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:
%[~g84@
vg@5`U`^h 一、实现方法
9C Ki$L ~@QAa (P. 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
"|Y y"iB[ sredL#]BA #pragma data_seg("shareddata")
|/ 8!PKm HHOOK hHook =NULL; //钩子句柄
lfd-!(tXD UINT nHookCount =0; //挂接的程序数目
c=?6`m,"M static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
t;PG static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
4s'%BM-r- static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
w@6y.v1I{ static int KeyCount =0;
*}Gys/\!S static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
,!,M'<?" #pragma data_seg()
T*C
F5S ^5?|Dj 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
{%P2.: ]mNsG0r6 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
L})*ck XDyo=A] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
/F|VYl^_ cKey,UCHAR cMask)
Slv:CM
M {
`)KGajB BOOL bAdded=FALSE;
ea`6J for(int index=0;index<MAX_KEY;index++){
(n2_HePE if(hCallWnd[index]==0){
3,*A VcQA hCallWnd[index]=hWnd;
WD[jEWMV7D HotKey[index]=cKey;
*uccY_ HotKeyMask[index]=cMask;
jA~omX2A bAdded=TRUE;
7PUy`H,& KeyCount++;
cH|J break;
7i02M~*uS }
'^7UcgugB }
'"LaaTTs return bAdded;
hcYqiM@8> }
d1t_o2 //删除热键
xb9^WvV BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4f~q$Sf]< {
lg ,% BOOL bRemoved=FALSE;
Y$)y:.2# for(int index=0;index<MAX_KEY;index++){
aM#xy6:XG if(hCallWnd[index]==hWnd){
JX&%5sn( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
v^p* l0r6: hCallWnd[index]=NULL;
*u,xBC2C HotKey[index]=0;
lZ2gCZ HotKeyMask[index]=0;
]-a/)8 bRemoved=TRUE;
[TqX"@4NS KeyCount--;
u}_x break;
kJNg>SN*@# }
ni )G }
tux`-F }
"A~D(1K return bRemoved;
8ql<7RTM! }
4OO^%`=)M' 2\|sXC $$Ibr]$5 DLL中的钩子函数如下:
Q?([# R*k;4*1u LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a0B%x!y^ {
"fSaM&@[B BOOL bProcessed=FALSE;
U;u4ey if(HC_ACTION==nCode)
#(a ;w {
(6[/7e) if((lParam&0xc0000000)==0xc0000000){// 有键松开
t%k`)p7O switch(wParam)
=>Qd {
i=rA;2> case VK_MENU:
;yjw(OAI* MaskBits&=~ALTBIT;
I*a.!/$) break;
Ytqx0 case VK_CONTROL:
Hl{ul'o MaskBits&=~CTRLBIT;
*&h]PhY break;
ft0d5n!ui4 case VK_SHIFT:
!mwMSkkq MaskBits&=~SHIFTBIT;
,Tx38 break;
~-%z:Re'_ default: //judge the key and send message
ZdPqU\G^q break;
_ogN
}
+ ~,q"6 for(int index=0;index<MAX_KEY;index++){
\FCPD.2s+ if(hCallWnd[index]==NULL)
i/!KUbt continue;
WHLTJ]OB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
d#ab"&$bv {
)/OIzbA3# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[{&OcEf bProcessed=TRUE;
>>y\idg&: }
]z=dRq }
B(eiRr3 }
T0b/txS else if((lParam&0xc000ffff)==1){ //有键按下
tF<&R&= switch(wParam)
!Bg^-F:N {
":=h1AJY case VK_MENU:
b%C7 kL- MaskBits|=ALTBIT;
zNn break;
?Lv U7 case VK_CONTROL:
[{vX*q
3B MaskBits|=CTRLBIT;
=W"T=p*j break;
!kh: zTP case VK_SHIFT:
g@?R" MaskBits|=SHIFTBIT;
]S@DVXH break;
t)O]0)
s default: //judge the key and send message
'b >3:& break;
h{jm }
I-kK^_0mV< for(int index=0;index<MAX_KEY;index++){
fti0Tz' if(hCallWnd[index]==NULL)
_KyhX| continue;
Ar_Yl|a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W%9~'pXgB {
h*Mi/\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fNyXDCl bProcessed=TRUE;
'fzJw }
zpNt[F?~1 }
]'>jw#|h }
Go]y{9+(7 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
{aopGu?i for(int index=0;index<MAX_KEY;index++){
W55kR.X6M if(hCallWnd[index]==NULL)
m5P@F@
continue;
n#4T o;CS if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z$/s` |] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kaECjZ_&+ //lParam的意义可看MSDN中WM_KEYDOWN部分
o##!S6:A }
E=,fdyj. }
Gu2=+?i?h }
2J3y
1 return CallNextHookEx( hHook, nCode, wParam, lParam );
3YUF\L]yyw }
mWLi XKnb M3JV^{O/DV 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:
U:PtRSdn!b e%9zY{ABR% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G%}k_vi&q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.+lx}#-# tTt}=hQpgX 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:
c2Y\bKeN O[|X=ZwR:l LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
HA&hu/mw_ {
s4=EyBI
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
=#{q#COK$ {
:#N]s //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
7o7FW=^ SaveBmp();
dn_l#$ U return FALSE;
q+?q[:nR- }
Y%zWaH …… //其它处理及默认处理
I}}>M# }
}%y5<n*v\ 5OAb6k' $g,v]MW 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。
ZlcEeG dtV7YPz4+ 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。
oGt2n: 25W #mh,' 二、编程步骤
OU?.}qc<wE UdpuQzV<4` 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";
T*(mi{[T ;j<#VS-] 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
q[. p(6:
-f<}lhmQ 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;
/f=31<+MtF _X{ GZJm 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;
scE#&OWF% ? a/\5`gnN 5、 添加代码,编译运行程序。
[BEQ ~A_I q1rD>n&d 三、程序代码
%."w]fy>P uj)fah?Wg ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
idjk uB(6 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
v++&% #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
{~'Iu8TvZ #if _MSC_VER > 1000
O`9vEovjs #pragma once
@ykl:K%ke #endif // _MSC_VER > 1000
' Yy+^iCus #ifndef __AFXWIN_H__
<(45(6fQ #error include 'stdafx.h' before including this file for PCH
vI"BNC*Q1 #endif
`j 4> #include "resource.h" // main symbols
' XOWSx;Y class CHookApp : public CWinApp
fM(~>(q& {
"|E'E"_1 public:
@F|pKf:M+ CHookApp();
{!1RlW // Overrides
''p<C)Q // ClassWizard generated virtual function overrides
aZq7(pen //{{AFX_VIRTUAL(CHookApp)
OgzKX>N`A public:
.k,,PuP virtual BOOL InitInstance();
8 9maN virtual int ExitInstance();
!&{"tL@. //}}AFX_VIRTUAL
E>u U6#v //{{AFX_MSG(CHookApp)
VMu?mqEa // NOTE - the ClassWizard will add and remove member functions here.
"9NWsy}<c // DO NOT EDIT what you see in these blocks of generated code !
K}Q:L(SSr\ //}}AFX_MSG
Fj`K$K? DECLARE_MESSAGE_MAP()
#9HX"<5
};
M>{*PHze0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
K d{o/R BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
xi)$t#K" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7T(&DOGZ BOOL InitHotkey();
Uu9I;q!| BOOL UnInit();
sy(.p^Z #endif
]L
k- -\ A(n3<(O/{Z //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
qsYg%Z #include "stdafx.h"
DyUS^iz~o #include "hook.h"
H=mFc@fh #include <windowsx.h>
p?4,YV|# #ifdef _DEBUG
LMLrH. #define new DEBUG_NEW
1c*;Lr.K #undef THIS_FILE
zNg[%{mz static char THIS_FILE[] = __FILE__;
~,x4cOdR# #endif
?kF?
~\c #define MAX_KEY 100
]\/"-Y#4Q #define CTRLBIT 0x04
3sl6$NKo #define ALTBIT 0x02
\GZ|fmYn #define SHIFTBIT 0x01
^W~8)Rbf #pragma data_seg("shareddata")
VU+=b+B~m HHOOK hHook =NULL;
w8`B}Dr23 UINT nHookCount =0;
jcRe), static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@qB>qD~WsD static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
$s"-r9@q static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
V \/Qik{h static int KeyCount =0;
4Zn [F^p static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ffsF], _J #pragma data_seg()
#6C<P!]V HINSTANCE hins;
6A ptq void VerifyWindow();
#wsi><7 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
mA^3?yj //{{AFX_MSG_MAP(CHookApp)
D/wJF[_ // NOTE - the ClassWizard will add and remove mapping macros here.
VKSn \HT~ // DO NOT EDIT what you see in these blocks of generated code!
E
*782> //}}AFX_MSG_MAP
G\~?.s|^ END_MESSAGE_MAP()
zd {sw} .dwbJT CHookApp::CHookApp()
6d3YLb4M$i {
.Y^pDR12 // TODO: add construction code here,
&%u m#XE // Place all significant initialization in InitInstance
C)QKodI }
;/)$Cm &e _\{/#J;lN CHookApp theApp;
f6{.Uq%SGp LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
;s+3#Py {
=>@
X+4Kb BOOL bProcessed=FALSE;
~Q}!4LH if(HC_ACTION==nCode)
\~l" {
PO,zP9 if((lParam&0xc0000000)==0xc0000000){// Key up
3r[s_Y* switch(wParam)
O,#,` 2Qc {
8EBd`kiq case VK_MENU:
[I7=]X MaskBits&=~ALTBIT;
(B03f$8}*_ break;
gLK0L%"5 case VK_CONTROL:
s}bLA>~Ta MaskBits&=~CTRLBIT;
$"MGu^0;1 break;
sH]T1z case VK_SHIFT:
xE!b) @>S MaskBits&=~SHIFTBIT;
(i1p6 break;
Nv3u)?A3w default: //judge the key and send message
[&(~1C|C break;
m[BpV.s }
ant2];0p for(int index=0;index<MAX_KEY;index++){
Z/ L%?zH if(hCallWnd[index]==NULL)
l8e)|MSh continue;
{ _Y'%Ggh if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\C{Zqo, {
/)<kG(Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^)h&s* bProcessed=TRUE;
+Eel|)Z*Q }
NLUiNfCR }
XD80]@\za }
{Z178sik else if((lParam&0xc000ffff)==1){ //Key down
Rm~8n;7oOr switch(wParam)
4JXJ0T ar {
B9H.8+~( case VK_MENU:
N2lz{ MaskBits|=ALTBIT;
C'S_M@I= break;
TP)o0U case VK_CONTROL:
j,z)x[3} MaskBits|=CTRLBIT;
OF:0jOW
break;
ZP-9KA$" case VK_SHIFT:
]cWQ9 MaskBits|=SHIFTBIT;
D%6}x^`Qk break;
(!Xb8rV0_ default: //judge the key and send message
I.`DBI#-f break;
H}(WL+7 }
qac:"z'9 for(int index=0;index<MAX_KEY;index++)
r$ I k*R {
_qh\
if(hCallWnd[index]==NULL)
<N3~X,ch continue;
z)Yb9y>2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*z0Rf; {
;ULw-&]P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%Z8pPH~T bProcessed=TRUE;
a)7&2J }
T7l,}G }
LvU/,.$ }
3Q2NiYg3 if(!bProcessed){
@moaa} 1 for(int index=0;index<MAX_KEY;index++){
Ak$9\Sl if(hCallWnd[index]==NULL)
/UaQ2h\ continue;
$-<yX<. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
k0TQFx.A SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fG{3S:TQq }
fd62m]X }
dF|R`Pa2ML }
1`l(H4 return CallNextHookEx( hHook, nCode, wParam, lParam );
MYR\W*B'b }
u=E &jL5U Ec }9R3 m BOOL InitHotkey()
qoW$Iw*q)B {
#jO2Zu2`} if(hHook!=NULL){
NGEE'4!i7T nHookCount++;
n7zM;@{7 return TRUE;
-^8OjGat }
Y^|15ek else
|:u5R% hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
G=C2l#
Ae! if(hHook!=NULL)
R@`xS<`L/ nHookCount++;
% 3fpIzm return (hHook!=NULL);
c;=St1eoz }
0
t/mLw& BOOL UnInit()
!"aGo1$$ {
0rif,{" if(nHookCount>1){
>:0N)Pj nHookCount--;
auM1k] return TRUE;
#W8c)gkG9 }
YF %]%^n BOOL unhooked = UnhookWindowsHookEx(hHook);
f/Z-dM\e if(unhooked==TRUE){
vq@"y%C4 nHookCount=0;
%:dd#';g hHook=NULL;
;2^zkmDM }
>!c Ff$2' return unhooked;
PE[5oH }
_ -,[U{ CurU6x1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?Qts2kae# {
;#*.@Or@Ah BOOL bAdded=FALSE;
h645;sb0 for(int index=0;index<MAX_KEY;index++){
CI+li H if(hCallWnd[index]==0){
d[E= HN hCallWnd[index]=hWnd;
}R:oWR HotKey[index]=cKey;
]n$ v ^ HotKeyMask[index]=cMask;
5cl^:Ua bAdded=TRUE;
V=+p8nE0 KeyCount++;
TaKCN break;
"`'+@KlE }
.RS }
g1B P return bAdded;
U<'$ \P }
9yLPh/!Ob s,D GFK BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H/*i-%]v+( {
")fgQ3XZ BOOL bRemoved=FALSE;
K5(T7S for(int index=0;index<MAX_KEY;index++){
x26 sH5 if(hCallWnd[index]==hWnd){
HhzP Kd if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j",*&sy hCallWnd[index]=NULL;
1o)<23q`) HotKey[index]=0;
Ysi@wK-LnF HotKeyMask[index]=0;
[y<s]C6E bRemoved=TRUE;
<FN+
KeyCount--;
](IOn:MuDE break;
#!rH}A>n+ }
|6`7kb;p }
h5^We"}+ }
Q"qJ0f) return bRemoved;
jank<Q&w }
j\.e6&5%SS ^Je*k)COn void VerifyWindow()
D9n+eZ {
9YBlMf`KEf for(int i=0;i<MAX_KEY;i++){
9,}Z1 f\% if(hCallWnd
!=NULL){ #O'g*]j
if(!IsWindow(hCallWnd)){ YKx+z[A/p
hCallWnd=NULL; \;"S>dg
HotKey=0; F<)f&<5E-
HotKeyMask=0; )EN,Ry
KeyCount--; 26j-1c!NGd
} `EiL~*
} LBcqFvj{&
} %Wc$S]>i
} #4Cf-$J
lB|.TCbW
BOOL CHookApp::InitInstance() :[Ie0[H/M
{ #;"lBqxY`
AFX_MANAGE_STATE(AfxGetStaticModuleState()); zEeix,IU
hins=AfxGetInstanceHandle(); gOaK7A
InitHotkey(); 7re4mrC
return CWinApp::InitInstance(); X0KUnxw
} ;!m_RQPFF
\,`iu=YZv
int CHookApp::ExitInstance() 5%DHF-W)
{ +H!aE}
VerifyWindow(); GU xhn
UnInit(); I#zL-RXT
return CWinApp::ExitInstance(); E7]a#
} (. ,{x)H
[bN_0T.YI
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <H1e+l{8$
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V("T9g
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ N/E=-&E8
#if _MSC_VER > 1000 ]oC7{OoX
#pragma once &2W`dEv]?
#endif // _MSC_VER > 1000 }BCxAwD4
JJP!9<
class CCaptureDlg : public CDialog !,*Uvs@b
{ 2}ywNVS
// Construction L_>LxF43
public: McvLU+
BOOL bTray; iyMoLZ5
BOOL bRegistered; ;i 3C
BOOL RegisterHotkey(); <Oj'0NK-
UCHAR cKey; *(VwD)*
UCHAR cMask; V_)465g
void DeleteIcon(); xf{=~j/L
void AddIcon(); 4{"
v
UINT nCount; C7Hgzc|U
void SaveBmp(); "l6Ob
CCaptureDlg(CWnd* pParent = NULL); // standard constructor COSQ
// Dialog Data Z0Qh7xWve
//{{AFX_DATA(CCaptureDlg) q4u-mM7#7
enum { IDD = IDD_CAPTURE_DIALOG }; c* )PS`]t
CComboBox m_Key; ~@iYP/=/Q
BOOL m_bControl; =Flr05}m
BOOL m_bAlt; m=]}Tn
BOOL m_bShift; *@&V=l
CString m_Path; "6iq_!#L
CString m_Number; A@ w9_qo
//}}AFX_DATA v<?k$ e5
// ClassWizard generated virtual function overrides By0Zz
//{{AFX_VIRTUAL(CCaptureDlg) $tebNiP
public: v1E(K09h2
virtual BOOL PreTranslateMessage(MSG* pMsg); JRw)~Tg @
protected: zZ])G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 46c0;E\9
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?qtL*;
//}}AFX_VIRTUAL BCr*GtR)W
// Implementation 5OC3:%g
protected: SJ:Wr{ Or3
HICON m_hIcon; 0U:9&jP,
// Generated message map functions ^^gV@fz
//{{AFX_MSG(CCaptureDlg) 0ac'<;9]zP
virtual BOOL OnInitDialog(); "=9)|{=m
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @z(s\T
afx_msg void OnPaint(); vslN([@JR
afx_msg HCURSOR OnQueryDragIcon(); iIg99c7/&9
virtual void OnCancel(); ?yvjX90
afx_msg void OnAbout(); cX48?srG
afx_msg void OnBrowse(); Z`@< O%
afx_msg void OnChange(); _ud!:q
//}}AFX_MSG y1Yrf,E
m=
DECLARE_MESSAGE_MAP() Je~<2EsQ
}; +/8KN
#endif Y;q['h
0S>U_#-
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >2<
Jb!f&
#include "stdafx.h" AW`+lE'?
#include "Capture.h" c(!{_+q"
#include "CaptureDlg.h" J<7nOB}OD
#include <windowsx.h> @*~cmf&FIQ
#pragma comment(lib,"hook.lib") &?yVLft
#ifdef _DEBUG WR4 \dsgCU
#define new DEBUG_NEW .cg"M0
#undef THIS_FILE },tn
static char THIS_FILE[] = __FILE__; LgoUD*MbQ
#endif y Ide]
#define IDM_SHELL WM_USER+1 A(qy>x-BI
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &V7{J9
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Twr<MXa
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 2sXX0kq~V
class CAboutDlg : public CDialog ik|iAWy
{ !4!Y~7sI"\
public: P/hIJV[
CAboutDlg(); m=%WA5c?
// Dialog Data %NfbgJcL_
//{{AFX_DATA(CAboutDlg) !l1ycQM
enum { IDD = IDD_ABOUTBOX }; }\)O1
//}}AFX_DATA [|\BuUT'
// ClassWizard generated virtual function overrides "]D2}E>U;
//{{AFX_VIRTUAL(CAboutDlg) *ZA.O
protected: ?W4IAbT\G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I:%O`F
//}}AFX_VIRTUAL -+=+W
// Implementation K~Hp%.
protected: @-Js)zcl q
//{{AFX_MSG(CAboutDlg) m>@ *-*8k
//}}AFX_MSG O&u[^s/^
DECLARE_MESSAGE_MAP() a).bk!G
}; +MP`iuDO
EBPm7{&0|
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hM @F|t3
{ ,V2,FoJ 9
//{{AFX_DATA_INIT(CAboutDlg) r(QjVLjj`k
//}}AFX_DATA_INIT rN%aP-sa<
} SB'$?Kh
}J&[Uc
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N!&$fhY)
{ []rg'9B2b
CDialog::DoDataExchange(pDX); 6P KH%
//{{AFX_DATA_MAP(CAboutDlg) 4RV5:&ALLS
//}}AFX_DATA_MAP o Z#4<7K
} DU/WB
MH,vn</Uw
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @ \(*pa
//{{AFX_MSG_MAP(CAboutDlg) Dk XB
// No message handlers RwC1C(ZP
//}}AFX_MSG_MAP #(G#O1+
END_MESSAGE_MAP() e8"?Qm7 J
GY%48}7
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) G&/RJLX|w
: CDialog(CCaptureDlg::IDD, pParent) l|P(S(ikh
{ vg5;F[e
//{{AFX_DATA_INIT(CCaptureDlg) P}+-))J
m_bControl = FALSE; 8}kY^"*&X
m_bAlt = FALSE; I?mU _^no
m_bShift = FALSE; {]w@s7E
m_Path = _T("c:\\"); tK+K lz
m_Number = _T("0 picture captured."); Ph*tZrd*#
nCount=0; kK[m=rTx1$
bRegistered=FALSE; 8UyYN$7V
bTray=FALSE; LL1HDG>l
//}}AFX_DATA_INIT T>ds<MaLP
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \Q+<G-Kb.
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [9E<z2H
} {$ghf"
C4 &1M
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7VdG6`TDR
{ P+Ta|-
CDialog::DoDataExchange(pDX); (Wu_RXfCw_
//{{AFX_DATA_MAP(CCaptureDlg) Q!<b"8V]
DDX_Control(pDX, IDC_KEY, m_Key); v~N8H+!d
DDX_Check(pDX, IDC_CONTROL, m_bControl); ):lq}6J#
DDX_Check(pDX, IDC_ALT, m_bAlt); ( &U8NeWZ
DDX_Check(pDX, IDC_SHIFT, m_bShift); l`s_#3
DDX_Text(pDX, IDC_PATH, m_Path); k]=Yi;
DDX_Text(pDX, IDC_NUMBER, m_Number); $6a55~h|(
//}}AFX_DATA_MAP SqhG\qE{Qj
} u^T{sQ"_
OJUH".o
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) jc|"wN]
//{{AFX_MSG_MAP(CCaptureDlg) 5!T\L~tyt
ON_WM_SYSCOMMAND() 7Xu.z9y
ON_WM_PAINT() )r#^{{6[v
ON_WM_QUERYDRAGICON() r1= :B'z
ON_BN_CLICKED(ID_ABOUT, OnAbout) ]$'w8<D>t,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T
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ON_BN_CLICKED(ID_CHANGE, OnChange) 4$oX,Q`#
//}}AFX_MSG_MAP 8%s_~Yc
END_MESSAGE_MAP() A3C#wJ
S/?KC^JP
BOOL CCaptureDlg::OnInitDialog() 2V0gj
/&
{ 4|*H0}HOm
CDialog::OnInitDialog(); V3'QA1$
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h-Q3q:
ASSERT(IDM_ABOUTBOX < 0xF000); , wT$L3
CMenu* pSysMenu = GetSystemMenu(FALSE); 4%TY`
II
if (pSysMenu != NULL) ]C =+
{ &xlz80%
CString strAboutMenu; *OT6)]|k
strAboutMenu.LoadString(IDS_ABOUTBOX); YH(
54R
if (!strAboutMenu.IsEmpty())
2L~[dn.s
{ j"aimjqd3
pSysMenu->AppendMenu(MF_SEPARATOR); ei>8{v&g
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h5-<2B|
} tc%?{W\
} *5bKJgwJ
SetIcon(m_hIcon, TRUE); // Set big icon c[4H
SetIcon(m_hIcon, FALSE); // Set small icon !Qu)JR
m_Key.SetCurSel(0); /XG4O
RegisterHotkey(); iD)R*vnAi
CMenu* pMenu=GetSystemMenu(FALSE); ^@'LF
T)
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e'I13)
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); jjgjeY
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w1-/U+0o
return TRUE; // return TRUE unless you set the focus to a control -,t2D/xK
} |@]`" k
}%B^Vl%ZZ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~G!>2 +L
{ L=u>}?!,Fj
if ((nID & 0xFFF0) == IDM_ABOUTBOX) UC)-Fd
{ T&Y?IE}
CAboutDlg dlgAbout; f>Mg.9gJ(
dlgAbout.DoModal(); 51Yq>'8
} 0^VA,QkQ\
else 5+<<:5_6l
{ Zb)j2Xgl
CDialog::OnSysCommand(nID, lParam); XY]|OZ7(
} @<5?q:9.8
} 0s"g%gq|
Nj
Ng=q
void CCaptureDlg::OnPaint() >z*2Og#1
{ ad). X:Qs
if (IsIconic()) kDM\IyM<\
{ v7+f@Z:N*
CPaintDC dc(this); // device context for painting `2S G{5o;
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ALqP;/
// Center icon in client rectangle /F;b<kIy8
int cxIcon = GetSystemMetrics(SM_CXICON); 75j`3wzu
int cyIcon = GetSystemMetrics(SM_CYICON); '"{ IV
CRect rect; _C3l2v'I$
GetClientRect(&rect); __\Tv>Y
int x = (rect.Width() - cxIcon + 1) / 2; Aen)r@Y:
int y = (rect.Height() - cyIcon + 1) / 2; u:r'jb~@
// Draw the icon 1=x4m=wV
dc.DrawIcon(x, y, m_hIcon); iq> PN:mr
} ?:(BkY,K5
else $~xY6"_}!!
{ eJ+V!K'H2
CDialog::OnPaint(); 3+gp_7L
} F.)b`:g
} 6$qn'K$
SqL8MKN)
HCURSOR CCaptureDlg::OnQueryDragIcon()
9K*yds
{ F0O"rN{
return (HCURSOR) m_hIcon; Qo>VN`v
} +;7Rz_.6f
4-@D` ,3L
void CCaptureDlg::OnCancel() Z `FqC
{ 9H~3&-8&
if(bTray) LMchNTL
DeleteIcon(); ZzA4iT=KO
CDialog::OnCancel(); [,s{ /OM
} Gma)8X#
md_9bq/w
void CCaptureDlg::OnAbout() ]2kgG*^n"
{ l][{
#>V
CAboutDlg dlg; ^&iUC&8W
dlg.DoModal(); &D,gKT~
} (,~gY=E+
LFHV~>d
void CCaptureDlg::OnBrowse() ek~bXy{O`
{ XJl2_#
CString str; *rPUVhD_
BROWSEINFO bi; 5a1)`2V2M
char name[MAX_PATH]; wykk</eQ.i
ZeroMemory(&bi,sizeof(BROWSEINFO)); V_JM@VN}Kk
bi.hwndOwner=GetSafeHwnd(); t0XM#9L
bi.pszDisplayName=name; trL:qD+{(
bi.lpszTitle="Select folder"; UTw f!
bi.ulFlags=BIF_RETURNONLYFSDIRS; HMbF#!E
LPITEMIDLIST idl=SHBrowseForFolder(&bi); =}txcA+
if(idl==NULL) juPW!u
return; PDaD:}9
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eIjn~2^
str.ReleaseBuffer(); G"3)\FEM
m_Path=str; o*7`r ~
if(str.GetAt(str.GetLength()-1)!='\\') Zf~Em'g"3
m_Path+="\\"; gR)T(%W
UpdateData(FALSE); YNCQPN\v`1
} fMaUIJ:Q9
j_ dCy
void CCaptureDlg::SaveBmp() HE0UcP1U
{ <$)F_R~T3
CDC dc; zmvF#o
dc.CreateDC("DISPLAY",NULL,NULL,NULL); .Ua|KKK C
CBitmap bm; xh[De}@
int Width=GetSystemMetrics(SM_CXSCREEN); N:Yjz^Jt
int Height=GetSystemMetrics(SM_CYSCREEN); {e4`D1B
bm.CreateCompatibleBitmap(&dc,Width,Height); :4]^PB@dl
CDC tdc; 8 ;oU{
tdc.CreateCompatibleDC(&dc); '1]Iu@?
CBitmap*pOld=tdc.SelectObject(&bm); JiL%1y9|
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); t><AaYij_
tdc.SelectObject(pOld); Id3i qAL
BITMAP btm; J8[N!qDCj
bm.GetBitmap(&btm); )0Av:eF-+
DWORD size=btm.bmWidthBytes*btm.bmHeight; 2Uf]qQ1
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a>jiq8d]4
BITMAPINFOHEADER bih; JAM4
R_
bih.biBitCount=btm.bmBitsPixel; QEIu}e6b
bih.biClrImportant=0; L=W8Q8hf
bih.biClrUsed=0; [5$=G@ zf
bih.biCompression=0; Q C?*O?~#
bih.biHeight=btm.bmHeight; dLQV>oF
bih.biPlanes=1; L1;IXCc=
bih.biSize=sizeof(BITMAPINFOHEADER); 9$F '*{8
bih.biSizeImage=size; A<esMDX
bih.biWidth=btm.bmWidth; Jybx'vZj
bih.biXPelsPerMeter=0; ]i\C4*
bih.biYPelsPerMeter=0; Gz)]1Z{%$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,zmGKn#n2
static int filecount=0; bd],fNgJ
CString name; dZ'hTzw~
name.Format("pict%04d.bmp",filecount++); _&s37A&\
name=m_Path+name; O4xV "\
BITMAPFILEHEADER bfh; `4E6&&E+S
bfh.bfReserved1=bfh.bfReserved2=0; vCE1R]^A.]
bfh.bfType=((WORD)('M'<< 8)|'B'); ~D1.opj3
bfh.bfSize=54+size; Tdvw7I-q
bfh.bfOffBits=54; `[vm{+i
CFile bf; w.kb/
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^M60#gJ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); u\gPx4]4c
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _bp9UJ
bf.WriteHuge(lpData,size); NWCJ|
bf.Close(); Wt2+D{@8
nCount++; }lzUl mRTe
} alM
^
X
GlobalFreePtr(lpData); .s7Cr0^k,|
if(nCount==1) ^|KX)g
m_Number.Format("%d picture captured.",nCount); ?rqU&my S
else bN-ljw0&
m_Number.Format("%d pictures captured.",nCount); I6}ineps
UpdateData(FALSE); p7y8/m\6
} GY9CU=-
A
i`
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bbevy!m
{ {1
fva^O
if(pMsg -> message == WM_KEYDOWN) qH(3Z^ #.|
{ 871taL=
if(pMsg -> wParam == VK_ESCAPE) J{Fu 8
return TRUE; X.V6v4
if(pMsg -> wParam == VK_RETURN) lc%2fVG-e
return TRUE; JGjqBuz#A*
} nRKh|B)
return CDialog::PreTranslateMessage(pMsg); 4?GW]'d
} W|S{v7[l
Cf#[E~2 4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M7rVH\:[-
{ Ic_>[E?k
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (h;4irfX
SaveBmp(); >gNVL
(
return FALSE; `4V_I%lJ&
} $ K>.|\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ph(bgQg
CMenu pop; % j4
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &HdzbKO=
CMenu*pMenu=pop.GetSubMenu(0); Qp9)Rc5
pMenu->SetDefaultItem(ID_EXITICON);
G-?y;V 1
CPoint pt; E;7vGGf]
GetCursorPos(&pt); ]mEY/)~7
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); MpZ
#
if(id==ID_EXITICON) Ra%" +=
DeleteIcon(); l*;Isz:
else if(id==ID_EXIT) V@6,\1#`|
OnCancel(); P9j[
NEV
return FALSE; 8.9TWsZ
} A1`y_
Aj
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0Q]@T@F.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) eq)8V x0
AddIcon(); A|!u`^p
return res; %hcn|-"F
} oZ%rzLH
biZwxP3
void CCaptureDlg::AddIcon() 5(F @KeH>
{ e$krA!zN
NOTIFYICONDATA data; 8sm8L\-
data.cbSize=sizeof(NOTIFYICONDATA); X.)caF^j
CString tip; fh rS7f'Zd
tip.LoadString(IDS_ICONTIP); |q&&"SpA
data.hIcon=GetIcon(0); {%WQQs
data.hWnd=GetSafeHwnd(); y8/
7@qw
strcpy(data.szTip,tip); !F3Y7R
data.uCallbackMessage=IDM_SHELL; tz0_S7h
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q.]>uBAQ?
data.uID=98; y^"[^+F3 .
Shell_NotifyIcon(NIM_ADD,&data); 3R!?r^h
ShowWindow(SW_HIDE); <[9{Lg*D
bTray=TRUE; o' U::
} JWHKa=-H
b65V*Vbj
void CCaptureDlg::DeleteIcon() ZMs$C3
{ $2l<X KT-
NOTIFYICONDATA data; iQry X(z
data.cbSize=sizeof(NOTIFYICONDATA); !KiN} p
data.hWnd=GetSafeHwnd(); l#!p?l
data.uID=98; 5$C4Ui{<E'
Shell_NotifyIcon(NIM_DELETE,&data); BJzNh>-#=
ShowWindow(SW_SHOW); >_9w4g_<
SetForegroundWindow(); [d+f#\ut
ShowWindow(SW_SHOWNORMAL); -*;-T9
bTray=FALSE; *aKT&5Ch-
} g]B!
29M
p
BU,"Yy&
void CCaptureDlg::OnChange() b(<#n6a}\
{ q}vz]L&o
RegisterHotkey(); *Mu X]JK
} >>}4b2U
f|eUpf%)
BOOL CCaptureDlg::RegisterHotkey() sdkKvo.y0
{ ~&bn}
M>W
UpdateData(); FbxrBM
UCHAR mask=0; 3f;W+^NY
UCHAR key=0; <=fYz^|XT
if(m_bControl) w9QY2v,U
mask|=4; nW1Obu8x|
if(m_bAlt) Gn}G$uk61
mask|=2; <pAN{:
if(m_bShift) y7[D9ZvZ
mask|=1; pwq a/Yi
key=Key_Table[m_Key.GetCurSel()]; gmG
M[c \
if(bRegistered){ =pQ'wx|>|
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Uy8r
!9O
bRegistered=FALSE; {FV_APL9_
} ]w2nVC3
cMask=mask; fQZ,kl
cKey=key; yk1.fxik'
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (8bo"{zI
return bRegistered; s zgq7
} ,{{e'S9cy
Yvky=RM
四、小结 *AEN
LQy`,-&
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。