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:
wb}tN7~Y;
sR6(8 一、实现方法
181P;R=}< t`AD9
H"\! 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:
N ]duv~JS 1jL?z6S #pragma data_seg("shareddata")
1pV"<,t HHOOK hHook =NULL; //钩子句柄
R/#*~tPi8 UINT nHookCount =0; //挂接的程序数目
MWl@smRh static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
tT 7$2 9 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
iB?@(10}ES static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Bg`b*(Q static int KeyCount =0;
78%2#;;G static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8<^,<? #pragma data_seg()
6-3l6q Pc3u`Q L? 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。
[D t`@Dm BWs\'B 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:
rLwc=(| z'fS%uI BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
d|TIrlA cKey,UCHAR cMask)
UW+I 8\^ {
8X%;29tow BOOL bAdded=FALSE;
$\bH5|Hk] for(int index=0;index<MAX_KEY;index++){
@:[/uqL if(hCallWnd[index]==0){
nXN0~,+ hCallWnd[index]=hWnd;
eYa gI HotKey[index]=cKey;
;cO0Y.V9l HotKeyMask[index]=cMask;
>eC^]#c bAdded=TRUE;
bfJDF(=h KeyCount++;
/EC m break;
_ReQQti[ }
"K8qmggTq }
!-QKh aY return bAdded;
Rwr0$_A }
F4}Zl //删除热键
;#;X@BhS BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
gQ?k}D {
+o/q@&v;Ax BOOL bRemoved=FALSE;
$d"6y for(int index=0;index<MAX_KEY;index++){
6+It>mnR
if(hCallWnd[index]==hWnd){
~DJ/sY2/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
;'h7
j*6 hCallWnd[index]=NULL;
r=9*2X# HotKey[index]=0;
)S%mKdOm
$ HotKeyMask[index]=0;
t`LH\]6@ bRemoved=TRUE;
u7/M>YJ`T KeyCount--;
{[$p}#7Y break;
!B\\:k]aO^ }
G67BQG\av }
iz'8P-]K> }
dI>oHMC return bRemoved;
k@Hu0x }
&8;mcM//4 ENGw < &~k/G DLL中的钩子函数如下:
V=YK3){>A PY^Yx$t9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?FA:K0H?zl {
%B~`bUHjq BOOL bProcessed=FALSE;
SQeQ"k|P% if(HC_ACTION==nCode)
JK1b68n {
toQn]MT if((lParam&0xc0000000)==0xc0000000){// 有键松开
q)P<lKi switch(wParam)
U'\\(m| {
8^^al!0K~ case VK_MENU:
|6&"r& MaskBits&=~ALTBIT;
pG"
4qw break;
Ad"::&&Wk case VK_CONTROL:
b*bR<|dT j MaskBits&=~CTRLBIT;
-du+iOe? break;
J|ILG case VK_SHIFT:
DF|qNX MaskBits&=~SHIFTBIT;
eZUK<&0x5 break;
[X-Q{c4 default: //judge the key and send message
"aP/214Ul break;
2/;KZ+U& }
vj#gY2qZ for(int index=0;index<MAX_KEY;index++){
4
Hu+ljdjB if(hCallWnd[index]==NULL)
jReI+
pS continue;
eQ*gnV}rE% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/aK },+ {
!0w'S>e SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]03!KE bProcessed=TRUE;
Edjh* }
{L8SDU{P }
sG\=_-"v( }
4gYP .h:, else if((lParam&0xc000ffff)==1){ //有键按下
\>\w-ty[( switch(wParam)
onjTuZ^h {
\ ,?yj case VK_MENU:
o77HRX MaskBits|=ALTBIT;
'-
Z4GcL break;
|5O%@ case VK_CONTROL:
wi9fYfuv3R MaskBits|=CTRLBIT;
;B7>/q;g break;
Y(&phv& case VK_SHIFT:
$mpfr#!&3o MaskBits|=SHIFTBIT;
mX<D]Z< k break;
h IGa);g default: //judge the key and send message
H\O|Y@uVr break;
ZH.l^'(W }
TlAY=JwW for(int index=0;index<MAX_KEY;index++){
FVL0K(V( if(hCallWnd[index]==NULL)
|0m h*+i continue;
33-=Z9|r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>}_c<`: {
0p&:9|'z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
])0&el3- bProcessed=TRUE;
@4hxGk= }
7;c{lQOj} }
^8E/I]- }
'X{7b
< if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
F;`es%8 for(int index=0;index<MAX_KEY;index++){
)p ,-TtV if(hCallWnd[index]==NULL)
hoeOdWIpf continue;
i^="*t\i if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
, lT8gQ|u SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:9]23'Md //lParam的意义可看MSDN中WM_KEYDOWN部分
NIQa{R/H }
H=7dp%b" }
z_r W1?| }
rcNM,!dZ return CallNextHookEx( hHook, nCode, wParam, lParam );
^ !E;+o' t }
:P;#Y7}Y$ 21G]d 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:
W:hR81ci E$*I.i_m BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
&<k)W BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F0]= z- E70 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
NAHQ:$
9JP{F LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
6 3Kec {
^:LF if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
r'w5i1C+ {
b&V=X{V4 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*Cj]j- SaveBmp();
`Fu|50_@V return FALSE;
,T"(97" }
3p$ZHH.UP …… //其它处理及默认处理
Qa(u+
}
}+ I
8l' t55CT6Se 6R dfF$f 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。
';zLh E=HS'XKu[K 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。
I3s'44 i1 C]bUXA 二、编程步骤
I-&/]<5y Lp1wA* 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";
RhX
2qsva- TDy@Y>
) 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
oa1&9 l&U3jeW-o 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;
e Hd{'J< [uZU p*.V 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;
oKzV!~{0M; 3l<)|!f]g 5、 添加代码,编译运行程序。
st/Tb/ DlfXzKn; 三、程序代码
W >;AMun nolTvqMT ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
$(#o)r>_R #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
T|ZT&x$z #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
.oAg
(@^6 #if _MSC_VER > 1000
&=@R, #pragma once
(#\3XBG #endif // _MSC_VER > 1000
4$SW~BpQ #ifndef __AFXWIN_H__
]:m*7p\uk #error include 'stdafx.h' before including this file for PCH
- stSl* #endif
!Z<Z"R/ #include "resource.h" // main symbols
w[:5uo( class CHookApp : public CWinApp
ra$_#HY {
u\smQhQGE public:
[sACPn$f CHookApp();
8t9sdqM/C // Overrides
'xr\\Cd9s // ClassWizard generated virtual function overrides
:mL\KQ //{{AFX_VIRTUAL(CHookApp)
:t^=~xO9 public:
F2>o"j2 virtual BOOL InitInstance();
ls 'QfJm virtual int ExitInstance();
C@hnT<e //}}AFX_VIRTUAL
6Q>:g"_ //{{AFX_MSG(CHookApp)
'00DUUa // NOTE - the ClassWizard will add and remove member functions here.
Lu1>A {et // DO NOT EDIT what you see in these blocks of generated code !
LTBqXh //}}AFX_MSG
3_vggK% DECLARE_MESSAGE_MAP()
>(:KEA };
nb(#;3DQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
]
M_[*OAb BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
jk) V[7P BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4>$>XL1 BOOL InitHotkey();
oV,>u5:B BOOL UnInit();
g7_a8_ #endif
~ EE*/vX %C'!L]# //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
ctH`71Y #include "stdafx.h"
pZ OVD% #include "hook.h"
{lx^57v #include <windowsx.h>
4'G<qJoc #ifdef _DEBUG
Lr40rLx;u #define new DEBUG_NEW
|Z#)1K #undef THIS_FILE
3U1xKF static char THIS_FILE[] = __FILE__;
^9qncvV #endif
;l}TUo #define MAX_KEY 100
B@.U\. #define CTRLBIT 0x04
[rE,fR #define ALTBIT 0x02
TX*s T #define SHIFTBIT 0x01
{3
zq.e{ #pragma data_seg("shareddata")
EC?!%iO` HHOOK hHook =NULL;
sL+/Eeb` c UINT nHookCount =0;
/!jn$4fd: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
9QWS[E4 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
;t[<! static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
+#'exgGU^[ static int KeyCount =0;
a+r0@eFLc static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
;h0?o*i_ #pragma data_seg()
PNg, bcl HINSTANCE hins;
GS<,adD void VerifyWindow();
=Lp0i9c BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
^J@Y?CQl\ //{{AFX_MSG_MAP(CHookApp)
[8O`VSV3 // NOTE - the ClassWizard will add and remove mapping macros here.
vTP'\^; // DO NOT EDIT what you see in these blocks of generated code!
/$+ifiFT //}}AFX_MSG_MAP
:+!hR4Z~\; END_MESSAGE_MAP()
CO5?UgA 'DRyOJn r CHookApp::CHookApp()
O_KL#xo {
_oe2pL& // TODO: add construction code here,
B>|@XfPM // Place all significant initialization in InitInstance
]#+fQR$! }
3 T&m 0o(/%31] CHookApp theApp;
QJ>+!p* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
g0_8:Gs}^ {
jNrGsIY$ BOOL bProcessed=FALSE;
j/dNRleab if(HC_ACTION==nCode)
AGPZd9 {
!3?HpR/nV if((lParam&0xc0000000)==0xc0000000){// Key up
YuLW]Q?v switch(wParam)
Y
1LE.{ {
T9N /;3 case VK_MENU:
0u)]1 MaskBits&=~ALTBIT;
$p}7CP break;
>|uZIcs 6 case VK_CONTROL:
m|=/|Hm MaskBits&=~CTRLBIT;
el- %#0 break;
V4ayewVX case VK_SHIFT:
Gi ZyC MaskBits&=~SHIFTBIT;
8 :Z3Q break;
viY _Y.Yjy default: //judge the key and send message
Sf
lHSMFw break;
b _cD
>A }
<:>a51HBX for(int index=0;index<MAX_KEY;index++){
Jr
9\j3J{ if(hCallWnd[index]==NULL)
6S<J'9sE continue;
+<8r?d2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
e9N"{kDs6 {
&YqgMC SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
dM#\h*:= bProcessed=TRUE;
o!\Vk~Vi& }
~hYG% }
0j_`7<,: }
a|lcOU else if((lParam&0xc000ffff)==1){ //Key down
/u>")f switch(wParam)
om;jXf}A {
U6n%rdXJ= case VK_MENU:
vSPkm)O0) MaskBits|=ALTBIT;
/m.6NVu7 break;
co@Q case VK_CONTROL:
<_ddGg~ MaskBits|=CTRLBIT;
<|s|6C break;
vMj"% case VK_SHIFT:
~Ci|G3BW MaskBits|=SHIFTBIT;
nwHi3ojD: break;
Xxp<qIEm default: //judge the key and send message
h]vA%VuE'E break;
!);'Bk9o }
Ba6''?;G for(int index=0;index<MAX_KEY;index++)
([tbFI}A {
v#nYH?+~mJ if(hCallWnd[index]==NULL)
EcBSi995dj continue;
I tp7X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_z{:Q {
+hV7o!WxC SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
56d,Sk) bProcessed=TRUE;
$>]7NT P }
bC)diC }
"*XR'9~7 }
"qR
qEpD% if(!bProcessed){
"4oY F:h for(int index=0;index<MAX_KEY;index++){
Ej8EQ%P if(hCallWnd[index]==NULL)
>&Y8VLcK continue;
(lTM^3
} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7`|$uIM` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$Rd74;edn }
*|a_(bQ4@ }
-:AknQq }
*<"xF'C return CallNextHookEx( hHook, nCode, wParam, lParam );
Xr6UN{_- }
F{ B__Kf *:aJlvk BOOL InitHotkey()
aQ46euth {
Y(-4Agq if(hHook!=NULL){
Y!Wz7
C nHookCount++;
Mw*R~OX return TRUE;
/mo4Q?^ }
bAGQ else
7M=`Z{=9 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
2u/~#Rt&* if(hHook!=NULL)
+tES:3Pi nHookCount++;
.@gv}`> return (hHook!=NULL);
Y
u8a8p| }
nO,<`}pV BOOL UnInit()
_<yJQ|[z~i {
'k{pWfn=< if(nHookCount>1){
8{(;s$H~ nHookCount--;
}{ J<Wzw return TRUE;
g3Xq@RAJ c }
y4w{8;Mh BOOL unhooked = UnhookWindowsHookEx(hHook);
q 6%jCt2' if(unhooked==TRUE){
#\GWYWkR nHookCount=0;
ggzg,~V hHook=NULL;
$*\[I{Zau} }
Gp6|M2Vu_5 return unhooked;
Q]uxZ;}aF }
D[-V1K&g pGc_Klq BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:{E;*v_!v {
4ac2^` BOOL bAdded=FALSE;
-WWa`,: for(int index=0;index<MAX_KEY;index++){
Pa'g=- if(hCallWnd[index]==0){
WSz#g2a hCallWnd[index]=hWnd;
UpF,e>s HotKey[index]=cKey;
4@&8jZ)a HotKeyMask[index]=cMask;
kXFgvIpg< bAdded=TRUE;
t,gKN^P_ KeyCount++;
vSb$gl5H break;
K@)Hm\* }
w4\b^iJz }
Gc^w,n[E return bAdded;
d3v5^5kU }
KB0HM U3}r.9/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
O(2)A>} {
OlL
FuVR BOOL bRemoved=FALSE;
s5F,*< for(int index=0;index<MAX_KEY;index++){
D(yU:^L if(hCallWnd[index]==hWnd){
<7NY.zvwk] if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
d9^ uEz( hCallWnd[index]=NULL;
u0(H! HotKey[index]=0;
Ikv@}^p 7 HotKeyMask[index]=0;
Uo>pV9xRG bRemoved=TRUE;
80TSE* KeyCount--;
v9QR,b`n break;
pTT7#b(t }
9 +k7x, }
NokAP|<y }
zy"wQPEE return bRemoved;
;m`k#J? }
uH!uSB2 JKN0:/t7Q void VerifyWindow()
klmRU@D {
=~}\g;K1Q for(int i=0;i<MAX_KEY;i++){
KSe`G;{ if(hCallWnd
!=NULL){ P1tc*2Z
if(!IsWindow(hCallWnd)){ 5v
>0$Y{
hCallWnd=NULL; q,w8ca4~y
HotKey=0; r`Y[XzT9
HotKeyMask=0; M S$^m2
KeyCount--; R >f$*T
} 9.:r;H G
} E&ou(Q={
} @0H}U$l
} 1AiqB Rs
8@pY:AY
BOOL CHookApp::InitInstance() 3 (Bd`=9
{ `"`/_al^
AFX_MANAGE_STATE(AfxGetStaticModuleState()); xF![3~~3[
hins=AfxGetInstanceHandle(); 7DQ{#Gf#G
InitHotkey(); Z.TYi~d/9D
return CWinApp::InitInstance(); pxy=edd
} JG\T2/b
" |ZC2Zu<
int CHookApp::ExitInstance() `p0+j
{ ++=t|ZS
U
VerifyWindow(); ]Y@Db5S$T
UnInit(); Z3X/SQ'0
return CWinApp::ExitInstance(); y;aZMT.YI
} ,kS3Ioj
{8`V5:
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k@vN_Un
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) oRH]67(Z
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4JV/Ci5
#if _MSC_VER > 1000 /E8{:>2
#pragma once Jse;@K5y
#endif // _MSC_VER > 1000 CEbZj
z|
aly1=j
class CCaptureDlg : public CDialog 2IDN?Mw
{ 3<">1] /,
// Construction @)n xX))a
public: =*<Cw?Gc
BOOL bTray; Xo^P=uf%
BOOL bRegistered; 7:iTx;,v
BOOL RegisterHotkey(); t6m&+N
UCHAR cKey; {6}H}_(]
UCHAR cMask; \o}m]v
i
void DeleteIcon(); A9qbE
void AddIcon(); 5A^$!q P
UINT nCount; 3jH-!M5
void SaveBmp(); 3,;;C(
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Lso4ZZ;
// Dialog Data i~1bfl
//{{AFX_DATA(CCaptureDlg) Fb8~2N"3
enum { IDD = IDD_CAPTURE_DIALOG }; wNQhz.>y
CComboBox m_Key; sv}k_6XgY
BOOL m_bControl; ?VUW.-
BOOL m_bAlt; b/^i
BOOL m_bShift; mIk8hA@B_
CString m_Path; D3,9X#B=
CString m_Number; ,gY bi-E
//}}AFX_DATA ICq
// ClassWizard generated virtual function overrides l6kq P
//{{AFX_VIRTUAL(CCaptureDlg) )g;*u,C
public: {DfXn1Cg0U
virtual BOOL PreTranslateMessage(MSG* pMsg); YS$42J_T
protected: &?[uY5Mk
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <WPLjgtn3
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); m[l[yUw#
//}}AFX_VIRTUAL 8nKZ
// Implementation z _A]mJ
protected: 04npY+1
8%
HICON m_hIcon; J9buf}C[
// Generated message map functions xb6y=L
//{{AFX_MSG(CCaptureDlg) xhq-$"B
virtual BOOL OnInitDialog(); 0 Z{;sW
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |/!3 N
afx_msg void OnPaint(); c-s A?q#|
afx_msg HCURSOR OnQueryDragIcon(); qpjG_G5/
virtual void OnCancel(); 2X<%BFsE
afx_msg void OnAbout(); Xp] jF^5
afx_msg void OnBrowse(); u^G Y7gah
afx_msg void OnChange(); m]vS"AdX
//}}AFX_MSG j]FK.G'
DECLARE_MESSAGE_MAP() @DIEENiM
}; eTFep^[
#endif /ej[oR
wVqp')e
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &?1O D5
#include "stdafx.h" 4Q/{lqG
#include "Capture.h" CuD}Uo+u
#include "CaptureDlg.h" IU<lF) PF$
#include <windowsx.h> dQ:F 5|p
#pragma comment(lib,"hook.lib") m}u)C&2>
#ifdef _DEBUG D2g/P8.<A
#define new DEBUG_NEW NT0n[o^
#undef THIS_FILE .%y'q!?
static char THIS_FILE[] = __FILE__; Fgi`g{N
#endif WW.@S5
#define IDM_SHELL WM_USER+1 5x%Blkx
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m%
3 D
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F~i ~%f,
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j g//I<D
class CAboutDlg : public CDialog gROK4'j6y
{ Q5ff&CE
public: >s 6ye
CAboutDlg(); ' Ut4=@)
// Dialog Data d&CpaOSu
//{{AFX_DATA(CAboutDlg) q\}+]|nGs
enum { IDD = IDD_ABOUTBOX }; O^3kPVr
//}}AFX_DATA p J_+n:_{
// ClassWizard generated virtual function overrides 8q%y(e
//{{AFX_VIRTUAL(CAboutDlg) z~X/.>
protected: 5wmd[YL
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,[IDC3.4^R
//}}AFX_VIRTUAL lyX3'0c
// Implementation }^iqhUvT F
protected: BGBHA"5fz
//{{AFX_MSG(CAboutDlg) j{YYG|
//}}AFX_MSG CxeW5qc
DECLARE_MESSAGE_MAP() aUzCKX%>C
}; DrKB;6
"5Y6.$Cuf!
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ('SId@
{ ?*yyne
//{{AFX_DATA_INIT(CAboutDlg) (z>t 4(%\
//}}AFX_DATA_INIT R?O)vLmd
} 6IG?t
Kc?4q=7q
void CAboutDlg::DoDataExchange(CDataExchange* pDX) YO .+-(
{ 8k95IJR1
CDialog::DoDataExchange(pDX); 5gtf`ebs/
//{{AFX_DATA_MAP(CAboutDlg) RzjUrt
//}}AFX_DATA_MAP l>}f{az-T
} <BED&j!qvP
R__:~uv,
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }1e4u{
//{{AFX_MSG_MAP(CAboutDlg) v8*)^-Fx
// No message handlers kFwFPK%B
//}}AFX_MSG_MAP E{&MmrlL,
END_MESSAGE_MAP() .a]#AFX
-1,0hmn=+
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /V:9*C
: CDialog(CCaptureDlg::IDD, pParent) [K.1 X=O}
{ Q}|K29Y:p
//{{AFX_DATA_INIT(CCaptureDlg) 3y6\0|{1
m_bControl = FALSE; /W$i8g
m_bAlt = FALSE; =&} _bd/]
m_bShift = FALSE; /j$=?Rp
m_Path = _T("c:\\"); D<;~eZ'
m_Number = _T("0 picture captured."); 8^>c_%e}
nCount=0; l P3|h*
bRegistered=FALSE; Si>38vCJ*
bTray=FALSE; VFL^-tXnA^
//}}AFX_DATA_INIT "vSKj/]
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 NC%hsg^0/
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OALNZKP
} x_nwD"
WJOoDS!i
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (MI>7| ';
{ \4q|Qno8
CDialog::DoDataExchange(pDX); qK a}O*
//{{AFX_DATA_MAP(CCaptureDlg) GYfOwV!zB
DDX_Control(pDX, IDC_KEY, m_Key); [|OII!"
DDX_Check(pDX, IDC_CONTROL, m_bControl); P[WkW#
DDX_Check(pDX, IDC_ALT, m_bAlt); \~l_w
,Poo
DDX_Check(pDX, IDC_SHIFT, m_bShift); `SFeln{1B
DDX_Text(pDX, IDC_PATH, m_Path); <ToBVGX
DDX_Text(pDX, IDC_NUMBER, m_Number); Lj3o-@\*j
//}}AFX_DATA_MAP h6
{vbYj
} Nv7-6C6<
}+9?)f{?@
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) FAEF
//{{AFX_MSG_MAP(CCaptureDlg) ]8\I{LR
ON_WM_SYSCOMMAND() s2{SbOBis
ON_WM_PAINT() Ev5~= ]
ON_WM_QUERYDRAGICON() LigB!M
ON_BN_CLICKED(ID_ABOUT, OnAbout) fz=?QEG
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /RxP:>hVv
ON_BN_CLICKED(ID_CHANGE, OnChange) '\I(n|\
//}}AFX_MSG_MAP 2+gbMd4n
END_MESSAGE_MAP() cRVL1ne
. ,^WCyvq
BOOL CCaptureDlg::OnInitDialog() m!/TJhiQ
{ 2bNOn%!
CDialog::OnInitDialog(); Cf=H~&`Z
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [i`
ASSERT(IDM_ABOUTBOX < 0xF000); LpU}.
CMenu* pSysMenu = GetSystemMenu(FALSE); Q v9q~l
if (pSysMenu != NULL) =0=#M(w
{ q@ -B+
CString strAboutMenu; P C_!
strAboutMenu.LoadString(IDS_ABOUTBOX); 'w+]kt-
if (!strAboutMenu.IsEmpty()) 'dwT&v]@
{ A)&FcMO*z
pSysMenu->AppendMenu(MF_SEPARATOR); s$R /!,c
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [Cl0Kw.LD
} JpC'(N
} 7y'":1
SetIcon(m_hIcon, TRUE); // Set big icon >ou=}/<
SetIcon(m_hIcon, FALSE); // Set small icon ?{S>%P A_B
m_Key.SetCurSel(0); .>B'oD
RegisterHotkey(); 2!^=G=H/
CMenu* pMenu=GetSystemMenu(FALSE); ! I@w3`
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); by@KdQow
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ST*h{:u&A
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); );gY8UL^
return TRUE; // return TRUE unless you set the focus to a control }csA|cC
} W[8Kia-OD
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void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) y|5s
{ r)iEtT!p*
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~T1W-ig4[*
{ MxsLrWxm
CAboutDlg dlgAbout; (F4e}hr&
dlgAbout.DoModal(); xnY?<?J"!
} $Z@*!B^
else ?G,4N<]Nu
{ qT$k%(
CDialog::OnSysCommand(nID, lParam); :\OSHs<M
} q-JTGCFl
} #d-({blo<
o+a=
void CCaptureDlg::OnPaint() ~rb0G*R>
{ P8d
if (IsIconic()) 7ftn
gBv?
{ ,9P-<P
CPaintDC dc(this); // device context for painting U**8^:*y#:
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "6f`hy
// Center icon in client rectangle m-AF&( ;K
int cxIcon = GetSystemMetrics(SM_CXICON); x0
)V
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int cyIcon = GetSystemMetrics(SM_CYICON); "I.6/9
CRect rect; DK IH{:L7
GetClientRect(&rect); F0:]@0>r
int x = (rect.Width() - cxIcon + 1) / 2; aA`eKy) \
int y = (rect.Height() - cyIcon + 1) / 2; v~nKO?{
// Draw the icon E\[B E<y
dc.DrawIcon(x, y, m_hIcon); 3oCI1>k
} o1.~g'!^
else 4D?h}U /
{ g3tE.!a5-
CDialog::OnPaint(); w]wZJ/U`
} {"ST
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} )eyzHB,H
*dBeb
HCURSOR CCaptureDlg::OnQueryDragIcon() Fz7t84g(
{ Q|(}rIWOQA
return (HCURSOR) m_hIcon; *7!MG
} ],]Rv#`
fkxkf^g)
void CCaptureDlg::OnCancel() 1q}LO2
{ hFIh<m=C?Y
if(bTray) h*S"]ye5
DeleteIcon(); V?{d<Ng~J
CDialog::OnCancel(); .vu7$~7
} uavATnGO{B
b"I#\;Ym
void CCaptureDlg::OnAbout() .|,LBc!
{
UleT9 [M
CAboutDlg dlg; ;+ hh|NiQ
dlg.DoModal(); cE\w6uBR1
} 6FB0g8
-"[4E0g0
void CCaptureDlg::OnBrowse() z$1RD)TQB
{ (?qCtLZ
CString str; 'Ea3(OsuXn
BROWSEINFO bi; ^#_gk uyd!
char name[MAX_PATH]; #/G!nN #
ZeroMemory(&bi,sizeof(BROWSEINFO)); %K Q1{"
bi.hwndOwner=GetSafeHwnd(); lx`?n<-X
bi.pszDisplayName=name; -nb U5o
bi.lpszTitle="Select folder"; b<a3Ue%
bi.ulFlags=BIF_RETURNONLYFSDIRS; KXPCkNIN!
LPITEMIDLIST idl=SHBrowseForFolder(&bi); yq~
if(idl==NULL) IL@yGuO,
return; u3h(EAH>
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); o-<i+ To%
str.ReleaseBuffer(); Za@\=}Tt
m_Path=str; o]?
yyP
if(str.GetAt(str.GetLength()-1)!='\\') \]x`f3F
m_Path+="\\"; DI0& _,
UpdateData(FALSE); | R,dsBd
} iA[T'+.Y
0}i
9`p
void CCaptureDlg::SaveBmp() Z!v,;MW
{ C
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CDC dc; *"^X)Y{c+l
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2-F7tcya|
CBitmap bm; 8r(Vz
int Width=GetSystemMetrics(SM_CXSCREEN); ?wtKi#k'v#
int Height=GetSystemMetrics(SM_CYSCREEN); 48p3m)5
bm.CreateCompatibleBitmap(&dc,Width,Height); ev&l=(hY
CDC tdc; SlsNtaNt
tdc.CreateCompatibleDC(&dc); 7] y3<t
CBitmap*pOld=tdc.SelectObject(&bm); ,.Gp_BI
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); br\3}
tdc.SelectObject(pOld); wU%uO/sU9
BITMAP btm; {tVA(&\<
bm.GetBitmap(&btm); 2?,lr2
DWORD size=btm.bmWidthBytes*btm.bmHeight; <(E)M@2
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3n2^;b/ ]
BITMAPINFOHEADER bih; VmQ^F|
{
bih.biBitCount=btm.bmBitsPixel; +9HU&gQ3
bih.biClrImportant=0; ZPf&4#|
bih.biClrUsed=0; Pr>$m{
Z
bih.biCompression=0; QmBHD;Gf
bih.biHeight=btm.bmHeight; j Hq+/\
bih.biPlanes=1; -dMH>e0
bih.biSize=sizeof(BITMAPINFOHEADER); P#pb48^-
bih.biSizeImage=size; HtN:v
bih.biWidth=btm.bmWidth; 8h
ol4'B
bih.biXPelsPerMeter=0; <_/etw86Z
bih.biYPelsPerMeter=0; DvWBvs,
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0Cc3NNdz
static int filecount=0; #8d#Jw
CString name; `@Z$+
name.Format("pict%04d.bmp",filecount++); #W:.Fsq
name=m_Path+name; NiG&Lw*8
BITMAPFILEHEADER bfh; -/8V2dv3
bfh.bfReserved1=bfh.bfReserved2=0; %~eu&\os
bfh.bfType=((WORD)('M'<< 8)|'B'); 8?~>FLWTXZ
bfh.bfSize=54+size; $jk4H+H-
bfh.bfOffBits=54; zRh)q,Dt
CFile bf; j\#)'>"
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &IQNsJL!e
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3meZ]u
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Njo.-k
bf.WriteHuge(lpData,size); H(
LK}[
bf.Close(); %5ov!nm7
nCount++; 7\dt<VV
} T&dc)t`o
GlobalFreePtr(lpData); 6hcs)X7m
if(nCount==1) $1X!Ecq_
m_Number.Format("%d picture captured.",nCount); m%U=:u7#M
else =)#XZ[#F
m_Number.Format("%d pictures captured.",nCount); 0>,i]
|Y
UpdateData(FALSE); *<9M|H~
} y] Q/(O
HELTL$j,b
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z#5qI',L
{ _J>Ik2EF
if(pMsg -> message == WM_KEYDOWN) I/h( *~/
{ Nj;(QhYZ
if(pMsg -> wParam == VK_ESCAPE) T5[(vTp
return TRUE; q:_-#u
if(pMsg -> wParam == VK_RETURN) H2_6m5[&,
return TRUE; +5ql`C
} H8c -/
return CDialog::PreTranslateMessage(pMsg); "t{D5{q|[k
} 4YMUkwh
8LtkP&Wx
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [c>YKN2qa
{ voN, u>U
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ CwF=@:*d
SaveBmp(); `yXHb
return FALSE; f+Bv8 g
} CfLPs)\ACm
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M4XU*piz
CMenu pop; )q+;+J`>
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Yu9(qRK
CMenu*pMenu=pop.GetSubMenu(0); xqVIw!J?/}
pMenu->SetDefaultItem(ID_EXITICON); EU7mP
MxJ
CPoint pt; ~:A=o?V2
GetCursorPos(&pt); g dBH\K (\
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0Q/BTT%X
if(id==ID_EXITICON) 9(9\kQj{C
DeleteIcon(); w##$SaTI
else if(id==ID_EXIT) &ZPyZj
OnCancel(); }!vJ+
return FALSE; ma2-66M~j
} |P=-m-W
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $Jy1=/W&
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /9u12R*<
AddIcon(); =
:\o/)+
return res; a/
Z\h{*
} n ^C"v6X
/`B:F5r
void CCaptureDlg::AddIcon() v+2t;PJd2
{ ]OA8H[U-eA
NOTIFYICONDATA data; (^Hpe5h&
data.cbSize=sizeof(NOTIFYICONDATA); z/S}z4o/
CString tip; bu r0?q
tip.LoadString(IDS_ICONTIP); &qFy$`"
data.hIcon=GetIcon(0); t'Pn*
data.hWnd=GetSafeHwnd(); =I9RM9O<
strcpy(data.szTip,tip); 7pz #%Hf
data.uCallbackMessage=IDM_SHELL; sZPA(N?
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F| O
data.uID=98; e/!xyd
Shell_NotifyIcon(NIM_ADD,&data); d#3E'8
ShowWindow(SW_HIDE); 1A\N$9Dls
bTray=TRUE; Zut"P3d=J
}
U>
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@ * *]o
void CCaptureDlg::DeleteIcon() L Z#SX5N
{ O9 [Dae{i
NOTIFYICONDATA data; eB*0})
data.cbSize=sizeof(NOTIFYICONDATA); B=+Py%
data.hWnd=GetSafeHwnd(); _ye74$#
data.uID=98; NXDuO_#
Shell_NotifyIcon(NIM_DELETE,&data); zH+a*R
ShowWindow(SW_SHOW); 3 At%TA:
SetForegroundWindow(); %FO#j 6
ShowWindow(SW_SHOWNORMAL); Tf?|*P
bTray=FALSE; 3It9|Y"6[
} 'e06QMp@
C.;H?So(
void CCaptureDlg::OnChange() c'~6 1HA<
{
UB1/0o
RegisterHotkey(); La'XJ|>V
} =Smd/'`_
4"@;.C""
BOOL CCaptureDlg::RegisterHotkey() UK,bfLPt~
{ zH~P-MqC
UpdateData(); {A==av
UCHAR mask=0; oW^x=pS9
UCHAR key=0; U^KWRqt
if(m_bControl) fof}I:vO
mask|=4; fYPu%MN7
if(m_bAlt) Z5TA4Q+Q
mask|=2; = vqJ0 !
if(m_bShift) t|'%0 W
mask|=1; 4}DFCF%B
key=Key_Table[m_Key.GetCurSel()]; A4,%l\di<
if(bRegistered){ {v0r'+`
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9~`#aQG T
bRegistered=FALSE; D4c'6WGb@
} P@@MQ[u?!.
cMask=mask; j-BNHX
cKey=key; K W&muD
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eikZ~!@
return bRegistered; *=oO3c0|b,
} YT?Lt!cl=
EHq;eF
四、小结 Q
jywS<9c@
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。