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:
y,Jh@n';|
_pW_G1U 一、实现方法
Av o|v> P|N2R5(>T 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:
G8eD7%{b:) zCt\o #pragma data_seg("shareddata")
ygN>"eP HHOOK hHook =NULL; //钩子句柄
um7o !yg, UINT nHookCount =0; //挂接的程序数目
Ry&q1j static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
)>\4ULR83 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
!DPF7x(-{ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
61} i5o static int KeyCount =0;
/t*YDWLg static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
`z9J`r=I #pragma data_seg()
#;]2=@ .oEbEs 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。
wd/G|kNO 3Hw[s0[$ 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:
;FU|7L$H B8 H75sz BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
k^%2_H cKey,UCHAR cMask)
bHE7yv [ {
nU2V]-qY BOOL bAdded=FALSE;
b0rX QMu for(int index=0;index<MAX_KEY;index++){
)s)_XL if(hCallWnd[index]==0){
=LI:S|[4 hCallWnd[index]=hWnd;
eCWPhB6l HotKey[index]=cKey;
dQD$K|aUp HotKeyMask[index]=cMask;
sHdp bAdded=TRUE;
_\\ -md: KeyCount++;
M(enRs3`O break;
L2fZ{bgy }
,(N[*)G }
)o{aeV return bAdded;
m2xBS!fm }
io.]'"> //删除热键
.IgRY\?Q BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
K*Ks"Vx {
uFG<UF BOOL bRemoved=FALSE;
gzf-)J for(int index=0;index<MAX_KEY;index++){
e"k/d< if(hCallWnd[index]==hWnd){
OX\$ nQ\o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
W\8Ln> hCallWnd[index]=NULL;
Z(e^ iH HotKey[index]=0;
+BL{@,zr HotKeyMask[index]=0;
~}'F887 f bRemoved=TRUE;
SJk>Jt= KeyCount--;
A_R!uRD8- break;
ys8Q.oBv_` }
)&,{?$ . }
Qs9OC9X1 }
&eQJfc\a return bRemoved;
O("Uq../3 }
.Q* 'r&n gmP9j)V6 19t{|w< DLL中的钩子函数如下:
z)-c#F@% W2]TRO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@0NJ{ {
|yKud BOOL bProcessed=FALSE;
&;c>O if(HC_ACTION==nCode)
)h_8vO2 {
(dqCa[ if((lParam&0xc0000000)==0xc0000000){// 有键松开
=-#G8L%Q switch(wParam)
MsOs{2
)2 {
w5,Mb case VK_MENU:
[syj# MaskBits&=~ALTBIT;
3^,QIG break;
iPj~I case VK_CONTROL:
^YlI>_3s MaskBits&=~CTRLBIT;
wRvb8F0 break;
Z9K})47T case VK_SHIFT:
gb" 4B%Hm MaskBits&=~SHIFTBIT;
DHw<%Z-J break;
W0I4Vvh_" default: //judge the key and send message
8)j@aiF` break;
eE(b4RCM }
skg|>R,kE for(int index=0;index<MAX_KEY;index++){
n V&cC if(hCallWnd[index]==NULL)
Bp? continue;
&7>zURv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w7TJv4_ {
$B (kZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
33Az$GXFsq bProcessed=TRUE;
2C=Q8ayvX }
@'6"7g }
/=: j9FF }
C! 9} else if((lParam&0xc000ffff)==1){ //有键按下
ztll} switch(wParam)
5B4Ssrs5W~ {
p3(2?UO! case VK_MENU:
*ZrSiIPP MaskBits|=ALTBIT;
!t#F/C break;
xHA0gZf case VK_CONTROL:
Fc 6iQ MaskBits|=CTRLBIT;
'b&yrBFD break;
zM#sOg case VK_SHIFT:
8LzBh_J? MaskBits|=SHIFTBIT;
u<xo/=Z break;
=r2]uW9 default: //judge the key and send message
I/6)3su% break;
N2C7[z+l` }
hz:pbes for(int index=0;index<MAX_KEY;index++){
xc@Ss[ if(hCallWnd[index]==NULL)
#5} wuj%5 continue;
YJV% a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.a'f|c6 {
~f\G68c SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
a_~=#]a bProcessed=TRUE;
k[j90C5 }
U8$4
R,+ }
Mkxi~p%<r }
p'_%aVm7 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+]Zva:$#` for(int index=0;index<MAX_KEY;index++){
<ABX0U[* if(hCallWnd[index]==NULL)
sgUud_r)4 continue;
R%Y`=pK>} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
GLMm( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.B2]xfo"` //lParam的意义可看MSDN中WM_KEYDOWN部分
3?I;ovsM }
Pe73g% }
>$WQxbwM( }
NoE*/!Sr return CallNextHookEx( hHook, nCode, wParam, lParam );
ia @'%8 }
(t+;O; ZBT1Y.qA 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
46@{5)Tq : 18KR*;p BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!9Z r;K~\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
DyJ.BQdk) AlE8Xu9UB 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
\_V-A f{6 /P|fB]p LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Fb`a~c~s {
<7SpEVQ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
t_^X$pL {
Fb22p6r //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Hmt^h(*/2 SaveBmp();
[epi#]m return FALSE;
*a;@* }
%
2$/JZ …… //其它处理及默认处理
>{gPN"S"a }
S8[=S EP'h@zdz @hQlrq5c 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
L!0OC''C ULrr=5&8 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
!* Ti}oIo& g9D^) V 二、编程步骤
'. Ed`?<p !U9|x\BqJ2 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
h,aA w#NE* ryF7 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
f"7O "6 3~ S'LxV 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
IN8>ZV`j) 00v&lQBW 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
]^':Bmq |F,R&<2 5、 添加代码,编译运行程序。
dI&!e#Y j`^$# 三、程序代码
IG)s^bP ;c~cet4 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
S#)Eom?V #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
/Jf.y*; #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
L^2FQti> #if _MSC_VER > 1000
dm0QcW4 #pragma once
D]w!2k%V #endif // _MSC_VER > 1000
fkf1m:Ckh #ifndef __AFXWIN_H__
]#7zk9 #error include 'stdafx.h' before including this file for PCH
}bY;q- #endif
Tc8un. #include "resource.h" // main symbols
N\:.
M class CHookApp : public CWinApp
O5$/55PI {
&j(+ /;A public:
Ee4&g<X. CHookApp();
?]D"k4 // Overrides
W;bu2ym&Q // ClassWizard generated virtual function overrides
3)-/`iy# //{{AFX_VIRTUAL(CHookApp)
.ObZ\.I public:
u6>?AW1~ virtual BOOL InitInstance();
G!K]W:m virtual int ExitInstance();
hX`}Q4(k //}}AFX_VIRTUAL
C<KrMRWh^ //{{AFX_MSG(CHookApp)
(Yp+bS(PU* // NOTE - the ClassWizard will add and remove member functions here.
%K(<$! // DO NOT EDIT what you see in these blocks of generated code !
pw7[y^[Qg //}}AFX_MSG
@u==x*{| DECLARE_MESSAGE_MAP()
-@T/b$]'n };
zSo)k~&[3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Q+4Xs.# BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
T,|
1g6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
X[f=h=| BOOL InitHotkey();
\j&^aAp r BOOL UnInit();
UnI48Y #endif
7AYd!n&S 0-~\
W( //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
X]\ \, #include "stdafx.h"
:_!8
WB #include "hook.h"
N<QXmgqx #include <windowsx.h>
c478P=g=5 #ifdef _DEBUG
Yjx|9_|Xn #define new DEBUG_NEW
v) vkn/: #undef THIS_FILE
h/~n\0,J/ static char THIS_FILE[] = __FILE__;
?LvCR_D: #endif
3p0LN'q]A #define MAX_KEY 100
E<yW\ #define CTRLBIT 0x04
p.LFVFPT #define ALTBIT 0x02
cA%%IL$R #define SHIFTBIT 0x01
]`Oo%$Ue #pragma data_seg("shareddata")
M5xCC! HHOOK hHook =NULL;
2W4qBaG$= UINT nHookCount =0;
@)Ofi j static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
jBegh9KHq static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
fk_o@
G!0 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
sQMFpIrr static int KeyCount =0;
DGzw8|/( static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
m!<\WN6g #pragma data_seg()
[B+W%g(c- HINSTANCE hins;
]Kr
`9r), void VerifyWindow();
4~B>
9<$e> BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
NH+(?TN //{{AFX_MSG_MAP(CHookApp)
qWmQ-|Py // NOTE - the ClassWizard will add and remove mapping macros here.
YW{C} NA // DO NOT EDIT what you see in these blocks of generated code!
dd]/.Z //}}AFX_MSG_MAP
)B[0JrcE END_MESSAGE_MAP()
"HPB!)C8( s`0QA!G{- CHookApp::CHookApp()
rF]h$Z8o {
qh`t- // TODO: add construction code here,
J>/w5$h5 // Place all significant initialization in InitInstance
{GC?SaK }
F7Zwh5W ,_Z+8 CHookApp theApp;
j?MAED LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
By% =W5 {
;<leKcvhQ& BOOL bProcessed=FALSE;
Q=]w !I\ if(HC_ACTION==nCode)
0}b
tXh {
^<e.]F25M if((lParam&0xc0000000)==0xc0000000){// Key up
\EVBwE, switch(wParam)
U\Z?taXB {
mvq&Pj 1}L case VK_MENU:
=5\|[NSK- MaskBits&=~ALTBIT;
je!-J8{ break;
b,CaWg case VK_CONTROL:
WL'P)lI5 MaskBits&=~CTRLBIT;
]MxC_V+P` break;
#5f-`~^C{ case VK_SHIFT:
M@5?ZZ4L MaskBits&=~SHIFTBIT;
-{ H0g] break;
;UxP
Kpl default: //judge the key and send message
KN* break;
eM+!Y>8Y }
dH-s2r%s for(int index=0;index<MAX_KEY;index++){
|o\8 if(hCallWnd[index]==NULL)
y~FV2$ continue;
h=:Q-?n- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
VY3& {
wu)w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
m}X`> aD/ bProcessed=TRUE;
1;{Rhu7*
k }
2RX!V@z.G }
sQ
fFu }
L31HGH2l else if((lParam&0xc000ffff)==1){ //Key down
zRyuq1Zyc, switch(wParam)
vMS
|$L {
0PWg;>^' case VK_MENU:
3? HhG MaskBits|=ALTBIT;
UXdUO@ break;
h@[R6G| case VK_CONTROL:
kO}AxeQ MaskBits|=CTRLBIT;
.,OVzW break;
?O8ViB?2 case VK_SHIFT:
9M:O0) s MaskBits|=SHIFTBIT;
h-%R<[ break;
CO`_^7o9( default: //judge the key and send message
t]YC"%[S break;
sJDas,7> }
#Y4=J
6 for(int index=0;index<MAX_KEY;index++)
o|$AyS{1 {
:$n=$C-wp if(hCallWnd[index]==NULL)
kOed ]>H continue;
(JM5`XwM
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9o+)?1\ {
!7kG!)40 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
O)jWZOVp > bProcessed=TRUE;
,]d,-)KX8 }
gntxNp[9T }
3de_V|% }
/bi}'H+# if(!bProcessed){
2Tagr1L for(int index=0;index<MAX_KEY;index++){
i(NdGL#P if(hCallWnd[index]==NULL)
sashzVwJ-= continue;
D8xmE2% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
hK_LEwd; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
<?@NRFTe }
rsy'q(N[ }
F 9@h|#an }
~FN9 [aJF+ return CallNextHookEx( hHook, nCode, wParam, lParam );
,.7*Hpa }
lb3]$Da
LS917ci- BOOL InitHotkey()
[Ki0b^ {
-&-Ma,M? if(hHook!=NULL){
apu4DAy&8 nHookCount++;
/%;mqrdk return TRUE;
hX=A)73( }
z&fwE$Nm else
fP(d8xTx2y hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
m+Rv+_R if(hHook!=NULL)
W;,C_ nHookCount++;
6Q${U7%7 return (hHook!=NULL);
y$_eCmq }
`nZ )> BOOL UnInit()
RE/~#k@a {
1fZ(l" if(nHookCount>1){
e=+?K5q{P( nHookCount--;
SgS~ {4Zx* return TRUE;
28UU60 }
H kQ)n3 BOOL unhooked = UnhookWindowsHookEx(hHook);
/so8WRu. if(unhooked==TRUE){
(G[
*|6m nHookCount=0;
)3>hhuaa hHook=NULL;
{qN 5MsY }
c1E'$-
K@ return unhooked;
Ro9tZ'N!S
}
H{=21\a\ uLWh| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E( Z8 {
t({W
[JL BOOL bAdded=FALSE;
&FF"nE* for(int index=0;index<MAX_KEY;index++){
[rSR:V?"a if(hCallWnd[index]==0){
[D<1CF hCallWnd[index]=hWnd;
C,NJb+J HotKey[index]=cKey;
BS:+~| 3w HotKeyMask[index]=cMask;
7eV
di* bAdded=TRUE;
;e1ku|>$ KeyCount++;
U
15H2-` break;
<|SRe6m }
;{U@qQD7 }
]3X@_NYj return bAdded;
y9>ZwYN }
~2gG(1%At9 s=0BMPDgm BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~Hr}] {
j'MO(ev BOOL bRemoved=FALSE;
&3n~%$#N for(int index=0;index<MAX_KEY;index++){
!X;1 } if(hCallWnd[index]==hWnd){
LdL/399< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
|bO"_U hCallWnd[index]=NULL;
f)^_|8 HotKey[index]=0;
=*r])Vg^ HotKeyMask[index]=0;
% a@>_ bRemoved=TRUE;
3_MS.iM KeyCount--;
'qOREN break;
d~1gMz+) }
mqSQL}vR }
^h"`}[+ }
7~5ym15* return bRemoved;
?B}{GL2) }
$h*L=t( /#m=*&!CB void VerifyWindow()
&L,nqc\3D5 {
f7X6fr< for(int i=0;i<MAX_KEY;i++){
K otrX if(hCallWnd
!=NULL){ ,#L=v]
if(!IsWindow(hCallWnd)){ 6er-{.L=
hCallWnd=NULL; &C"L
HotKey=0; J
/f
HotKeyMask=0; JNJ=e,O,
KeyCount--; y"H*%]
} /Z@tv.f
} t3&LO~Ye
} *fn*h[pV&
} Ljx(\Cm
d ysC4DS
BOOL CHookApp::InitInstance() 'U\<IL#U
{ 8q,6}mV
AFX_MANAGE_STATE(AfxGetStaticModuleState()); U8LtG/
hins=AfxGetInstanceHandle(); VrxQc qPr`
InitHotkey(); <7j87
return CWinApp::InitInstance(); BA%pY|"Q
} 5sx1Zq7
vM*($qpAy
int CHookApp::ExitInstance() q@nP}Pv&5
{ ~e+\k>^eN
VerifyWindow(); ?MgUY)X
UnInit(); M>i9 i-dU
return CWinApp::ExitInstance(); >76\nGO
} VBcy9|lD
:"xzj<(
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file + EGD.S{
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) C
ihAU"
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /p+>NZ"b
#if _MSC_VER > 1000 ~1W x=
#pragma once }}>q2y
#endif // _MSC_VER > 1000 T^~5n6
JAQb{KefdO
class CCaptureDlg : public CDialog "6us#T
{ FMClSeO7
// Construction 5
({t4dm
public: 06N}k<10O
BOOL bTray; YYu6W@m]
BOOL bRegistered; /$'AjIg4:&
BOOL RegisterHotkey(); JQ6zVS2SSS
UCHAR cKey; }DK7'K
UCHAR cMask; 7,lq}a8z
void DeleteIcon(); 6u7?dG'4
void AddIcon(); zY('t!u8
UINT nCount;
WqXbI4;pJ
void SaveBmp(); H=Y{rq @
CCaptureDlg(CWnd* pParent = NULL); // standard constructor :=\Hoz
// Dialog Data E~gyy]8&
//{{AFX_DATA(CCaptureDlg) f,:9N 5Z
enum { IDD = IDD_CAPTURE_DIALOG }; VI'hb'2
CComboBox m_Key; &'}/f5s|
BOOL m_bControl; >V*mr{/1
BOOL m_bAlt; l33Pm/V2?
BOOL m_bShift; Gr^E+#;
CString m_Path; hnc@
CString m_Number; -2 A(5B9Fq
//}}AFX_DATA _;UE9S%
// ClassWizard generated virtual function overrides \3S8 62B7
//{{AFX_VIRTUAL(CCaptureDlg) lS'-xEv?
public: ` M3w]qJ<}
virtual BOOL PreTranslateMessage(MSG* pMsg); NH<5*I/
protected: _q{c##Kf
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LkK~%tY
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Gq }U|Z
//}}AFX_VIRTUAL =aoMii
// Implementation viMzR(JU
protected: HFaj-~b
HICON m_hIcon; "huFA|`
// Generated message map functions K3x.RQQ-
//{{AFX_MSG(CCaptureDlg) 5&q8g;XiEM
virtual BOOL OnInitDialog(); B3
5E8/
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); m/y2WlcRx
afx_msg void OnPaint(); li 6%)
afx_msg HCURSOR OnQueryDragIcon(); @qnD=mE
virtual void OnCancel(); 6w(6}m.L^
afx_msg void OnAbout(); U}PiY"S<
afx_msg void OnBrowse(); _G.>+!"2/
afx_msg void OnChange(); !qN||mCH
//}}AFX_MSG "G@g" gP
DECLARE_MESSAGE_MAP() mM-8+H?~b
}; ktdW`R\+
#endif $+3}po\
X7i/fm{l'
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kT!9`S\
#include "stdafx.h" pFHz"]
#include "Capture.h" 9uBM<
#include "CaptureDlg.h" ~(IB0=A{v
#include <windowsx.h> i2&ed_h<?
#pragma comment(lib,"hook.lib") _cJ2\`M
#ifdef _DEBUG -cSP_1
#define new DEBUG_NEW (;57 Vw
#undef THIS_FILE hijgF@
static char THIS_FILE[] = __FILE__;
GrAujc5|
#endif pn.T~"%
#define IDM_SHELL WM_USER+1 `/ q|@B7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A0q|J/T
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `P3>S(Tgy
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Qe5U<3{JZ
class CAboutDlg : public CDialog j"|=C$Kn/
{ 'Ub
g0"F(
public: HsHB!mQV
CAboutDlg(); j.L-{6_s>~
// Dialog Data Ffv`kn@
//{{AFX_DATA(CAboutDlg) u(wGl_
enum { IDD = IDD_ABOUTBOX }; }c}|
$h^Y
//}}AFX_DATA [h34d5'w
// ClassWizard generated virtual function overrides eL\;Nf+Zp
//{{AFX_VIRTUAL(CAboutDlg) >ey\jDr#O
protected: d)R:9M}v
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WeQk<y
//}}AFX_VIRTUAL ( 2n>A D_
// Implementation 75T7+:p
protected: B,@c;K
//{{AFX_MSG(CAboutDlg) ]):<ZsT
//}}AFX_MSG 5i1>I=N
DECLARE_MESSAGE_MAP() mqAWL:VvQ7
}; bV$)!]V
G1"zElug
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0DmMG
{ (h5'9r
//{{AFX_DATA_INIT(CAboutDlg) G_k~X"
//}}AFX_DATA_INIT W81E!RyP`
} =|%Cu&
]&i.b+^
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2GWMlI
{ 'iGzkf}j
CDialog::DoDataExchange(pDX); $;/}?QY(
//{{AFX_DATA_MAP(CAboutDlg) MV\|e1B}
//}}AFX_DATA_MAP W'.s\e?gh
} >b6-OFJx
k?z98 >4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) a(9L,v#?
//{{AFX_MSG_MAP(CAboutDlg) A%D7bQ
// No message handlers b r^_'1
//}}AFX_MSG_MAP rZfN+S,g
END_MESSAGE_MAP()
mi)LP?q
_-9@qe
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?}RSwl
: CDialog(CCaptureDlg::IDD, pParent) 6C]1Q.f;
{ u9}1)9
//{{AFX_DATA_INIT(CCaptureDlg) B]Y}Hu
m_bControl = FALSE; j^;I3_P
m_bAlt = FALSE; jGEt+\"/QJ
m_bShift = FALSE; D!.+Y-+Xzu
m_Path = _T("c:\\"); -t2+|J*
m_Number = _T("0 picture captured."); HKqwE=NZ
nCount=0; @Q^P{
bRegistered=FALSE; \z$p%4`E@
bTray=FALSE; &Ibu>di4[
//}}AFX_DATA_INIT (A?H1 9
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |kvC
H<F'
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1e>s{
} =7C%P%yt
8}FzZ?DRy
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Bnb#{tL
{ HVP"A3}KC
CDialog::DoDataExchange(pDX); BvR-K\rx
//{{AFX_DATA_MAP(CCaptureDlg) 91q8k=p
DDX_Control(pDX, IDC_KEY, m_Key); /qx0TDB
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8 XICF
DDX_Check(pDX, IDC_ALT, m_bAlt); $`wMX{
DDX_Check(pDX, IDC_SHIFT, m_bShift); VsN pHQG]
DDX_Text(pDX, IDC_PATH, m_Path); awOd_![c'
DDX_Text(pDX, IDC_NUMBER, m_Number); mFSw@CC
//}}AFX_DATA_MAP 0\:(ageY?
} H'LD}\K l
j8fpj {hp
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0MkSf*
//{{AFX_MSG_MAP(CCaptureDlg) =Uj-^qcE
ON_WM_SYSCOMMAND() Q<KvBgmT
ON_WM_PAINT() z j/!In
ON_WM_QUERYDRAGICON() ~5 *5
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3q'&j,,^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) rc/nFl6#
ON_BN_CLICKED(ID_CHANGE, OnChange) 8:#rA*Y
//}}AFX_MSG_MAP Ci<ATho
END_MESSAGE_MAP() }yJ$SR]t
-,+q#F
BOOL CCaptureDlg::OnInitDialog() CWNx4)ZGw
{ qWx][D"
CDialog::OnInitDialog(); &3$z4df
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =Apxdnz,
ASSERT(IDM_ABOUTBOX < 0xF000); 66'?&Xx'
CMenu* pSysMenu = GetSystemMenu(FALSE); :J:,m
if (pSysMenu != NULL) ~,BIf+\XF
{ RtCkV xaEx
CString strAboutMenu; 5e}A@GyC
strAboutMenu.LoadString(IDS_ABOUTBOX); K,e w >U
if (!strAboutMenu.IsEmpty()) x#Q>J"g
{ )DeA}e?F
pSysMenu->AppendMenu(MF_SEPARATOR); >A<bBK#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v k?skN@
} <7n4_RlF!
} qpsvi.S
SetIcon(m_hIcon, TRUE); // Set big icon a?6ab+7#
SetIcon(m_hIcon, FALSE); // Set small icon qKE:3g35
m_Key.SetCurSel(0); 9!Ar`Io2@
RegisterHotkey(); \MmI`$
CMenu* pMenu=GetSystemMenu(FALSE); w1Ec_y {
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Q\WC+,_%
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); DF
g,Xa#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); h^*4}GU
return TRUE; // return TRUE unless you set the focus to a control 2l
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} hTM[8 ~<^
~O]]N;>72"
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !Mu|mz=
{ \|U l]1pO8
if ((nID & 0xFFF0) == IDM_ABOUTBOX) PmR~c,
{ 0k'e:AjP
CAboutDlg dlgAbout; Ezi-VGjr]
dlgAbout.DoModal(); ynB _"mg
} ^m/oDB-
else >(<ytn t=
{ Hsihytdj
CDialog::OnSysCommand(nID, lParam); !j\" w p
} :gB[O>'<m
} C:uz6i1
J8"[6vI d~
void CCaptureDlg::OnPaint() LS5vW|]w
{ Qq@G\eRo
if (IsIconic()) `AkIK*
{ (^5 7UmFv]
CPaintDC dc(this); // device context for painting =1u@7Bh
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); sz9G3artK&
// Center icon in client rectangle <97d[/7i
int cxIcon = GetSystemMetrics(SM_CXICON); :KKa4=5L
int cyIcon = GetSystemMetrics(SM_CYICON); 3 AHY|
CRect rect; #CnHf
GetClientRect(&rect); nD0}wiL{
int x = (rect.Width() - cxIcon + 1) / 2; I0'[!kBF|
int y = (rect.Height() - cyIcon + 1) / 2; T /mI[*1xI
// Draw the icon \(Pohw WWo
dc.DrawIcon(x, y, m_hIcon); _kdL'x
} ! {82D[5
else +dPL>R
{ >^OC{~Az
CDialog::OnPaint(); 3GmeD/6
} %',F
} qA:#iJ8w
O0:)X)b
HCURSOR CCaptureDlg::OnQueryDragIcon() ~-#yOu
,w
{ /Ux*u#
return (HCURSOR) m_hIcon; 0}:2Q#
}
c\q
r,]#b[:.s|
void CCaptureDlg::OnCancel() QeDQo
{ e }*0ghKI
if(bTray) ~=wCwA|1
DeleteIcon(); Dgql?+2$
CDialog::OnCancel(); 9M /SH$Qy
} `s]4AKBO
=rd|0K"(r
void CCaptureDlg::OnAbout() 4#(ZNP
{ 1TM~*<Jb
CAboutDlg dlg; teW6;O_
dlg.DoModal(); X>I)~z}9#
} S/`%Q2za4
$x#FgD(iI
void CCaptureDlg::OnBrowse() D&ve15wL
{ #"ftI7=42
CString str; MzYavg`
BROWSEINFO bi; |T4kqW{
char name[MAX_PATH]; "0EA;S8$8
ZeroMemory(&bi,sizeof(BROWSEINFO)); d$Y7u
bi.hwndOwner=GetSafeHwnd(); tURc bwV
bi.pszDisplayName=name; Fa epDjY8
bi.lpszTitle="Select folder"; m3^/:<
bi.ulFlags=BIF_RETURNONLYFSDIRS; m))<!3
LPITEMIDLIST idl=SHBrowseForFolder(&bi); c DrebU
if(idl==NULL) g2R@`./S
return; 6QNs\Ucb+
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !'f3>W\
str.ReleaseBuffer(); /:\3 \{?0m
m_Path=str; P(SZ68
if(str.GetAt(str.GetLength()-1)!='\\') "{E qhR~
m_Path+="\\"; 7$k8%lI;>
UpdateData(FALSE); Pz_NDI
} tQ~W EC
\]Dt4o*yZ
void CCaptureDlg::SaveBmp()
I<=Df5M
{ &48_2Q"{
CDC dc; i1oKrRv
dc.CreateDC("DISPLAY",NULL,NULL,NULL); M0c9pE
CBitmap bm; o+?rI
p
int Width=GetSystemMetrics(SM_CXSCREEN); f&hwi:t
int Height=GetSystemMetrics(SM_CYSCREEN); C*I(|.i@
bm.CreateCompatibleBitmap(&dc,Width,Height); #Y93y\
CDC tdc; w#
*1 /N
tdc.CreateCompatibleDC(&dc); %@R~DBS
CBitmap*pOld=tdc.SelectObject(&bm); XMRNuEU
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z?^"\u-
tdc.SelectObject(pOld); @ 2_<,;$
BITMAP btm; aj~bt-cE
bm.GetBitmap(&btm); ]bgY6@M
DWORD size=btm.bmWidthBytes*btm.bmHeight; #*c F8NV-
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'ZQWYr9R
BITMAPINFOHEADER bih; 33~qgK1>
bih.biBitCount=btm.bmBitsPixel; "Jy~PcJZ1
bih.biClrImportant=0; n(lk
dw
bih.biClrUsed=0; lM#A3/=K
bih.biCompression=0; O}#yijU3e
bih.biHeight=btm.bmHeight; O {k:yVb
bih.biPlanes=1; ]Y.deVw3i
bih.biSize=sizeof(BITMAPINFOHEADER); fA! 6sB
bih.biSizeImage=size; q6wr=OWD
bih.biWidth=btm.bmWidth; 15zrrU~D
bih.biXPelsPerMeter=0; y_}SK6{
bih.biYPelsPerMeter=0; o0pT6N)
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); WA)Ij(M8 p
static int filecount=0; ecX/K.8l
CString name; !]S=z^"<
name.Format("pict%04d.bmp",filecount++); -qe bQv
name=m_Path+name; *mBJ?{ !
BITMAPFILEHEADER bfh; x7RdZC
bfh.bfReserved1=bfh.bfReserved2=0; hxC!+ArVe
bfh.bfType=((WORD)('M'<< 8)|'B'); 137Xl>nO
bfh.bfSize=54+size; (\dK4JJ
bfh.bfOffBits=54; 2D([Z -<i
CFile bf; BN@,/m9OQ%
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mEQ!-p
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?A7Yk4Y.?N
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c[0oh.
bf.WriteHuge(lpData,size); -)<mS
bf.Close(); 2 Y|D'^
nCount++; ,vG<*|pn
} _1jw=5^P\i
GlobalFreePtr(lpData); nDlO5 pe"d
if(nCount==1) IbWPlbH
m_Number.Format("%d picture captured.",nCount); 3SARr>HRyI
else C%ytkzG_
m_Number.Format("%d pictures captured.",nCount); 5@XV6
UpdateData(FALSE); qSQ@p\O~
} vZajT!h
9b6!CNe!
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =Mhg
{ PaVO"y]C
if(pMsg -> message == WM_KEYDOWN) y,<$X.>QO|
{ yty`2$O
if(pMsg -> wParam == VK_ESCAPE) =J@`0H"
return TRUE; 4R +P
if(pMsg -> wParam == VK_RETURN) @+^c"=d1S
return TRUE; Lm.`+W5
} x.EgTvA&d
return CDialog::PreTranslateMessage(pMsg); h)E|?b_
} eO{@@?/y
u fw cF*
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) W3LP
~
{ D{AFL.r{
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4YJ=q% G
SaveBmp(); jNy?[
)
return FALSE; ma9ADFFT
} Q[s2}Z!N;
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +$(0w35V5
CMenu pop; |5xz l
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )o8g=7Jm
CMenu*pMenu=pop.GetSubMenu(0); ">6&+^BN'
pMenu->SetDefaultItem(ID_EXITICON); PZ34 *q
CPoint pt; 7Qh_8M
GetCursorPos(&pt); K&UE0JO'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B
<+K<,S
if(id==ID_EXITICON) k!doIMj
DeleteIcon(); j??tmo
else if(id==ID_EXIT) cw+g
z!!
OnCancel(); w &vhWq
return FALSE;
A1Q
+0
} n(jjvLf
LRESULT res= CDialog::WindowProc(message, wParam, lParam); TmiWjQv`
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8X~h?^Vz
AddIcon(); /Dw@d,&[
return res; `{G?>z Fp
} 8D2yR#3
wZv-b*4
void CCaptureDlg::AddIcon() n+quSF)
{ pGGV\zD^
NOTIFYICONDATA data; O3ZM:,.
data.cbSize=sizeof(NOTIFYICONDATA); CT}' ")Bm
CString tip; u)7
]1e{
tip.LoadString(IDS_ICONTIP); baIbf@t/
data.hIcon=GetIcon(0); l7Lj[d<n
data.hWnd=GetSafeHwnd(); >h[(w
strcpy(data.szTip,tip); g9qC{xd
data.uCallbackMessage=IDM_SHELL; _j 5N=I{U
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >tEK+Y|N}
data.uID=98; G{A)H_o*
Shell_NotifyIcon(NIM_ADD,&data); gUGOHd(A
ShowWindow(SW_HIDE); S'?fJ.
bTray=TRUE; WW3
B
} cqk]NL`'
ja75c~RUw
void CCaptureDlg::DeleteIcon() 8&T,LNZoY
{ kr{)
NOTIFYICONDATA data; M;qb7Mu
data.cbSize=sizeof(NOTIFYICONDATA); x(vai1CrdH
data.hWnd=GetSafeHwnd(); F;a3
data.uID=98; l7Y8b`
Shell_NotifyIcon(NIM_DELETE,&data); i>"dBJh]b
ShowWindow(SW_SHOW); v?%3~XoH
SetForegroundWindow(); .M+v?Ad
ShowWindow(SW_SHOWNORMAL); &Y=.D:z<
bTray=FALSE; c
`ud;lI
} ?{j@6,
N<"`ShCNM
void CCaptureDlg::OnChange() %|jzEBz@
{ (+x]##Q
RegisterHotkey(); k<, u0
} jnDQ{D
3q CHh
BOOL CCaptureDlg::RegisterHotkey() wDZ
{ ~B*~'I9b*
UpdateData(); *N'hA5.z
UCHAR mask=0; RnSm]}?
UCHAR key=0; {Ve
D@
if(m_bControl) Q,n4i@E
mask|=4; 4
iKR{P6
if(m_bAlt) @% H8"A
mask|=2; 5&G
5eA
if(m_bShift) TC@bL<1
mask|=1; YJc%h@ _=]
key=Key_Table[m_Key.GetCurSel()]; NZ)b:~a
if(bRegistered){ &PSTwZd
DeleteHotkey(GetSafeHwnd(),cKey,cMask); yP%o0n/"x
bRegistered=FALSE; 55,=[
} 2x6<8J8v*
cMask=mask; )"F5lOA6
cKey=key; K{N%kk%F
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pEkOSG
return bRegistered; E+Im~=m$
} _lNC<7+#h
iz$FcA]
四、小结 +
lP5XY{
*0-v!\{
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。