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:
nmlPX7!{$
E}CiQUx 一、实现方法
|VOg\[f zWw2V}U! 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:
ezhDcI_T wI M{pK #pragma data_seg("shareddata")
6nDV1O5 HHOOK hHook =NULL; //钩子句柄
,O1O8TwUB0 UINT nHookCount =0; //挂接的程序数目
!DjvsG1x static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
@Un/c:n static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
M"q[ p static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
HLQ"?OFlz static int KeyCount =0;
C7T(+Wd!, static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
C2]Kc{4 #pragma data_seg()
M|T4~Q U& TAL/a*7\ 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。
]!1OH
|Ad "Z,q?F c 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:
hf!|\f ZZ/cq:3$ P BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
>-T`0wI cKey,UCHAR cMask)
N\t1T(C| {
>Sk[vI0Y BOOL bAdded=FALSE;
k1z$e*u&r for(int index=0;index<MAX_KEY;index++){
s*M@%_A? if(hCallWnd[index]==0){
Q^}%c
U0 hCallWnd[index]=hWnd;
z
`8cOK- HotKey[index]=cKey;
\a"Ct' HotKeyMask[index]=cMask;
G"
b60RQ bAdded=TRUE;
BOlAm*tFt KeyCount++;
lw8"'0 break;
x9>\(-uU }
<dA8
'7^ }
NCeaL-y7 return bAdded;
5G}6;U Y }
bTmL5}n //删除热键
[y)FcIK} BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
i;\s.wrzH {
g]mtFrP BOOL bRemoved=FALSE;
}`/gX=91 for(int index=0;index<MAX_KEY;index++){
$KV&\Q3\0 if(hCallWnd[index]==hWnd){
L/}iy} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$*MCUnl hCallWnd[index]=NULL;
@`u?bnx]e HotKey[index]=0;
}m]q}r HotKeyMask[index]=0;
jX=lAs~6 bRemoved=TRUE;
/z."l!u6 KeyCount--;
\L!uHAE2a break;
=?}twC$ }
iCG`3(xL }
suJ_nb }
'aJgLws*w return bRemoved;
4k}e28 }
cleOsj;S Y8s;w!/ 'E;W DLL中的钩子函数如下:
l?N`{,1^ my^ak*N LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qV1O-^&[f= {
Os),;W0w4 BOOL bProcessed=FALSE;
@_'OyRd8 if(HC_ACTION==nCode)
A;K(J4y* {
vL_zvXA if((lParam&0xc0000000)==0xc0000000){// 有键松开
8m=Z|"H@ switch(wParam)
F%.xuL W {
HB&
& case VK_MENU:
0`hwmDiB" MaskBits&=~ALTBIT;
,4F,:w break;
64ox jF) case VK_CONTROL:
M8W# io MaskBits&=~CTRLBIT;
wvc>0?t' break;
-/{af case VK_SHIFT:
*$,+`+ MaskBits&=~SHIFTBIT;
?qHF}k| break;
V2znU default: //judge the key and send message
4Kp L>'Q= break;
Eek9|i"p }
)@7DsV/M for(int index=0;index<MAX_KEY;index++){
n[k1np$7?6 if(hCallWnd[index]==NULL)
=G>(~+EA continue;
-f>'RI95> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(i`(>I.(/ {
is#8R:7.: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
sOC&Q&eg bProcessed=TRUE;
,"
R>}kPli }
O]=C#E{ }
WYIw5jzC }
mN1Ssq"B else if((lParam&0xc000ffff)==1){ //有键按下
+$pJ5+v switch(wParam)
av' *u {
Q_P5MLU> case VK_MENU:
:EHQ .^ MaskBits|=ALTBIT;
_vrWj<wyf break;
9{eBgdC case VK_CONTROL:
uEd,rEB> MaskBits|=CTRLBIT;
'V!kL,
9ES break;
bEpMaBN case VK_SHIFT:
n6f3H\/P& MaskBits|=SHIFTBIT;
X%4h(7;v break;
'h*Zc}Q: default: //judge the key and send message
#)74X%4( break;
981!2* }
])$S\fFm for(int index=0;index<MAX_KEY;index++){
Y6eEGo"K.+ if(hCallWnd[index]==NULL)
{'~sS continue;
b=LF%P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g_ M-F {
'Z[d7P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
0|C[-ppr bProcessed=TRUE;
/yYlu }
gMZ&,n4 }
?)cJZ>$!w }
i$O#%12l if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
*Mi6 for(int index=0;index<MAX_KEY;index++){
{wu!6\:<?? if(hCallWnd[index]==NULL)
"6V_/u5M;= continue;
,OB&nN t> if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^Kw(&v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%FS;>;i? //lParam的意义可看MSDN中WM_KEYDOWN部分
M[,^KJ! }
iEhDaC[e(b }
cEi<}9r }
s1=u{ET return CallNextHookEx( hHook, nCode, wParam, lParam );
Mf7E72{D }
Gg+YfY_ liG~y| 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
rk|a'& h544dNo& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
zjWyGt(Q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
S ljZ~x,! J~2CD*v 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
m/N(%oMWB= s=j O;K$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
}2xb&6g~o {
)`RZkCe if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
gT7I9 (x!W {
-9Xw]I#QR //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
L4mTs-M. SaveBmp();
g{&PrE'e9 return FALSE;
qid1b
b }
KqY>4tb …… //其它处理及默认处理
}'_ :XKLj }
ZArf;&8 /
GZV_H%v ]=pWZ~A 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。
-CZ-l;5 7x:F!0:
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。
v_.j/2U C$0ITw 二、编程步骤
y7
<(,uT LQ|<3] 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";
,DQ
>&_DK '.xkn{c 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
$q=hcu 4t(QvIydA 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;
xKisL=l6Y GYTbeY 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;
kfIbgya m
R"9&wq 5、 添加代码,编译运行程序。
5vl2yN yl|R:/2V 三、程序代码
K
oL%}u& A'w2GC{. ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
m./*LXU #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<`b|L9 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
U@MOvW) #if _MSC_VER > 1000
E ,Dlaq #pragma once
<kk'v'GW@ #endif // _MSC_VER > 1000
>4Fdxa #ifndef __AFXWIN_H__
1gO//fdI #error include 'stdafx.h' before including this file for PCH
W'8J<VBD #endif
$::51#^Wg #include "resource.h" // main symbols
"otr+.{`* class CHookApp : public CWinApp
[ )B@ {
vHoT@E#}' public:
N>h]mX6 CHookApp();
P[r}(@0rJ // Overrides
thR|h+B // ClassWizard generated virtual function overrides
ei(|5h //{{AFX_VIRTUAL(CHookApp)
vQE` c@^{ public:
/<Gyg7o0 virtual BOOL InitInstance();
k{!iDZr&f, virtual int ExitInstance();
7UY('Q[ //}}AFX_VIRTUAL
NO%|c|B| //{{AFX_MSG(CHookApp)
}"!6Xm // NOTE - the ClassWizard will add and remove member functions here.
q
oKQEG2 // DO NOT EDIT what you see in these blocks of generated code !
](idf(j //}}AFX_MSG
pU[a[ DECLARE_MESSAGE_MAP()
z0FR33- };
\r)_- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
mJU>f-l BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
EVby 9! BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
ZC>`ca BOOL InitHotkey();
.CB"@.7 BOOL UnInit();
:C}KI) #endif
R|d^M&K, Ta!m%=8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
j58Dki->. #include "stdafx.h"
Ej9/_0lt #include "hook.h"
F='jmiVJ #include <windowsx.h>
D"1vw<Ak #ifdef _DEBUG
96^1Ivd #define new DEBUG_NEW
X}ey0)g% #undef THIS_FILE
.je~qo) static char THIS_FILE[] = __FILE__;
4IH0un #endif
Z &ua,:5 #define MAX_KEY 100
x(T!I&i={ #define CTRLBIT 0x04
BHiw!S< #define ALTBIT 0x02
NG4eEnic!a #define SHIFTBIT 0x01
mUe@Dud #pragma data_seg("shareddata")
2xz%'X% HHOOK hHook =NULL;
xP|%rl4 UINT nHookCount =0;
`t/@ L: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
w7.?zb !N static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Gff[c%I static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
.T
N`p* static int KeyCount =0;
`i_L?C7 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
'/n%}=a= #pragma data_seg()
;NN(CKZ9A HINSTANCE hins;
jQw`*Y/, void VerifyWindow();
%^)Ja EUC BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
8{U]ATx'( //{{AFX_MSG_MAP(CHookApp)
0YTtA]|`4 // NOTE - the ClassWizard will add and remove mapping macros here.
a v|6r# // DO NOT EDIT what you see in these blocks of generated code!
b*F :l# //}}AFX_MSG_MAP
dcc%G7w END_MESSAGE_MAP()
C$Hl`>?$ OL6xMToP CHookApp::CHookApp()
wb}N-8x {
IJb1)
ZuR // TODO: add construction code here,
+X|m>9 // Place all significant initialization in InitInstance
UHsrZgIRYT }
Q,`2DHhK el*pYI CHookApp theApp;
}G:uzud10 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
e*'|iuDrY {
")[Q4H;V BOOL bProcessed=FALSE;
z)?#UdBQv if(HC_ACTION==nCode)
<PuB3PEvV {
O+UV\ if((lParam&0xc0000000)==0xc0000000){// Key up
6XxG1]84 switch(wParam)
,oi`BOh {
3I{ta/( case VK_MENU:
po](6V MaskBits&=~ALTBIT;
R4rm>zisVX break;
%JA&O case VK_CONTROL:
Hr8$1I$= MaskBits&=~CTRLBIT;
~m;MM)_V break;
j*Wh;I+h case VK_SHIFT:
BC0c c[x MaskBits&=~SHIFTBIT;
h9OL%n 7m' break;
ek.WuOs default: //judge the key and send message
Z!=Pc$? break;
gp&&
c, }
("M#R!3 for(int index=0;index<MAX_KEY;index++){
n4_:#L? if(hCallWnd[index]==NULL)
<[B[ continue;
_=^hnv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r(2'0JQ {
7[.Q.3FL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]ieA?:0Hi bProcessed=TRUE;
x_iy;\s1 }
?`*-QG} }
g!)LhE }
en#g<on else if((lParam&0xc000ffff)==1){ //Key down
eYSGxcx switch(wParam)
$^D(% {
HtXBaIl\ case VK_MENU:
*Wo$$T MaskBits|=ALTBIT;
!m:PBl5
break;
"M#`y!__ case VK_CONTROL:
RDZh>K
PG MaskBits|=CTRLBIT;
bz@=zLBt break;
j[ZniD case VK_SHIFT:
=O:ek#Bp MaskBits|=SHIFTBIT;
> FcA, break;
8cPf0p: default: //judge the key and send message
2?7hUaHX break;
Gv
nclnG }
f<Um2YGW for(int index=0;index<MAX_KEY;index++)
<UHWy&+z& {
\ui~n:aWJ if(hCallWnd[index]==NULL)
714nUA872 continue;
<l
s/3! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hA1hE?c` {
/ZN5WK SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w58 QX/XG bProcessed=TRUE;
#YYvc`9 }
H_f2:Za }
eV=sDx }
1Kf
t?g if(!bProcessed){
Y},GZ ^zqy for(int index=0;index<MAX_KEY;index++){
+/lj~5:y if(hCallWnd[index]==NULL)
8jGoU9 continue;
)w?$~q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|oi49:NXn SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
x]+KO)I }
[>9"RzEl }
]Tw6Fg1o> }
b/}0
&VXo return CallNextHookEx( hHook, nCode, wParam, lParam );
ea}KxLC`, }
@!NHeH=pR V+ ~2q= BOOL InitHotkey()
$,#IPoi~X {
yf^gU* if(hHook!=NULL){
H0NyxG< nHookCount++;
M@[gT?mv1 return TRUE;
ddhTri'f }
N ^`Efpvg else
?o'arxCxZn hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
>ZsK5v if(hHook!=NULL)
/[dAgxL nHookCount++;
Z'm%3 return (hHook!=NULL);
8_$2aqr }
buyz>ICP BOOL UnInit()
^S2}0Nf {
e1 }0f8% if(nHookCount>1){
*0ntx$M-w nHookCount--;
~mo` return TRUE;
LB+=?Mz V }
@CUDD{1o BOOL unhooked = UnhookWindowsHookEx(hHook);
EPnB%'l\c if(unhooked==TRUE){
d/QM nHookCount=0;
640V&<+v hHook=NULL;
L<]PK4 }
^P`'qfZ return unhooked;
]>T/Gl1 }
XKIJ6M~5k Vo8"/]_h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
q2i~<;Z)9 {
v]S8!wU BOOL bAdded=FALSE;
zz*[JIe for(int index=0;index<MAX_KEY;index++){
Vp4] if(hCallWnd[index]==0){
lI<8)42yq hCallWnd[index]=hWnd;
<2A' HotKey[index]=cKey;
a8c]B/ HotKeyMask[index]=cMask;
d_B5@9e# bAdded=TRUE;
jK1!
\j KeyCount++;
7J/3O[2 break;
1D]wW%us }
n8,/olqwW }
&p/k VM return bAdded;
IW*.B6Hw8 }
U%l{>*q v0H#\p BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
b7mP~]V {
_?<Fc8F BOOL bRemoved=FALSE;
Vd~k4 for(int index=0;index<MAX_KEY;index++){
,/9|j*9H if(hCallWnd[index]==hWnd){
7X>3WF if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_;W|iUreb hCallWnd[index]=NULL;
TUr}p aw_ HotKey[index]=0;
+[+Jd)Z HotKeyMask[index]=0;
VTa8.(i6v bRemoved=TRUE;
$<PVzW,$o KeyCount--;
)cXc"aj@s break;
XwMC/]lK< }
Kfl+8UR5= }
ktRdf6:~ }
Mk;j"ZDF return bRemoved;
.EQFHStr }
plAt
+*& d-aF- void VerifyWindow()
)
|a5Qxz {
_i#Z'4?2E for(int i=0;i<MAX_KEY;i++){
V>Cf
8>m if(hCallWnd
!=NULL){ 2rM i~8T
if(!IsWindow(hCallWnd)){ &D#v0!e~x
hCallWnd=NULL; %e(,PL
HotKey=0; Xqk$[peS
HotKeyMask=0; xB#E&}Ho
KeyCount--; ^y,ip=<5\3
} sYzG_*)
} /^"TMm
} ;z#9>99rH
} \N)FUYoHg
^9i^Ci9
BOOL CHookApp::InitInstance() A
3l1$t#w
{ E7D
DMU
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (@Bm2gH
hins=AfxGetInstanceHandle(); [B[ J%?NS
InitHotkey(); {T9g\F*
return CWinApp::InitInstance(); #*~Uu.T
} $O#h4L_
{)M4h?.2
int CHookApp::ExitInstance() Velmq'n
{ '"EOLr\Z,
VerifyWindow(); /zWWUl`:
UnInit(); KME
#5=~
return CWinApp::ExitInstance(); VO9<:R
} :Z)s'd.
\ gN) GR
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m:t$&
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?cJ$=
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ yRtFUlm`
#if _MSC_VER > 1000 bu.36\78
#pragma once R[(,wY_1
#endif // _MSC_VER > 1000 >h9U~#G=
ATU@5,9
class CCaptureDlg : public CDialog O]>Or3oO
{ Dj|S
// Construction :X#(T-!t
public: nF-FoO98
BOOL bTray; $#!~K2$
BOOL bRegistered; >@X=E3
BOOL RegisterHotkey(); VYwaU^
UCHAR cKey; \=@}(<4
UCHAR cMask; o.Q9kk?L
void DeleteIcon(); X}ZOjX!
void AddIcon(); buoz La
UINT nCount; Q*wx6Pu8
void SaveBmp(); HOw hl
CCaptureDlg(CWnd* pParent = NULL); // standard constructor JsC0^A;fM
// Dialog Data 8WH>
//{{AFX_DATA(CCaptureDlg) kahv1s-
enum { IDD = IDD_CAPTURE_DIALOG }; zb<+x(0y"
CComboBox m_Key; bY<" $);s
BOOL m_bControl; B}Qo8i7
z
BOOL m_bAlt; z7CYYU?
BOOL m_bShift; o^ 4+eE
CString m_Path; H\S,^)drJ?
CString m_Number; Mf
*qr9*
//}}AFX_DATA yF:fxdpw
// ClassWizard generated virtual function overrides X>CYKRtb
//{{AFX_VIRTUAL(CCaptureDlg) Ut%ie=c
public: IJ0RHDod:
virtual BOOL PreTranslateMessage(MSG* pMsg); VS`S@+p
protected: Mk?9`?g.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4e:hKv,+4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pp:+SoyN
//}}AFX_VIRTUAL q<1@ut
// Implementation ZGrV? @o,6
protected: t!~mbx+
HICON m_hIcon; <I>q1m?KN
// Generated message map functions }X$>84s>[P
//{{AFX_MSG(CCaptureDlg) -{<%Wt9
virtual BOOL OnInitDialog(); [:o#d`^
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bUBuJ
afx_msg void OnPaint(); C/E3NL8
afx_msg HCURSOR OnQueryDragIcon(); HqbTJ!a
virtual void OnCancel(); ?]})Xf.A
afx_msg void OnAbout(); +vQyHo
afx_msg void OnBrowse(); K@fxCj*}
afx_msg void OnChange(); |k)u..k{>
//}}AFX_MSG &8 (2U-
DECLARE_MESSAGE_MAP() g5cR.]oz
}; |9g*rO
#endif cx02b-O
R38
w!6{
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mdk:2ndP
#include "stdafx.h" iD\joh-C
#include "Capture.h" GY!&H"%
#include "CaptureDlg.h" uIR_p\)
#include <windowsx.h> cB<Zez
#pragma comment(lib,"hook.lib") )j$Bo{
#ifdef _DEBUG w#o<qrpHf
#define new DEBUG_NEW =#W{&Te;
#undef THIS_FILE ^!}lA9\gY
static char THIS_FILE[] = __FILE__; A(C3kISM
#endif ZF`ckWT:-N
#define IDM_SHELL WM_USER+1 o(a*Fk$
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KL xg
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lmod8B
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fN&O `T>
class CAboutDlg : public CDialog }3+(A`9h f
{ gcz1*3)
public: !is8`8F8
CAboutDlg(); w0.#/6
// Dialog Data F'"-4YV>&
//{{AFX_DATA(CAboutDlg) ]\GGC]:\@
enum { IDD = IDD_ABOUTBOX }; R%ddB D\?
//}}AFX_DATA i#C?&
// ClassWizard generated virtual function overrides 1mB6rp
//{{AFX_VIRTUAL(CAboutDlg) B
(BWdrG
protected: co;2s-X
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k<St:X%.O
//}}AFX_VIRTUAL Sw0~6RZ
// Implementation >- :U
protected: dCc*<S
//{{AFX_MSG(CAboutDlg) D3jP hPy.
//}}AFX_MSG wp@c;gK7
DECLARE_MESSAGE_MAP() 10a=[\ Q
}; %7{6>6%
DO0["O74
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (;s\Ip0
{ pE=wP/#
//{{AFX_DATA_INIT(CAboutDlg) }e82e
//}}AFX_DATA_INIT q k !Q2W
} y(q1~73s
a
ZfX |
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `]fY9ZDKs
{ jdhhvoQ
CDialog::DoDataExchange(pDX); Yc9 M6=E^
//{{AFX_DATA_MAP(CAboutDlg) Z3I<
//}}AFX_DATA_MAP t4,6`d?C
} H
>RGX#|
`OBDx ^6F
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u|Db%)[
//{{AFX_MSG_MAP(CAboutDlg) =!p6}5Z
// No message handlers xOS4J+' s@
//}}AFX_MSG_MAP z/;NoQ-
END_MESSAGE_MAP() af> i
zRu}lJ1#W$
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jtd{=[STU
: CDialog(CCaptureDlg::IDD, pParent) hmks\eb~
{ (}}BZS&.
//{{AFX_DATA_INIT(CCaptureDlg) _7 n+j
m_bControl = FALSE;
l_$~~z ~
m_bAlt = FALSE; MF=@PE][
m_bShift = FALSE; 96 C|R
m_Path = _T("c:\\"); ;zs4>>^>
m_Number = _T("0 picture captured."); c1Dhx,]ad
nCount=0; Yj;$hV8j(
bRegistered=FALSE; "4I`.$F%O(
bTray=FALSE; QHA<7Wg
//}}AFX_DATA_INIT _sw,Y!x%dF
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /\C9FGS
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #K
]k
} k~:B3p
F%L^k.y$
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W4T>@b.
{ t R*JM$T
CDialog::DoDataExchange(pDX); 5.idC-\
//{{AFX_DATA_MAP(CCaptureDlg) F!N;4J5u
DDX_Control(pDX, IDC_KEY, m_Key); ?. CA9!|
DDX_Check(pDX, IDC_CONTROL, m_bControl); aQkgkV;~
DDX_Check(pDX, IDC_ALT, m_bAlt); qksN {t
DDX_Check(pDX, IDC_SHIFT, m_bShift); Pgb<;c:4
DDX_Text(pDX, IDC_PATH, m_Path); H<"{wUPT0
DDX_Text(pDX, IDC_NUMBER, m_Number); t[7YMk
//}}AFX_DATA_MAP spgY &OI;
} .~C*7_
~[l2"@
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {b} ?I4)
//{{AFX_MSG_MAP(CCaptureDlg) = R; 0Ed&b
ON_WM_SYSCOMMAND() \O`B@!da~
ON_WM_PAINT() X,^J3Ek>O
ON_WM_QUERYDRAGICON() G+=&\+{#4
ON_BN_CLICKED(ID_ABOUT, OnAbout) <(;"L<?D<C
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }h EBX:-
ON_BN_CLICKED(ID_CHANGE, OnChange) Q:lSKf
//}}AFX_MSG_MAP c.,eIiL
END_MESSAGE_MAP() 61b,+'-
pn>zuHe
BOOL CCaptureDlg::OnInitDialog() cKdy)T%;
{ lB.P
CDialog::OnInitDialog(); >\[sNCkf
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }yC ve
ASSERT(IDM_ABOUTBOX < 0xF000); DBbmM*r
CMenu* pSysMenu = GetSystemMenu(FALSE); KhYGiVA
if (pSysMenu != NULL) @D Qg1|m
{ R2Lq,(@-
CString strAboutMenu; K-(,,wS
strAboutMenu.LoadString(IDS_ABOUTBOX); *~4w%U4T0
if (!strAboutMenu.IsEmpty()) FK;\Nce&
{ wlmi&kq
pSysMenu->AppendMenu(MF_SEPARATOR); n-}.Yc
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); fw'$HV76
} )k- 7mwkZ
} Ilsh
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SetIcon(m_hIcon, TRUE); // Set big icon @| qnD
SetIcon(m_hIcon, FALSE); // Set small icon _)ZAf%f?
m_Key.SetCurSel(0); m>jX4D7KZ
RegisterHotkey(); }Sqey:9jH
CMenu* pMenu=GetSystemMenu(FALSE); [AfV+$
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -|:7<$2#I
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $BwWhR
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); wwmMpK}f
return TRUE; // return TRUE unless you set the focus to a control 2p8JqZMQb
} \/. Of]YQ
lD _
u
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) QaUh+k<6
{ >/ECLP
if ((nID & 0xFFF0) == IDM_ABOUTBOX) &H-39;?u
{ RHz'Dz>0
CAboutDlg dlgAbout; >rB7ms/@E
dlgAbout.DoModal(); gh['T,
} N"2P&Ho]
else qd%5[A
{ -P!vCf^{
t
CDialog::OnSysCommand(nID, lParam); %]nLCoQh
} uZW
? 0W
} 4qrPAt
AuX&
void CCaptureDlg::OnPaint() Gg{@]9
{ cs8bRXjHa
if (IsIconic()) 7=6p
{ axxdW)+K
CPaintDC dc(this); // device context for painting 7"Zr:|$U
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =uYSZR
// Center icon in client rectangle f]0kG
int cxIcon = GetSystemMetrics(SM_CXICON); F
C2oP,
int cyIcon = GetSystemMetrics(SM_CYICON); 4&R\6!*s
CRect rect; 7?]gUrE
GetClientRect(&rect); e-]k{_wm
int x = (rect.Width() - cxIcon + 1) / 2; mO?G[?*\
int y = (rect.Height() - cyIcon + 1) / 2;
u> %r(
// Draw the icon d_QHm;}Cx
dc.DrawIcon(x, y, m_hIcon); X.o[=E
} OV;Ho
else fp:j~a>E
{ /thCu%%9A
CDialog::OnPaint(); ST'L \yebc
} q@8Rlc&
} Z@RAdwjR`p
@ J!)o d
HCURSOR CCaptureDlg::OnQueryDragIcon() s3uT:Xw3rW
{ ]zhFFq`
return (HCURSOR) m_hIcon; 1Yz1/gFj
} \@*cj8e
R
=mawmQ2
void CCaptureDlg::OnCancel() $*MjNj2
{ nR!qolh
if(bTray) U:J~Oy_Z
DeleteIcon(); O8[dPmW
CDialog::OnCancel(); j0kEi+!TVq
} <;Qle
"@$o'rfT
void CCaptureDlg::OnAbout() VrQw;-rQ
{ V.1sb
pI
CAboutDlg dlg; :kOLiko!4>
dlg.DoModal(); c)rI[P7Q
} xPq3Sfg`A
WN?!(r<qA_
void CCaptureDlg::OnBrowse() AZI%KM[
{ '"GdO;}&
CString str; C3G?dZKv2
BROWSEINFO bi; rfXM*h
char name[MAX_PATH]; dU:s^^f&R
ZeroMemory(&bi,sizeof(BROWSEINFO)); RgRyo
bi.hwndOwner=GetSafeHwnd(); QEQ8gfN9>
bi.pszDisplayName=name; DS=kSkW^&5
bi.lpszTitle="Select folder"; `5O<U~'d
bi.ulFlags=BIF_RETURNONLYFSDIRS; z]gxkol\
LPITEMIDLIST idl=SHBrowseForFolder(&bi); OAOG&6xu8
if(idl==NULL) /U N%P2>^1
return; K)_0ej~C
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d,8V-Dk+p
str.ReleaseBuffer(); '+f!(teLz
m_Path=str; PcM:0(,G
if(str.GetAt(str.GetLength()-1)!='\\') No=f&GVg
m_Path+="\\"; 7M3q|7?
UpdateData(FALSE); qAivsYN*
} `vL R;D
?rk3oa-
void CCaptureDlg::SaveBmp() gS4K](KH |
{ Af5In9WB5
CDC dc; yc_(L-'n
dc.CreateDC("DISPLAY",NULL,NULL,NULL); *>$'aQ
CBitmap bm; qf4|!UR{
int Width=GetSystemMetrics(SM_CXSCREEN); u'yePJTE
int Height=GetSystemMetrics(SM_CYSCREEN); S8.nM}x
bm.CreateCompatibleBitmap(&dc,Width,Height); kYPowM
CDC tdc; e%wbUr]c2
tdc.CreateCompatibleDC(&dc); R?Iv<(I
CBitmap*pOld=tdc.SelectObject(&bm); Vn=J$Uv0
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]A<\d
tdc.SelectObject(pOld); N^%[
B9D
BITMAP btm; D;BFl(l
bm.GetBitmap(&btm); |n01T_Z)P
DWORD size=btm.bmWidthBytes*btm.bmHeight; *Ty>-aS1
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); SDA
+XnmH
BITMAPINFOHEADER bih; G5TdAW
bih.biBitCount=btm.bmBitsPixel; +:/`&LOS-
bih.biClrImportant=0; XfViLBY(
>
bih.biClrUsed=0; d!Y,i!l!
bih.biCompression=0; /5U?4l(6[f
bih.biHeight=btm.bmHeight; d<`Z{"g NS
bih.biPlanes=1; "N7C7`izc
bih.biSize=sizeof(BITMAPINFOHEADER); H{p+gj^J
bih.biSizeImage=size; s8.oS);`
bih.biWidth=btm.bmWidth; V9B $_j4
bih.biXPelsPerMeter=0; p1J%=
bih.biYPelsPerMeter=0; &NHIX(b6
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KXicy_@DC`
static int filecount=0; ?y]3kU
CString name; _$i9Tk
name.Format("pict%04d.bmp",filecount++); wz073-v>ZV
name=m_Path+name; 5OpK~f5
BITMAPFILEHEADER bfh; `=q)-y_C
bfh.bfReserved1=bfh.bfReserved2=0; pOnZ7(
bfh.bfType=((WORD)('M'<< 8)|'B'); ZLE4XB]
bfh.bfSize=54+size; XImb"7|
bfh.bfOffBits=54; Q?W]g%:)
CFile bf; xCoQ>.4p
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h %MPppCEa
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R%7k<1d'`
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); R4@C>\c%m
bf.WriteHuge(lpData,size); Ddt(*z
/
bf.Close(); K'1rS[^>R
nCount++; O?8G
} D?X97jNm
GlobalFreePtr(lpData); L.+5`&
if(nCount==1) Q'$aFl'NR
m_Number.Format("%d picture captured.",nCount); 5-=mtvA:
else ymr-kB
m_Number.Format("%d pictures captured.",nCount); m(*CuM[E
UpdateData(FALSE); ~[ve?51
} 1eiH%{w
;v8,r#4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )|Y"^K%Jm
{
k"GW3E;
if(pMsg -> message == WM_KEYDOWN) B1*%pjy
{ lFI"U^xC
if(pMsg -> wParam == VK_ESCAPE) ")x9A&p
return TRUE; ]%shs
if(pMsg -> wParam == VK_RETURN) T'fE4}rY
return TRUE; Jw;J$
u!d
} tao3Xr^?
return CDialog::PreTranslateMessage(pMsg); s&8QRI.
} N:"E%:wSbi
1)%9h>F7
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E
hd*
{ }{]{`\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {[)J~kC+
SaveBmp(); #t3ju^ |?
return FALSE; 8.]dThaq
} 7&m*:
J
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NoDq4>
CMenu pop; ]7'Q2OU7
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); C.pNDpx-
CMenu*pMenu=pop.GetSubMenu(0); Gh42qar`
pMenu->SetDefaultItem(ID_EXITICON); ?Mji'ZW}
CPoint pt; #Cbn"iYee
GetCursorPos(&pt); 4.CLTy3W
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _3hCu/BV
if(id==ID_EXITICON) r{6 ,;
DeleteIcon(); pEhWgCL
else if(id==ID_EXIT) Qzb8*;4?FF
OnCancel(); w;r -TLf
return FALSE; B3XVhUP
} <[l2 ]"Q
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `I_%`1 5>
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fs~n{z,ja%
AddIcon(); v_)cp9d]
return res; zS|%+er~zO
} ~''qd\.f$
X3X~`~bAD
void CCaptureDlg::AddIcon() >nvreis
{ SZvw>=)a
NOTIFYICONDATA data; ruF+X)
data.cbSize=sizeof(NOTIFYICONDATA); P%B1dRa
CString tip; u+th?KO`
tip.LoadString(IDS_ICONTIP); -"!V&M
data.hIcon=GetIcon(0); ] p'+F
data.hWnd=GetSafeHwnd(); hMhD(X
strcpy(data.szTip,tip); <Hm:#<\
data.uCallbackMessage=IDM_SHELL; +S0A`rL
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B:+}^=
data.uID=98; >D<nfG<s Z
Shell_NotifyIcon(NIM_ADD,&data); {&w%3
ShowWindow(SW_HIDE); MH{vFA4:,
bTray=TRUE; kD MS7y<s
} ((;9%F:/$
YJeZ{Wws
void CCaptureDlg::DeleteIcon() v+G}n\F
{ vk;>#yoox
NOTIFYICONDATA data; rv|k8
data.cbSize=sizeof(NOTIFYICONDATA); |mY<TWoX
data.hWnd=GetSafeHwnd(); ,<pql!B-
data.uID=98; PX2Ejrwj
Shell_NotifyIcon(NIM_DELETE,&data); y%ER51+
ShowWindow(SW_SHOW); ) : Q5u6
SetForegroundWindow(); vlzjALy
ShowWindow(SW_SHOWNORMAL); alHwN^GhP
bTray=FALSE; &\Cvrxa
} h/-7;Csv
kFD-
void CCaptureDlg::OnChange() !j YV,:'
{ ,,BNUj/:
RegisterHotkey(); 0Xk;X1Xl
} pok,`yW\
}})4S;j
BOOL CCaptureDlg::RegisterHotkey() |nU:
{ 9n8;eE08
UpdateData(); 3%|<U51
UCHAR mask=0; |W:kzTT-T
UCHAR key=0; hw~cS7
if(m_bControl) aoF>{Z4&B
mask|=4; [k."R@?
if(m_bAlt) u!L8Sv
mask|=2; @J"
} ~Y
if(m_bShift) F<IqKgGzH
mask|=1; {6/%w,{,
key=Key_Table[m_Key.GetCurSel()]; xW"J@OiKL
if(bRegistered){ Q&M(wnl5
DeleteHotkey(GetSafeHwnd(),cKey,cMask); rD$7;
bRegistered=FALSE; c%uhQ62
} K<+AJ(C
cMask=mask; %$sWNn
cKey=key; wJ IJPYTK
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #+ n
&
return bRegistered; |l)Oy#W
} -P'>~W,~
,FBF;zED
四、小结 HJg)c;u/2;
O5k's
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。