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:
_5K_YhT
={b
]
一、实现方法
~c="<xBE z^Jl4V 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:
b$
x"&& ~`})x(! #pragma data_seg("shareddata")
X<m%EXvV HHOOK hHook =NULL; //钩子句柄
xk*3,J6BK UINT nHookCount =0; //挂接的程序数目
!Q(xOc9>Ug static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
}g*-Ty static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@*uX[) static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
QB.'8B_ static int KeyCount =0;
{''|iwLr static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
vaf9b}FL #pragma data_seg()
YT5>pM-% 4'd{H
Rs 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。
#LN
I&5 5i/E=D 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:
-PnC^r0L$ HEuM"2{DMM BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*3/7wSV: cKey,UCHAR cMask)
Hr+-ndH!Pq {
VBX#
!K1Q BOOL bAdded=FALSE;
`es($7}P_W for(int index=0;index<MAX_KEY;index++){
[[e |GQ if(hCallWnd[index]==0){
3opLLf_g hCallWnd[index]=hWnd;
b66X])+4jE HotKey[index]=cKey;
//
}8HY)> HotKeyMask[index]=cMask;
4v|/+J6G bAdded=TRUE;
:xw3b)KS KeyCount++;
I:e2sE
": break;
f)zg&Ib }
F3Y>hs):7 }
&
.?HuK return bAdded;
BY0|exW }
YSV,q@I&1 //删除热键
?&"^\p BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}x.)gW {
5|R2cc|"9 BOOL bRemoved=FALSE;
q`aY.dD=O for(int index=0;index<MAX_KEY;index++){
y@M}T{,/ if(hCallWnd[index]==hWnd){
3\KII9 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<c ovApx hCallWnd[index]=NULL;
~}5Ml_J$,l HotKey[index]=0;
h6h1.lZ HotKeyMask[index]=0;
u3wC}Zo bRemoved=TRUE;
;-?ZI$ KeyCount--;
{}pqxouE break;
kppRQ Q*[ }
+?iM$}8!U }
~+#--BhV }
?*'$(}r3 return bRemoved;
,8IAhQa }
qP"JNswI_ X[Ek'=} be:phS4vz DLL中的钩子函数如下:
M_1Tx , Ln
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@LKG\zYBu {
_g 4/% BOOL bProcessed=FALSE;
<8)s if(HC_ACTION==nCode)
F36ViN\b {
yb{Q, Dz if((lParam&0xc0000000)==0xc0000000){// 有键松开
=$8@JF' switch(wParam)
[S]!+YBK {
}IN_5o(( case VK_MENU:
{TncqA MaskBits&=~ALTBIT;
5!ubY
6Ph break;
HJ qQlEq case VK_CONTROL:
z"K(
bw6 MaskBits&=~CTRLBIT;
q{GSsDo-:V break;
JYd7@Msfc case VK_SHIFT:
b;L>%; MaskBits&=~SHIFTBIT;
v1r_Z($ break;
)_v\{N default: //judge the key and send message
)@qup _M@ break;
*e<Eu>fW#& }
fcICFReyV for(int index=0;index<MAX_KEY;index++){
5$oewjLO if(hCallWnd[index]==NULL)
^ MT9n continue;
<{/;1Dru if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ch>Vv"G> {
lV<Tsk' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
20VVOnDY bProcessed=TRUE;
yIIETE }
oM<!I0"gC+ }
A*;?U2 }
_E6}XNS else if((lParam&0xc000ffff)==1){ //有键按下
o}=. switch(wParam)
ufCqvv>' {
u:k:C case VK_MENU:
^%8qKC`Tt MaskBits|=ALTBIT;
y-# break;
xb>n&ym? case VK_CONTROL:
b(RBG MaskBits|=CTRLBIT;
0[lsoYUq break;
rQEi/ case VK_SHIFT:
:wU_-{>>2 MaskBits|=SHIFTBIT;
ESMG<vW&f break;
*J_iXu| default: //judge the key and send message
'e]HP-Y< break;
@ EmGexLPM }
G*\abL for(int index=0;index<MAX_KEY;index++){
ZCQ<%f if(hCallWnd[index]==NULL)
90s;/y( continue;
"#twY|wW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Cqgk {
|rFR8srPG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9k:W1wgH1 bProcessed=TRUE;
/zG+] }
f<89$/w }
^Cg^`n?@b }
e3eVvl5] if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ejklpa ./ for(int index=0;index<MAX_KEY;index++){
$(gGoL< if(hCallWnd[index]==NULL)
uuSR%KK]| continue;
1OJ*wI* if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|mxNUo- SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
3Q"F(uE v^ //lParam的意义可看MSDN中WM_KEYDOWN部分
.G}k/`a }
RzS|dGNQE }
bar0{!Y" }
st?gA"5w return CallNextHookEx( hHook, nCode, wParam, lParam );
7qg<[ }
$;Vc@mYGW; i3Hz"Qs; 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
fw' r. MBB5wj BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
lwOf)jK:J BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
s>|Z7[* 9g
Bjxqm 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
3;a
R\:p@w Xsd$*F@< LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
\+k, :8s/ {
^/>Wr'w if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
l"J*)P {
6F`qi:a+ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
YwL`>? SaveBmp();
pe()f/Jx( return FALSE;
TMJ9~"IO }
)N(9pnyZH …… //其它处理及默认处理
(kIz }
pI7Ssvi^ y" ^yYO Di*]ab 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。
|gnAqkW0 n%/i:Whs 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。
4'SaEsA~ NZLXN 二、编程步骤
2sKG(^=Z .^i<xY 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";
XRa(sXA3 pW\z\o/2 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
4\M8BRuE *URdd,){i 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;
eZg$AOpU L[9OVD 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
iTh
xVD P##Z[$IJ3 5、 添加代码,编译运行程序。
#?9Q{0e uBmxh%]C~ 三、程序代码
bV@7mmz:X+ Wo{K} ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
0G5'Y;8 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
:pwa{P #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
|;P^clS3 #if _MSC_VER > 1000
8xgJSk #pragma once
'61i2\[lZQ #endif // _MSC_VER > 1000
91up^ #ifndef __AFXWIN_H__
u4YM^* S. #error include 'stdafx.h' before including this file for PCH
&Yp+k}XU #endif
q7,^E`5EgU #include "resource.h" // main symbols
<_9!
class CHookApp : public CWinApp
s~^*+kq {
6xHi\L public:
:zlpfm2 CHookApp();
`(!NYx // Overrides
j 1(T )T // ClassWizard generated virtual function overrides
*>k!hq;j //{{AFX_VIRTUAL(CHookApp)
$A`xhh[ public:
EX:{EmaT virtual BOOL InitInstance();
W,3zL.qH" virtual int ExitInstance();
lEHwZ<je //}}AFX_VIRTUAL
/xySwSmh3 //{{AFX_MSG(CHookApp)
3 > |uF // NOTE - the ClassWizard will add and remove member functions here.
3 jF|Ic // DO NOT EDIT what you see in these blocks of generated code !
-#aZF2z //}}AFX_MSG
&]< 3~6n DECLARE_MESSAGE_MAP()
O)uOUB };
66Gx.tE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
(SF1y/g@= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
asr=m{C" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
R2 lXTW* BOOL InitHotkey();
|5,<jyp BOOL UnInit();
>
\3ah4"o #endif
&~#iIk~% D`VFf\7 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Vclr2]eV4O #include "stdafx.h"
EMlIxpCn: #include "hook.h"
%c X"#+e #include <windowsx.h>
>,"sHm}l% #ifdef _DEBUG
+I52EXo #define new DEBUG_NEW
Vl<9=f7[ #undef THIS_FILE
)11W)G`w static char THIS_FILE[] = __FILE__;
QR"bYQ #endif
;/'|WLI9 #define MAX_KEY 100
=Vb~s+YW #define CTRLBIT 0x04
,
T\- ;7 #define ALTBIT 0x02
&>(gt<C$ #define SHIFTBIT 0x01
T%(C-Quh #pragma data_seg("shareddata")
\"x>JW4w HHOOK hHook =NULL;
sTkkM9 UINT nHookCount =0;
/L&M,OUcr. static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
X|b2c+I static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Oz{%k#X- static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Qz+sT6js- static int KeyCount =0;
NZk&JND static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]JjK#eh #pragma data_seg()
:.uk$jx HINSTANCE hins;
J02^i5l void VerifyWindow();
,Ff n)+ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
gn ?YF` //{{AFX_MSG_MAP(CHookApp)
J}TfRrf // NOTE - the ClassWizard will add and remove mapping macros here.
B
+Aj*\Y. // DO NOT EDIT what you see in these blocks of generated code!
J8<J8x4 //}}AFX_MSG_MAP
_D,eyP9P END_MESSAGE_MAP()
5mgHlsDzu y-B=W]E CHookApp::CHookApp()
+=eR%|!@ {
51 b y // TODO: add construction code here,
+Ok%e.\ZM // Place all significant initialization in InitInstance
6|!NLwa }
{38\vX,I(w |g-b8+.=] CHookApp theApp;
e1/sqXWo LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%8mm Hh {
+E5=$` BOOL bProcessed=FALSE;
h*w6/ZL1 if(HC_ACTION==nCode)
i sW\MB] {
sJZ!sznn if((lParam&0xc0000000)==0xc0000000){// Key up
8TWTbQ switch(wParam)
CQ^3v09N;~ {
^jD1vUL 2: case VK_MENU:
v`DI<Lt MaskBits&=~ALTBIT;
\+nGOvM break;
3`F) AWzdr case VK_CONTROL:
=Z,5$6%) MaskBits&=~CTRLBIT;
M#,Q
^rH# break;
j6g@tx^)' case VK_SHIFT:
8=;k" MaskBits&=~SHIFTBIT;
WE6\dhJ< break;
}Ln@R~[ default: //judge the key and send message
^Q.,\TL01 break;
L{8;Ud_2r }
$_D6_|HK for(int index=0;index<MAX_KEY;index++){
6f)2 F<
7 if(hCallWnd[index]==NULL)
HpW 42 continue;
SVWIEH0? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$t/rOo9cV {
9&Ne+MY^% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
d]wD[] bProcessed=TRUE;
86qI }
u\1>gDI )| }
H !)=y }
<
<Y}~N else if((lParam&0xc000ffff)==1){ //Key down
+K~NV?c switch(wParam)
^,8R,S\}$ {
Bh]!WMAw. case VK_MENU:
'Ot,H_pE MaskBits|=ALTBIT;
a|_p,_ break;
~i~%~doa case VK_CONTROL:
@jy41eIo MaskBits|=CTRLBIT;
K#mOSY;} break;
\7v)iG|#G& case VK_SHIFT:
QM<y`cZ8 MaskBits|=SHIFTBIT;
.Y*f2A.v break;
},@^0UH4c default: //judge the key and send message
Ykqyk')wm break;
7 sFz?`- }
y$W|~ H for(int index=0;index<MAX_KEY;index++)
V@vU" {
)3A{GZj#6 if(hCallWnd[index]==NULL)
BiwieF4x continue;
!mJo'K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X/0v'N {
qu|i;WZE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,h]o> bProcessed=TRUE;
'UU\4M }
e}yX_Z'P< }
Vw{*P2v) }
g);^NAA if(!bProcessed){
hJ;$A*Y for(int index=0;index<MAX_KEY;index++){
EbY,N:LK if(hCallWnd[index]==NULL)
'gMfN continue;
]wVk+%e if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
YT#3n SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]lO h&Cz[ }
/+]s.V. }
jXg }
BJ}D%nm} return CallNextHookEx( hHook, nCode, wParam, lParam );
P9Q~r<7n }
!CTxVLl"F J([s5:.[ BOOL InitHotkey()
Z|lU8`'5 {
s1N?/>lmB if(hHook!=NULL){
t=
#&fSR nHookCount++;
=EP13J return TRUE;
9xI GV! }
zYER else
lSwcL hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,:Z^$ if(hHook!=NULL)
O[^%{' nHookCount++;
oqd;6[%G return (hHook!=NULL);
_qwQ;!9 }
;,h/
BOOL UnInit()
%ysZ5:X {
CY:d`4 if(nHookCount>1){
~uWOdm-"[ nHookCount--;
13k
!'P return TRUE;
!^oV # }
g|X ;ahTT BOOL unhooked = UnhookWindowsHookEx(hHook);
friWW^ if(unhooked==TRUE){
1c4/}3* nHookCount=0;
DOS0;^f hHook=NULL;
0|4%4Mt }
hwYQGtjF return unhooked;
H6*^Ga }
H`hnEOyLp DTRJ/@t BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1Na@|yY {
/6uT6G+(z} BOOL bAdded=FALSE;
"I6P=]|b for(int index=0;index<MAX_KEY;index++){
/*FH:T<V if(hCallWnd[index]==0){
uA tV". hCallWnd[index]=hWnd;
d[^KL;b?6 HotKey[index]=cKey;
z4%uN|V HotKeyMask[index]=cMask;
ipnV$!z bAdded=TRUE;
HAz By\M{ KeyCount++;
2jJmE&)7, break;
s9;#!7ms }
6 gL=u-2 }
Rk<@?(l!6x return bAdded;
E51dV:l }
}_/Hdmmx kl!wVLE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
p@!nYPr. {
Z%zj";C
G BOOL bRemoved=FALSE;
AN:sQX` for(int index=0;index<MAX_KEY;index++){
!%+2Yifna if(hCallWnd[index]==hWnd){
2,2Z`X if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
t.8 GT&p hCallWnd[index]=NULL;
}U ~6^2 ., HotKey[index]=0;
}"vW4 HotKeyMask[index]=0;
vy2Q g
bRemoved=TRUE;
Y`7~Am/r;& KeyCount--;
j`'`)3f break;
T3UMCqc= }
zLs|tJOVp }
: JzI>/ }
,j;m!V return bRemoved;
)UgX3+@ }
(s<Dd2&.H ;7]u!Q void VerifyWindow()
5,qj7HZF {
RpWTpT1 for(int i=0;i<MAX_KEY;i++){
'|]e<Mt- if(hCallWnd
!=NULL){ Q)m4_+,d
if(!IsWindow(hCallWnd)){ ?&G`{Ey
hCallWnd=NULL; E1dD7r\
HotKey=0; ^'CPM6J
HotKeyMask=0; Xp\/YJOibd
KeyCount--; OMhef,,H
} h^,8rd
} 4%4avEa"w
} (fNUj4[
} v 8T$ &-HJ
'w>_+jLT
BOOL CHookApp::InitInstance() 0nn okN^
{ mpAR7AG6
AFX_MANAGE_STATE(AfxGetStaticModuleState()); W>r#RXmh
hins=AfxGetInstanceHandle(); ?]fF3 SJk
InitHotkey(); hT$~ygQ
return CWinApp::InitInstance(); H9h@ sSg
} IEKU-k7}Z
!TZhQiorC
int CHookApp::ExitInstance() U~h'*nV&
{ xq-17HKs
VerifyWindow(); 7^wc)E^H
UnInit(); ~!s-o|N_\
return CWinApp::ExitInstance(); $vHU$lZ/W
} Zfk*HV#\
\k;`}3uO
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s]m o$ _na
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) R>DaOH2K*
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (8v7|Pe8
#if _MSC_VER > 1000 w%WF-:u7|
#pragma once Q-ni|
#endif // _MSC_VER > 1000 kKD`rfyG\
#-pc}Y|<
class CCaptureDlg : public CDialog 7g
R@$(1Z
{ hjaT^(Y
// Construction .s#;s'>g
public: 1h6^>()^
BOOL bTray; 6x"Q
BOOL bRegistered; a+hd(JX0~
BOOL RegisterHotkey(); ,Jc m+Wb
UCHAR cKey; `cPywn@uGZ
UCHAR cMask; REZJ}%}/
void DeleteIcon(); S3L~~X/=
void AddIcon(); obdFS,JxxG
UINT nCount; [
W2fd\4
void SaveBmp(); 91Uj}n%
CCaptureDlg(CWnd* pParent = NULL); // standard constructor KD/V aN
// Dialog Data pF
^#}L
//{{AFX_DATA(CCaptureDlg) #cj6{%c4
enum { IDD = IDD_CAPTURE_DIALOG }; c/B'jPt
CComboBox m_Key; SyAvKd`g
BOOL m_bControl; /C/id)h>
BOOL m_bAlt; jiF?fX@
BOOL m_bShift; J=pztASt
CString m_Path; _qbIh
CString m_Number; -n'F v@U
//}}AFX_DATA dw.F5?j`b
// ClassWizard generated virtual function overrides S1D@vnZ3O\
//{{AFX_VIRTUAL(CCaptureDlg) nXjPx@
public: ]f]<4HD=i
virtual BOOL PreTranslateMessage(MSG* pMsg); *3T|M@Y
protected: +~xnXb1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )lJao
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3!5Ur&
//}}AFX_VIRTUAL ^z,_+},a3T
// Implementation bT
2a40ul
protected: "5eNLqt^q
HICON m_hIcon; >J|]moSVA
// Generated message map functions v)2M1
//{{AFX_MSG(CCaptureDlg) b)9'bJRvU
virtual BOOL OnInitDialog(); Me6+~"am/
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }du XC[ 6
afx_msg void OnPaint(); CRbdAqofV
afx_msg HCURSOR OnQueryDragIcon(); l2;CQ7
virtual void OnCancel(); ~4?9a(>3
afx_msg void OnAbout(); Xn~I=Ml d
afx_msg void OnBrowse(); G;f/Tch
afx_msg void OnChange(); F@R1:M9*
//}}AFX_MSG "*,XL
uv>
DECLARE_MESSAGE_MAP() L28*1]\Jh
}; )P7)0c
#endif W+*5"h
s}pIk.4ot!
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "bDs2E+W
#include "stdafx.h" P;pl,~
#include "Capture.h" e[Abp~@M1
#include "CaptureDlg.h" &i!vd/*WlD
#include <windowsx.h> eHDef
#pragma comment(lib,"hook.lib") p">EHWc}D
#ifdef _DEBUG e)E$}4
#define new DEBUG_NEW R0oKbs{
#undef THIS_FILE #$3yz'"QF
static char THIS_FILE[] = __FILE__; ~^+0
#endif nk3y"ne7
#define IDM_SHELL WM_USER+1 Dde]I_f}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *'"^NSJ
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h5yzwj:C?
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ." $
class CAboutDlg : public CDialog *6(kbe s
{ MQKfJru7
public: @(C1_
CAboutDlg(); $`Ix:gi
// Dialog Data sl*5Y#,|1
//{{AFX_DATA(CAboutDlg) vf4{$Oag
enum { IDD = IDD_ABOUTBOX }; :6q]F<oK
//}}AFX_DATA V34hFa
// ClassWizard generated virtual function overrides j1 =`|
//{{AFX_VIRTUAL(CAboutDlg) !z{-?o/
protected: U.{l;EL:T
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (LHp%LaZ\;
//}}AFX_VIRTUAL jjM{]
// Implementation 2Hum!p:1
protected: Pl-5ncb\
//{{AFX_MSG(CAboutDlg) [=%TnT+^9
//}}AFX_MSG moVbw`T
DECLARE_MESSAGE_MAP() {,OS-g
}; t tXjn
9Ct`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u{z``]
{ Ej7 /X ~
//{{AFX_DATA_INIT(CAboutDlg) Vb
qto|X@
//}}AFX_DATA_INIT *-s,.
F+c
}
rxO2QQ%V
1
y}2+Kk
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a?YCn!
{ h d~$WV0#
CDialog::DoDataExchange(pDX); q.2(OP>(
//{{AFX_DATA_MAP(CAboutDlg) =uDgzdDyE
//}}AFX_DATA_MAP )bx_;9Y{
} %<8nF5
[7m1Q<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?X?&~3iD%
//{{AFX_MSG_MAP(CAboutDlg) ?OdJqw0,G
// No message handlers t:LcNlN|
//}}AFX_MSG_MAP wB>r(xQ'
END_MESSAGE_MAP() ;IK[Y{W/
;@h0qRXW:h
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) '&;yT[
: CDialog(CCaptureDlg::IDD, pParent) #E0t?:t5bk
{ fA48(0p
//{{AFX_DATA_INIT(CCaptureDlg) n]+W 3[i
m_bControl = FALSE;
kj5Q\vr)
m_bAlt = FALSE; !QmzrX}h
m_bShift = FALSE; ;d$qc<2uA
m_Path = _T("c:\\"); Da$r `
m_Number = _T("0 picture captured."); FZiW|G
nCount=0; EliTFxp
bRegistered=FALSE; x( mE<UQN
bTray=FALSE; NvjJb-u
//}}AFX_DATA_INIT ?t@v&s
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B~'MBBD"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0:KE@=
} e$c?}3E!z
Fyyg`J
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ECa$vvK
m
{ 9s
+z B
CDialog::DoDataExchange(pDX); +D#Z n!P
//{{AFX_DATA_MAP(CCaptureDlg) 8&"(WuZ@
DDX_Control(pDX, IDC_KEY, m_Key); ;jK#[*y
DDX_Check(pDX, IDC_CONTROL, m_bControl); m"c :"I6
DDX_Check(pDX, IDC_ALT, m_bAlt); b{DiM098
DDX_Check(pDX, IDC_SHIFT, m_bShift); <b+[<@wS
DDX_Text(pDX, IDC_PATH, m_Path); !A8^Xmz"
DDX_Text(pDX, IDC_NUMBER, m_Number); BcA31%
//}}AFX_DATA_MAP Rd+P,PO
} [=*E+Oc
Bqws!RM'&@
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) rg(lCL&:S
//{{AFX_MSG_MAP(CCaptureDlg) Uh.Zi3X6}6
ON_WM_SYSCOMMAND() !k$}Kj)I
ON_WM_PAINT() vtJV"h?e"3
ON_WM_QUERYDRAGICON() ~`Qko-a&
ON_BN_CLICKED(ID_ABOUT, OnAbout) M^rM-{?<
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v}J;ZIb
ON_BN_CLICKED(ID_CHANGE, OnChange) i54md$Q^
//}}AFX_MSG_MAP ^C&+
~+
END_MESSAGE_MAP() z41_oG7
4"\yf
BOOL CCaptureDlg::OnInitDialog() =j0x.fSe
{ ANH4IYd3
CDialog::OnInitDialog(); P];JKE%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u%O-;>J
ASSERT(IDM_ABOUTBOX < 0xF000); ]Pn!nSg
CMenu* pSysMenu = GetSystemMenu(FALSE); u}9fj
if (pSysMenu != NULL) bAxTLIf
{ Jeqxspn
T
CString strAboutMenu; FqA3{
strAboutMenu.LoadString(IDS_ABOUTBOX); PM$Ee #62R
if (!strAboutMenu.IsEmpty()) tqOi
x/
{ e1
*__'
pSysMenu->AppendMenu(MF_SEPARATOR); xSpC'"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k7_I$<YDj
} sc`"P-J+vp
} A,~Hlw
SetIcon(m_hIcon, TRUE); // Set big icon )Du-_Z
SetIcon(m_hIcon, FALSE); // Set small icon IN^9uL]B
m_Key.SetCurSel(0); 4lc)&
RegisterHotkey(); KGZ?b2N?Va
CMenu* pMenu=GetSystemMenu(FALSE); _J?SIm
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zW{ 6Eg
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #`GbHxd
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }wt%1v-10U
return TRUE; // return TRUE unless you set the focus to a control a j|5 #
} Q 882B1H
r
-f
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0rMqWP
{ .")b?#K
if ((nID & 0xFFF0) == IDM_ABOUTBOX) @%i>XAe#0
{ (0*v*kYdL+
CAboutDlg dlgAbout; nYv#4*
dlgAbout.DoModal(); ^6 /j_G
} x;$|#]+
else <Mgf]v.QS
{ ~] =?b)B
CDialog::OnSysCommand(nID, lParam); ((3t:
} t\5c@j p
} ~
}KzJiL
{ctwo X[;
void CCaptureDlg::OnPaint() .+#Lx;})
{ 1czG55 |
if (IsIconic()) d5xxb _oE
{ y[HQBv
CPaintDC dc(this); // device context for painting *)VAaGUX>
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7{BnXN[
// Center icon in client rectangle >M^&F6
int cxIcon = GetSystemMetrics(SM_CXICON); vrcE]5(:s
int cyIcon = GetSystemMetrics(SM_CYICON); fDuwgY0
CRect rect; q
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GetClientRect(&rect); \v`#|lT$
int x = (rect.Width() - cxIcon + 1) / 2; ^/KfH&E
int y = (rect.Height() - cyIcon + 1) / 2;
';l fS
// Draw the icon |n P_<9[
dc.DrawIcon(x, y, m_hIcon); ./maY1>T
} 9EgP9up{6!
else {Qtq7q.
{ (:?&G9k
"
CDialog::OnPaint(); SfI*bJo>V
} 9G:TW|)L[Q
} 'XfgBJF=
Md9l+[@
HCURSOR CCaptureDlg::OnQueryDragIcon() CV^0.
{ ]xq::a{Oy
return (HCURSOR) m_hIcon; (DJvi6\H
} cb+y9wA
QaMDGD
void CCaptureDlg::OnCancel() z}5<$K_U
{ )bW5yG!
if(bTray) fcAIg(vW
DeleteIcon(); g37q/nEv
CDialog::OnCancel(); G*\sdBW!k
} _'JRo%{xGX
^pcRW44K
void CCaptureDlg::OnAbout() ?iln<%G
{ @%B4;c
CAboutDlg dlg; RWE~&w G}
dlg.DoModal(); X(GV6mJ4
} q:yO92Ow
4;\Y?M}g?
void CCaptureDlg::OnBrowse() `C<F+/q
{ rA#s
CString str; G.ud1,S#
BROWSEINFO bi; ^gm>!-Gx
char name[MAX_PATH]; A[9NP-~
ZeroMemory(&bi,sizeof(BROWSEINFO)); a;&}zcc*
bi.hwndOwner=GetSafeHwnd(); fOW_h
bi.pszDisplayName=name; ??I:H
bi.lpszTitle="Select folder"; jaqV[*440U
bi.ulFlags=BIF_RETURNONLYFSDIRS; 4Iq5+Q
LPITEMIDLIST idl=SHBrowseForFolder(&bi); VG\mo?G
if(idl==NULL) ('BLU.7IX
return; 9r8D*PvS
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t&f" jPu>
str.ReleaseBuffer(); 6K//1U$
m_Path=str; Q [:<S/w
if(str.GetAt(str.GetLength()-1)!='\\') R9=K(pOT
m_Path+="\\"; e`ex]py<C
UpdateData(FALSE); !w=,p.?V=
} P!>g7X
#11RLvDQd
void CCaptureDlg::SaveBmp() $NCm;0\B|
{ P CsK()
CDC dc; JjDS"hK#
dc.CreateDC("DISPLAY",NULL,NULL,NULL); L<E/,IdE
CBitmap bm; poY8
)2
int Width=GetSystemMetrics(SM_CXSCREEN); qL>v&Rd<
int Height=GetSystemMetrics(SM_CYSCREEN); 'fl(N2t
bm.CreateCompatibleBitmap(&dc,Width,Height); RO$*G
jQd
CDC tdc; ]+lF=kkc%
tdc.CreateCompatibleDC(&dc); \4@a
CBitmap*pOld=tdc.SelectObject(&bm); ^?sSx!:bZ
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); V g6S/-
tdc.SelectObject(pOld); !=knppY
BITMAP btm; @SQceQfB
bm.GetBitmap(&btm); R_9 o!sTZ
DWORD size=btm.bmWidthBytes*btm.bmHeight; =SL^>HS.fo
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); LT&/0
BITMAPINFOHEADER bih; JilKZQmk
bih.biBitCount=btm.bmBitsPixel; R25-/6_V>
bih.biClrImportant=0; GDmv0V$6
bih.biClrUsed=0; ]gHLcr3
bih.biCompression=0; w<mqe0
bih.biHeight=btm.bmHeight; VwC4QK,d;
bih.biPlanes=1; fU`T\
bih.biSize=sizeof(BITMAPINFOHEADER); /'"R Mq
bih.biSizeImage=size; n531rkK-
bih.biWidth=btm.bmWidth; qu!<lW~c
bih.biXPelsPerMeter=0; *cQz[S@F
bih.biYPelsPerMeter=0; 7H?!RYrx
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _0*=u$~R
static int filecount=0; ,L~snR'w
CString name; >E~~7Yal
name.Format("pict%04d.bmp",filecount++); g6`.qyVfz'
name=m_Path+name; y0y+%H-
BITMAPFILEHEADER bfh; qAbd xd[
bfh.bfReserved1=bfh.bfReserved2=0; -rRz@Cr
bfh.bfType=((WORD)('M'<< 8)|'B'); +ruj
bfh.bfSize=54+size; 4zwif&
bfh.bfOffBits=54; 5Ny0b|+p
CFile bf; 6<+8}`@B>G
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ) _#T c
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); r=|vad$
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I'P.K| "R
bf.WriteHuge(lpData,size); P1e5uJkd
bf.Close(); ~"\P~cg0J
nCount++; .;j"+Ef
} y
"<JE<X
GlobalFreePtr(lpData); }Uq/kei^P
if(nCount==1) ![j(o!6&
m_Number.Format("%d picture captured.",nCount); |:}L<9Sq
else 0x6@{0
m_Number.Format("%d pictures captured.",nCount); 8db6(Q~P
UpdateData(FALSE); *eMLbU7
} /T{mS7EpYc
sbpu
qOL
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,qYf#fU#7
{ ={OCa1
if(pMsg -> message == WM_KEYDOWN) z^"?sd
{ $/os{tzjd
if(pMsg -> wParam == VK_ESCAPE) &9k"9
return TRUE; i /C'0
if(pMsg -> wParam == VK_RETURN) })q]gMj
return TRUE; OY$7`8M[
} 9.jG\i
return CDialog::PreTranslateMessage(pMsg); \:C%>
.VG
} rC~_:uXtE
,Qga|n8C
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^75pV%<%
{ .!9Vt#
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ C?bXrG\
SaveBmp(); m2wp m_vV#
return FALSE; 5NFq7&rJ6
} e-1;dX HL
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g+VRT,r
CMenu pop; t%
<pbZO
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5BZ+b_A>VV
CMenu*pMenu=pop.GetSubMenu(0); EwC5[bRjUp
pMenu->SetDefaultItem(ID_EXITICON); }`?7\\6
CPoint pt; IwOfZuS
GetCursorPos(&pt); tP -5
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9{T 8M
if(id==ID_EXITICON) E`U&Z
DeleteIcon(); tvv[$b&
else if(id==ID_EXIT) ]Pz|Oi+]
OnCancel(); 5Gc_LI&v7
return FALSE; oXvdR(Sb^
} 8a_ UxB
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c,+iU R<
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) x4/T?4k
AddIcon(); Bi %Z2/
return res; ?]759,Q3L
} Jx)~kK
$gXkx D
void CCaptureDlg::AddIcon() `4se7{'UK`
{ 8Ix-i
NOTIFYICONDATA data; tuX =o
data.cbSize=sizeof(NOTIFYICONDATA); `"i^'VL,
CString tip; EolE?g@l8
tip.LoadString(IDS_ICONTIP); B!$V\Gs
data.hIcon=GetIcon(0); x;<oaT$X
data.hWnd=GetSafeHwnd();
<|ka{=T
strcpy(data.szTip,tip); I3V{"Nx6
data.uCallbackMessage=IDM_SHELL; c8H9_6
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2(@LRl>:
data.uID=98; [P (rY
Shell_NotifyIcon(NIM_ADD,&data); 9(i0"hS^
ShowWindow(SW_HIDE); &Xj {:s#
bTray=TRUE; 5)h+(u C3
}
zjZ;xn
W*1d
X"S
void CCaptureDlg::DeleteIcon() #i'C
{ T2;v<(
NOTIFYICONDATA data; : Bdi pc
data.cbSize=sizeof(NOTIFYICONDATA); @&/s~3
data.hWnd=GetSafeHwnd(); 3U :YA&K(
data.uID=98; 7Y$4MMNQ
Shell_NotifyIcon(NIM_DELETE,&data); u<BHf@AI
ShowWindow(SW_SHOW); ay!6T`U`
SetForegroundWindow(); <L[T'ZE+
ShowWindow(SW_SHOWNORMAL); yBUZVqqDa
bTray=FALSE; r@N39O*Wq
} LG"BfYy6
WRN8#b
void CCaptureDlg::OnChange() WsG"x>1n
{ 7-g]A2N
RegisterHotkey(); $%N;d>[U,
} 3sd{AkD^
P2A]qX
BOOL CCaptureDlg::RegisterHotkey() 5WrIg(l
{ O6*'gnke
UpdateData(); My'9S2Y8nv
UCHAR mask=0; ^K1~eb*K
UCHAR key=0; :HQ8M*o
if(m_bControl) +H2m<
mask|=4; jV(xYA3
if(m_bAlt) 1R^XWAb
mask|=2; nsM>% +o
if(m_bShift) ze#rYN vo/
mask|=1; NgmO0H
key=Key_Table[m_Key.GetCurSel()]; IG2 `9rR
if(bRegistered){ ?0 KiR?
DeleteHotkey(GetSafeHwnd(),cKey,cMask); E7d~#
bRegistered=FALSE; A)O_es2
} M6o
xtt4
cMask=mask; 4eDmLC"Y
*
cKey=key; =!I8vQ>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); u&?yPR
return bRegistered; b<29wL1
} F``EARG)iu
% 8rr*l5
四、小结 MbT
ONt?~v
[="g|/M)
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。