIcon() '#yqw%
{ >DUTmJxv
NOTIFYICONDATA data; n
7i5A:
data.cbSize=sizeof(NOTIFYICONDATA); 0TaI"/ai
CString tip; _
xym
tip.LoadString(IDS_ICONTIP); n807?FORB
data.hIcon=GetIcon(0); IIih9I`IR
data.hWnd=GetSafeHwnd(); uJCp
strcpy(data.szTip,tip); "AZ|u#0P
data.uCallbackMessage=IDM_SHELL; bZ1*:k2
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7)]boW~Q
data.uID=98; AmHj\NX$
Shell_NotifyIcon(NIM_ADD,&data); P
JATRJ1.
ShowWindow(SW_HIDE); _7\`xU
bTray=TRUE; Y<|JhqOXK
} cE:s\hG
m5iCvOP
void CCaptureDlg::DeleteIcon() M 9-Q
{ :A
zll s
NOTIFYICONDATA data; aXQS0>G%(
data.cbSize=sizeof(NOTIFYICONDATA); .CnZMw{'
data.hWnd=GetSafeHwnd(); mW4Cc1*
data.uID=98; YnuY/zDF
Shell_NotifyIcon(NIM_DELETE,&data); ,@c1X:
ShowWindow(SW_SHOW); *1Bq>h:
SetForegroundWindow(); tVO}{[U}
ShowWindow(SW_SHOWNORMAL); z
&Xl
bTray=FALSE; $1"gFg
} L /:^;j`c
<!g]q1
void CCaptureDlg::OnChange() _qR?5;v
{ EYn?YiVFU
RegisterHotkey(); w$/lq~zU
} haBmwq(f
,|d9lK`" P
BOOL CCaptureDlg::RegisterHotkey() _Iminet
{ :P}3cl_
UpdateData(); :Rb\Ca
UCHAR mask=0; j&,Gv@
UCHAR key=0; {N>ju
if(m_bControl) `@
YV
mask|=4; zwZvKV/g
if(m_bAlt) #lrwKHZ+
mask|=2; X+ITW#
if(m_bShift) 2zqaR[C
mask|=1; l>K+4
key=Key_Table[m_Key.GetCurSel()]; cN0
*<
if(bRegistered){ 1R3,Z8j'
DeleteHotkey(GetSafeHwnd(),cKey,cMask); !DzeJWM|
bRegistered=FALSE; ru@#s2
} PkrVQH9^w
cMask=mask; 9:4S[mz/hD
cKey=key; w.w{L=p:<"
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); x)*Lu">
return bRegistered; 72d|Jbd
} &RYdSXM
~*7$aj
四、小结 E+i*u
z'm}p
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。