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:
x?]fHin_
,gW$m~\ 一、实现方法
'"XVe+.O P9R-41! 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
q Y!LzKM0 C8do8$ #pragma data_seg("shareddata")
eY%Ep=J HHOOK hHook =NULL; //钩子句柄
JvEW0-B^l, UINT nHookCount =0; //挂接的程序数目
3UF^Ff<wo static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
EuA352x static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
?9 W2ax-4 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
eoFG$X/PO static int KeyCount =0;
dNCd-ep static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
's5H_ah #pragma data_seg()
K47.zu mI\[L2x 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。
[vz2< genn ?)[=>Kp 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:
I.Xbowl Hq~SRc~ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
O>I%O^ cKey,UCHAR cMask)
+3M1^: {
?v-!`J>EF# BOOL bAdded=FALSE;
1FG"Ak}D for(int index=0;index<MAX_KEY;index++){
$C,`^n' if(hCallWnd[index]==0){
\rT>&o .i hCallWnd[index]=hWnd;
-;;m/QM HotKey[index]=cKey;
s0CDp"uJY HotKeyMask[index]=cMask;
Z%b1B<u$ bAdded=TRUE;
]ncK M?'O KeyCount++;
U6o]7j&6 break;
1vAJ(O{- }
+ rM]RFi }
+6~zMKp return bAdded;
1D2RhM% }
uKTYb#E7 //删除热键
.g7\+aiTUd BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
IGo5b-ds {
0+)1KU)I BOOL bRemoved=FALSE;
@*uZ+$ for(int index=0;index<MAX_KEY;index++){
D51s)? if(hCallWnd[index]==hWnd){
Z^Wv(:Nr if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
J9f]=1` hCallWnd[index]=NULL;
[g}0.J`_ HotKey[index]=0;
![eY%2;< HotKeyMask[index]=0;
1bDAi2 H bRemoved=TRUE;
&LG|YvMY6 KeyCount--;
5Vdy:l break;
>I0 a$w }
Jh36NE8r }
0W_u"UY$c }
,1.Td=lY$ return bRemoved;
w_;$ahsu~ }
&os:h]
C 5|`./+Ghk pV!WZUfg DLL中的钩子函数如下:
2|(lKFkQ K@oyvJ$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
}7K~- {
[ \%a7ji# BOOL bProcessed=FALSE;
snNB;hkj if(HC_ACTION==nCode)
;TK$?hrv*1 {
jK%Lewq if((lParam&0xc0000000)==0xc0000000){// 有键松开
(dx~lMI switch(wParam)
@k# xr {
T1 1>&K) case VK_MENU:
Q ~n%c7 MaskBits&=~ALTBIT;
_KBa`lhE break;
\/nSRAk case VK_CONTROL:
-G'3&L4
D MaskBits&=~CTRLBIT;
]r%fAmj break;
3qDbfO[ case VK_SHIFT:
Ls3r( Tf MaskBits&=~SHIFTBIT;
)>iPx.hVSS break;
;?TM_%> default: //judge the key and send message
V&/Cb&~Uw break;
e~9g~k]s }
FF7?|V!Q for(int index=0;index<MAX_KEY;index++){
eLV[U if(hCallWnd[index]==NULL)
s;[=B continue;
X`-o0HG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L)S
V?FBx {
-6X+:r`>u SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
zz<o4bR bProcessed=TRUE;
T-x9IoE }
l1 _"9a%H }
ux17q>G }
RMid}BRE else if((lParam&0xc000ffff)==1){ //有键按下
DK'S4%;Sp switch(wParam)
\C2HeA\#SW {
79k+R9m case VK_MENU:
<K>qK]|C MaskBits|=ALTBIT;
QF22_D<.}J break;
H|MAbx
7 case VK_CONTROL:
[A]
+Azc MaskBits|=CTRLBIT;
t1$pl6&, break;
I*g[Y= case VK_SHIFT:
/YvwQ MaskBits|=SHIFTBIT;
jfam/LL{V break;
+CXq41g"c default: //judge the key and send message
{d)L0KXK break;
hvA|d=R( }
m%.[|sZ3EM for(int index=0;index<MAX_KEY;index++){
gO@LJ if(hCallWnd[index]==NULL)
uu>R)iTQ%S continue;
sheCwhV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}D3hP|.X {
; 3sjTqD SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
FF|M7/[~ bProcessed=TRUE;
[o7Qr?RN }
axK/YE7t }
[9F }
"5EL+z3v if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
6?JvvS5 for(int index=0;index<MAX_KEY;index++){
q]s_ hWWv if(hCallWnd[index]==NULL)
t\v~ A0 continue;
*<h )q)HS if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~~m(CJ4S SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
=8"xQ>D62 //lParam的意义可看MSDN中WM_KEYDOWN部分
r029E- }
e)87
&
7 }
: &~LPmJ }
$U)nrni return CallNextHookEx( hHook, nCode, wParam, lParam );
}gE^HH' }
<7gv<N6BQf "x0KiIoPk 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
?N@[R]; zH#urF6< BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5{v uN)K3 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0h{&k7T<7 GNHW bC6_m 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
OsRizcgdA UgZL<} LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
g'2;/// {
UA*Kuad if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ep*8*GmP {
,# %I$ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
\6aisK SaveBmp();
7?);wh 7` return FALSE;
~]'yUd1gSZ }
eax"AmO …… //其它处理及默认处理
HXkXDX9&'. }
%c8@ +%K~HYN o*oFCR]j 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。
.kgt?r
9w=[}<E 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。
k]2_vk^ MN:LL
< 二、编程步骤
E Q:6R|L |=V~CQ] 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";
y'non0P. >Pvz5Hf/wW 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
;krIuk- h
R6Pj"@0 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;
Ry? f; s ~mv5{C 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;
^ohIJcI- ksUF(lYk 5、 添加代码,编译运行程序。
Q^* 33 .>LJ(Sx9b 三、程序代码
Z'|k M! dfZ`M^NU ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
bL+}n8B #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Q\btl/? #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Wr'1Y7z #if _MSC_VER > 1000
tZu1jBO_Q4 #pragma once
i)$<j!L #endif // _MSC_VER > 1000
Wv~&Qh} #ifndef __AFXWIN_H__
b #Llu$ #error include 'stdafx.h' before including this file for PCH
Lg|d[*;'7 #endif
/w2-Pgm-[\ #include "resource.h" // main symbols
,lFp4 C class CHookApp : public CWinApp
m1xR uj] {
jX^_(Kg public:
QbY@{"" ` CHookApp();
FPM l;0{ // Overrides
Iv*u#]{t // ClassWizard generated virtual function overrides
wz BI<0]z //{{AFX_VIRTUAL(CHookApp)
QGE0pWL-a public:
sa"}9IE*8 virtual BOOL InitInstance();
\0&F'V virtual int ExitInstance();
Sl@Ucc31 //}}AFX_VIRTUAL
O=^/58(m //{{AFX_MSG(CHookApp)
)lq+Gv[%F // NOTE - the ClassWizard will add and remove member functions here.
q1m{G1W
n // DO NOT EDIT what you see in these blocks of generated code !
^`Hb7A(
//}}AFX_MSG
aK
3'u DECLARE_MESSAGE_MAP()
#7/39zTK };
cH+ ~|3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
,J:Ro N_: BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
q>5j (,6F BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
cS
Qb3}a\ BOOL InitHotkey();
Fh|{ib BOOL UnInit();
yhs:.h #endif
OB*V4Yv {<?8Y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
.N`*jT #include "stdafx.h"
]b:>7_la #include "hook.h"
9Hd_sNUu\ #include <windowsx.h>
y*p02\) #ifdef _DEBUG
IIAmx[ b #define new DEBUG_NEW
L|6I #undef THIS_FILE
T;V!>W37 static char THIS_FILE[] = __FILE__;
DgY
!)cS #endif
sz%_9;`dpL #define MAX_KEY 100
mkl^2V13~ #define CTRLBIT 0x04
1I)oT-~ #define ALTBIT 0x02
C2\zbC[qm #define SHIFTBIT 0x01
A~ _2" #pragma data_seg("shareddata")
*N"CV={No HHOOK hHook =NULL;
n=|% H'U UINT nHookCount =0;
)ax>* static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
O;|Cu7WU static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
kX8NRPW static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
iq[IZdza static int KeyCount =0;
xc\zRsY` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
d325Cw? #pragma data_seg()
vm'Z A7f6 HINSTANCE hins;
CPMGsW^ void VerifyWindow();
RBBmGZ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
>k/cm3 //{{AFX_MSG_MAP(CHookApp)
U4<c![Pp. // NOTE - the ClassWizard will add and remove mapping macros here.
>?rMMR+A // DO NOT EDIT what you see in these blocks of generated code!
F=e-jKogK //}}AFX_MSG_MAP
v+8Ybq END_MESSAGE_MAP()
K1Uq`T J L(sT/ CHookApp::CHookApp()
/,UnT(/k( {
P.QF9% // TODO: add construction code here,
~QDM
.5 // Place all significant initialization in InitInstance
C+[)^2M{ }
aB?usVoS C/'w CHookApp theApp;
M.r7^9 P LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
B?- poB& {
-
l^3>!MAM BOOL bProcessed=FALSE;
9 <{C9 if(HC_ACTION==nCode)
=:]v~Ehq {
:9Jy/7/ if((lParam&0xc0000000)==0xc0000000){// Key up
/zoy,t-i switch(wParam)
z|X6\8f {
cD}]4 case VK_MENU:
H-U_ MaskBits&=~ALTBIT;
V)N{Fr)& break;
XmwAYf case VK_CONTROL:
u3GBAjPsIk MaskBits&=~CTRLBIT;
~BX=n9 break;
[/%N2mj case VK_SHIFT:
e}S+1G6r) MaskBits&=~SHIFTBIT;
f'H|K+bO break;
^gZ,A]
default: //judge the key and send message
d7
H *F break;
/XEW]/4 }
JXYZ5&[ for(int index=0;index<MAX_KEY;index++){
> pP&/ if(hCallWnd[index]==NULL)
GNe^~ continue;
Y)+q[MZ R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+yHz7^6-5 {
c38XM]Jeq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4=MjyH|[Jx bProcessed=TRUE;
CgrQ"N5 }
J}:.I> }
kFV, Fg }
!hhL", else if((lParam&0xc000ffff)==1){ //Key down
~rJG4U switch(wParam)
|E.BGdS {
[nP s case VK_MENU:
/:'>-253 MaskBits|=ALTBIT;
n2hV}t9O break;
>( [,yMIY case VK_CONTROL:
3m`>D
e MaskBits|=CTRLBIT;
~IS8DW$; break;
9;?u% case VK_SHIFT:
~"CGur P MaskBits|=SHIFTBIT;
}Mt1C~{( break;
7K:V<vX5 default: //judge the key and send message
HP1QI/*v break;
(rkg0 }
X3X_=qzc for(int index=0;index<MAX_KEY;index++)
G9 O6Fi {
ow.!4kx{ d if(hCallWnd[index]==NULL)
wz*iwd- continue;
(Y@T5-!D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$?G@ijk, {
?(R3%fU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
qul#)HI bProcessed=TRUE;
x9 %=d }
|uqI}6h. }
pB8D }
IrqM_OjC if(!bProcessed){
,T<JNd' for(int index=0;index<MAX_KEY;index++){
Mzp<s<BX if(hCallWnd[index]==NULL)
]A'{DKR continue;
_>Raw if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
d*0RBgn SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
h@!p:] }
At4\D+J{Vs }
:^v Q4/, }
VP~2F
E return CallNextHookEx( hHook, nCode, wParam, lParam );
Pc`d]*BYi }
:_~.Nt 4a+gM._+O BOOL InitHotkey()
^H3N1eC,`F {
'|[V}K5m/f if(hHook!=NULL){
30!DraW8 nHookCount++;
H@=oVyn/ return TRUE;
ctZ,qg*N }
ERpAV-Zf else
.ybmJU*Hg hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
usB*Wn8 if(hHook!=NULL)
nn_O"fZi nHookCount++;
]?tRO return (hHook!=NULL);
=9GALoGL }
Q&eyqk BOOL UnInit()
o utJ/~9; {
?,>3uD# if(nHookCount>1){
F@i>l{C nHookCount--;
7__[=)(b2X return TRUE;
YsVmU }
](w)e
p~;3 BOOL unhooked = UnhookWindowsHookEx(hHook);
XB7Aa) if(unhooked==TRUE){
lFnls6dp nHookCount=0;
b&:v6#i hHook=NULL;
hv|a8=U!R }
=:gKh return unhooked;
QnWE;zN[7A }
5H0qMt P @:C)^f" BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cag 5w~Px {
Lq2Q:w' BOOL bAdded=FALSE;
e= IdqkJ% for(int index=0;index<MAX_KEY;index++){
]F4QZV(
M if(hCallWnd[index]==0){
,|:.0g[n hCallWnd[index]=hWnd;
qzUiBwUi@ HotKey[index]=cKey;
y2jv84
M HotKeyMask[index]=cMask;
_O`p (6 bAdded=TRUE;
h0tiWHw KeyCount++;
o5o myMN break;
P%aqY~yF3 }
xsZG(Tz }
x77L"5g return bAdded;
2/&=:,"t,B }
pl`4&y%Me &n6{wtBP BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z<nNk.G {
J=`
8 BOOL bRemoved=FALSE;
tO M$'0u for(int index=0;index<MAX_KEY;index++){
;llPM`) if(hCallWnd[index]==hWnd){
J3eud}w if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8;@y\0 hCallWnd[index]=NULL;
>n"0>[:4 HotKey[index]=0;
NnLK!Q HotKeyMask[index]=0;
[ohLG_9 bRemoved=TRUE;
FS1\`#Bm) KeyCount--;
|>;PV4])( break;
,*|Q= }
4$xVm,n|
}
(U:-z=E#1 }
cRLw)"| return bRemoved;
,HZ%q]*:~ }
|?T=4~b
ihrf/b void VerifyWindow()
g0B] ;Y>( {
zPaubqB for(int i=0;i<MAX_KEY;i++){
f24W*#IX if(hCallWnd
!=NULL){ q/EX`%U
if(!IsWindow(hCallWnd)){ *9\j1Nd
hCallWnd=NULL; ?b]zsku8
HotKey=0; LCorT-
HotKeyMask=0; ?Q"andf
KeyCount--; 6$urrSQ`N0
} &=[!L0{
} @z1QoZ^w
} \zBi-GI7
} ZNBowZI
`UsJaoR#f
BOOL CHookApp::InitInstance() ?Lg<)B9
{ EF)BezG5y
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5?0<.f,
hins=AfxGetInstanceHandle(); R-Edht|{
InitHotkey(); syl7i>P
return CWinApp::InitInstance(); /e2zH
} \S;[7T
}yT/UlU
int CHookApp::ExitInstance() ]}L'jK
0
{ T!c|O3m
VerifyWindow(); HMd?`
UnInit(); Nc\DXc-N
return CWinApp::ExitInstance(); *Jsb~wta
} XDPR$u8hM
<x}wy+SG
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !n-Sh<8
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %~Yo{4mHs
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;Nn(
#if _MSC_VER > 1000 v9f+ {Y%-
#pragma once jEBn"]\D
#endif // _MSC_VER > 1000 oMbd1uus
: s
*
class CCaptureDlg : public CDialog |5~Oh`w
{ rI$NNk'A
// Construction >?^oxB"<Gc
public: 5M5Bm[X
BOOL bTray; |S8$NI2
BOOL bRegistered; :!aLa}`@
BOOL RegisterHotkey(); ;%n'k
UCHAR cKey; D6VdgU|
UCHAR cMask; s@Q7F{z
void DeleteIcon(); $mJv\;t
void AddIcon(); Jqxd92 bI
UINT nCount; dj0%?g>
void SaveBmp(); 9`f@"%h
CCaptureDlg(CWnd* pParent = NULL); // standard constructor sQgz}0_=)
// Dialog Data zH1;h
//{{AFX_DATA(CCaptureDlg) kK75 (x
enum { IDD = IDD_CAPTURE_DIALOG }; }d.X2?
CComboBox m_Key; YoKE=ln7
BOOL m_bControl; i9ySD
BOOL m_bAlt; B#g~c<4<
BOOL m_bShift; $z$^
yjL
CString m_Path; $@Vn+|
Ix
CString m_Number; cSPQ
NYU:
//}}AFX_DATA FJ0I&FyWs
// ClassWizard generated virtual function overrides Jr5S8c|"
//{{AFX_VIRTUAL(CCaptureDlg) 9QU\J0c/
public: : #a
virtual BOOL PreTranslateMessage(MSG* pMsg); ZxtO.U2
protected: v< P0f"GH
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UBL{3s^"
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Z1fY' f
//}}AFX_VIRTUAL ()aCE^C
// Implementation U`6|K$@
protected: O:0{vu9AQ
HICON m_hIcon; 6Q :Wo)^!
// Generated message map functions q(n"r0)=
//{{AFX_MSG(CCaptureDlg) `NtW+v
virtual BOOL OnInitDialog(); vEI{AmogRx
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c0o]O[
afx_msg void OnPaint(); .=eEuH
afx_msg HCURSOR OnQueryDragIcon(); dfFw6R
virtual void OnCancel(); c'Z=uL<Rm
afx_msg void OnAbout(); WWpMuB_G
afx_msg void OnBrowse(); EV( F!&
afx_msg void OnChange(); |Ahf 01
//}}AFX_MSG kN/YnY*J<
DECLARE_MESSAGE_MAP() ,=+t2Bn
}; |3~m8v2-
#endif RG'iWA,9m`
&5y
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^}P94( oz
#include "stdafx.h" (7qlp*8.s
#include "Capture.h" nXn@|J&z~U
#include "CaptureDlg.h" 3(oMASf
#include <windowsx.h> AFi_P\X
#pragma comment(lib,"hook.lib") J$6WU z:?
#ifdef _DEBUG Z]Bv
#define new DEBUG_NEW P^OmJ;""D
#undef THIS_FILE }-fHS;/
static char THIS_FILE[] = __FILE__;
uF<34
#endif [)V~U?
#define IDM_SHELL WM_USER+1 nT?+^Ruc
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2OoANiX
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~HIj+kN
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [7}3k?42X
class CAboutDlg : public CDialog {dxFd-K3
{ tMw65Xei6b
public: U5C]zswL
CAboutDlg(); 9]v,3'QI
// Dialog Data !L.R"8!
//{{AFX_DATA(CAboutDlg) )B]s.w
enum { IDD = IDD_ABOUTBOX }; j4;^5
Dy^
//}}AFX_DATA "73*0'm
// ClassWizard generated virtual function overrides jSpj6:@B
//{{AFX_VIRTUAL(CAboutDlg) l,J>[Q`<
protected: s?HK2b^;D
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =0?5hxM d
//}}AFX_VIRTUAL z%E(o%l8
// Implementation Tw';;euw
protected: ZbC$Fk,,I&
//{{AFX_MSG(CAboutDlg) lG-B)
F
//}}AFX_MSG <}lah%4F
DECLARE_MESSAGE_MAP() [2,D] e
}; I/w;4!+)
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wn@~80)$
{ 8=$X hC
//{{AFX_DATA_INIT(CAboutDlg) Z7bJ<TpZ
//}}AFX_DATA_INIT poAJl;T
} (d#&m+
g]
ry|a_3X(I
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XMS:F]HN
{ no8\Oees
CDialog::DoDataExchange(pDX); "_&ZRcd*
//{{AFX_DATA_MAP(CAboutDlg) Y$>NsgQn6
//}}AFX_DATA_MAP <-.@,HQ+
} sl-wNIQ
:h(RS ;
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i[[.1MnS
//{{AFX_MSG_MAP(CAboutDlg) (nO2+@!
// No message handlers K+|XI|1p
//}}AFX_MSG_MAP pyV`O[
END_MESSAGE_MAP() #M~yt`R~
+\ftSm>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s=:)!M.i
: CDialog(CCaptureDlg::IDD, pParent) 6hj[/O)E
{ Y-bTKSn
//{{AFX_DATA_INIT(CCaptureDlg) w<H2#d>5!@
m_bControl = FALSE; w=]A;GgA
m_bAlt = FALSE; [z"E"_r~%Y
m_bShift = FALSE; ?;o0~][!
m_Path = _T("c:\\"); 4L,wBce;,t
m_Number = _T("0 picture captured."); Vz0(D
nCount=0; D]_6OlIE#'
bRegistered=FALSE; <cOjtq,0
bTray=FALSE; VHPqEaR
//}}AFX_DATA_INIT eGT&&Y
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 q6pHL
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 8KJ`+"<=@
} ' ds2\gN
.u\$wJ9Ai
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (.=ig
X
{ 7>z {2D
CDialog::DoDataExchange(pDX); J;~YD$
//{{AFX_DATA_MAP(CCaptureDlg) Aa_@&e
DDX_Control(pDX, IDC_KEY, m_Key); [;Ih I
DDX_Check(pDX, IDC_CONTROL, m_bControl); gbYM1guiD
DDX_Check(pDX, IDC_ALT, m_bAlt); `^#4okg]
DDX_Check(pDX, IDC_SHIFT, m_bShift); E{[Y8U1n
DDX_Text(pDX, IDC_PATH, m_Path); &Z>??|f
DDX_Text(pDX, IDC_NUMBER, m_Number); Tv1oy%dK
//}}AFX_DATA_MAP s<LnUF1b
} x"sbm
D7nK"]HG;l
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O[= L#wi
//{{AFX_MSG_MAP(CCaptureDlg) 8Tg1 >q<
ON_WM_SYSCOMMAND() 3Qd/X&P
ON_WM_PAINT() EC5= 2w<
ON_WM_QUERYDRAGICON() XY{N"S8
ON_BN_CLICKED(ID_ABOUT, OnAbout) e|:\Ps `8
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }j2;B 8j
ON_BN_CLICKED(ID_CHANGE, OnChange) >d`GNE
//}}AFX_MSG_MAP t]0DT_iE
END_MESSAGE_MAP() Y2tVq})!
QuEX|h,F
BOOL CCaptureDlg::OnInitDialog() C9?mxa*z
{ EVLL,x.~:z
CDialog::OnInitDialog(); w0;4O)H$O
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7[P-;8)tq
ASSERT(IDM_ABOUTBOX < 0xF000); N
{{MMIq
CMenu* pSysMenu = GetSystemMenu(FALSE); 0^tY|(b3/M
if (pSysMenu != NULL) E`.hM}h
{ bvJ@H
Z$
CString strAboutMenu; XYR
q"{Id
strAboutMenu.LoadString(IDS_ABOUTBOX); zWU]4;,"
if (!strAboutMenu.IsEmpty()) Uhr2"Nuuy
{ $)@D(m,ybd
pSysMenu->AppendMenu(MF_SEPARATOR); @;Jv/N6@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "f
89
} |hj!NhBe
} (/nnN4\=
SetIcon(m_hIcon, TRUE); // Set big icon DzMg^Kp
SetIcon(m_hIcon, FALSE); // Set small icon E9mu:T
m_Key.SetCurSel(0); h2x9LPLBxT
RegisterHotkey(); baD063P;
CMenu* pMenu=GetSystemMenu(FALSE); ?;v\wx
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?o.d FKUe
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); N$e
mS
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mWYrUI
return TRUE; // return TRUE unless you set the focus to a control ]QHp?Ii1
} d)V8FX,t
uWKmINjv'
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;<m*ASM.3
{ i$%Bo/Y
if ((nID & 0xFFF0) == IDM_ABOUTBOX) W/\VpD) ?;
{ !AJkd.
CAboutDlg dlgAbout; f6K.F
dlgAbout.DoModal(); vGlVr.)
} fQC{LcS
else awo'#Y2>
{ *<S>PbqLw
CDialog::OnSysCommand(nID, lParam); , @UOj=
} BFw_T3}zn
} {e|.AD
%w[Z/
void CCaptureDlg::OnPaint() q=->) &D%
{ _p4]\LA
if (IsIconic()) <A=1]'1\r
{ &*"*b\
CPaintDC dc(this); // device context for painting LA_{[VWYp>
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \~A qA!)6
// Center icon in client rectangle `XH0S`B
int cxIcon = GetSystemMetrics(SM_CXICON); Z" ;q w
int cyIcon = GetSystemMetrics(SM_CYICON); G3:!]}
CRect rect; OFtf)cGE
GetClientRect(&rect); '4{=x]K
int x = (rect.Width() - cxIcon + 1) / 2; v=iiS}s
int y = (rect.Height() - cyIcon + 1) / 2; Lfi6b%/z
// Draw the icon .Ja].hP
dc.DrawIcon(x, y, m_hIcon); ~Z/,o)
} NW5OLa")J<
else Q;VuoHj!
{ o/7u7BQl2
CDialog::OnPaint(); +'c+X^_
} 2Q%7J3I
} 1D#-,#?
FfM^2`xP
HCURSOR CCaptureDlg::OnQueryDragIcon() MZ$uWm`/
{ ";=!PL
return (HCURSOR) m_hIcon; DqQp47kp
} _rB,N#{2R=
-->0e{y
void CCaptureDlg::OnCancel() CnL=s6XD'
{ PlH~um[J
if(bTray) -!_8>r;Q4
DeleteIcon(); Kw`CN
CDialog::OnCancel(); BZ:tVfg.
} % Q6
za'25
LWJ ?p-X
void CCaptureDlg::OnAbout() '42$O
{ I4jRz*Ufe?
CAboutDlg dlg; Jf?6y~X>Y
dlg.DoModal(); O%kUj&h^
} J6s]vV q"
-ymDRoi
void CCaptureDlg::OnBrowse() -MS#YcsV
{ ]87BP%G
CString str; :sg}e
BROWSEINFO bi; rWL;pM<
char name[MAX_PATH]; MBg[hu%
ZeroMemory(&bi,sizeof(BROWSEINFO)); !5lV#w!vb
bi.hwndOwner=GetSafeHwnd(); an"~n`g
bi.pszDisplayName=name; NCkI[d]B@
bi.lpszTitle="Select folder"; :K^J bQ
bi.ulFlags=BIF_RETURNONLYFSDIRS; V2}\]x'1
LPITEMIDLIST idl=SHBrowseForFolder(&bi); PhC3F4
if(idl==NULL) :CE4<
{V
return; KL=<s#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p}JOiiHa
str.ReleaseBuffer(); I<940PZ
m_Path=str; Tp;W4]'a*:
if(str.GetAt(str.GetLength()-1)!='\\') 4{kH;~
z$
m_Path+="\\"; *KvD$(ny
UpdateData(FALSE); c$ZVvu
} =^u;uS[IW
{ V6pC
void CCaptureDlg::SaveBmp() G~<UP(G
{ 0i_:J
CDC dc; klJ21j0Bb2
dc.CreateDC("DISPLAY",NULL,NULL,NULL); rT[qh+KWe
CBitmap bm; 2.z-&lFBZ
int Width=GetSystemMetrics(SM_CXSCREEN); qMJJB l
int Height=GetSystemMetrics(SM_CYSCREEN); 6E}9uwQ
bm.CreateCompatibleBitmap(&dc,Width,Height); (|^m9v0:
CDC tdc; b&F9<XLqq
tdc.CreateCompatibleDC(&dc); CfU|]<
CBitmap*pOld=tdc.SelectObject(&bm); 0mSP
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @Iz]:@\cJ
tdc.SelectObject(pOld); uTR^K=Ve
BITMAP btm; QnVr)4"
bm.GetBitmap(&btm); l@B9}Icq
DWORD size=btm.bmWidthBytes*btm.bmHeight; V,_m>$Mo
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )6)bI.BY
BITMAPINFOHEADER bih; pjFO0h_Y
bih.biBitCount=btm.bmBitsPixel; {3`385
bih.biClrImportant=0; 4=tR_s
bih.biClrUsed=0; 'vBZh1`p
bih.biCompression=0; $].htm
bih.biHeight=btm.bmHeight; D|9+:Y
bih.biPlanes=1; *(Dmd$|0|
bih.biSize=sizeof(BITMAPINFOHEADER); u)0I$Tc"
bih.biSizeImage=size; +\Vm t[v
bih.biWidth=btm.bmWidth; RHC ZP
bih.biXPelsPerMeter=0; mF*x&^ie
bih.biYPelsPerMeter=0; ~+dps i
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?+d`_/IB
static int filecount=0; U0_^6zd_
CString name; 06pvI}
name.Format("pict%04d.bmp",filecount++); _Ub
`\ytx
name=m_Path+name; !e|\1v'0
BITMAPFILEHEADER bfh; !B3TLeh
bfh.bfReserved1=bfh.bfReserved2=0; R (~wSL*R>
bfh.bfType=((WORD)('M'<< 8)|'B'); p'
>i3T(
bfh.bfSize=54+size; . ImaM
bfh.bfOffBits=54; cFL~<
[>_
CFile bf; ZkbE&7Z
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8v;^jo>ug
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));
BNK]Os
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); nzflUR{`-
bf.WriteHuge(lpData,size); h+g\tYWGP
bf.Close(); Z[. M>|
nCount++; o&q>[c
} E]`7_dG+T
GlobalFreePtr(lpData); }sXTZX
if(nCount==1) +x"uP
m_Number.Format("%d picture captured.",nCount); FRd"F$U
else ^AP8T8v
m_Number.Format("%d pictures captured.",nCount); X.t4;
UpdateData(FALSE); q?(]
Y*
} Y b+A{`
OT{"C"%5t
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *1dDs^D#|
{ ~ skp}g]
if(pMsg -> message == WM_KEYDOWN) hN-@_XSw<I
{ Py)ZHML
if(pMsg -> wParam == VK_ESCAPE) y"q
aa
return TRUE; 9"P|Csj
if(pMsg -> wParam == VK_RETURN) cl~Yx4
return TRUE; 8 t5kou]h
} 3"y 6|e/5
return CDialog::PreTranslateMessage(pMsg); jo`ZuN{
} s*izhjjX
g@`i7qN
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x}] 56f
{ Lzq/^&sc(
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [oLV,O|s|j
SaveBmp(); Y9+_MxC"
return FALSE; [qYr~:` -[
} R?xb1yc7_
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {OU|'
CMenu pop; {D+mr[ %
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _Iy\,<
CMenu*pMenu=pop.GetSubMenu(0); |YJ83nSO~
pMenu->SetDefaultItem(ID_EXITICON); _;1{feR_
CPoint pt; " 9Gn/-V>
GetCursorPos(&pt); NQ9v[gv
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "`vRHeCKN
if(id==ID_EXITICON) !/zRw-q3B
DeleteIcon(); "j^i6RS
else if(id==ID_EXIT) (
ayAP
OnCancel(); [?!I*=*b
return FALSE; 6}4})B2
} DP ? dC`
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Wq1>Bj$J8
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `3+i.wR
AddIcon(); g68p9#G
return res; )[Y B&
} mayJwBfU
lE:g A,
void CCaptureDlg::AddIcon() #oUNF0L@6
{ VeoG[Jl
NOTIFYICONDATA data; zCx4DN`
data.cbSize=sizeof(NOTIFYICONDATA); f9D e!"*&
CString tip; /)P}[Q4
tip.LoadString(IDS_ICONTIP); AYts
&+
data.hIcon=GetIcon(0); ]{>AU^=U
data.hWnd=GetSafeHwnd(); 7{;it uqX
strcpy(data.szTip,tip); ?"B]"%M&
data.uCallbackMessage=IDM_SHELL; ,lyW'<~gA
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xA] L0h]
data.uID=98; ]?Ef0?44
Shell_NotifyIcon(NIM_ADD,&data); &gXh:.
ShowWindow(SW_HIDE); 4QL>LK
bTray=TRUE; '%Ng lC[J
} AU{"G
fr@F7s5}
void CCaptureDlg::DeleteIcon() 9njwAKF?
{ !gsvF\XDM
NOTIFYICONDATA data; H];B?G';C
data.cbSize=sizeof(NOTIFYICONDATA); G-aR%]7$g
data.hWnd=GetSafeHwnd(); M+/xw8}a
data.uID=98; 'Uok<;
Shell_NotifyIcon(NIM_DELETE,&data); mB?x_6#d9
ShowWindow(SW_SHOW); .fA*WQ!lb
SetForegroundWindow(); %oZ:Awx
ShowWindow(SW_SHOWNORMAL); J$dwy$n
bTray=FALSE; D Ez,u^
} 25^?|9o 7
bF'rK'',
void CCaptureDlg::OnChange() -fR:W{u
{ ep0,4!#FAO
RegisterHotkey(); !IxO''4
} S{@}ECla
*XVwTW[a
BOOL CCaptureDlg::RegisterHotkey() MmuT~d/
{ kB\{1;
UpdateData(); E~'mxx~i
UCHAR mask=0; x(_[D08/TT
UCHAR key=0; K=g</@L6R
if(m_bControl) 8.E"[QktZ
mask|=4; gYpMwC{*d
if(m_bAlt) Ui{%q@
mask|=2; v3tJtb^'!
if(m_bShift) bOS)vt*V
mask|=1; MK$u}G
key=Key_Table[m_Key.GetCurSel()]; 'M90Yia
if(bRegistered){ sp9gz~Kq
DeleteHotkey(GetSafeHwnd(),cKey,cMask); J=4>zQLW
bRegistered=FALSE; PNU(;&2<
} E-e(K8R
cMask=mask; U84W(X
cKey=key; P]E-Wp'p
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j0jl$^
return bRegistered; gv#\}/->4
} Y+gY"
_T=g?0
q
四、小结 VFHd2Ea(
LF<&gC
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。