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:
K\G|q}E/1
Mtu8zm 一、实现方法
x)*[>d2yd rlD@O~P4 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:
Ch3##- ;I>`!|mT #pragma data_seg("shareddata")
+xMDm_TGLA HHOOK hHook =NULL; //钩子句柄
RaAq>B
WPr UINT nHookCount =0; //挂接的程序数目
4"{q|~&=:$ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
JmkJ^-A 6 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
d=[. static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
gIeo7>u static int KeyCount =0;
[eImP
V] static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
2bqwnRT} #pragma data_seg()
VrpYBU N}\i!YUD 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。
?G@%haqn6 ,M9'S;&^ 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:
I/'>Bn+ ][3 "xP BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ctf'/IZ5 cKey,UCHAR cMask)
-
0zo>[c/p {
SLW1]ZaG BOOL bAdded=FALSE;
F)C8LH for(int index=0;index<MAX_KEY;index++){
!*p lK6a if(hCallWnd[index]==0){
:H~r
_>E hCallWnd[index]=hWnd;
!)GPI?{^5 HotKey[index]=cKey;
\>+gZc]an HotKeyMask[index]=cMask;
=Oy,SX bAdded=TRUE;
.*ZNZ|g_ KeyCount++;
B$)KZR(u break;
`+U-oqs }
Ab2VF;z : }
_ v-sb(*
J return bAdded;
jsuQR }
`|gCbs95 //删除热键
GFvOrRlP\ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BP` UB {
BzDS BOOL bRemoved=FALSE;
T6tJwSS4: for(int index=0;index<MAX_KEY;index++){
k
v b"n} if(hCallWnd[index]==hWnd){
akR*|iK#b if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
'SC`->F4D hCallWnd[index]=NULL;
#]9yzyb_y HotKey[index]=0;
cng1k
HotKeyMask[index]=0;
ST{<G bRemoved=TRUE;
t JJaIb6Xj KeyCount--;
5z0SjQ break;
by-B).7 }
b( wiJ&t }
'i}Q R~pe }
'E9\V\bi return bRemoved;
Q WOd&=: }
G*ecM`Bl =T[kGg8` &TKB8vx=# DLL中的钩子函数如下:
%#=
1?1s \2uQ"kJC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
905
/4z' {
;#AV~Y-
s BOOL bProcessed=FALSE;
j &~OR6 if(HC_ACTION==nCode)
(i { {
xR$xAcoSB if((lParam&0xc0000000)==0xc0000000){// 有键松开
ZZ.GpB. switch(wParam)
%0L9)-R {
< d?O#( case VK_MENU:
UtzW 5{ MaskBits&=~ALTBIT;
nM@S`" break;
v=!]t=P)t case VK_CONTROL:
`Dj-(~x MaskBits&=~CTRLBIT;
$cc]pJy"} break;
QHK$2xtq| case VK_SHIFT:
y:xZ(RgfF MaskBits&=~SHIFTBIT;
B&cC;Hw break;
r.[9/'> default: //judge the key and send message
O>UR\l|+:2 break;
J@52<.>6 }
-FwOX~s/' for(int index=0;index<MAX_KEY;index++){
t|1?mH9 if(hCallWnd[index]==NULL)
W@#Y/L:${ continue;
%;GDg3L[p if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_Y=>^K]9K {
?,]25q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
oTZNW bProcessed=TRUE;
~i(X{^,3 }
~qs97' }
4\>Cnc{ }
O",:0< else if((lParam&0xc000ffff)==1){ //有键按下
3#W> switch(wParam)
2-FL&DE {
;:f.a(~c case VK_MENU:
;8H
m#p7, MaskBits|=ALTBIT;
7&E3d P break;
%6L{Z *( case VK_CONTROL:
,'[0tl}8K MaskBits|=CTRLBIT;
>A#]60w. break;
@jX[Ho0W' case VK_SHIFT:
.#@*)1A#t MaskBits|=SHIFTBIT;
S-GcH break;
&;|/I`+ default: //judge the key and send message
Fc{hzqaP8 break;
6Wl+5
a6V }
PE0A ` for(int index=0;index<MAX_KEY;index++){
,@Xl? if(hCallWnd[index]==NULL)
)bXiw3'A continue;
fQM:NI?9? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,..&j+m {
a?_N8|k[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6|L<?
X bProcessed=TRUE;
>2TDYB|; }
^ 14U]< }
o/
ozX4C }
,!Gw40t if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
abp]qvCV for(int index=0;index<MAX_KEY;index++){
CtfI&rb[ if(hCallWnd[index]==NULL)
#3leMZ6 continue;
Z+x,Awq if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
o[X'We; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
2eK!<Gj //lParam的意义可看MSDN中WM_KEYDOWN部分
z1K@AaRx }
f%;8]a9 }
unKi)v1 }
(]>=y return CallNextHookEx( hHook, nCode, wParam, lParam );
CNwIM6t }
4cDjf~n qS:hv&~ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
-W<x|ph
U Y xp.` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
QX-%<@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?#da4W {1Z8cV 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:
Dyyf%'\M Wxx?iW , LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{26/SY {
j#hFx+S if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
gMS-mkZ {
3 -Nwg9U //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
B&3oo SaveBmp();
Iy% fg',% return FALSE;
L)p*D( }
kZ~ 0fw- …… //其它处理及默认处理
<b!nI
N }
qbrY5;U 5)bf$?d ZCVwQ#Xe+ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
)RG@D\t , 0]p!
Bscaf 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
46OYOa
+uZ,}J 二、编程步骤
]?tC+UKb e=e^;K4 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
O/
Yz6VQ ^E{M[;sF3y 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
bk^W]<:z` LX;w~fRr. 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
5n{J}0C 3D|Y4OM 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
BWRAz*V :Yeo*v9 5、 添加代码,编译运行程序。
RvrZtg5 HtY0=r 三、程序代码
_kGJqyYV }ya@*jH ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
5G
@ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
s F-{( #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
F<H[-k*t/ #if _MSC_VER > 1000
Av6=q=D #pragma once
HmlE Cx #endif // _MSC_VER > 1000
=A[:]),v #ifndef __AFXWIN_H__
VAPRI\uM; #error include 'stdafx.h' before including this file for PCH
`Tw DR6& #endif
YD>5zV%!D #include "resource.h" // main symbols
3h N?l
:/b class CHookApp : public CWinApp
Zcst$Aro {
=ie8{j2: public:
Lxz!>JO> CHookApp();
qTxw5.Ai! // Overrides
cC@.& // ClassWizard generated virtual function overrides
D#"BY;
J //{{AFX_VIRTUAL(CHookApp)
YNHQbsZUI, public:
dZ^(e0& :H virtual BOOL InitInstance();
_7e ^
t N virtual int ExitInstance();
ye?4^@u u //}}AFX_VIRTUAL
S\wh
*'Y //{{AFX_MSG(CHookApp)
ygI81\D // NOTE - the ClassWizard will add and remove member functions here.
rF n%e // DO NOT EDIT what you see in these blocks of generated code !
Z8mSm[w //}}AFX_MSG
DNTkv_S DECLARE_MESSAGE_MAP()
y-C=_v_X };
$U. >]i LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
9rD6."G BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3X|7 R BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
j:k}6]p} BOOL InitHotkey();
5~8FZ-x BOOL UnInit();
e
*9c33 #endif
`eZ
+Pf". {9mXJu$cc //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
MC\rx=cR\ #include "stdafx.h"
m 0jm$>:Z #include "hook.h"
''.P= #include <windowsx.h>
Q#gzk%jL@ #ifdef _DEBUG
'2LK(uaU #define new DEBUG_NEW
0 $Ygt0d #undef THIS_FILE
"p Rr>F a static char THIS_FILE[] = __FILE__;
`3wzOMgJ #endif
t?&@bs5~g #define MAX_KEY 100
Xgb ~ED] #define CTRLBIT 0x04
d;:H#F+ ( #define ALTBIT 0x02
7tZvz `\ #define SHIFTBIT 0x01
1VXyn\ #pragma data_seg("shareddata")
+,8j]<wpo HHOOK hHook =NULL;
b\
P6,s'( UINT nHookCount =0;
FR57F(31 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@$:T]N3m static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Nj5V" c static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
X6h@K</c^: static int KeyCount =0;
s*XE static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
UYw_k\ #pragma data_seg()
*HC[LM HINSTANCE hins;
3P}^Wu void VerifyWindow();
N*mm[F2+F BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
O4c[,Uq8~ //{{AFX_MSG_MAP(CHookApp)
fC4#b?Q // NOTE - the ClassWizard will add and remove mapping macros here.
.@5RoD[o // DO NOT EDIT what you see in these blocks of generated code!
\+9~\eeXb //}}AFX_MSG_MAP
Ire+r
"am END_MESSAGE_MAP()
xbTvv>'U B me_# CHookApp::CHookApp()
?v5OUmFM {
OCX>LK!K // TODO: add construction code here,
J`I^F:y* // Place all significant initialization in InitInstance
!PySYY }
LvM;ZfAEv ;~^9$Z@%Q CHookApp theApp;
BI|BfO%F$j LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
1K&_t {
N'5AU ( BOOL bProcessed=FALSE;
@gc|Z]CV if(HC_ACTION==nCode)
Gd%X> ~ {
B)L=)N if((lParam&0xc0000000)==0xc0000000){// Key up
{?+dVLa^; switch(wParam)
E\_Wpk {
Q:v9C ^7 case VK_MENU:
NT1"?Thx| MaskBits&=~ALTBIT;
isF
jJPe break;
g %ZKn case VK_CONTROL:
2SABu796j MaskBits&=~CTRLBIT;
s:p6oEQ=J break;
kO)+%'L!8 case VK_SHIFT:
M9PzA'}4W6 MaskBits&=~SHIFTBIT;
Id(wY$C&> break;
HNMVs]/e default: //judge the key and send message
P&g.%8b~84 break;
n1E^8[~' }
r.~^h^c] for(int index=0;index<MAX_KEY;index++){
L/+KY_b:* if(hCallWnd[index]==NULL)
s7
K](T4 continue;
q8=hUD%5C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#Rw9Iy4 {
^.Xom~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
PV(TDb:0 bProcessed=TRUE;
q@+#CUa&n }
$~G=Hcl9 }
_yH=w'8. }
+k?0C?/T; else if((lParam&0xc000ffff)==1){ //Key down
_+0QQ{'N switch(wParam)
kv8
/UW {
jI%g! case VK_MENU:
Q($.s=&l; MaskBits|=ALTBIT;
2D vKW%; break;
'#*5jn]CqB case VK_CONTROL:
8lJMD %Df: MaskBits|=CTRLBIT;
)=9EShz! break;
zZh\e,* case VK_SHIFT:
.ou#BWav/ MaskBits|=SHIFTBIT;
0*4h}t9j break;
um5n3=K default: //judge the key and send message
h ycdk1SN break;
QPZ|C{Ce }
Vmb `%k20' for(int index=0;index<MAX_KEY;index++)
p$+.] {
naaww if(hCallWnd[index]==NULL)
Fx]}<IudA^ continue;
7%7 \2!0J} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
y]YUuJ9a {
m1\+~*i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
;Q{~jT bProcessed=TRUE;
zEJZ, < }
FHv^^u'@ }
P_y8[Y]? }
"4Bk if(!bProcessed){
\~4IOu for(int index=0;index<MAX_KEY;index++){
+#wh`9[wBt if(hCallWnd[index]==NULL)
$p?TE8G continue;
C%LXGMt if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p2)563#RS SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
pIbm)- }
&}."sGK }
EZw<)Q }
[(d))(M$| return CallNextHookEx( hHook, nCode, wParam, lParam );
PSR21; }
B{dR/q3;@ fEgwQ-] BOOL InitHotkey()
c:OFBVZ {
cZFG~n/ if(hHook!=NULL){
s<hl>vY_' nHookCount++;
qTV;L- return TRUE;
->q^$#e }
{g@?\ else
wusj;v4C4M hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
QGkMT+A if(hHook!=NULL)
PQJI~u9te} nHookCount++;
='U>P(
R- return (hHook!=NULL);
na)-' }
EsK.g/d BOOL UnInit()
tpQ?E<O {
9`8D Ga if(nHookCount>1){
R32A2Ml nHookCount--;
KN\*|) return TRUE;
#J_+
SL[ }
L2$`S'U W BOOL unhooked = UnhookWindowsHookEx(hHook);
BnwYyh if(unhooked==TRUE){
or)v:4PXW nHookCount=0;
^v+3qm@, hHook=NULL;
s/cclFji] }
=IC
cN| return unhooked;
R/BW$4/E }
J.;{`U=: 9=FqI50{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
q wd7vYBc, {
r}%2;!T BOOL bAdded=FALSE;
hP$v,"$ for(int index=0;index<MAX_KEY;index++){
xoQ;fVNp if(hCallWnd[index]==0){
KO''B or hCallWnd[index]=hWnd;
J}M_Ka HotKey[index]=cKey;
G-#]|) HotKeyMask[index]=cMask;
QY}1i .f bAdded=TRUE;
*41
2)zEy KeyCount++;
6&qT1nF1
break;
Z+EN]02| }
.r4M]1Of }
5k]xi)% return bAdded;
eX0ASI9 }
1v2pPUH\ zc4l{+3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F&[MyX U4 {
3~5%6` BOOL bRemoved=FALSE;
7LZA!3 for(int index=0;index<MAX_KEY;index++){
|OarE2 if(hCallWnd[index]==hWnd){
T^F9A55y if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
LF?MO1!M hCallWnd[index]=NULL;
{S*:pG:+q HotKey[index]=0;
X`'
@G HotKeyMask[index]=0;
C(jUM!m bRemoved=TRUE;
+@5@`"Jry KeyCount--;
T:?01?m break;
FM=-^l, }
G1z0q3< B }
Qi?xx') }
%<?U`o@* return bRemoved;
.R! /?eN }
S)L(~N1 L4) void VerifyWindow()
1nAAs;`' {
23_\UTM}1 for(int i=0;i<MAX_KEY;i++){
x+;"(]# if(hCallWnd
!=NULL){ vOnhJN
if(!IsWindow(hCallWnd)){ *v6 j7<H
hCallWnd=NULL; r@v_hc
HotKey=0; YI!@,t
HotKeyMask=0; 9@{=2 k
KeyCount--; c!20((2|I
} !%,k]m'
} `k.Nphx~%
} g*a|QBj%
} cE SSSH!m
*\4u :1Cu
BOOL CHookApp::InitInstance() [:xpz,
{ U?W?VEOO!7
AFX_MANAGE_STATE(AfxGetStaticModuleState()); @b2JR^
hins=AfxGetInstanceHandle(); -ZKo/N>6}
InitHotkey(); j$Unw
return CWinApp::InitInstance(); 9d8bh4[
} T>e4Og"?
\
W.uV[\
int CHookApp::ExitInstance() DuzJQSv
{ FXd><#U
VerifyWindow(); i<>zN^zn
UnInit(); p^/6Rb"e
return CWinApp::ExitInstance(); #lo1GoL\
} \pJBBG
3<vw#]yL
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file n |Is&fy
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )cUFb:D*"
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >ngP\&\
#if _MSC_VER > 1000 {S2?
}
#pragma once !hS~\+E
#endif // _MSC_VER > 1000 `fm^#Nw
u?-X07_
class CCaptureDlg : public CDialog PY{])z3N
{ !b:;O
+[
// Construction cZd{K[fuK
public: %g+*.8;"b
BOOL bTray; jcVK4jW
BOOL bRegistered; N sNk
BOOL RegisterHotkey(); v$_YZm{!<
UCHAR cKey; :^H#i:4
UCHAR cMask; c(5r
void DeleteIcon(); fBZAO
void AddIcon(); <~ 9a3c?
UINT nCount; @Fs2J_v
void SaveBmp(); U5!T-o;3}
CCaptureDlg(CWnd* pParent = NULL); // standard constructor `:&jbd4H
// Dialog Data B^yA+&3HI
//{{AFX_DATA(CCaptureDlg) Cg 4l*"_
enum { IDD = IDD_CAPTURE_DIALOG }; }US^GEs(
CComboBox m_Key; "PhP1;A9,
BOOL m_bControl; xfsf
BOOL m_bAlt; kH9P(`;Vq
BOOL m_bShift; 64jFbbd-/
CString m_Path; O>)Fl42IeD
CString m_Number; p.50BcDg
//}}AFX_DATA 2zQ62t}
// ClassWizard generated virtual function overrides V \4zK$]
//{{AFX_VIRTUAL(CCaptureDlg) ` 0}z
;&:
public: ;kv/(veQ1<
virtual BOOL PreTranslateMessage(MSG* pMsg); t=B>t S.hO
protected: [Kc"L+H\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &]xOjv/?
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U`w `Cr
//}}AFX_VIRTUAL 6^vseVx
// Implementation Yj-JB
protected: 5:W5@e{
HICON m_hIcon; `N.^+Mvx-
// Generated message map functions I C?bqC+
//{{AFX_MSG(CCaptureDlg) $-Wn|w+h<a
virtual BOOL OnInitDialog();
7%g8&d
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B>=NE.ulUL
afx_msg void OnPaint(); ~EJ+<[/
afx_msg HCURSOR OnQueryDragIcon(); We51s^(
virtual void OnCancel(); qS.TVNZ
afx_msg void OnAbout(); 34e>R?J
afx_msg void OnBrowse(); E!_mXjlPc
afx_msg void OnChange(); +T|M U
//}}AFX_MSG |?=a84n1l
DECLARE_MESSAGE_MAP() _RI!Z
}; 07FS|>DM'Z
#endif 0! 6n
aUVJ\;V
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^}>Ie03m50
#include "stdafx.h" v0|[w2Q2
#include "Capture.h" ecg>_%.>
#include "CaptureDlg.h" k.MAX8
#include <windowsx.h> oMNgyAp^
#pragma comment(lib,"hook.lib") +?I1Og
#ifdef _DEBUG { t1|6R0
#define new DEBUG_NEW dY6A)[dAH'
#undef THIS_FILE ^S]-7>Yyr
static char THIS_FILE[] = __FILE__; hnf7Q l}
#endif 4x;vn8yh
#define IDM_SHELL WM_USER+1 9]E;en NQ
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ja1WI
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %;0l1X
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I]dt1iXu_{
class CAboutDlg : public CDialog I0v$3BQ4
{ .>A`FqV$~+
public: d@u)'AY%/
CAboutDlg(); p#fd+
// Dialog Data Kx[u9MD
//{{AFX_DATA(CAboutDlg) 93+p~?
enum { IDD = IDD_ABOUTBOX }; gs?=yNL
//}}AFX_DATA G5K_e:i
// ClassWizard generated virtual function overrides _pM~v>~*+
//{{AFX_VIRTUAL(CAboutDlg) vsDR@Y}k
protected: *pMu,?uE
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <XAW-m9SC
//}}AFX_VIRTUAL W{6%Hhp
// Implementation djGzJLH
protected: +2WvGRC
//{{AFX_MSG(CAboutDlg) H/Wo~$
//}}AFX_MSG I<v:xTor
DECLARE_MESSAGE_MAP() -kZOve|5
}; h_{//W[
PX%Y$`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4IEF{"c_8
{ g*uo2-MN&e
//{{AFX_DATA_INIT(CAboutDlg) sh|@X\EZO
//}}AFX_DATA_INIT aLKvl~s;m
} GLIe8T*ht
N9s ,..
void CAboutDlg::DoDataExchange(CDataExchange* pDX) H|]~(.w 1}
{ XNm%O
CDialog::DoDataExchange(pDX); V< ]l=JOd
//{{AFX_DATA_MAP(CAboutDlg) ,cg%t9
//}}AFX_DATA_MAP fsr0E=nV
} | D?lF
a`:ag~op@&
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) icnc5G
//{{AFX_MSG_MAP(CAboutDlg) N Dt +m
// No message handlers NE'4atQ|
//}}AFX_MSG_MAP B"9 /+Yj
END_MESSAGE_MAP() 5qx,b&^w
AnUOv2
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y66V`,e0
: CDialog(CCaptureDlg::IDD, pParent) F_ Cp,
{ 5*#!w1X
//{{AFX_DATA_INIT(CCaptureDlg) E$w2SQ
m_bControl = FALSE; [l9iWs'M
m_bAlt = FALSE; b}eBy
m_bShift = FALSE; ?mjQN|D
m_Path = _T("c:\\"); `!t+sX-n
m_Number = _T("0 picture captured."); = @UgCu>=
nCount=0; N8s2v W
bRegistered=FALSE; Oy,`tG0
bTray=FALSE; JkiMrpkuk
//}}AFX_DATA_INIT ls<7Qe"a
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'aFj yY?%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); j; RnA>oKc
if (pSysMenu != NULL) j\ dY
{ (($"XOU
CString strAboutMenu; |#r[{2sS
strAboutMenu.LoadString(IDS_ABOUTBOX); D9#?l<D
if (!strAboutMenu.IsEmpty()) r dc}e"v
{ Q|^TR__
pSysMenu->AppendMenu(MF_SEPARATOR); 7d7"^M
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1b6ox6
} ~m]sJpW<"
} /p=9"?
SetIcon(m_hIcon, TRUE); // Set big icon !+E|{Zj
SetIcon(m_hIcon, FALSE); // Set small icon ~}c`r 4
m_Key.SetCurSel(0); 2(,
`9
RegisterHotkey(); E%f;Z7G
CMenu* pMenu=GetSystemMenu(FALSE); rY
0kzD/
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ; U)a)l'y
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1lxsj{>U
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2hjR'6h"Y
return TRUE; // return TRUE unless you set the focus to a control 1D,$Az~.
} A1zqm_X5)P
HlkG^:)
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2^Tj@P7
{ T@n-^B !Xq
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Zl0Kv*S
{ nbnbG0r:
CAboutDlg dlgAbout; o4)^U t+
dlgAbout.DoModal(); wW7W+,{o
} pP4i0mO{Dv
else )-_NtMr~`!
{ :y?xS
CDialog::OnSysCommand(nID, lParam); _L6WbRu|
} M NE{mV(
} ^8mF0K&
X[frL)k]
void CCaptureDlg::OnPaint() uc%
&g
{ 5$r`e+Nf'
if (IsIconic()) kKFSCl/g
{ b6IYo!3
CPaintDC dc(this); // device context for painting *cdr,AD?lH
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !bnuC c
// Center icon in client rectangle idm!6]
int cxIcon = GetSystemMetrics(SM_CXICON); )\:cL GM
int cyIcon = GetSystemMetrics(SM_CYICON); =:+k
CRect rect; 0hKF)b
GetClientRect(&rect); p< fKj
int x = (rect.Width() - cxIcon + 1) / 2; _)J;PbK~
int y = (rect.Height() - cyIcon + 1) / 2; d9zI
A6y
// Draw the icon >uok\sX
dc.DrawIcon(x, y, m_hIcon); @#T*OH
} dQ=mg#(
else hcw)qB,s
{ BReNhk)S
CDialog::OnPaint();
f6 zT
} 6]i"lqb
} 8{5Y%InL
gI&& LwT4
HCURSOR CCaptureDlg::OnQueryDragIcon() &%~2Wm
{ {iP^51fy
return (HCURSOR) m_hIcon; |~mi6 lJ6
} M DnT
})V9d
void CCaptureDlg::OnCancel() ^A8'YTl
{ Ni5~Buf
if(bTray) la ~T)U7
DeleteIcon(); U!:Q|':=h
CDialog::OnCancel(); D6iHkDTg
} tJ>OZ
:X>%6Xj?RV
void CCaptureDlg::OnAbout() Zho d %n3
{ mPNT*pAO
CAboutDlg dlg; f>)k<-<yj
dlg.DoModal(); SxMrX C*
} q$EicH}k8
IqK??KSC
void CCaptureDlg::OnBrowse() aU]A#g
{ pYo]lO
CString str; $_-f}E
BROWSEINFO bi; G9s: Wp
char name[MAX_PATH]; +OFq=M
ZeroMemory(&bi,sizeof(BROWSEINFO)); `A@{})+
bi.hwndOwner=GetSafeHwnd(); \UI7H1XDH
bi.pszDisplayName=name; ]X,C9
bi.lpszTitle="Select folder"; [&n2 yt
bi.ulFlags=BIF_RETURNONLYFSDIRS; m~ %\f8w-x
LPITEMIDLIST idl=SHBrowseForFolder(&bi); p=U*4[9k
if(idl==NULL) *0)vsBi
return; 6(4FC?Y7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); /I{<]m$
str.ReleaseBuffer(); %eCbH`
m_Path=str; ':8yp|A|
if(str.GetAt(str.GetLength()-1)!='\\') BN&^$1F((
m_Path+="\\"; t\nYUL-H
UpdateData(FALSE); ?Kw~O"L8
} {n8mE,;M
3^l@!Qw
void CCaptureDlg::SaveBmp() +K4d(!Sb
{ Z~^)B8
CDC dc; .g.v
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 'rJkxU{
CBitmap bm; A4.Q\0
int Width=GetSystemMetrics(SM_CXSCREEN); WJ$D]7
int Height=GetSystemMetrics(SM_CYSCREEN); * B!uYP
bm.CreateCompatibleBitmap(&dc,Width,Height); {J2*6_
CDC tdc; ~6`HJ
tdc.CreateCompatibleDC(&dc); !Q!==*1H
CBitmap*pOld=tdc.SelectObject(&bm); Hu|;cbK
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K
&m`1f
tdc.SelectObject(pOld); umrfA
BITMAP btm; Bk&ry)`gD
bm.GetBitmap(&btm); dEU+\NY
DWORD size=btm.bmWidthBytes*btm.bmHeight; !(PAUWS@
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); NF <|3|
BITMAPINFOHEADER bih; 8 /1 sy.R
bih.biBitCount=btm.bmBitsPixel; z=>U>
bih.biClrImportant=0; <A +VS
bih.biClrUsed=0; R]e?<,"X
bih.biCompression=0; c%_I|h<?iT
bih.biHeight=btm.bmHeight; UD`bK a`E
bih.biPlanes=1; RiC1lCE
bih.biSize=sizeof(BITMAPINFOHEADER); LutP&Ebt8
bih.biSizeImage=size; oJJ2y
bih.biWidth=btm.bmWidth; 0R&$P6
bih.biXPelsPerMeter=0; b f.__3{
bih.biYPelsPerMeter=0; 5LU8QHj3
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;
F% 3b47
static int filecount=0; nZe2bai
CString name; /k3v\Jq{
name.Format("pict%04d.bmp",filecount++); F$P8"q+
name=m_Path+name; ]6NpHDip1
BITMAPFILEHEADER bfh; iE$qq~%
bfh.bfReserved1=bfh.bfReserved2=0; '`Eb].s*
bfh.bfType=((WORD)('M'<< 8)|'B'); _NQMi4 V(
bfh.bfSize=54+size; E}K6Op;=v5
bfh.bfOffBits=54; >[;+QVr;
CFile bf; @l:\0cO
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){
L5/J
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); xMNUyB{?
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !, Y1FC
bf.WriteHuge(lpData,size); H'E(gc)>)
bf.Close(); $s-/![
6
nCount++; VWqmqR%
} .}Va~[0j
GlobalFreePtr(lpData); 9~i=Af@
if(nCount==1) Jhdo#}Ub
m_Number.Format("%d picture captured.",nCount); R7u &`
else $d2mcwh\
m_Number.Format("%d pictures captured.",nCount);
1+|s
UpdateData(FALSE); BH"f\oc
} x5[wF6A
ZYr6Wn
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k^B<t'
{ D+G?:mR
if(pMsg -> message == WM_KEYDOWN) $'#hCs
{ f& P'Kxj_
if(pMsg -> wParam == VK_ESCAPE) 0Z9>%\km_
return TRUE; I;xrw?=\L
if(pMsg -> wParam == VK_RETURN) 8UiRirw
return TRUE; ^ Q]I)U
} W8{g<.
/
return CDialog::PreTranslateMessage(pMsg); z\wY3pIr2
} EM9K^l`
wp7<0PP
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yClX!OL
{ -?L~\WJAL
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G^E"#F
SaveBmp(); Kx,#Wg{H
return FALSE; !Au'WJfE
} [?z`XY_-
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~JhH ,E
CMenu pop; ASA ]7qyO
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F
uYjrzmx
CMenu*pMenu=pop.GetSubMenu(0); OolYQU1_
pMenu->SetDefaultItem(ID_EXITICON); L-Io!msb
CPoint pt; aQzDOeTi
GetCursorPos(&pt); ,gAa9
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); oD1rt>k
if(id==ID_EXITICON) s6=jHrdvv
DeleteIcon(); ]\DZW4?'
else if(id==ID_EXIT) 4mYJ i#e6x
OnCancel(); 9 Z,K
return FALSE; Fo\* Cr9D
} ejs_ ?
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %l{0z<
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /G*]3=cSe
AddIcon(); >1luLp/,$
return res; ;ED` 7
} JmlMfMpXMs
/j%(Z/RM
void CCaptureDlg::AddIcon() 5dwC~vn}c
{ Lg6;FbY?
NOTIFYICONDATA data; eO7 )LM4
data.cbSize=sizeof(NOTIFYICONDATA); 8zhr;Srt
CString tip; w)xiiO[
tip.LoadString(IDS_ICONTIP); L>xecep
data.hIcon=GetIcon(0); FFC"rG
data.hWnd=GetSafeHwnd(); ~)ut"4
strcpy(data.szTip,tip); ))M!"*
data.uCallbackMessage=IDM_SHELL; \N3A2L)l
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \PU7,*2
data.uID=98; Q`= ,&;T>
Shell_NotifyIcon(NIM_ADD,&data); n:dnBwY
ShowWindow(SW_HIDE); f%#q}vK-
bTray=TRUE; 'P'f`;'_DC
} ":igYh
$)or{Z$&
void CCaptureDlg::DeleteIcon() o'Rr2,lVi
{ {N.JA=
NOTIFYICONDATA data; \3K%>
data.cbSize=sizeof(NOTIFYICONDATA); *z?Vy<u G
data.hWnd=GetSafeHwnd(); P|U9f6^3
data.uID=98; `IC2}IiF
Shell_NotifyIcon(NIM_DELETE,&data); 2Q bCH}
ShowWindow(SW_SHOW); P]h-**O
SetForegroundWindow(); *I)F5M
ShowWindow(SW_SHOWNORMAL); eHX;*~e6)
bTray=FALSE; <rQ+ErDA
} opaRk.p
7&O0
void CCaptureDlg::OnChange() YB`1S
{ ]7|Zs]6
RegisterHotkey(); cmcR@zv
} I
0vJJP#
8cKP_Ec
BOOL CCaptureDlg::RegisterHotkey() 1iLrKA
{ e-E0Bp
UpdateData(); ~7;AV(\%e
UCHAR mask=0; [N=v=J9
UCHAR key=0; 8?l/x
if(m_bControl) yq6Gyoi<
mask|=4; 7cMHzhk^
if(m_bAlt) m7$t$/g
mask|=2; Gf<f#.5y
,
if(m_bShift) eVRPjVzQ'Q
mask|=1; 9_Ws8nE
key=Key_Table[m_Key.GetCurSel()]; ,SV34+(
if(bRegistered){ FTJvkcc?m
DeleteHotkey(GetSafeHwnd(),cKey,cMask); UI]UxEJ
bRegistered=FALSE; ?GT,Y5
}
b
fj]Q
cMask=mask; V'M#."Of/
cKey=key; L9}%tEP
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); IIh \d.o
return bRegistered; Fo.p}j+>
} 'nQQqx%v
]@P!Q&V #
四、小结 9]4 W
_Dq,\}
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。