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:
8ag!K*\V<
+@UV?"d 一、实现方法
?dTD\)%A xdPx{"C
3 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:
Jm@oDME_E 'u658Tj #pragma data_seg("shareddata")
y_,bu^+* HHOOK hHook =NULL; //钩子句柄
Ri'n UINT nHookCount =0; //挂接的程序数目
4-w{BZuS static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
DG/Pb)%Y
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
KvSG; static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
gw(z1L5
n static int KeyCount =0;
{g6%(X\r.r static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
al0L&z\ #pragma data_seg()
}Z>)DN=+ ~&O%N 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。
pAEx#ck *hrd5na 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:
iso4]>LF rQX zR BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
& kIFcd@ cKey,UCHAR cMask)
'qi}|I {
G3]4A&h9v~ BOOL bAdded=FALSE;
E^PB)D(. for(int index=0;index<MAX_KEY;index++){
a.'*G6~Qgw if(hCallWnd[index]==0){
GILfbNcd hCallWnd[index]=hWnd;
3T
9j@N77 HotKey[index]=cKey;
l6B@qYLZ HotKeyMask[index]=cMask;
)"LJ
hLg bAdded=TRUE;
@x1-!
~z# KeyCount++;
j pOp. break;
=;k|*Ny }
]Dzlp7Y} }
b-y return bAdded;
wBzC5T%, }
AGno6g //删除热键
iE{&*.q_}> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
B *vM0 {
hph4 `{T BOOL bRemoved=FALSE;
Al'3? for(int index=0;index<MAX_KEY;index++){
pp2~Meg if(hCallWnd[index]==hWnd){
S'14hk< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
m*;ERK hCallWnd[index]=NULL;
"L1Zi.) HotKey[index]=0;
zQA`/&=Y HotKeyMask[index]=0;
zL it bRemoved=TRUE;
-8Xf0_ KeyCount--;
9l,oP? break;
y]imZ4{/ }
N7_"H>O$0U }
VX/#1StC }
r/sNrB1U"y return bRemoved;
f5k6`7Vj] }
KG@8RtHsQ mTh]PPo 7|D +Ihy; DLL中的钩子函数如下:
/> Nt[o[r fV:83|eQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{T8Kk)L {
8_tQa^.n\ BOOL bProcessed=FALSE;
nie% eC&U if(HC_ACTION==nCode)
K>9 ()XT) {
f-d1KNY if((lParam&0xc0000000)==0xc0000000){// 有键松开
B:QHwzd switch(wParam)
i&k7-< {
\f)#>+X- case VK_MENU:
9akH MaskBits&=~ALTBIT;
rbQR,Nf2x break;
4~=l}H>& case VK_CONTROL:
fQ98(+6 MaskBits&=~CTRLBIT;
0Qd:`HF[ break;
T Ge_G_'o case VK_SHIFT:
_rYkis^u MaskBits&=~SHIFTBIT;
V$~9]*Wn break;
y?0nI<}}HK default: //judge the key and send message
/@Zrq#o
zx break;
Df#l8YK# }
6^Sa; for(int index=0;index<MAX_KEY;index++){
\Roz$t-R|f if(hCallWnd[index]==NULL)
ZB&6<uw continue;
T)})
pt!V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
p:%loDk {
j7c3(*Pl SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
=2 kG%9 bProcessed=TRUE;
qFNes)_r }
s@DLt+ O5 }
;>YzEo }
]_f<kW\1* else if((lParam&0xc000ffff)==1){ //有键按下
6&-(&(_ switch(wParam)
*#Wdc O`- {
bTu9;( case VK_MENU:
km40qO@3 MaskBits|=ALTBIT;
Q&V;(L62! break;
A9JdU& case VK_CONTROL:
'7@R7w!E4H MaskBits|=CTRLBIT;
AK#1]i~ break;
MWL%
Bz case VK_SHIFT:
_~
&iq1 MaskBits|=SHIFTBIT;
hL5|69E break;
[mHdG2X default: //judge the key and send message
)/EO&F break;
][] }
""D 4s for(int index=0;index<MAX_KEY;index++){
WT}H>T if(hCallWnd[index]==NULL)
ukY"+& continue;
/SrAW`;" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-tNUMi' {
t_suF$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ujucZ9}yd bProcessed=TRUE;
+'@Dz9:> }
9k~8 }
l0hlM# }
-R6)ROGl if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
xRsWI!d+| for(int index=0;index<MAX_KEY;index++){
'Qo*y%{@5 if(hCallWnd[index]==NULL)
h65-s continue;
Ib0ZjX6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
EU/8=JA1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
X~i<g?] //lParam的意义可看MSDN中WM_KEYDOWN部分
2wgg7[tGi }
pXK^Y'2C! }
0<B$#8 }
TNr :pE< return CallNextHookEx( hHook, nCode, wParam, lParam );
$lut[o74 }
:#~j:C| PJ'E/C)i 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
*
+wW(#[ !&Pui{F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
PAOJ\U BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Q?/o%`N ivz5H(b 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
o7LuKRl
.k
\@zQ|Ta LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Y7[jqb1D {
FjI`uP if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
4X(H; {
19KQlMO.G //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
iRi-cQVy SaveBmp();
P_p<`sC9 return FALSE;
9pxc~= }
)Iq <+IJ …… //其它处理及默认处理
XNu^`Ha }
H1(Uw:V8 `%Al>u5
U2~kJ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
r_;Nt m<qJcZk 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
O|N{v"o M_w<m 二、编程步骤
VEw" 3J438M.ka 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
1s@+;QUib Wh2tNyS 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
c#tjp(- }t1a*z 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
SrK<fAkx fCobzDy
4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
3%;a)c;D %zw1}|s#z 5、 添加代码,编译运行程序。
:e%Pvk M*HnM( 三、程序代码
@\P;W(m.i c+nq] xOs' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
6,9>g0y'NG #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
8rS:5:Hi #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
dIBE!4 V[ #if _MSC_VER > 1000
EJ:%}HhA #pragma once
Yv!a88+A8M #endif // _MSC_VER > 1000
TNh1hhJ$b #ifndef __AFXWIN_H__
V0XvJ
#error include 'stdafx.h' before including this file for PCH
*m,k(/> #endif
YLE!m? #include "resource.h" // main symbols
!|S43i&p class CHookApp : public CWinApp
I\JGs@I {
'>ssqBnI public:
Z//+Gw<' CHookApp();
rOOT8nkR# // Overrides
r_6ZO& // ClassWizard generated virtual function overrides
6@0OQb //{{AFX_VIRTUAL(CHookApp)
> eIP.,9 public:
%pd ,%pg virtual BOOL InitInstance();
&&:YVd
virtual int ExitInstance();
QTXt8I //}}AFX_VIRTUAL
:Ab%g- //{{AFX_MSG(CHookApp)
DOJ N2{IP // NOTE - the ClassWizard will add and remove member functions here.
9!}8UALD // DO NOT EDIT what you see in these blocks of generated code !
B%76rEpvW; //}}AFX_MSG
PFne+T!2F DECLARE_MESSAGE_MAP()
#(JNn'fzq };
H>B&|BO_[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
AKyUfAj3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,+xB$e BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
5}]"OXQ BOOL InitHotkey();
[^e%@TV>d BOOL UnInit();
u5: q$P #endif
/+;h)3PN6 v`zJb00DT //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
+M$Q
=6/ #include "stdafx.h"
LNpup`>` #include "hook.h"
~SF<,-Kg #include <windowsx.h>
@u]rWVy;\[ #ifdef _DEBUG
P} SCF #define new DEBUG_NEW
ua]o6GlO #undef THIS_FILE
iIa'2+ static char THIS_FILE[] = __FILE__;
TQ*1L:X7M& #endif
'~&X wZ& #define MAX_KEY 100
2Mmz %S'd #define CTRLBIT 0x04
bc)~k: #define ALTBIT 0x02
cKim- #define SHIFTBIT 0x01
U4-g^S[ #pragma data_seg("shareddata")
~ZEmULKkR HHOOK hHook =NULL;
RBm ;e0 UINT nHookCount =0;
J)~L static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
_:C9{aEZb static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
db6b-Y{ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
5b[jRj6 static int KeyCount =0;
$[&*Bj11Yg static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
PuT@}tw #pragma data_seg()
]<pjXVRt" HINSTANCE hins;
&<J[Q%2 void VerifyWindow();
T'&I{L33Y BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
/8g^T") //{{AFX_MSG_MAP(CHookApp)
fhp<oe>D // NOTE - the ClassWizard will add and remove mapping macros here.
muZ~*kMc // DO NOT EDIT what you see in these blocks of generated code!
5sJJGv#6 //}}AFX_MSG_MAP
(?{MEwHG END_MESSAGE_MAP()
;YX4:OBqr ez^@NK CHookApp::CHookApp()
yo)%J {
qX
// TODO: add construction code here,
f[~L?B;_L // Place all significant initialization in InitInstance
1ilBz9x*! }
"zFNg'; QxOjOKAG
CHookApp theApp;
%r6y
;vAf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
*B{j.{
p( {
[tA;l+Q\& BOOL bProcessed=FALSE;
fCtPu08{Z if(HC_ACTION==nCode)
~UjGSO)z} {
";Rtiiu if((lParam&0xc0000000)==0xc0000000){// Key up
fKeT~z{~ switch(wParam)
Kt|1&Gk {
ct,l^|0Hu8 case VK_MENU:
i35=Y~P- MaskBits&=~ALTBIT;
+g]yA3 break;
'-b*EZU8t case VK_CONTROL:
`zXO_@C MaskBits&=~CTRLBIT;
Y=n4K< break;
a5!Fv54 case VK_SHIFT:
m"jV}@agX MaskBits&=~SHIFTBIT;
E7)=`kSl break;
P(73!DT+ default: //judge the key and send message
<_Q:'cx' break;
HcV"X,7S }
7=OQ8IM! for(int index=0;index<MAX_KEY;index++){
"=za??\K} if(hCallWnd[index]==NULL)
>Ll$p0W continue;
| j a- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jSuL5|Gui {
>P $;79< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2hQ>: bProcessed=TRUE;
z,:a8LB#[ }
[.*;6y3 }
T%n2$ }
\$OF1i@ else if((lParam&0xc000ffff)==1){ //Key down
L%c0 Z@[~ switch(wParam)
0#*#a13 {
@L:>!< case VK_MENU:
RxN,^!OV MaskBits|=ALTBIT;
*[R
eb% break;
Io|Aj case VK_CONTROL:
;6{@^ MaskBits|=CTRLBIT;
t2iv(swTe break;
+@K09ge case VK_SHIFT:
?8mlZ
X9C MaskBits|=SHIFTBIT;
t
6^l `6:p break;
MqA`yvQm default: //judge the key and send message
Tl|:9_:t break;
(%:>T Q( }
T=:]]nf?M for(int index=0;index<MAX_KEY;index++)
-}6xoF? {
gOK\%&S] if(hCallWnd[index]==NULL)
D^;*U[F? continue;
I]y.8~xs if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*d',Vuv&[ {
RTu4@7XP SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~|AwN [ bProcessed=TRUE;
UD y(v ] }
BMIyskl=i }
$VQtwuYt }
)
(Tom9^ if(!bProcessed){
F[!ckes<bB for(int index=0;index<MAX_KEY;index++){
|fY/i]
Ax if(hCallWnd[index]==NULL)
v^7LctcVm continue;
ZB[Qs if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Mf#83<&K SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
cbu@*NzY, }
?P7]u>H }
OcSEo7W }
CCGV~e+ return CallNextHookEx( hHook, nCode, wParam, lParam );
?<yM7O,4 }
56Z\-=KAU irZFV
BOOL InitHotkey()
}Y17*zp% {
M#@aB"@J> if(hHook!=NULL){
5')8r';, nHookCount++;
*$M'`vj: return TRUE;
2qO3XI }
T=YzJyQC) else
9=/N|m8. hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
8Z2.`(3c[ if(hHook!=NULL)
.M4IGOvOS nHookCount++;
<vbIp& return (hHook!=NULL);
Bfv.$u00p }
:;!\vfZbU BOOL UnInit()
'?yCq$& {
VIR. yh if(nHookCount>1){
3v!~ cC~cI nHookCount--;
k 2%S`/: return TRUE;
VZIR4J[\. }
<39!G7ny BOOL unhooked = UnhookWindowsHookEx(hHook);
?Jtg3AY if(unhooked==TRUE){
jec:i-, nHookCount=0;
,goBq3[%? hHook=NULL;
n!He& }
)DUL)S return unhooked;
!1uzX
Kb }
Cv=GZGn- 7=*VpX1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H%z@h~s> {
em]xtya BOOL bAdded=FALSE;
T_OF7? for(int index=0;index<MAX_KEY;index++){
y02u?wJ if(hCallWnd[index]==0){
tO.$+4a hCallWnd[index]=hWnd;
Ca $c; HotKey[index]=cKey;
*N/hc HotKeyMask[index]=cMask;
g3?U#7i bAdded=TRUE;
J%dJw} KeyCount++;
H "+c)FGi break;
|&hU=J
o }
i!MwBYk }
y?N Nz0 return bAdded;
+EAS Aq }
:nQp.N*p LI:Tc7t BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5su.+4z\ {
\-.
Tg!Q6 BOOL bRemoved=FALSE;
%3a|<6 for(int index=0;index<MAX_KEY;index++){
F1A1@{8bN if(hCallWnd[index]==hWnd){
9[|4[3K if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
BGjb`U#%3 hCallWnd[index]=NULL;
te2
Iu%5 z HotKey[index]=0;
)45_]tk> HotKeyMask[index]=0;
(Imp
$ bRemoved=TRUE;
hswTn`f KeyCount--;
FpkXOj?* break;
!z=pP$81 }
>x'bZ]gm }
} 21j }
+(ny|r[# return bRemoved;
( D}"&2 }
&jJckT KZK,w#9. void VerifyWindow()
@
u1Q-: {
?*K<*wBw# for(int i=0;i<MAX_KEY;i++){
.k]#XoE if(hCallWnd
!=NULL){ dp^N_9$cdO
if(!IsWindow(hCallWnd)){ YMAQ+A!
hCallWnd=NULL; 1 !s28C5u
HotKey=0; {Nq?#%vdT
HotKeyMask=0;
hh&Js'd
KeyCount--; $'$>UFR
} caD5Pod4
} 9N}W(>
} kGD|c=K}
} bhKV +oN
.S|-4}G(6
BOOL CHookApp::InitInstance() ]7F)bIG[
{ FR' b`Xv:
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^I./L)0=}
hins=AfxGetInstanceHandle(); ;xW{Ehq-h
InitHotkey(); /.-m}0h|W-
return CWinApp::InitInstance(); gDhl-
} gX"T*d>y
T{~M iC6A
int CHookApp::ExitInstance() oUS,+e
{ L{K*~B -p
VerifyWindow(); W]~ZkQ|P
UnInit(); Nz @8
return CWinApp::ExitInstance(); u~)%tL
} U$EM.ot
t;XS;b%
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5@.zz"o.`
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Hf.xd.Yw
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |QqWVelc
#if _MSC_VER > 1000 r
&c_4%y
#pragma once Deog4Ol"/
#endif // _MSC_VER > 1000 K*[0dza$
rUvwpP"k
class CCaptureDlg : public CDialog ;y,NC2Xj
{ FP@A;/c
// Construction _3zU,qm+
public: aKD;1|)
BOOL bTray; K5+!(5V~
BOOL bRegistered; l^BEFk;
BOOL RegisterHotkey(); 0c-QIr}m
UCHAR cKey; _jk|}IB;X
UCHAR cMask; F94V 5_[
void DeleteIcon(); ],$6&Cm
void AddIcon(); 6e&g$R
v
UINT nCount; 0 c,bet{m
void SaveBmp(); H7J`]nr6
CCaptureDlg(CWnd* pParent = NULL); // standard constructor qY# m*R
// Dialog Data \4C)~T:*
//{{AFX_DATA(CCaptureDlg) ^U"
q|[qy
enum { IDD = IDD_CAPTURE_DIALOG }; i$g|?g~]
CComboBox m_Key; 8QPT\~
BOOL m_bControl; cy9N:MR(c
BOOL m_bAlt; `2sdZ/fO
BOOL m_bShift; _RgxKp/d
CString m_Path; *j/uihY
CString m_Number; O&F<oM
//}}AFX_DATA }t}38%1i
// ClassWizard generated virtual function overrides R+k=Ea&x
//{{AFX_VIRTUAL(CCaptureDlg) |F3vRt@
public: ?i/73H+;D3
virtual BOOL PreTranslateMessage(MSG* pMsg); j}i,G!-u
protected: S_`W@cp[
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -%saeX Wo
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (=6P]~,
//}}AFX_VIRTUAL WvIK=fdZ$
// Implementation (di)`D5Q
protected: DI L)7K4
HICON m_hIcon; @F>[DW]O
// Generated message map functions 9 J$Y,Z
//{{AFX_MSG(CCaptureDlg) t- !h
X/
virtual BOOL OnInitDialog(); N=hSqw[
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1VRqz5
afx_msg void OnPaint(); 27}.s0{D
afx_msg HCURSOR OnQueryDragIcon(); M|$H+e }:
virtual void OnCancel(); F%w\D9+P
afx_msg void OnAbout(); Jv-zB]3&
afx_msg void OnBrowse(); 39'X$!
afx_msg void OnChange(); R:SIs\%o
//}}AFX_MSG
gvvFU,2
DECLARE_MESSAGE_MAP() PEMxoe<+
}; 4Sd+"3M
#endif 2l]C55p)s
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rO$i0k
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wY."Lw> 6
#include "stdafx.h" =>E44v
#include "Capture.h" 37.)@
#include "CaptureDlg.h" 7{?lEQ&UE
#include <windowsx.h> ][s*~VK;
#pragma comment(lib,"hook.lib") >$d d9|[
#ifdef _DEBUG +H5 jRw
#define new DEBUG_NEW s|Imz<IE
#undef THIS_FILE T\<M?`Y
static char THIS_FILE[] = __FILE__;
^XjvJa
#endif C.DoXE7
#define IDM_SHELL WM_USER+1 %D%e:se
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TXY
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >KH(nc$
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J
tn&o"C
class CAboutDlg : public CDialog #d7)$ub
{ $~;6 hnrm
public: _rWTw+
L
CAboutDlg(); 6|>"0[4S
// Dialog Data )o}=z\M-bN
//{{AFX_DATA(CAboutDlg) >?:i6&4o
enum { IDD = IDD_ABOUTBOX }; \`p |,j
//}}AFX_DATA 2/a04qA#
// ClassWizard generated virtual function overrides l,~ N~?
//{{AFX_VIRTUAL(CAboutDlg) _&8KB1~
protected: ]lG_rGw
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DU*Hnii
//}}AFX_VIRTUAL am)J'i,
// Implementation 8.
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protected: $P1d#;rb%
//{{AFX_MSG(CAboutDlg) =qVAvo'
//}}AFX_MSG )aO!cQ{s
DECLARE_MESSAGE_MAP() p]J]<QaZD
}; *axza~d
_YD<Q@
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .5$V7t.t$\
{ {BwN4r46
//{{AFX_DATA_INIT(CAboutDlg) E!oJ0*@
//}}AFX_DATA_INIT +LU ).
} ~T{d9yNW1
jw6 ng>9
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1&x0+~G
{ @b(gjOE
CDialog::DoDataExchange(pDX); '~!l(&X
//{{AFX_DATA_MAP(CAboutDlg) q0xE&[C[M
//}}AFX_DATA_MAP 0v,`P4_k
} R?FtncL%D
>goAf`sqo
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %%H. &*i,
//{{AFX_MSG_MAP(CAboutDlg) zv3<i (
// No message handlers T<_1|eH
//}}AFX_MSG_MAP 34&$_0zn
END_MESSAGE_MAP() |cBF-KNZ
;L/T}!Dx
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w2mlqy2L
: CDialog(CCaptureDlg::IDD, pParent) 6CzvRvA*P
{ c~u
F
//{{AFX_DATA_INIT(CCaptureDlg) #)c;i<Q3S
m_bControl = FALSE; :X'U`jE
m_bAlt = FALSE; 1Y"y!\t7G
m_bShift = FALSE; Y)-)NLLG;n
m_Path = _T("c:\\"); h;h,dx
m_Number = _T("0 picture captured."); ?f%DVK d
nCount=0; ~O3uje_
bRegistered=FALSE; ) a2m<"
bTray=FALSE; M}RFFg
//}}AFX_DATA_INIT -
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// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 T;vPR,]rz
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nV6g]#~@
} bJ5z??
b|C,b"$N0
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \|4MU"ri
{ za 4B+&JJ
CDialog::DoDataExchange(pDX); x#xO {
//{{AFX_DATA_MAP(CCaptureDlg) iPi'5g(a
DDX_Control(pDX, IDC_KEY, m_Key); ;$&5I9N
DDX_Check(pDX, IDC_CONTROL, m_bControl); %)@(Tye -
DDX_Check(pDX, IDC_ALT, m_bAlt); Hw-oh?=
DDX_Check(pDX, IDC_SHIFT, m_bShift); Z`Eb
L
DDX_Text(pDX, IDC_PATH, m_Path); 4OgGZ
DDX_Text(pDX, IDC_NUMBER, m_Number); [T&y5"@
//}}AFX_DATA_MAP J##X5'a3*
} ?^A:~" ~
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Wn</",Gf
//{{AFX_MSG_MAP(CCaptureDlg) a-A4xL.gm
ON_WM_SYSCOMMAND() rMFf8D(Y
ON_WM_PAINT() SYhspB
ON_WM_QUERYDRAGICON() z Clm'X/
ON_BN_CLICKED(ID_ABOUT, OnAbout) \.-y
LS.
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) K%#C+`Ij
ON_BN_CLICKED(ID_CHANGE, OnChange) A>,fG9pR
//}}AFX_MSG_MAP ,,-3p#Pbw
END_MESSAGE_MAP() "4-Nnm
&(1NOyX&
BOOL CCaptureDlg::OnInitDialog() }U1{&4Ph
{ bWzc=03
CDialog::OnInitDialog(); %R5MAs&-5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); N.cRZm%
ASSERT(IDM_ABOUTBOX < 0xF000); qMj
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CMenu* pSysMenu = GetSystemMenu(FALSE); `6F8Kqltr
if (pSysMenu != NULL) !a&F:Fbm
{ q\=[v
CString strAboutMenu; `SbX`a0p2
strAboutMenu.LoadString(IDS_ABOUTBOX); +0042Yi
if (!strAboutMenu.IsEmpty()) &3/H
P)*<]
{ mT$tAwzTC{
pSysMenu->AppendMenu(MF_SEPARATOR); :Fk&2WsW:
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 30-wTcG
} DEp:
vlW@
} <]`2H}*U'
SetIcon(m_hIcon, TRUE); // Set big icon (G;*B<|A
SetIcon(m_hIcon, FALSE); // Set small icon YZJP7nN
m_Key.SetCurSel(0); b%$C!Tq'
RegisterHotkey(); Vp94mi#L}
CMenu* pMenu=GetSystemMenu(FALSE); j;vaNg|vQ
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);
'Z}$V*
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :CHd\."%+1
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0w&1wee(
return TRUE; // return TRUE unless you set the focus to a control $~\qoW<
} L zy|<:K+$
K 6Ua~N^
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hY'%SV
p
{ 06O
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 40ZB;j$l
{ GDntGTE~sk
CAboutDlg dlgAbout; (J#3+I
dlgAbout.DoModal(); JC3)G/m(03
} MeS$+9jV(
else 9_$Odc%]
{ .;s4T?j@w
CDialog::OnSysCommand(nID, lParam); CAO{$<M5m
} osI(g'Xb
} 6dlPS{H#U
dy'?@Lj;
void CCaptureDlg::OnPaint() ["9$HL
{ $Q4b~
if (IsIconic()) sP!qv"u
{ <Z[R08 k
CPaintDC dc(this); // device context for painting 06
1=pV$CJ
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); VVOt%d
// Center icon in client rectangle -OxHQ
int cxIcon = GetSystemMetrics(SM_CXICON); Uk4">]oct
int cyIcon = GetSystemMetrics(SM_CYICON); > kT~X ,o
CRect rect; [5-5tipvWp
GetClientRect(&rect); +J9lD`z
int x = (rect.Width() - cxIcon + 1) / 2; Qa+gtGtJ
int y = (rect.Height() - cyIcon + 1) / 2; fZC,%p
// Draw the icon ?;Qk!t2U
dc.DrawIcon(x, y, m_hIcon); HVpaVM
} 29oEkaX2o
else Wi<Fkzj
{
lNw?}H
CDialog::OnPaint(); ~sD'pS
} DQ$/0bq
} 2)YLs5>W%
P8f-&(
HCURSOR CCaptureDlg::OnQueryDragIcon() E%N]t} }[
{ I6_+3}Hm{
return (HCURSOR) m_hIcon; *yx:nwmo
} YzqhFFaj.
vP!gLN]TV
void CCaptureDlg::OnCancel() dmne+ufB
{ !RI&FcK
if(bTray) 5o*x?P!$
DeleteIcon(); \T?O.
CDialog::OnCancel(); {H74`-C)W
} AyDK-8a
yI)2:Ca*
void CCaptureDlg::OnAbout() K""04Ew*pV
{ (;N_lF0
CAboutDlg dlg; JT+P>\\];'
dlg.DoModal(); SL*(ZEn"
} 4-MA!&
:n=+$Dq
void CCaptureDlg::OnBrowse() {sLh=iK
{ [(hENX}o:
CString str; 8Vx'sJ>r4
BROWSEINFO bi; _z;N|Xe
char name[MAX_PATH]; 7K~=Q Ec
ZeroMemory(&bi,sizeof(BROWSEINFO)); 3HD=)k
bi.hwndOwner=GetSafeHwnd(); N^)OlH
bi.pszDisplayName=name; j<[<qU:
bi.lpszTitle="Select folder"; JW$#~"@r
bi.ulFlags=BIF_RETURNONLYFSDIRS; kF?\p`[a
LPITEMIDLIST idl=SHBrowseForFolder(&bi); a)]N#gx
if(idl==NULL) 2&M
8Wb#
return; @S{,g;8
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); u}$?r\H'(
str.ReleaseBuffer(); ev>: 3_ s
m_Path=str; $ _zdjzT
if(str.GetAt(str.GetLength()-1)!='\\') M:A7=rO~
m_Path+="\\"; jGt[[s
UpdateData(FALSE); i<l)To -
} 5%9&
7
j%lW+[%
void CCaptureDlg::SaveBmp() d(tq;2-
{ ?D#Vh a
CDC dc; 9%x[z%06
dc.CreateDC("DISPLAY",NULL,NULL,NULL); =T1i(M#
CBitmap bm; m2_B(-
int Width=GetSystemMetrics(SM_CXSCREEN); [p(Y|~
int Height=GetSystemMetrics(SM_CYSCREEN); 8u>E(Vmpu
bm.CreateCompatibleBitmap(&dc,Width,Height); %P?W^mI
CDC tdc; ?O.&=im_
tdc.CreateCompatibleDC(&dc); 6d_l[N
CBitmap*pOld=tdc.SelectObject(&bm); _vad>-=D*U
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r8mE
tdc.SelectObject(pOld); # H4dmnV
BITMAP btm; :g Ze>
bm.GetBitmap(&btm); pJ{sBp_$
DWORD size=btm.bmWidthBytes*btm.bmHeight; 419t"1b
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); U!('`TYe
BITMAPINFOHEADER bih; mFT[[Z#
bih.biBitCount=btm.bmBitsPixel; D.RHvo~6
bih.biClrImportant=0; )+{'p0
bih.biClrUsed=0; ~(}zp<e|
bih.biCompression=0; Q?vGg{>
bih.biHeight=btm.bmHeight; gbF.Q7?$u
bih.biPlanes=1; }lhJt|q c
bih.biSize=sizeof(BITMAPINFOHEADER); TK'(\[E
bih.biSizeImage=size; hF6EOCY6D
bih.biWidth=btm.bmWidth; &DgIykqN
bih.biXPelsPerMeter=0; @L`t/OD
bih.biYPelsPerMeter=0; $AoN,B>
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x}-r Ar
static int filecount=0; .a$][Jny
CString name; c" yf>0
name.Format("pict%04d.bmp",filecount++); TzVNZDQ`Jl
name=m_Path+name; Ry,jPw5<
BITMAPFILEHEADER bfh; 1h|JKu0
bfh.bfReserved1=bfh.bfReserved2=0; /+%1Kq.hP
bfh.bfType=((WORD)('M'<< 8)|'B'); -8g ;t3z
bfh.bfSize=54+size; 1'M<{h<sP
bfh.bfOffBits=54; <UeO+M(
CFile bf; Krz[ f
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nsYS0
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2Ui)'0
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); je.mX /Lpj
bf.WriteHuge(lpData,size); `XQM)A
bf.Close(); FD[*mCGZ
nCount++; iz>a0~(K
} !<@Zf4m
GlobalFreePtr(lpData); #AE'arT<
if(nCount==1) ?$9C[Kw`
m_Number.Format("%d picture captured.",nCount); "h\{PoG
else wC;N*0Th
m_Number.Format("%d pictures captured.",nCount); Ry tQNwv3
UpdateData(FALSE); Q']:k}y
} u.R:/H<>~
KD=T04v
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8&B{bS
{ Jt@7y"<
if(pMsg -> message == WM_KEYDOWN) :43K)O"
{ ^<7)w2ns
if(pMsg -> wParam == VK_ESCAPE) S-g`rTx
return TRUE; :U^a0s%B
if(pMsg -> wParam == VK_RETURN) 5YJLR;
return TRUE; >i-cR4=LL{
} mbU[fHyV
return CDialog::PreTranslateMessage(pMsg); ,@8>=rT
} YB.r-c"Y
eLM_?9AZ!R
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3@_je)s
{ K'7i$bl%
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ oe# :EfT
SaveBmp(); (F
+if
return FALSE; 0l!@bj
} esWgYAc3{
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?&j[Rj0pH
CMenu pop; 52,p CyU
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xLP yV&j-
CMenu*pMenu=pop.GetSubMenu(0); }2-{4JIq}
pMenu->SetDefaultItem(ID_EXITICON); dt<PZ.
CPoint pt; s+$l.aIO!
GetCursorPos(&pt); /)e&4.6
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); T1LtO O
if(id==ID_EXITICON) [89#8|+
DeleteIcon(); eOE7A'X
else if(id==ID_EXIT) pTX{j=n!
OnCancel(); 1.]#FJe
return FALSE; HFB2ep7N
} :I1)=8lO
LRESULT res= CDialog::WindowProc(message, wParam, lParam); S9t_2%e
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) h1:uTrtA
AddIcon(); uL1e?
return res; YO|Kc
{j2e
} FDkRfh K
:w_Zr5H]
void CCaptureDlg::AddIcon() { %vX/Ek
{ ck){N?y
NOTIFYICONDATA data; g>CF|Wj
data.cbSize=sizeof(NOTIFYICONDATA); a]Bm0gdrO
CString tip; "[q/2vC
tip.LoadString(IDS_ICONTIP); k9vr6We'
data.hIcon=GetIcon(0); p3M)gH=N
data.hWnd=GetSafeHwnd(); W7c(]
tg.
strcpy(data.szTip,tip); <=l!~~%
data.uCallbackMessage=IDM_SHELL; 6@t4pML
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &HNJ'
data.uID=98; R#"kh/M
Shell_NotifyIcon(NIM_ADD,&data); DGz'Dn
ShowWindow(SW_HIDE); 3?|Fn8dQR.
bTray=TRUE; Zz'(!h Uy
} b'p bf
mqrP0/sN
void CCaptureDlg::DeleteIcon() cZuZfMDM
{ tx;MH5s/V
NOTIFYICONDATA data; &cV$8*2b^
data.cbSize=sizeof(NOTIFYICONDATA); W/<]mm~95
data.hWnd=GetSafeHwnd(); m"t\@f
data.uID=98; 5?r#6:(yI
Shell_NotifyIcon(NIM_DELETE,&data); 8 P.t
ShowWindow(SW_SHOW); Am'5|
SetForegroundWindow(); #UG| \}Lp
ShowWindow(SW_SHOWNORMAL); D}XyT/8G3
bTray=FALSE; BNw^ _j1
} \rY|l
W$O^IC
void CCaptureDlg::OnChange() pk%I98! Jy
{ P%z\^\p"5
RegisterHotkey(); GNS5v-"H
} nyWA(%N1
(cAv :EKpo
BOOL CCaptureDlg::RegisterHotkey() LyH8T'C~
{ yH#zyO4fD-
UpdateData(); z9}rT<hy
UCHAR mask=0; z'=*pIY5f
UCHAR key=0; FY)v rM*yh
if(m_bControl) =24)`Lyb
mask|=4; <6Q]FH!6
if(m_bAlt) nud,ag
mask|=2; 5V!L~#
if(m_bShift) wv>Pn0cO
mask|=1; 060<wjX6
key=Key_Table[m_Key.GetCurSel()]; ](a*R
if(bRegistered){ X+)68
DeleteHotkey(GetSafeHwnd(),cKey,cMask); %Rj:r!XB:
bRegistered=FALSE; .\= GfF'
} g6o-/A!Q3
cMask=mask; M7^PWC
cKey=key; [7q~rcf,Z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M;OY+|uA
return bRegistered; q{@j$fMt0
} rpu9
ny%-u&1k
四、小结 .%_scNP
wUHuykF
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。