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:
*(>,\8OVf
^+'[:rE 一、实现方法
*~>}* Ub_!~tb}? 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:
?0%3~E`l: d%wy@h #pragma data_seg("shareddata")
bh&Wy<Y HHOOK hHook =NULL; //钩子句柄
8M,AFZ>F UINT nHookCount =0; //挂接的程序数目
:psP|7%| static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
?n0Z4 8% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
l1?$quM^V static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
`{GI^kgJ9 static int KeyCount =0;
^KRe( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
_9<nM48+t #pragma data_seg()
2b i:Q9 l}jC$B`5 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。
yJRqX]MLA 6#SUfK; 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:
E@(nKe&6T_ Jdc{H/10 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
gFQ\zOlY8a cKey,UCHAR cMask)
f}%paE" {
-\dcs? BOOL bAdded=FALSE;
b:6NVHb% for(int index=0;index<MAX_KEY;index++){
f2f2&|7 if(hCallWnd[index]==0){
(.Th?p%>7 hCallWnd[index]=hWnd;
vi1
D< HotKey[index]=cKey;
)oU%++cdo HotKeyMask[index]=cMask;
Wq}Y|0c bAdded=TRUE;
'K7m!y KeyCount++;
9z9\pXFQ break;
&Fg|52 }
bMp[:dw`y }
i]
I{7k return bAdded;
P1u(0t }
5HqvSfq>? //删除热键
!CGpE=V BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z&![W@m@0N {
A6Vb'Gqv{ BOOL bRemoved=FALSE;
S8Ec.]T for(int index=0;index<MAX_KEY;index++){
9(AY7]6 if(hCallWnd[index]==hWnd){
`Hp=1a if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
gmW-#. hCallWnd[index]=NULL;
)kpNg:2p HotKey[index]=0;
s'4%ZE2Dr HotKeyMask[index]=0;
hC
D6 bRemoved=TRUE;
49iqrP' KeyCount--;
qe<xH#6 break;
+
\jn$>E }
RE%25t| }
Q*54!^l+_r }
#i'wDvhol return bRemoved;
vKFEA7 }
"969F(S$ Z(Z$>P&4 >.1d1#+b DLL中的钩子函数如下:
mTU[khEmL= Tf{lH9ca$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
F"| ; {
s^R$u"pFs BOOL bProcessed=FALSE;
LFX[v if(HC_ACTION==nCode)
f!K{f[aDa {
9cXL4 if((lParam&0xc0000000)==0xc0000000){// 有键松开
UpSa7F:Uw switch(wParam)
TR&7AiqB {
'TO/i:{\ case VK_MENU:
9
M90X8 MaskBits&=~ALTBIT;
[U@;EeS break;
-2qI2Z case VK_CONTROL:
Hg04pZupN MaskBits&=~CTRLBIT;
vtw97G break;
ecMpU8}rR case VK_SHIFT:
Ie7S'.Lmq MaskBits&=~SHIFTBIT;
!%/2^ break;
.Mxt
F\ default: //judge the key and send message
49tJ+J- N break;
A)80qx:
}
7TB&Q*Zf for(int index=0;index<MAX_KEY;index++){
2UeK%-~W? if(hCallWnd[index]==NULL)
Xk?Y continue;
XYze*8xUb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
j*_>/gi {
q"-+`;^7(- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
'>:%n bProcessed=TRUE;
kIJ=]wU|v }
_T(77KLn; }
b>@fHmpwD }
ZfU &X{ else if((lParam&0xc000ffff)==1){ //有键按下
_Rk>yJD7s switch(wParam)
vs2xx`Y<Lq {
T?KM}<$(O case VK_MENU:
},%,v2} MaskBits|=ALTBIT;
V( =3K"j break;
$VJE&b case VK_CONTROL:
"\O{!Hj8 MaskBits|=CTRLBIT;
J?/NJ-F break;
6g)X&pZ case VK_SHIFT:
j)mi~i*U MaskBits|=SHIFTBIT;
?OBB)hj break;
rI'kZ0& default: //judge the key and send message
,veo/k<"r8 break;
1[]V @P^ }
$AF,4Ir-b+ for(int index=0;index<MAX_KEY;index++){
iUq{c+h
if(hCallWnd[index]==NULL)
{4B7a6 continue;
')Qb,#/,% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B*^8kc:)L {
e/Y&d9`
I SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
F$HL\y bProcessed=TRUE;
(G 9Ku 8Y }
yPks,7U }
1>)uI@?Rb }
Q(BM0n)f if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
$%zM Z for(int index=0;index<MAX_KEY;index++){
BWLeitS/ if(hCallWnd[index]==NULL)
',s{N9 continue;
6)1xjE# if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.#_g.0< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
uz@lz + //lParam的意义可看MSDN中WM_KEYDOWN部分
4`p[t;q }
vFK!LeF% }
]//Dd/L6 }
oRHWb_$" return CallNextHookEx( hHook, nCode, wParam, lParam );
[(iJj3s! }
jTN!\RH9NF Z9UNp[0 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:
eo<=Q|nI& r1zuc:W1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}qN BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3gz4c1 s^: g.x]x#BC 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:
RQCKH]&! bdyIt)tK+ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
@\Yu?_a {
XB+Juk&d if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Jm3iYR+, {
y2@8? //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
.xg, j{%( SaveBmp();
{3G2-$yb return FALSE;
}O8#4-E_Ji }
o%l|16DR …… //其它处理及默认处理
^w~Utx4 }
;mXw4_{ |\/V1 !z_VwZ#, 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。
PHqIfH [ J-Wphc!m 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。
3ms{gZbw AjMx \'(C 二、编程步骤
xmwH~UWp IfpFsq: 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";
K ZQ
` Hv .C5mo 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
8EAkM*D w ?Q/9aqHe; 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;
0
hS(9y40 Jtl[9qe#] 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;
8\rHSsP Ks.kn7<l 5、 添加代码,编译运行程序。
LYp=o8JW| "hXB_73)V 三、程序代码
'fIirGOl WHvxBd ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
oWdvpvO #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
r^!P=BS{ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ZH=oQV)6 #if _MSC_VER > 1000
28d=-s=[ #pragma once
y%xn(Bn #endif // _MSC_VER > 1000
dS"%( ?o #ifndef __AFXWIN_H__
P[a\Q`}L #error include 'stdafx.h' before including this file for PCH
{9YNv<3 #endif
}~$96|J #include "resource.h" // main symbols
H8?Kgaj~vf class CHookApp : public CWinApp
ccJ!N {
y3pr(w9A public:
16n8[U! CHookApp();
[9xUMX^} // Overrides
EFS2 zU // ClassWizard generated virtual function overrides
^FN(wvqb8 //{{AFX_VIRTUAL(CHookApp)
\F8*HPM=* public:
$K*&Wdo virtual BOOL InitInstance();
tJ@5E^'4 virtual int ExitInstance();
\k)(:[^FY //}}AFX_VIRTUAL
|csR"DOqz //{{AFX_MSG(CHookApp)
mdPEF)- // NOTE - the ClassWizard will add and remove member functions here.
-<.b3M h // DO NOT EDIT what you see in these blocks of generated code !
mqb6 MnK - //}}AFX_MSG
e$y VV# DECLARE_MESSAGE_MAP()
:{KoZd };
{h *Pkn1 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
m@^!?/as BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
VJ$UpqVm BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Ee -yP[2
* BOOL InitHotkey();
PK|"+I0 BOOL UnInit();
d}RR!i`<N #endif
4]3(Vyh` 'hl4cHk14 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
J,j! #include "stdafx.h"
l-RwCw4f #include "hook.h"
G!3d!$t
#include <windowsx.h>
#jNN?,ZK #ifdef _DEBUG
3erGTa[|q #define new DEBUG_NEW
5cE?> #undef THIS_FILE
&
!I$ static char THIS_FILE[] = __FILE__;
5rx;?yvn #endif
sy;_%,}N #define MAX_KEY 100
by8~'? #define CTRLBIT 0x04
oN6X]T<
#define ALTBIT 0x02
01" b9`jU #define SHIFTBIT 0x01
Zjx:1c= b #pragma data_seg("shareddata")
\%+5p"Z< HHOOK hHook =NULL;
vZl]C% UINT nHookCount =0;
qg#|1J6e static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
hIv8A_>@` static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
I,d5Y3mC static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
FOx&'dH%@ static int KeyCount =0;
O$,MdhyXC static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
2RC|u?+@ #pragma data_seg()
8RJ^e[?o( HINSTANCE hins;
2[qlEtvQ void VerifyWindow();
t\%gP@? BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
x[5uz)) //{{AFX_MSG_MAP(CHookApp)
yq2pg8% // NOTE - the ClassWizard will add and remove mapping macros here.
kL1StF#p // DO NOT EDIT what you see in these blocks of generated code!
v8!Ts" //}}AFX_MSG_MAP
Wy`ve~y END_MESSAGE_MAP()
:AM5EO
BHa'`lCb CHookApp::CHookApp()
V O=
o)H\ {
rr=e // TODO: add construction code here,
pZg}7F{$ // Place all significant initialization in InitInstance
nD51,1> }
UfWn\*J&k 08TeGUjJ CHookApp theApp;
yMoV|U6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
P 4|p[V8 {
wjeuZNYf BOOL bProcessed=FALSE;
O W|5IEC if(HC_ACTION==nCode)
da/Tms`T {
chF@',9t if((lParam&0xc0000000)==0xc0000000){// Key up
.sOEqwO}> switch(wParam)
?]]d
s] {
)IH|S5mG? case VK_MENU:
C>:'@o
Z MaskBits&=~ALTBIT;
b,Vg3BS break;
}[gk9uM_7 case VK_CONTROL:
ecRY,MN MaskBits&=~CTRLBIT;
Ghb Jty` break;
J>XMaI})U case VK_SHIFT:
d^sm;f MaskBits&=~SHIFTBIT;
P@wu k1 break;
*lT: P- default: //judge the key and send message
}; ;Thfd break;
g VPtd[r }
:_f5(N*{5o for(int index=0;index<MAX_KEY;index++){
Y 3 QrD&V if(hCallWnd[index]==NULL)
2aR<xcSg continue;
c?0.>^,B Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6SGV}dAx {
(:P-ef$]C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
C@3`n;yZ= bProcessed=TRUE;
F?B`rw@xr }
Qmg2lP.) }
1\aJ[t }
BHZCM^ else if((lParam&0xc000ffff)==1){ //Key down
zY=eeG+4s switch(wParam)
vk&6L%_~a {
^I CSs]}1 case VK_MENU:
Y%1 94fY$ MaskBits|=ALTBIT;
-0>gq$/N=^ break;
+338z<'Z! case VK_CONTROL:
}@XokRk MaskBits|=CTRLBIT;
JE<w7:R& break;
Sbp].3^j case VK_SHIFT:
UqwU3 MaskBits|=SHIFTBIT;
CVy\']
break;
nde_%d$ default: //judge the key and send message
.*Mp+Q}^ break;
_/>JM0 }
6B=: P3Y for(int index=0;index<MAX_KEY;index++)
h7"c_=w+ {
-/'_XR@1 if(hCallWnd[index]==NULL)
p"UdD continue;
L<62-+e` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o<8('j
{
l3O!{&~K SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<1%(%KdN[ bProcessed=TRUE;
Z.l4< }
S<Os\/* }
f)x(sk }
x,% %^( if(!bProcessed){
a7@':Rb n for(int index=0;index<MAX_KEY;index++){
R ~ZcTY[8 if(hCallWnd[index]==NULL)
("r\3Mvs continue;
.V
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:2zga=)g SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
BH"OphE }
h%%ryQQ&< }
y9)w(y! }
pv[Gg^ return CallNextHookEx( hHook, nCode, wParam, lParam );
!Soz??~o/ }
je`Ysbe n JJZu%9~[ BOOL InitHotkey()
>2t.7UhDI {
d2a*xDkv if(hHook!=NULL){
ki6Lt nHookCount++;
YEPQ/Pc return TRUE;
zo|
' }
-k8<LR3 else
|ns
B'Q hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,`
64t'g if(hHook!=NULL)
T@%\?=P nHookCount++;
?yc{@| return (hHook!=NULL);
v6M4KC2? }
-^aJ}[uaI BOOL UnInit()
[o"<DP6w {
?:$\
t?e^ if(nHookCount>1){
, UsY0YC nHookCount--;
i$5<>\g return TRUE;
OU
esL9 }
{ MV,>T_ BOOL unhooked = UnhookWindowsHookEx(hHook);
?Qxf~,F if(unhooked==TRUE){
FMi:2.E nHookCount=0;
HSk_'g(\0 hHook=NULL;
x fa- }
4`GOBX1b.y return unhooked;
~NMx:PP }
)GYnQoV4 @ tvz9N BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
g&*,j+$ } {
awv$ }EFo BOOL bAdded=FALSE;
`FGYc for(int index=0;index<MAX_KEY;index++){
{sfA$ d0 if(hCallWnd[index]==0){
@PT([1C hCallWnd[index]=hWnd;
ZuFcJ?8i HotKey[index]=cKey;
Vak\N)=u HotKeyMask[index]=cMask;
8<)ZpB,7 bAdded=TRUE;
RY
.@_{ KeyCount++;
.He}f,!f< break;
^6On^k[|fw }
F)Iz: }
@C|nc&E2s return bAdded;
ObfRwZh?q }
w^"IR v YJ9G"E BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;_=N
YG. {
PU,%Y_xR BOOL bRemoved=FALSE;
1Q/=s,{u for(int index=0;index<MAX_KEY;index++){
Kh$Q9$ if(hCallWnd[index]==hWnd){
E<l/o5<nC if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
3=Q:{ hCallWnd[index]=NULL;
=%B5TBG HotKey[index]=0;
6_s(Kx>j HotKeyMask[index]=0;
|M&4[ka} bRemoved=TRUE;
eaC%&k KeyCount--;
#;yxn.</ break;
`*l aUn }
H$+@O- }
,$} xPC }
uGv|!UQw return bRemoved;
{Q}F.0Q }
L>h|1ZK _U_O0@xi void VerifyWindow()
!Ii[`H {
hvG D` for(int i=0;i<MAX_KEY;i++){
)n]"~I^ if(hCallWnd
!=NULL){ o1vK2V
if(!IsWindow(hCallWnd)){ 5Xf]j=_
hCallWnd=NULL; q;}iW:r&Q
HotKey=0; Ptc+ypTu
HotKeyMask=0; -&COI-P8
KeyCount--; XEnu0gr
} %q}[ZD/HD
} /w1M%10
} E.Q]X]q
} |AH>EXhv
:KgH7s}
BOOL CHookApp::InitInstance() DXo]O}VF
{ =?c""~7
AFX_MANAGE_STATE(AfxGetStaticModuleState()); hrm<!uKn
hins=AfxGetInstanceHandle(); au04F]-|j8
InitHotkey(); |r*)U(c`
return CWinApp::InitInstance(); ae2Q^yLA
} lYTQg~aPm
X$;&Mdo.
int CHookApp::ExitInstance() |his8\C+x
{ N+ak{3
VerifyWindow(); 8qqN0"{,
UnInit();
vTgx7gP
return CWinApp::ExitInstance(); x_/}R3d
} n1JtY75#,/
XC5/$3'M&
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AN:yL
a!
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J\Hv42
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *i}X(sfe
#if _MSC_VER > 1000 .L+XV y
#pragma once (-g*U#
#endif // _MSC_VER > 1000 Z6rhInIY
MoE&)~0u&
class CCaptureDlg : public CDialog tEL9hZzI
{ veHe
// Construction w`;HwK$ ,
public: fz\Q>u'T
BOOL bTray; UXlZI'|He
BOOL bRegistered; puJB&u"4L
BOOL RegisterHotkey(); >v %js!`f
UCHAR cKey; HeO:=OE~>
UCHAR cMask; kDE-GX"Y
void DeleteIcon(); ~\mh\a&
void AddIcon(); i1|>JM[V
UINT nCount; At"$Cu!k
void SaveBmp(); HT6 [Z1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor #n'.a1R
// Dialog Data
v&|65[<
//{{AFX_DATA(CCaptureDlg) qx'0(q2Ii(
enum { IDD = IDD_CAPTURE_DIALOG }; c7jmzo
CComboBox m_Key; >;^/B R=
BOOL m_bControl; $8)XN-%(
BOOL m_bAlt; P&uSh?[ ^
BOOL m_bShift; )-26(aNGT
CString m_Path; 7IkPi?&{
CString m_Number; 2}A)5P*K
//}}AFX_DATA HMCLJ/
// ClassWizard generated virtual function overrides =w!ik9
//{{AFX_VIRTUAL(CCaptureDlg) ~x^y5[5{
public: Wk<fNHg
virtual BOOL PreTranslateMessage(MSG* pMsg); u0h%4f!X
protected: Td'Mc-/
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~<?Zj
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); TIKkS*$
//}}AFX_VIRTUAL *3H=t$1G}
// Implementation _Xt/U>N
protected: g#=<;X2
HICON m_hIcon; >I|8yqbfm
// Generated message map functions st;iGg
//{{AFX_MSG(CCaptureDlg) b2OwLt9
virtual BOOL OnInitDialog(); b)<WC$"
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (T_-`N|
afx_msg void OnPaint(); hO]F\0+
afx_msg HCURSOR OnQueryDragIcon(); b3^:Bh9
virtual void OnCancel();
yf:Vhr
afx_msg void OnAbout(); /[<F
f
afx_msg void OnBrowse(); 2ZY$/
afx_msg void OnChange(); &em~+83
//}}AFX_MSG W;Y^(f
DECLARE_MESSAGE_MAP() M
bWby'
}; T82 `-bZ
#endif :QGkYJ
oFj_o
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^e8xg=8(
#include "stdafx.h" -K 'UXoU1
#include "Capture.h" UZI:st
#include "CaptureDlg.h" o]q~sJVk6
#include <windowsx.h> u]Ku96!
#pragma comment(lib,"hook.lib")
6sBt6?_T
#ifdef _DEBUG m ol,iM*l
#define new DEBUG_NEW zr/v .$<
#undef THIS_FILE A?H#bRAs
static char THIS_FILE[] = __FILE__; Hu"$)V
#endif 509T?\r
#define IDM_SHELL WM_USER+1 ]SCHni_
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^eh.Iml'@
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7GOBb|
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -G.N
class CAboutDlg : public CDialog m$p}cok#+S
{ rLsY_7!
public: .; F<X\_
CAboutDlg(); e Ucbe33
// Dialog Data FJc8g6M
//{{AFX_DATA(CAboutDlg) 7|5kak>=
enum { IDD = IDD_ABOUTBOX }; @3.Z>KONx
//}}AFX_DATA uge r:cD
// ClassWizard generated virtual function overrides 9\4x<*
//{{AFX_VIRTUAL(CAboutDlg) 0]4X/u#N
protected: Wx:v~/r
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I=kqkuW
//}}AFX_VIRTUAL O>' }q/
// Implementation .;4N:*hY
protected: !|Q&4NS
//{{AFX_MSG(CAboutDlg) ,<U=
7<NU
//}}AFX_MSG ] 0X|_bU
DECLARE_MESSAGE_MAP() @P7'MiP]K
}; gD9CA*
-TF},V~
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l zFiZx
{ WqA)V,E
//{{AFX_DATA_INIT(CAboutDlg) K,g6y#1"
//}}AFX_DATA_INIT M{J>yN
} 6TW<,SM
]`$6=)_X
void CAboutDlg::DoDataExchange(CDataExchange* pDX) IU8zidn&
{ cb^IJA9}
CDialog::DoDataExchange(pDX); $VmV>NZ
//{{AFX_DATA_MAP(CAboutDlg) e3ZRL91c
//}}AFX_DATA_MAP F_qApyU,7
} rr
tMd
|HycBTN#E
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OkciL]
//{{AFX_MSG_MAP(CAboutDlg) %unn{92)
// No message handlers lwQ!sH[M
//}}AFX_MSG_MAP zDdo RK@
END_MESSAGE_MAP() t{]
6GlW
d~aTjf
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ArtY;.cg%
: CDialog(CCaptureDlg::IDD, pParent) 0eA<nK
{ 4mDHAR%D
//{{AFX_DATA_INIT(CCaptureDlg) `j{3|C=
m_bControl = FALSE; 16AlmegDk
m_bAlt = FALSE; >
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m_bShift = FALSE; HIc;Lc8$
m_Path = _T("c:\\"); Z;uKnJh
m_Number = _T("0 picture captured."); zeMV_rW~
nCount=0; @ym:@<D
bRegistered=FALSE; c +]r
bTray=FALSE; I0F[Z\U
//}}AFX_DATA_INIT ~T@E")uR
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Yb5U^OjyJ
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e8`d<U
} x<l 5wh
WfO E I1
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z -?\b^
{ ^VYR}1Mw
CDialog::DoDataExchange(pDX); cIO/8D#zU
//{{AFX_DATA_MAP(CCaptureDlg) }@bp v
DDX_Control(pDX, IDC_KEY, m_Key); "Erphn
DDX_Check(pDX, IDC_CONTROL, m_bControl); NuO@Nr
DDX_Check(pDX, IDC_ALT, m_bAlt); DNmC
DDX_Check(pDX, IDC_SHIFT, m_bShift); \Q#pu;Y*N]
DDX_Text(pDX, IDC_PATH, m_Path); ^6l5@#)w
DDX_Text(pDX, IDC_NUMBER, m_Number); usc/DQ1
//}}AFX_DATA_MAP Z2W&_(^.h
} l iY/BkpH
@g[ijs\
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ov(k:"N
//{{AFX_MSG_MAP(CCaptureDlg) Xn"#Zy_
ON_WM_SYSCOMMAND() #bd=G(o~6
ON_WM_PAINT() Jj]<SWh
ON_WM_QUERYDRAGICON() l3u [
ON_BN_CLICKED(ID_ABOUT, OnAbout) '{,JuX"n
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) H2],auBY
ON_BN_CLICKED(ID_CHANGE, OnChange) `m'RvU c
//}}AFX_MSG_MAP QHv]7&^rlj
END_MESSAGE_MAP() qg j;E=7
Z%?>H iy'o
BOOL CCaptureDlg::OnInitDialog() GNW$:=0u
{ :30daKo
CDialog::OnInitDialog(); w8+phN(-M
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d*u3]&?x&f
ASSERT(IDM_ABOUTBOX < 0xF000); %;wDB2k*
CMenu* pSysMenu = GetSystemMenu(FALSE); z/j*zU
`
if (pSysMenu != NULL) /*g0M2+OZo
{ `V/kM0A5
CString strAboutMenu; x<t?Yc9
strAboutMenu.LoadString(IDS_ABOUTBOX); 67/@J)z0%
if (!strAboutMenu.IsEmpty()) pp|$y\ZzB
{ 6U).vg<
pSysMenu->AppendMenu(MF_SEPARATOR); MZ)lNU l
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R UCUEo63
} =?CIC%6m
} .P8m%$'N
SetIcon(m_hIcon, TRUE); // Set big icon k'X"jon
SetIcon(m_hIcon, FALSE); // Set small icon Oh}52=
m_Key.SetCurSel(0); T pCXe\W
RegisterHotkey(); vmxS^_I
CMenu* pMenu=GetSystemMenu(FALSE); $m)eO8S+
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qW3XA$g|j'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +^J&x>5
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `_D A!
return TRUE; // return TRUE unless you set the focus to a control \HD:#a
} 6oWFj eZ0
|s#,^SJ0
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) t^bh2$J
{ 2L<1]:I
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,wr5DQ
{ ZHRMW'Ne
CAboutDlg dlgAbout; 3Q&@l49q
dlgAbout.DoModal(); Bz{"K
} /?>W\bP<
else )3F}IgD
{ U7LCd+Z5X
CDialog::OnSysCommand(nID, lParam); G=e'H-
} "Ml#,kU<T
} ,H|K3nh
dR s\e(H'
void CCaptureDlg::OnPaint() #- L <
{ Yi-,Pb?
if (IsIconic()) {DVMs|5;^
{ uEsF 8
CPaintDC dc(this); // device context for painting 6Po{tKU
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); asW
W@E
// Center icon in client rectangle {#t7lV'4
int cxIcon = GetSystemMetrics(SM_CXICON); t.!?"kP"c
int cyIcon = GetSystemMetrics(SM_CYICON); c*w0Jz>@.7
CRect rect; Nn0j}ZI)1
GetClientRect(&rect); s_Z5M2o
int x = (rect.Width() - cxIcon + 1) / 2; 1q
ZnyJ
int y = (rect.Height() - cyIcon + 1) / 2; 6d5q<C_3t
// Draw the icon iOAn/[^xk
dc.DrawIcon(x, y, m_hIcon); 3? k<e
} zl, Vj%d
else 1Uah IePf
{ 6XAofN/5f
CDialog::OnPaint(); !;t6\Z8&
} X&Ospl@H
} <UIE-#
>y!R}`&0^t
HCURSOR CCaptureDlg::OnQueryDragIcon() >TGc0 z+
{ )eX{a/Be
return (HCURSOR) m_hIcon; xxgdp. (
} N5MWMN[6aP
29z@ !
void CCaptureDlg::OnCancel() XB[EJGaX
{ B$q5/ L$}
if(bTray) xyV7MW\?w
DeleteIcon(); xNJ*TA[+
CDialog::OnCancel(); nh+h3"-d
} Ix@nRc'
Dz$dJF1
8
void CCaptureDlg::OnAbout() "-HWw?rx/
{ {p$X*2ReB
CAboutDlg dlg; g/!tp;e
dlg.DoModal(); z2A,*|I
} dM -<aq
NwKj@ Jos
void CCaptureDlg::OnBrowse() &`g^b^i
{ H-%
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CString str; WxJaE;`Ige
BROWSEINFO bi; L 'e|D=y
char name[MAX_PATH]; Lq#!}QcW=
ZeroMemory(&bi,sizeof(BROWSEINFO)); R<r,&X?m
bi.hwndOwner=GetSafeHwnd(); !%D;H ~mQ
bi.pszDisplayName=name; $m-@ICG#
bi.lpszTitle="Select folder"; 6,l5Q
bi.ulFlags=BIF_RETURNONLYFSDIRS; +}g6X6m
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Nc^:v/(P
if(idl==NULL) }+:X= @Z@
return; 7Zft]C?|@
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @6y)wA9Yx
str.ReleaseBuffer(); x45F-w{
m_Path=str; wF-H{C'
if(str.GetAt(str.GetLength()-1)!='\\') H:q;IYE+a
m_Path+="\\"; 5z.Y}
UpdateData(FALSE); UD&pL'{s
} ]~pM;6Pu0
5IRUG)Icr
void CCaptureDlg::SaveBmp() w,1*dn
{ XCGK&OGI
CDC dc; 0Fs2* FS
dc.CreateDC("DISPLAY",NULL,NULL,NULL); "JgwL_2
CBitmap bm; r+a0.
int Width=GetSystemMetrics(SM_CXSCREEN); |QyZ:`0u
int Height=GetSystemMetrics(SM_CYSCREEN); (Kw%fJT
bm.CreateCompatibleBitmap(&dc,Width,Height); {P ==6/<2o
CDC tdc; -^>7\]
tdc.CreateCompatibleDC(&dc); _!yUr5&,Br
CBitmap*pOld=tdc.SelectObject(&bm); U_wIx
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rwpH9\GE
tdc.SelectObject(pOld); :?gp}.
BITMAP btm; t&o&gb
bm.GetBitmap(&btm); %y+v0.aWH+
DWORD size=btm.bmWidthBytes*btm.bmHeight; bc6|]kB:
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &'m&'wDt:
BITMAPINFOHEADER bih; \XbCJJP
bih.biBitCount=btm.bmBitsPixel; }?6gj%$c
bih.biClrImportant=0; m-9ChF:U
bih.biClrUsed=0; m>DJ w7<
bih.biCompression=0; SS&G<3Ke
bih.biHeight=btm.bmHeight; @f#6Nu
bih.biPlanes=1; k4JTc2b
bih.biSize=sizeof(BITMAPINFOHEADER); fTGVG
bih.biSizeImage=size; .p78
\T
bih.biWidth=btm.bmWidth; Hr(%y&0
bih.biXPelsPerMeter=0; Dyj>dh-
bih.biYPelsPerMeter=0; +@+*sVb
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O}z-g&e.U
static int filecount=0; AZ.
j>+0xx
CString name; F{eI[A
name.Format("pict%04d.bmp",filecount++); VP }To
name=m_Path+name; A ?[Wfq|
BITMAPFILEHEADER bfh; [n$6T
bfh.bfReserved1=bfh.bfReserved2=0; &3 x
[0DV
bfh.bfType=((WORD)('M'<< 8)|'B'); K*tomy
bfh.bfSize=54+size; xE6hE'rh.O
bfh.bfOffBits=54; *3(mNpi{_
CFile bf; T?*f}J
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5~RR
_G
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); xQxq33\
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mfk^t`w_
bf.WriteHuge(lpData,size); 3oApazH*
bf.Close(); V+$fh2t
nCount++; ._6Q "JAB
} nCLEAe$W\=
GlobalFreePtr(lpData); =AX"'q
if(nCount==1) j^m pkv<P
m_Number.Format("%d picture captured.",nCount); \|
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else D0X!j,Kc
m_Number.Format("%d pictures captured.",nCount); +o K*5 Y
UpdateData(FALSE); 55zy]|F"
} ? RID4xu!
Ime"}*9
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) PebyH"M(
{ ~Vf
A
if(pMsg -> message == WM_KEYDOWN) wu0q.]
{ a6 "-,Kg
if(pMsg -> wParam == VK_ESCAPE) $v1_M1
return TRUE; H
;)B5C
if(pMsg -> wParam == VK_RETURN) zCmx 1Djz
return TRUE; ^K:-r !v^
} ,-SWrp`f
return CDialog::PreTranslateMessage(pMsg); |+Tq[5&R
} ?:i,%]zxC
lPg?Fk7AP
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -o@L"C>
{ CrYPcvd6
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?DKY;:dZF
SaveBmp(); xks Me
return FALSE; 2k^'}7G%
} {vp*m:K
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [G"Va_A8
CMenu pop; 5Rae?*XH
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yVyh\u\
CMenu*pMenu=pop.GetSubMenu(0); pL,l
pMenu->SetDefaultItem(ID_EXITICON); yKC1h`2
CPoint pt; 1H8/b D
GetCursorPos(&pt); [=^Wj`;
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Yb%#\.M/y
if(id==ID_EXITICON) vU9:`@beu
DeleteIcon(); L fZF
else if(id==ID_EXIT) ;]W@W1)$
OnCancel(); pz]!T'
return FALSE; EvF[h:C2
} @iN"]GFjS
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +.QJZo_
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N{uVh;_
AddIcon(); plM:7#eA
return res; ,OFNV|S$
} yV*4|EkvW
m"wP]OQH*+
void CCaptureDlg::AddIcon() 5 &0qr$
{ .Gb!mG
NOTIFYICONDATA data; Y;kiU
data.cbSize=sizeof(NOTIFYICONDATA); Yw_!40`
CString tip; ZWQ/BgKB
tip.LoadString(IDS_ICONTIP); E[<*Al+N
data.hIcon=GetIcon(0); l_Zx'm
data.hWnd=GetSafeHwnd(); ^ U~QQ
strcpy(data.szTip,tip); gmZ] E45
data.uCallbackMessage=IDM_SHELL; k`J|]99Wb
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6i@* L\
Dl
data.uID=98; kq@~QI?9
Shell_NotifyIcon(NIM_ADD,&data); /dHIm`. Z
ShowWindow(SW_HIDE); }
g%v<'K
bTray=TRUE; <T]ey
} pk0{*Z?@
^%!#Q].
void CCaptureDlg::DeleteIcon() y2=yh30L0E
{ G"h}6Za;DO
NOTIFYICONDATA data; WWATG=
data.cbSize=sizeof(NOTIFYICONDATA); #\\|:`YV
data.hWnd=GetSafeHwnd(); L[!||5y
data.uID=98; .AZwVP<
Shell_NotifyIcon(NIM_DELETE,&data); gj
I>tz}
ShowWindow(SW_SHOW); n/S+0uT
SetForegroundWindow(); 8#/y`ul
ShowWindow(SW_SHOWNORMAL); G=|~SYz
bTray=FALSE; oXUb_/
} L+}<gQJ(
13+.>
void CCaptureDlg::OnChange() ^!gq_x
{ fElFyOo+
RegisterHotkey(); /i#";~sO
} 2+ywl}9
?hViOh$.
BOOL CCaptureDlg::RegisterHotkey() [v`kqL~
{ :aH5=@[!y
UpdateData(); gFsqCx<q
UCHAR mask=0; Eihn%Esa
UCHAR key=0; KD?b|y@
if(m_bControl) <T&v\DN
mask|=4; '.&Y)A6!
if(m_bAlt) D}Sww5ZmP
mask|=2; /Q_Dd
if(m_bShift) <. *bJ
mask|=1; u08QE,
key=Key_Table[m_Key.GetCurSel()]; h J0U-m
if(bRegistered){ $tej~xZK
DeleteHotkey(GetSafeHwnd(),cKey,cMask); %r8;i
bRegistered=FALSE; g/VV2^,
} YrV@k*O*
cMask=mask; d</F6aM\
cKey=key; nv\K!wZI=b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Qqs1%u;e8
return bRegistered; pTXF^:8
} A0:rn\$l3
W#=,FZT
四、小结 W1EYVXN
N1B$z3E*
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。