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:
oaMh5FPy
;UoXj+Z 一、实现方法
W;y ,Xs qytH<UB 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:
>X0c:pPu T*v@hbJ #pragma data_seg("shareddata")
b_%W*Q HHOOK hHook =NULL; //钩子句柄
C=!YcJ9 UINT nHookCount =0; //挂接的程序数目
p({)ZU3 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
n.tJ-l5[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
O9jpt>:kZ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
GJP\vsaQ static int KeyCount =0;
fNNik7 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
vgbk
{ #pragma data_seg()
OYwH$5 [>xGynU0 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
[X=J]e^D @ 9q/jv` DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
A_xUP9g@? 9!UFLZR BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
h&Q9 cKey,UCHAR cMask)
O({vHqN> {
MsLQ'9%Au BOOL bAdded=FALSE;
t]PO4GA for(int index=0;index<MAX_KEY;index++){
UCDvN if(hCallWnd[index]==0){
u[yUUYe hCallWnd[index]=hWnd;
ZW>?y$C+ HotKey[index]=cKey;
{H$m1=S HotKeyMask[index]=cMask;
BBUXoz bAdded=TRUE;
i=DoK{`L KeyCount++;
8"2X 8C8 break;
.pd_SQ~ }
9_5tA'Q }
WzxDnd<B return bAdded;
50J"cGs~ }
Q?"-[6[v //删除热键
@o6^" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
53jtwklA {
L.1pO2zPe BOOL bRemoved=FALSE;
Bp:i[9w for(int index=0;index<MAX_KEY;index++){
8jxs%N,aI if(hCallWnd[index]==hWnd){
PN@[k:5( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I~:
AWS9 hCallWnd[index]=NULL;
fsVQZ$h73 HotKey[index]=0;
^7O,Vk"Z HotKeyMask[index]=0;
G: p!PB>= bRemoved=TRUE;
d/3
k3HdL KeyCount--;
8 ?+t+m[ break;
6:o?@% }
>xa k }
4zw5?$YWO" }
%U$PcHOo return bRemoved;
2gC.Z:} }
tE>hj:p ]/C1pG*o ob3Z
I DLL中的钩子函数如下:
l|onH;g\ <D!\"C LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$xU5vCwAo {
KN"V(<!)~ BOOL bProcessed=FALSE;
_8G if(HC_ACTION==nCode)
|[]"{Eo"} {
2n`OcXCh/ if((lParam&0xc0000000)==0xc0000000){// 有键松开
'G-zJcU switch(wParam)
*=O~TY<]( {
/92m5p case VK_MENU:
V9o_Q MaskBits&=~ALTBIT;
>kJEa8 break;
h
r!Htew4 case VK_CONTROL:
V/jEMJNks MaskBits&=~CTRLBIT;
Q<F-l.q break;
_a3,Zuv case VK_SHIFT:
;2=H7dq MaskBits&=~SHIFTBIT;
_Xn[G>1 break;
d;kdw default: //judge the key and send message
Y)=89s&t break;
E'J| p7 }
8}0O @ wq for(int index=0;index<MAX_KEY;index++){
jLEwFPz if(hCallWnd[index]==NULL)
Zg@NMT continue;
i1#\S0jN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L*VO2YI {
UEvRK?mm= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9V%s1@K bProcessed=TRUE;
Ba],ONM4k }
*CH lg1 }
<Eo;CaaF/ }
_e;$Y#`EO else if((lParam&0xc000ffff)==1){ //有键按下
z$d/Vz,a switch(wParam)
,\FJVS;NeJ {
Y M_\ ZK: case VK_MENU:
i-b++R/WN MaskBits|=ALTBIT;
7xOrG],E break;
[V5ebj:6w case VK_CONTROL:
]tVU$9D MaskBits|=CTRLBIT;
x_JCH7- break;
tfr*/+F case VK_SHIFT:
C#<:x! MaskBits|=SHIFTBIT;
XZv(B^ break;
~7W?W< default: //judge the key and send message
IQS:tL/ break;
T>&d/$;]
}
1r?<1vh:z for(int index=0;index<MAX_KEY;index++){
OgiElA. if(hCallWnd[index]==NULL)
\S)\~>.`y! continue;
NY'sZTM& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(o1*7_]e {
_U.D*f<3) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
n+M:0{Y| bProcessed=TRUE;
.O{2]e$ }
4dXuy>Km }
J>YwMl }
=8r%zLDw if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
3hOiHO
; for(int index=0;index<MAX_KEY;index++){
h7NS9CgO
if(hCallWnd[index]==NULL)
jB*%nB*x continue;
ZkW, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
a{7>7%[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Uj)~ >V' //lParam的意义可看MSDN中WM_KEYDOWN部分
,c@^u6a }
XHgwK@GU }
y#:_K(A" k }
krPwFp2[* return CallNextHookEx( hHook, nCode, wParam, lParam );
P"J(O<(1-: }
4|uh&4"*@W 6uCa iPV 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:
k[]B
P4 %X Jv;| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
zo-hH8J: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
!F*7Mif_E O+Fu zCWj 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:
gRS}Y8 ){|Bh3XV LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
*.0}3 {
GqXnOmk if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
{H+~4XG {
)\C:| //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
J#7\R':}zl SaveBmp();
kzqW&`xn? return FALSE;
;Ft_ Xiq }
LMf_wsp …… //其它处理及默认处理
_ cK"y2 }
IcMfZ{H1 [];*9vxW 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。
>(s)S[\ 31\l0Jg 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。
:b[
[}' O(8Px 二、编程步骤
5:%xuJD ~6z<tyD^ 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";
{OP[Rrm )UA};Fus 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
*p}b_A}D 4k5X'&Q 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;
_jOu`1w Y<0;;tVf4U 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;
$<.\,wW*'w !rzbm&@ 5、 添加代码,编译运行程序。
79|=y7i# dd#=_xe 三、程序代码
\jDD=ew Bb2;zOGdA ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
XBE+O7 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
=X[]0.I% #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
j:# wt70 #if _MSC_VER > 1000
`9BZ))Pg #pragma once
<H{%` #endif // _MSC_VER > 1000
fmf3Hp@ #ifndef __AFXWIN_H__
;*^2,_ #error include 'stdafx.h' before including this file for PCH
+G';no\h #endif
`iYiAc #include "resource.h" // main symbols
0b%"=J2/p. class CHookApp : public CWinApp
#~l(t_m{ {
~Ts^z(v~D2 public:
vt@5Hb) CHookApp();
n $RhD93 // Overrides
'thWo wE // ClassWizard generated virtual function overrides
n4; //{{AFX_VIRTUAL(CHookApp)
'\8gY((7 public:
k%|7H,7 virtual BOOL InitInstance();
Atc<xp virtual int ExitInstance();
:ulOG{z //}}AFX_VIRTUAL
H`#{zt); //{{AFX_MSG(CHookApp)
p|!5G&O, // NOTE - the ClassWizard will add and remove member functions here.
U5N/'p%)< // DO NOT EDIT what you see in these blocks of generated code !
e&WlJ //}}AFX_MSG
lXH?* DECLARE_MESSAGE_MAP()
e P]L };
Y;$wD9W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
{"T$jV:GB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
tHAr9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
HriY-=ji>a BOOL InitHotkey();
:.wR *E BOOL UnInit();
.J0s_[ #endif
bBwQ1,c$ iV#sMJN9 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
%M8m 8
) #include "stdafx.h"
{;uOc{~+ #include "hook.h"
5}S~8 #include <windowsx.h>
nBw4YDR! #ifdef _DEBUG
{~J'J $hn8 #define new DEBUG_NEW
coa+@g,w7# #undef THIS_FILE
4D+S\S0bk static char THIS_FILE[] = __FILE__;
d:C|laZHn #endif
LpCJfQ #define MAX_KEY 100
a"7zz]XO2 #define CTRLBIT 0x04
~6YTm6o #define ALTBIT 0x02
xQLVFgd #define SHIFTBIT 0x01
@r7ekyO8) #pragma data_seg("shareddata")
/Kcp9Qx HHOOK hHook =NULL;
P2la/jN UINT nHookCount =0;
bMe/jQuL.$ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
f793yCiG static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
zh8\
_>+ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
+9LIpU&5 static int KeyCount =0;
je_:hDr static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
= BcKWC #pragma data_seg()
[]^fb,5a HINSTANCE hins;
jSi\/(E void VerifyWindow();
=.T50~+M BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
UnTnc6Bo7W //{{AFX_MSG_MAP(CHookApp)
@ sLb=vb // NOTE - the ClassWizard will add and remove mapping macros here.
{}gx;v) // DO NOT EDIT what you see in these blocks of generated code!
BwpEIV@b] //}}AFX_MSG_MAP
zciL'9 END_MESSAGE_MAP()
:wWPEhK lICpfcc(+ CHookApp::CHookApp()
\!`k:lusa {
@8\7H'K"\ // TODO: add construction code here,
MZJ@qIg[Y // Place all significant initialization in InitInstance
v_U+wga }
i2bkgyzB. 'uy\vR&Pz CHookApp theApp;
?2d! ^!9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7 ) Q>R {
:Vdo.uUa BOOL bProcessed=FALSE;
i|N%dl+T= if(HC_ACTION==nCode)
:$k]; {
K=Q<G:+&V if((lParam&0xc0000000)==0xc0000000){// Key up
Bs?B\k= switch(wParam)
eKpWFP0 {
^@91BY case VK_MENU:
Hs9; &C MaskBits&=~ALTBIT;
Q[rmsk2L' break;
PMOyZ3 case VK_CONTROL:
{H F,F=W MaskBits&=~CTRLBIT;
Y\7WCaSgi break;
~F)[H'$A case VK_SHIFT:
{Q?\%4>2 MaskBits&=~SHIFTBIT;
O@9<7@h+Nl break;
oItEGJ| default: //judge the key and send message
<GdQ""X break;
\US'tF)/ }
62s0$vw for(int index=0;index<MAX_KEY;index++){
e-&0f);i if(hCallWnd[index]==NULL)
|.]g&m)y^h continue;
FdwlRu G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\d:AV(u {
5xb1FH d: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
PxAUsY bProcessed=TRUE;
6gy;Xg }
KU;d[Z@g }
s?j || }
K>a@AXC else if((lParam&0xc000ffff)==1){ //Key down
bM@8[&ta switch(wParam)
g$?kL {
wC&+nS1 case VK_MENU:
w?JRY MaskBits|=ALTBIT;
xZE%Gf_U break;
Xi
8rD"v case VK_CONTROL:
S+*%u/;l MaskBits|=CTRLBIT;
A_pcv7=@ break;
sKCfI] case VK_SHIFT:
;NoD4* MaskBits|=SHIFTBIT;
fkHCfcU break;
ov xX.hO default: //judge the key and send message
sjW;Nsp break;
sUe<21: }
6+.8nx:9X for(int index=0;index<MAX_KEY;index++)
Jf</83RZ {
j&y>?Y&Sb if(hCallWnd[index]==NULL)
}L|cg2y continue;
7g%.:H= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^U;r>[T9h {
h.t2 ;O, b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
35}]U= bProcessed=TRUE;
PrQs_tNi }
,6Ua+\| }
?S2!'L }
yN/Uyhq if(!bProcessed){
i
w(4!,4~ for(int index=0;index<MAX_KEY;index++){
b^dBX if(hCallWnd[index]==NULL)
w8KVs\/ continue;
nW"ml$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
sry`EkS SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
A<*G; }
w~|z0;hC }
* .P3fVlZ }
Jc9BZ`~i return CallNextHookEx( hHook, nCode, wParam, lParam );
3:B4; }
_/pdZM,V %CaF-m=Pq BOOL InitHotkey()
x6iT"\MO {
^v+7IFn if(hHook!=NULL){
kf-/rC)> nHookCount++;
j"Y5j
B` return TRUE;
D//uwom }
gZ 6Hj62D else
L9bIdiB7 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
r>kDRIHB if(hHook!=NULL)
i-W!`1LH' nHookCount++;
IzWS6!zKU return (hHook!=NULL);
oc0z1u }
mA" 82" BOOL UnInit()
JANP_b:t {
Xxmvg.Nl if(nHookCount>1){
OE8H |?% nHookCount--;
^(.utO return TRUE;
k<.VR"I
p }
@'lO~i BOOL unhooked = UnhookWindowsHookEx(hHook);
no
UXRQ if(unhooked==TRUE){
R1j)0b6cQ% nHookCount=0;
=>u9k:('9 hHook=NULL;
];7/DM#Np }
X)^&5;\` return unhooked;
\CK f/:" }
a";xG,U -)o0P\cTEt BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$8t\|O3 {
?YA5g' l BOOL bAdded=FALSE;
PTf.(B"z for(int index=0;index<MAX_KEY;index++){
F qH@iZ if(hCallWnd[index]==0){
zrazFI0G hCallWnd[index]=hWnd;
Z:kX9vw. HotKey[index]=cKey;
nv-_\M HotKeyMask[index]=cMask;
+jrMvk" bAdded=TRUE;
m
L,El2 KeyCount++;
:978D0}{p break;
jb
{5
}
6u-aV }
YThFskR oO return bAdded;
@K}8zMmW# }
h"849c;C. Yv7`5b{N. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+`$[h2Z=: {
otSF8[ BOOL bRemoved=FALSE;
{S=gXIh(y for(int index=0;index<MAX_KEY;index++){
$0wF4$) if(hCallWnd[index]==hWnd){
h 1`yW#% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
t1%<l hCallWnd[index]=NULL;
Q"QL#<N HotKey[index]=0;
.!`v2_ HotKeyMask[index]=0;
eF%IX bRemoved=TRUE;
v:w $l{7 KeyCount--;
=^D{ZZw{ break;
oEuo@\U05v }
B'`
jdyaE9 }
iT}L9\ }
O:86* return bRemoved;
\&)k{P>= }
Q{))+'s2h 8~s-@3J void VerifyWindow()
AcCM
W@e {
`h+1u`FJ for(int i=0;i<MAX_KEY;i++){
nbM7 >tnsk if(hCallWnd
!=NULL){ .}||!
if(!IsWindow(hCallWnd)){ RI2Or9.
hCallWnd=NULL; x|oa"l^JZ"
HotKey=0; 2`]_c=
HotKeyMask=0; Qx% ]u8s
KeyCount--;
W;9Jah.
} Me|+)}'p5h
} twA2U7F
} 0-{l4;o
} G*$a81dAX
VtJy0OGcRP
BOOL CHookApp::InitInstance() t1h2ibO
{ TPeBb8v8D
AFX_MANAGE_STATE(AfxGetStaticModuleState()); {cF>,T
hins=AfxGetInstanceHandle(); `9yR,Xk=l
InitHotkey(); \mt>R[
return CWinApp::InitInstance(); X/!37
} 7h3JH
FeM,$&G:
int CHookApp::ExitInstance() -$J%.fdPs
{ Z" !+p{u
VerifyWindow(); 68v59)0U
UnInit(); c6NCy s
return CWinApp::ExitInstance(); J@I-tS
} 9v2(cpZ
[Y^1}E*
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <fLk\
=
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I$7TnMug
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !Ho=(6V
#if _MSC_VER > 1000 D;l)&"|r?
#pragma once LN?b6s75U
#endif // _MSC_VER > 1000 0Q_@2
al3[Ph5G
class CCaptureDlg : public CDialog nPj/C7j
{ LpJ_HU7@lk
// Construction 0- 'f1 1S
public: ,B<Tt|'
BOOL bTray; G$buZspL'd
BOOL bRegistered; 389puDjy
BOOL RegisterHotkey(); `*1059
UCHAR cKey; ^9Je8 @Yu
UCHAR cMask; "[LSDE"(
void DeleteIcon(); VC6S4FU4K
void AddIcon(); @$( /6]4p
UINT nCount; +y Yv"J
void SaveBmp(); 8'kA",P
CCaptureDlg(CWnd* pParent = NULL); // standard constructor B?xu!B,
// Dialog Data ZoiCdXvTN
//{{AFX_DATA(CCaptureDlg) XU}sbbwu
enum { IDD = IDD_CAPTURE_DIALOG }; ]GS@ ub
CComboBox m_Key; .2jG~_W[
BOOL m_bControl; pSq3\#Twr
BOOL m_bAlt; #^bkM)pc
BOOL m_bShift; [@qUQ,Ie
CString m_Path; bh8IF,@a
CString m_Number; 32flOi:
//}}AFX_DATA Odo"S;)
// ClassWizard generated virtual function overrides ')ErXLP_
//{{AFX_VIRTUAL(CCaptureDlg) &dV|~xA6N
public: FB0y
virtual BOOL PreTranslateMessage(MSG* pMsg); I 2!0,1Q
protected: Yz?1]<X
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1/bu}?a
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mYudUn4Wo
//}}AFX_VIRTUAL c9dH ^t
// Implementation ~la=rh3
protected: Wh,{|R[
HICON m_hIcon; :q2tda
// Generated message map functions cJ%u&2J_
//{{AFX_MSG(CCaptureDlg) .+H8c.
virtual BOOL OnInitDialog(); QPH2TXw
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); M- 2:$;D
afx_msg void OnPaint(); "$Wi SR
afx_msg HCURSOR OnQueryDragIcon(); <9S?wju4W'
virtual void OnCancel(); KJwkkCE/=
afx_msg void OnAbout(); I]`>m3SJ
afx_msg void OnBrowse(); 2wWL]`(E
afx_msg void OnChange(); z:aT5D
//}}AFX_MSG COw]1R
DECLARE_MESSAGE_MAP() 9GdrJ~h
}; `O5kI#m)L*
#endif TXi$Q%0W
({cgak
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j${:Y$VmE
#include "stdafx.h" UC^Bn1
#include "Capture.h" W"rX$D[Le
#include "CaptureDlg.h" 1GY[1M1^
#include <windowsx.h> c
25wm\\
#pragma comment(lib,"hook.lib") }0#cdw#gH
#ifdef _DEBUG cz/mUU
#define new DEBUG_NEW v UAYYe
#undef THIS_FILE 4[]R?lL
static char THIS_FILE[] = __FILE__; U4_<
#endif *|x2"?d-F:
#define IDM_SHELL WM_USER+1 -#b-@sD
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -;z&">
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q^v8n1
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *n0k2 p
class CAboutDlg : public CDialog WT!8.M;Kv
{ #[*e$C
public: FeS6>/
CAboutDlg(); $}S5&
// Dialog Data zjh&?G]:G
//{{AFX_DATA(CAboutDlg) '[p~|
mX
enum { IDD = IDD_ABOUTBOX }; 3MC| O5R4
//}}AFX_DATA lX`)Avqa
// ClassWizard generated virtual function overrides $&m^WrZaY
//{{AFX_VIRTUAL(CAboutDlg) nm*!#hx
protected: $7aR f'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lC6#EU;
//}}AFX_VIRTUAL Kbc-$oneR
// Implementation YE5v~2
protected: sHe:h XG'
//{{AFX_MSG(CAboutDlg) '?Q [.{<
//}}AFX_MSG &_&])V)<\S
DECLARE_MESSAGE_MAP() `X]-blHo
}; F'Fc)9qFa<
WjGv%^?
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) J%xp1/=2
{ .9WUp>
//{{AFX_DATA_INIT(CAboutDlg) |rf\]3 F
//}}AFX_DATA_INIT gtz!T2%
} hX=+%^c%_A
qJW>Y}
void CAboutDlg::DoDataExchange(CDataExchange* pDX) DRi!WWivn
{ muo7KUT
CDialog::DoDataExchange(pDX); 1uv"5`%s
//{{AFX_DATA_MAP(CAboutDlg) hE!3kaS
//}}AFX_DATA_MAP doXd6q4H
} E8>npDFv.
3l>P>[<o
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IqEY.2KN
//{{AFX_MSG_MAP(CAboutDlg) L]#J?lE&
// No message handlers Ydmz!CEu
//}}AFX_MSG_MAP oC U8;z
END_MESSAGE_MAP() gsc*![N
/w!b2KwV
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)
nP?(9;3*
: CDialog(CCaptureDlg::IDD, pParent) p7 !q#o
{ P-No;/!B#
//{{AFX_DATA_INIT(CCaptureDlg) tF&%7(EU3
m_bControl = FALSE; uGJeQ
m_bAlt = FALSE; \XMl8G
m_bShift = FALSE; Lq
LciD
m_Path = _T("c:\\"); )TM ![^d
m_Number = _T("0 picture captured."); +:It1`A~]
nCount=0; +F 6KGK[
bRegistered=FALSE; 6%ID*
bTray=FALSE; uGLVY%N
//}}AFX_DATA_INIT HqOSQ<-Fo
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 v{=-#9-4
&
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q%QpG)E
} X!,Ngmw.
-H.;73Kb[
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #>~$`Sg
{ h&yaug,.
CDialog::DoDataExchange(pDX); Y*f7& '[
//{{AFX_DATA_MAP(CCaptureDlg) >K-O2dry*
DDX_Control(pDX, IDC_KEY, m_Key); c.&vWmLSGE
DDX_Check(pDX, IDC_CONTROL, m_bControl); jRB:o?S
DDX_Check(pDX, IDC_ALT, m_bAlt); cY#TH|M
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~AK!_EOs`
DDX_Text(pDX, IDC_PATH, m_Path); ;'tsdsu}
DDX_Text(pDX, IDC_NUMBER, m_Number); `"(7)T{
//}}AFX_DATA_MAP )J (ekfM
} >6ch[W5k@
$F G4wA
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0,m*W?^31
//{{AFX_MSG_MAP(CCaptureDlg) yQ+#Tlji
ON_WM_SYSCOMMAND() 5qG7LO.
ON_WM_PAINT() EE&~D~yHUL
ON_WM_QUERYDRAGICON() I U4[}x
ON_BN_CLICKED(ID_ABOUT, OnAbout) ?b8NEVjw
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 15U=2j*.b
ON_BN_CLICKED(ID_CHANGE, OnChange) =q5A@!D
//}}AFX_MSG_MAP G!OD7:
END_MESSAGE_MAP() )KBv[|
FNmIXpAn*@
BOOL CCaptureDlg::OnInitDialog() <`|}bt
{ ,[Cl 'B
CDialog::OnInitDialog(); [b;Oalw
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Ylt[Ks<2
ASSERT(IDM_ABOUTBOX < 0xF000); %F&j B
CMenu* pSysMenu = GetSystemMenu(FALSE); g:;v]
if (pSysMenu != NULL) S3qUzK
{ g"C$B Fc
CString strAboutMenu; r7ywK9UL
strAboutMenu.LoadString(IDS_ABOUTBOX); tk}qvW.Ii
if (!strAboutMenu.IsEmpty()) ,*S?L
qv^
{ pBL{DgX
pSysMenu->AppendMenu(MF_SEPARATOR); "t"dz'
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Uk;SY[mU
} 4ItXZ o
} T
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SetIcon(m_hIcon, TRUE); // Set big icon `2S{.s
SetIcon(m_hIcon, FALSE); // Set small icon eIof{#
m_Key.SetCurSel(0); zq4mT;rqz
RegisterHotkey(); Cn28&$:J
CMenu* pMenu=GetSystemMenu(FALSE); L<8y5B~W
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e|MyA?`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); e>z7?"N
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \3)%p('
return TRUE; // return TRUE unless you set the focus to a control A%+~
} >t*zY~R.
7qW:^2y
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Sk;IAp#X9
{ msY"Y*4
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Vaq=f/
{ #M`ijN!Y
CAboutDlg dlgAbout; um3
M4>K
dlgAbout.DoModal(); o"n^zG
} 8`u#tl(
else _/E>38G]
{ N.-Ryj&9
CDialog::OnSysCommand(nID, lParam); T5-4Q
} G|^gaj '9
} 5>A3;P
iNQk{n
void CCaptureDlg::OnPaint() $(zJ
{ 1Kc*MS
if (IsIconic()) qM1$?U
{ &LL81u6=S
CPaintDC dc(this); // device context for painting ^@[[,1"K
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2EK\QW o
// Center icon in client rectangle ^x/0*t5};z
int cxIcon = GetSystemMetrics(SM_CXICON); 8~2A"<{ub
int cyIcon = GetSystemMetrics(SM_CYICON); Y
=`3L
CRect rect; Z6h.gaQ7
H
GetClientRect(&rect); ~}ewna/2
int x = (rect.Width() - cxIcon + 1) / 2; DMs|Q$XB
int y = (rect.Height() - cyIcon + 1) / 2; bQ
.y,+
// Draw the icon lsio\ $
dc.DrawIcon(x, y, m_hIcon); /#,<>EfT
} 8d$~wh
else rSEJ2%iF*
{ r2sog{R
CDialog::OnPaint(); dOiy[4s
} ut\9@>*J=Q
} `kj7I{'l%9
Yhlk#>I
HCURSOR CCaptureDlg::OnQueryDragIcon() Rf%ver
{ <:&w/NjbI
return (HCURSOR) m_hIcon; Nz:
} mZM5aTQ3
g|r
void CCaptureDlg::OnCancel()
dc5B#
{ R2~Rqlti
if(bTray) BAKfs/N
DeleteIcon(); t}oxHEa V
CDialog::OnCancel(); eq4<
} e |4jT7L}
hF2
G{{8A
void CCaptureDlg::OnAbout() =lDmP|^
{ TR%?U/_4;r
CAboutDlg dlg; YK[O#V
dlg.DoModal(); 9f"6Jw@F
} Wq>j;\3b3
mU\$piei
void CCaptureDlg::OnBrowse() r% B5@+{so
{ xMuy[)b
CString str;
"= UP&=
BROWSEINFO bi; KY"~Ta`
char name[MAX_PATH]; foJ|Q\Z,T
ZeroMemory(&bi,sizeof(BROWSEINFO)); #o^E1cI
bi.hwndOwner=GetSafeHwnd(); ;hZ(20
bi.pszDisplayName=name; GuS3O)6Sg
bi.lpszTitle="Select folder"; .OWIlT4K
bi.ulFlags=BIF_RETURNONLYFSDIRS; *aT!|;
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `\.n_nM
if(idl==NULL) 0`qq"j[6a
return; sY#K=5R
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hnY^Z_v!
str.ReleaseBuffer(); (8EZ,V:
m_Path=str; q&W#nWBV
if(str.GetAt(str.GetLength()-1)!='\\') ]kKsGch
m_Path+="\\"; mV4} -
UpdateData(FALSE); W%$p,^@S5
} 'Klz`)F
X G^
void CCaptureDlg::SaveBmp() h|-r t15
{ $u"K1Q3
CDC dc; 5VPuHY2
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6>vj({,1Y*
CBitmap bm; 0<Pe~i_=
int Width=GetSystemMetrics(SM_CXSCREEN); @ ?%"nK
int Height=GetSystemMetrics(SM_CYSCREEN); i2!{.*.
bm.CreateCompatibleBitmap(&dc,Width,Height); :8)4:4$^
CDC tdc; K8RloDjk_A
tdc.CreateCompatibleDC(&dc); uV\=EDno
CBitmap*pOld=tdc.SelectObject(&bm); vu#:D1/BB
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <w:fR|O
tdc.SelectObject(pOld); C<7J5
BITMAP btm; ! TRiFD
bm.GetBitmap(&btm); %-SP
DWORD size=btm.bmWidthBytes*btm.bmHeight; ~&qe"0
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I7Eg$J&
BITMAPINFOHEADER bih; M1g|m|H7
bih.biBitCount=btm.bmBitsPixel; '"KK|]vJ
bih.biClrImportant=0; U{_O=S u
bih.biClrUsed=0; >H%8~ Oek
bih.biCompression=0; #".{i+3E
bih.biHeight=btm.bmHeight; aY?}4Bx
bih.biPlanes=1; ]v#T'<Nl
bih.biSize=sizeof(BITMAPINFOHEADER); 6zI?K4o
bih.biSizeImage=size; ?IWLl
bih.biWidth=btm.bmWidth; L NE]#8ue
bih.biXPelsPerMeter=0; {&4qknPd%
bih.biYPelsPerMeter=0; $Z,+aLmb
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mee-Qq:}
static int filecount=0; UU !I@
CString name; !#?tA/t@
name.Format("pict%04d.bmp",filecount++); <
xV!vN
name=m_Path+name; v>e4a/
BITMAPFILEHEADER bfh; +HcH]D;
bfh.bfReserved1=bfh.bfReserved2=0; m[7a~-3:J
bfh.bfType=((WORD)('M'<< 8)|'B'); $i2gOz
bfh.bfSize=54+size; <l6CtK@
bfh.bfOffBits=54; .9E`x>C
CFile bf; t+#Ss v8
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Iq52rI}
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jQdfFR
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |On6?5((e
bf.WriteHuge(lpData,size); mPh;
bf.Close(); LnL<WI*Pq
nCount++; fU8;CZnx
} m|y]j4
GlobalFreePtr(lpData); *X>rvAd3
if(nCount==1) [v&_MQ
m_Number.Format("%d picture captured.",nCount); *%8us~w5/
else iVl"H@m/
m_Number.Format("%d pictures captured.",nCount); K~E]Fkw!;
UpdateData(FALSE); Ue\&
} 2V0R|YUt
f[ v??^
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jc?Hip'
{ 4 I~,B[|
if(pMsg -> message == WM_KEYDOWN) f9rToH
{ ywdNwNJ
if(pMsg -> wParam == VK_ESCAPE) Y#m0/1-
return TRUE; KOxD%bX_
if(pMsg -> wParam == VK_RETURN) OGVhb>LO1
return TRUE; T]myhNk
} o4J K$%
return CDialog::PreTranslateMessage(pMsg); %DN&K
} zz9.OnZ~
Vy?w,E0^:
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BkJcT
{ '2vlfQ@8a~
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &sllM
SaveBmp(); _]4cY%s
return FALSE; *kIJv?%_}
} C$hsR&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <FJ#Hy+
CMenu pop; gsR"d@!
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); vS0P]AUo
CMenu*pMenu=pop.GetSubMenu(0); byMO&Lb*
pMenu->SetDefaultItem(ID_EXITICON); r9%W?fEBp
CPoint pt; _Nj;Ni2rD
GetCursorPos(&pt); "K@os<
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); vKW%l
if(id==ID_EXITICON) ;L`'xFo>>
DeleteIcon(); #8RQ7|7b|
else if(id==ID_EXIT) &@Q3CCDS
OnCancel(); f+1]#"9i|
return FALSE; V*AG0@&!
} qB&*"gf
LRESULT res= CDialog::WindowProc(message, wParam, lParam); a2i
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j4l7Tx
AddIcon(); (I+-wki"e
return res; x|Ei_hI-
} v|"{x&I.
=:2V4H(F
void CCaptureDlg::AddIcon() 3)xV-Y9
{ -{w&ya4X
NOTIFYICONDATA data; k-89(
data.cbSize=sizeof(NOTIFYICONDATA); Uarb
[4OZ
CString tip; WFB2 Ub7
tip.LoadString(IDS_ICONTIP); *0iP*j/]
data.hIcon=GetIcon(0); qV}zV\Nz
data.hWnd=GetSafeHwnd(); _3E7|drIX
strcpy(data.szTip,tip); $""[(
d?0
data.uCallbackMessage=IDM_SHELL; 7!%cKZCY
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $ey<8qzp
data.uID=98; h8h4)>:
Shell_NotifyIcon(NIM_ADD,&data); A ssf
f;
ShowWindow(SW_HIDE); |hpm|eZG"h
bTray=TRUE; NBeGmC|
} Qj=l OhM
R_*\?^k|A
void CCaptureDlg::DeleteIcon() "L,FUo^&
{ cVz.ac
NOTIFYICONDATA data; Wb|IWnH$
data.cbSize=sizeof(NOTIFYICONDATA); YgDgd\
data.hWnd=GetSafeHwnd(); T#( s2
data.uID=98; S)~h|&A(
Shell_NotifyIcon(NIM_DELETE,&data); =DtM.oQ>
ShowWindow(SW_SHOW); xJ3#k;
SetForegroundWindow(); [$./'-I]
ShowWindow(SW_SHOWNORMAL); @wg*~"d
bTray=FALSE; Y,8M[UIK
} $HH(8NoL
*s!8BwiE
void CCaptureDlg::OnChange() _
x7Vyy5
{ :4WwCpgz,
RegisterHotkey(); Y3-P*
} 3!d|K%J
uM\~*@
BOOL CCaptureDlg::RegisterHotkey() fEpY3od
{ ja:%j&:
UpdateData(); (YR] X_
UCHAR mask=0; o`#;[
UCHAR key=0; %xg"e
O2x
if(m_bControl) !qcR5yk`2
mask|=4; R1SEv$
if(m_bAlt) 8U8"k
mask|=2; m xWaXb
if(m_bShift) UA/3lH}
mask|=1; D8h~?phK
key=Key_Table[m_Key.GetCurSel()]; q/Gy&8
K
if(bRegistered){ [<%yU y
DeleteHotkey(GetSafeHwnd(),cKey,cMask); u54+oh|,M
bRegistered=FALSE; $;@s
} 8kqxr&,[
cMask=mask; *</;:?
cKey=key; b\^.5SEw
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /fD)/x
return bRegistered; >N*QK6"=|
} 4];NX
h)YqC$A-s
四、小结 p<![JeV
wRuJein#
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。