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:
yv>uzb`N
es.Y 一、实现方法
p|a`Q5z! F{.g05^y 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:
I69Z'}+qz ]gv3|W #pragma data_seg("shareddata")
O*,O]Q HHOOK hHook =NULL; //钩子句柄
e7&RZ+s#wZ UINT nHookCount =0; //挂接的程序数目
H$Pf$D$ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
-~4kh]7% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
2e3AmR@* static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
-ik((qx_ static int KeyCount =0;
f(!cz,y^\* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
p-rQ'e #pragma data_seg()
[C~N#S[] ",,.xLI7 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。
Q^l!cL| { `022gHYv 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:
_,UYbD\[J} 6U%d3"T BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
[)I
W9E
v cKey,UCHAR cMask)
FB>P39u {
cd=H4:<T5 BOOL bAdded=FALSE;
p?P.BU\CR for(int index=0;index<MAX_KEY;index++){
m6xbO if(hCallWnd[index]==0){
UCFFF% hCallWnd[index]=hWnd;
';D>Z?l HotKey[index]=cKey;
l^}5PHLd HotKeyMask[index]=cMask;
K>XZrt bAdded=TRUE;
EUH9R8) KeyCount++;
w Bm4~~_ break;
p}wysVB }
<4 /q5*& }
|q\i, } return bAdded;
cSG(kFQ }
> #9
a&O //删除热键
BrzTOkeyG BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\RFA?PuY {
/;21?o BOOL bRemoved=FALSE;
&f?JtpB for(int index=0;index<MAX_KEY;index++){
EKsOj&ZiJ if(hCallWnd[index]==hWnd){
HAs/f#zAk6 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
PG|Zu3[ hCallWnd[index]=NULL;
%P#|
} HotKey[index]=0;
a8k`Wog HotKeyMask[index]=0;
GU Mf}y bRemoved=TRUE;
9]tW; ? KeyCount--;
M.)z;[3O break;
G2@'S&2@s }
]<q!pE;t }
["ocZ? x }
`(O#$n return bRemoved;
$,I@c"m{ }
JEZ0O&_R ;4v`FC> ,,)'YhG( DLL中的钩子函数如下:
$I ,Np)i Ze[\y(K! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Jk{v(W# {
G#uB%:)&0u BOOL bProcessed=FALSE;
jC?l :m? if(HC_ACTION==nCode)
EF=5[$
u {
07ppq?,y if((lParam&0xc0000000)==0xc0000000){// 有键松开
7nW <kA switch(wParam)
^d(gC%+!u {
.O+,1&D5 case VK_MENU:
)QnsRW{D" MaskBits&=~ALTBIT;
g0;6}n break;
I_`NjJ;61 case VK_CONTROL:
/@DJf\`vM MaskBits&=~CTRLBIT;
YuzVh9jTI break;
l6IT o@&J case VK_SHIFT:
]}]+aB MaskBits&=~SHIFTBIT;
R7FI{A break;
u-V(
2? default: //judge the key and send message
hW;n^\lF#e break;
mOLz(0 }
-ni@+Dy for(int index=0;index<MAX_KEY;index++){
j4=\MK if(hCallWnd[index]==NULL)
;LKYA?=/V continue;
x&EMg! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QNXS.!\P {
W3%RB[s- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0}9j l bProcessed=TRUE;
U2Ky4UFm }
%y)hYLOJ }
>f|0# * }
;oVOq$ql else if((lParam&0xc000ffff)==1){ //有键按下
n
\&H~0X switch(wParam)
/WX&UAG {
Ru);wzky case VK_MENU:
@bnw$U`+ MaskBits|=ALTBIT;
&{q'$oF break;
}XCh>LvX case VK_CONTROL:
8#1o MaskBits|=CTRLBIT;
/Vx
EqIK break;
AB<bW3qf( case VK_SHIFT:
N\CHIsVm> MaskBits|=SHIFTBIT;
E^pn-rB break;
}R hSt] default: //judge the key and send message
l$W)Vk<B(T break;
t[G7&ovj
}
9p4SxMMO for(int index=0;index<MAX_KEY;index++){
:)+)L@By if(hCallWnd[index]==NULL)
#9qX:*>h continue;
z>
N73 u if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2Z`Jr/ {
"tA.`* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
l)EtK&er(} bProcessed=TRUE;
4>Nig.# }
_C'VC#Sy }
]/[@.
}
/}CAd if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
yK_$d0ZGE~ for(int index=0;index<MAX_KEY;index++){
kmu7~&75 if(hCallWnd[index]==NULL)
.n?i'8 continue;
'3E25BsL if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?dCJv_w SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~BnmAv$m[ //lParam的意义可看MSDN中WM_KEYDOWN部分
QG@Z%P~,E }
lJS3*x#H }
sc rss }
)}i2x:\|_ return CallNextHookEx( hHook, nCode, wParam, lParam );
rD c$# }
2B_+5 }me`(zp 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
`bd9N!K i+I1h= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
VZ9`Kbu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
VQ+G. b,(<74!#8 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
9.6ni1a' )2:U]d%pk LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
6/Z_r0^O {
Scmew if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/-=h|A#Kh {
^Q!A4qOQ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
&u(pBr8B SaveBmp();
8Qkwg]X return FALSE;
OY!WEP$F-C }
JbXi|OS/ …… //其它处理及默认处理
F C=N}5u }
9*r l7 e8z?) 4T <DEu]-'> 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。
$bZ5@)E *I k/Vu%; 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
| "eC0u :G5O_T$ 二、编程步骤
e&Z ?I2J A3.pz6iT> 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";
1h{7dLA 5/HkhTyj 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
(/i|3 P RgzzbW 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;
e
:@PI(P! >;fn,9w 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;
4-C'2? G
P '- 5、 添加代码,编译运行程序。
m;>:mwU RiIafiaD 三、程序代码
>#Bu [nD% zN\C ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
KJt6d`ZN #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
(:}}p}u #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
X 0LC:0+ #if _MSC_VER > 1000
Yv"B-oy #pragma once
NK%Ok #endif // _MSC_VER > 1000
FbW$H]C$ #ifndef __AFXWIN_H__
]Z[0xs #error include 'stdafx.h' before including this file for PCH
!H6X%hlk #endif
bj?=\u #include "resource.h" // main symbols
<J.q[fd1* class CHookApp : public CWinApp
(Hs,Tj {
'GLpSWL+* public:
QEF$Jx CHookApp();
Z55C4F5v // Overrides
&=wvlI52` // ClassWizard generated virtual function overrides
}8`>n4 //{{AFX_VIRTUAL(CHookApp)
*mW 2vJ/B public:
vxrqUjK7 virtual BOOL InitInstance();
Mh}vr%0;) virtual int ExitInstance();
_93:_L //}}AFX_VIRTUAL
zbvV:9N //{{AFX_MSG(CHookApp)
In;+wFu;M // NOTE - the ClassWizard will add and remove member functions here.
ZCNO_g // DO NOT EDIT what you see in these blocks of generated code !
*\`<=,H6< //}}AFX_MSG
[|(=15; DECLARE_MESSAGE_MAP()
$1k@O@F(4 };
<%=<9~e LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
D@c@Dt BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\\`(x:\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
akWOE}5# BOOL InitHotkey();
Xv 7noq| BOOL UnInit();
BUyKiMW 49 #endif
mR8tW"Z2 yI%q3lB}^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/.sho\a #include "stdafx.h"
isFxo,R9r #include "hook.h"
X-psao0tI` #include <windowsx.h>
w`gT]Rn #ifdef _DEBUG
6Q]JY,+ #define new DEBUG_NEW
rshUF #undef THIS_FILE
6LabFX@{& static char THIS_FILE[] = __FILE__;
7'|aEH #endif
t8*NldC #define MAX_KEY 100
}?sC1]-j& #define CTRLBIT 0x04
y!_8m#n S #define ALTBIT 0x02
3kVN[0 #define SHIFTBIT 0x01
Au:R]7 #pragma data_seg("shareddata")
zA/Fh(uX HHOOK hHook =NULL;
3h}i="i UINT nHookCount =0;
8U!$()^? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
d *#.(C9^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
7&w| static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
'UC1!Z static int KeyCount =0;
%pf9Yd0t static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
bo@,
B #pragma data_seg()
z8xBq%97us HINSTANCE hins;
W mx3@]< void VerifyWindow();
+M<W8KF BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
'c3'eJ0 //{{AFX_MSG_MAP(CHookApp)
B|'}HBkP // NOTE - the ClassWizard will add and remove mapping macros here.
Tf('iZ2+ // DO NOT EDIT what you see in these blocks of generated code!
wNmC1HOh //}}AFX_MSG_MAP
T>J ,kh END_MESSAGE_MAP()
#G=AD/z eL{$=Um CHookApp::CHookApp()
DD`DU^o< {
Gz(l~!n~a // TODO: add construction code here,
PM'2zP[*W // Place all significant initialization in InitInstance
#)O^aac29 }
1pjx8*!B !t\sg CHookApp theApp;
(/X]9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@3bVjQ`4f {
l\|sHn/ BOOL bProcessed=FALSE;
nwIj?(8x if(HC_ACTION==nCode)
]0W64cuT {
e&!8UYP if((lParam&0xc0000000)==0xc0000000){// Key up
$xjfW/k?M switch(wParam)
PX` xr1o {
6E.[F\u case VK_MENU:
s-~`Ao'
< MaskBits&=~ALTBIT;
DgB;6Wl break;
_CBMU'V case VK_CONTROL:
"/ Gw`^t MaskBits&=~CTRLBIT;
c:<a"$ break;
Z$zX%w case VK_SHIFT:
d]N_<@tx9 MaskBits&=~SHIFTBIT;
}c>vk break;
>P//]nn default: //judge the key and send message
jBl$r{L break;
gAf4wq }
!T
9CpIM% for(int index=0;index<MAX_KEY;index++){
8~&=vc if(hCallWnd[index]==NULL)
6?[SlPPE1 continue;
,LDL%<7t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@Bn4ZFB@ {
m;L3c(r. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
7xYz9r)w` bProcessed=TRUE;
)g}G{9M^ }
6~x a^3G: }
tD4-Llj6 }
I&<'A[vHl else if((lParam&0xc000ffff)==1){ //Key down
1aUg({ switch(wParam)
b~@+6? {
}}k*i0 case VK_MENU:
5u3KL
A MaskBits|=ALTBIT;
?Mn~XN4F_ break;
{dn:1IcN case VK_CONTROL:
l}&2A*c. MaskBits|=CTRLBIT;
D0z[h(m break;
F/3L^k] case VK_SHIFT:
B+Ft
> MaskBits|=SHIFTBIT;
KVUub'k break;
$`lm]} {& default: //judge the key and send message
\,r*-jr break;
0j8`M"6 }
afzx?ekdF for(int index=0;index<MAX_KEY;index++)
?e,:x ]\L {
>y(loMl if(hCallWnd[index]==NULL)
1b 2 continue;
=E^/gc%X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I5`>XfO) {
Wh~,?}laj SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
5)5yH bS bProcessed=TRUE;
t*H|*L#YR }
-Q&@P3x }
S4-jF D)U }
t)rPXvx}! if(!bProcessed){
0WYu5| for(int index=0;index<MAX_KEY;index++){
'2|P-/jU if(hCallWnd[index]==NULL)
Mc!LC
.8 continue;
(U_HX2f if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
yK$aVK" SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
b#R$P]dr= }
pS}IU{#; }
~tZB1+%) }
#,1z=/d. return CallNextHookEx( hHook, nCode, wParam, lParam );
lNl.lI\t)y }
leI ]zDk= %~8f0B|im BOOL InitHotkey()
E> $_
$' {
pZ3sp! if(hHook!=NULL){
T<NOLfk66 nHookCount++;
#f/4%|t: return TRUE;
99CK [G }
sLXM$SMBh else
Fw
t hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
c\&;Xr if(hHook!=NULL)
\sfc!5G nHookCount++;
'> n&3`r5 return (hHook!=NULL);
hw*u. 46 }
*c&OAL] BOOL UnInit()
LZ.Xcy {
A1`6+8}o;b if(nHookCount>1){
lNtxM"G& nHookCount--;
1i_%1Oip return TRUE;
3la `S$c }
K<`W>2" BOOL unhooked = UnhookWindowsHookEx(hHook);
_Hfpizm if(unhooked==TRUE){
5`g VziS!S nHookCount=0;
}V`_(%Q-e hHook=NULL;
-K H"2q }
>]C/ Q6 return unhooked;
m g@Ol"2 }
(@qS AE~@F4MK BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
dqo-.,= {
1~3dX[& BOOL bAdded=FALSE;
:]CL}n$* for(int index=0;index<MAX_KEY;index++){
;Bj&9DZd if(hCallWnd[index]==0){
a1/+C$
oB hCallWnd[index]=hWnd;
k;2.g$)W[c HotKey[index]=cKey;
\8s:I+[HH HotKeyMask[index]=cMask;
pV;0Hcy bAdded=TRUE;
w-xigm>{Z KeyCount++;
5MD'AP: break;
(E&M[hH+ }
ZbjUOlE02 }
,J-|.ER-> return bAdded;
p]/[ji }
r|jM; ~K99DK. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
R[S1<m; {
yXv@yn BOOL bRemoved=FALSE;
h z{-- for(int index=0;index<MAX_KEY;index++){
O8_!!Qd if(hCallWnd[index]==hWnd){
&zJ*afi) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
\=mLL|a hCallWnd[index]=NULL;
+zq"dj_ HotKey[index]=0;
@TX@78fWz= HotKeyMask[index]=0;
)*{B_[ bRemoved=TRUE;
Sy4|JM-5 KeyCount--;
#s15AyKz5 break;
3 H5 }
o?t H[ }
N:k>V4oE }
tcsb]/my return bRemoved;
r
jxkgd }
B8n[ E N5ZOpRH{ void VerifyWindow()
1_v\G {
_z{9V7n4 for(int i=0;i<MAX_KEY;i++){
q(^iT~} if(hCallWnd
!=NULL){ RWo7_X O
if(!IsWindow(hCallWnd)){ wvxz:~M
hCallWnd=NULL; 9p3~WA/M@
HotKey=0; g1"ZpD
HotKeyMask=0; zwJ&K;"y(
KeyCount--; J'7;+.s(
} Ql l{;A
} 5(hv|t/a
} v1X[/\;U
} T4"D&~3
3q
ztX$kX:_m
BOOL CHookApp::InitInstance() ;v2eAe@7
{ 0)~c)B:5
AFX_MANAGE_STATE(AfxGetStaticModuleState()); $@71 w~y
hins=AfxGetInstanceHandle(); QRBx}!:NZ#
InitHotkey(); %O" Whe
return CWinApp::InitInstance(); ,+6u6
} ruB D
^-
g<M!]0OK
int CHookApp::ExitInstance() HiU)q
{ ~9vK6;0
VerifyWindow(); ujmIS~"
UnInit(); nqUnDnP2c
return CWinApp::ExitInstance(); -.8K"j{N
} a|oh Ad
t&q~ya/C
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file w4\
3*
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #{J~
km /
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ N#"l82^H*
#if _MSC_VER > 1000 I^ ![)# FC
#pragma once lN,a+S/'
#endif // _MSC_VER > 1000 \y(3b#
7(h@5
class CCaptureDlg : public CDialog YW/V}C'>
{ 3Wv^{|^
// Construction n5.sx|bI?
public: xsJXf @
BOOL bTray; 6vE#$(n#a&
BOOL bRegistered;
DwGM+)!
BOOL RegisterHotkey(); ;R#RdUFH
UCHAR cKey; Rk#'^}
UCHAR cMask; y2s(]#8
void DeleteIcon(); j=M%*`@
void AddIcon(); BSgT
6K
UINT nCount; ?2Z`xL9QT
void SaveBmp(); 6Q]c}
CCaptureDlg(CWnd* pParent = NULL); // standard constructor R5^6Kwu
// Dialog Data E&y)`>Nq{
//{{AFX_DATA(CCaptureDlg) Xy=ETV%
enum { IDD = IDD_CAPTURE_DIALOG };
3x+=7Mg9
CComboBox m_Key; 2sk7E'2(
BOOL m_bControl; ``:[Jr&
BOOL m_bAlt; NQ 6oyg@&
BOOL m_bShift; 1v`|mU}i,
CString m_Path; E7? n'!=
CString m_Number; Hv,ll1@h
//}}AFX_DATA U), HrI>;
// ClassWizard generated virtual function overrides
nYZ6'Iwi'
//{{AFX_VIRTUAL(CCaptureDlg) Y)5O %@Rl
public: la-:"gKC
virtual BOOL PreTranslateMessage(MSG* pMsg); $6wSqH?q
protected: M57<e`m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~Hub\kn
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Sqb>aj
//}}AFX_VIRTUAL #!UJY%c~
// Implementation q6C`hVMl
protected: ?z l<"u
HICON m_hIcon; -wV2
79^b
// Generated message map functions ov,s]g83
//{{AFX_MSG(CCaptureDlg) h`N2M,
virtual BOOL OnInitDialog(); xi "3NF%=
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z|%Pi J,
afx_msg void OnPaint(); X5[t6q!
afx_msg HCURSOR OnQueryDragIcon(); {x,)OgK!{
virtual void OnCancel(); 3Q=\W<Wu
afx_msg void OnAbout(); np6G~0Y`
afx_msg void OnBrowse(); 2v4K3O60G
afx_msg void OnChange(); } f&=}
//}}AFX_MSG Zf!Q4a"
DECLARE_MESSAGE_MAP() ,;w~ VZ4
}; T:{r*zLSN
#endif }Cw,m0KV/
f*Q9u >1p
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $Uy+]9
#include "stdafx.h" ^?""'1iuQx
#include "Capture.h" U{oM*[
#include "CaptureDlg.h" M NwY
#include <windowsx.h> j;_
#pragma comment(lib,"hook.lib") ?i#x13
#ifdef _DEBUG JXe~
9/!
#define new DEBUG_NEW ly*v|(S&
#undef THIS_FILE H(76sE
static char THIS_FILE[] = __FILE__; Eq;w5;7s
#endif aaY AS"/:
#define IDM_SHELL WM_USER+1 ij-'M{f
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); } (-9d
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CV"}(1T
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Q`AlK"G,
class CAboutDlg : public CDialog !PEKMDh
{ FauASu,A
public: sa o &
CAboutDlg(); h>GbJ/^
// Dialog Data T{+a48,;
//{{AFX_DATA(CAboutDlg) ~<VxtcEBz
enum { IDD = IDD_ABOUTBOX }; 9Q s5e
//}}AFX_DATA /}U)|6-B
// ClassWizard generated virtual function overrides eQ/w
Mr
//{{AFX_VIRTUAL(CAboutDlg) #n|5ng|CJ
protected: =oL:|$Pj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =&UE67eK,
//}}AFX_VIRTUAL JnK<:]LcK
// Implementation ^" ?a)KC
protected:
{q8|/{;
//{{AFX_MSG(CAboutDlg) :+jg311}
//}}AFX_MSG @hg[v`~
DECLARE_MESSAGE_MAP() N^[
F+y
}; >VIFQ\
2ak]&ll+h
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zu
@|"f^`
{ 95@u|#n
//{{AFX_DATA_INIT(CAboutDlg) q5e(~@(z<`
//}}AFX_DATA_INIT %+j/nA1%S
} HLV8_~gQPf
U3:|!CC)T
void CAboutDlg::DoDataExchange(CDataExchange* pDX) F=e;[uK\
{ +yfUB8Xw
CDialog::DoDataExchange(pDX); UG`~RO
//{{AFX_DATA_MAP(CAboutDlg) Y(7&3+'K
//}}AFX_DATA_MAP ~\NQkaBkY
} |Vz)!M
ms}o[Z@n
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \X*y~)+K`
//{{AFX_MSG_MAP(CAboutDlg) LZ_VLW9wE
// No message handlers ,S`n?.&& 7
//}}AFX_MSG_MAP 5O]tkHYR
END_MESSAGE_MAP()
p )JR5z
|Sjy
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /FXvrH(
: CDialog(CCaptureDlg::IDD, pParent) K(upzn*a
{ us|Hb
//{{AFX_DATA_INIT(CCaptureDlg) gw,K*ph}q
m_bControl = FALSE; >^g2Tg:
m_bAlt = FALSE; QEt"T7a[/
m_bShift = FALSE; (jU_lsG
m_Path = _T("c:\\"); UwS7B~
m_Number = _T("0 picture captured."); )GG9[%H!
nCount=0; xgIb6<qwY
bRegistered=FALSE; aIa<,
bTray=FALSE; '12*'Q+{+
//}}AFX_DATA_INIT RDDA^U7y#
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 uNuFD|aQ.
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); T=-UcF
} y-.{){uaD
M}11 tUl
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |A*4Fuc&
{ 7=?!B#hm!
CDialog::DoDataExchange(pDX); G5U?]& I8
//{{AFX_DATA_MAP(CCaptureDlg) BXdk0
DDX_Control(pDX, IDC_KEY, m_Key); )m
=xf1
DDX_Check(pDX, IDC_CONTROL, m_bControl); 7M~ /
q.
DDX_Check(pDX, IDC_ALT, m_bAlt); ?C fQwY#N
DDX_Check(pDX, IDC_SHIFT, m_bShift); }W 5ks-L6
DDX_Text(pDX, IDC_PATH, m_Path); u5ZyOZ;
DDX_Text(pDX, IDC_NUMBER, m_Number); @u/CNx,`X
//}}AFX_DATA_MAP -n|>U:
} c$ib-
MCibYvc[
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {u
y^Bui}
//{{AFX_MSG_MAP(CCaptureDlg) b?`2LAgn
ON_WM_SYSCOMMAND() #|je m
ON_WM_PAINT()
$6UU58>n
ON_WM_QUERYDRAGICON() ; ,sNRES3
ON_BN_CLICKED(ID_ABOUT, OnAbout) m0^ "fMV
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 80Hi v
ON_BN_CLICKED(ID_CHANGE, OnChange) g!_#$az3
//}}AFX_MSG_MAP cFq<x=S
END_MESSAGE_MAP() -DHzBq=H
Ow> u!P!
BOOL CCaptureDlg::OnInitDialog() e6_8f*o|s
{ &':C"_|&r
CDialog::OnInitDialog(); 2C:u)}R7D
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); r{r~!=u
ASSERT(IDM_ABOUTBOX < 0xF000); Hm>cKPZ)
CMenu* pSysMenu = GetSystemMenu(FALSE); D%3$"4M7!
if (pSysMenu != NULL) sk9Ejaf6>
{ KZg2`8F
CString strAboutMenu; z0+JMZ/
strAboutMenu.LoadString(IDS_ABOUTBOX); g9^\QYh!
if (!strAboutMenu.IsEmpty()) lFtEQ '}
{ <FBH;}]
pSysMenu->AppendMenu(MF_SEPARATOR); Fl($0}ER
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); y[l{
UBue:
} I>nYI|o1
} Ek `bPQ5
SetIcon(m_hIcon, TRUE); // Set big icon <S7SH-{_\
SetIcon(m_hIcon, FALSE); // Set small icon j$_?g!I=gK
m_Key.SetCurSel(0); ^cPVnl
RegisterHotkey(); &S+*1<|`K
CMenu* pMenu=GetSystemMenu(FALSE); z6J12tu
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :35h0;8+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @a]cI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3t+{~{Dj
return TRUE; // return TRUE unless you set the focus to a control M/.M~/~
} v4Ag~Evcx
^GM3nx$
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3,v/zcV
{ m4OnRZYlw
if ((nID & 0xFFF0) == IDM_ABOUTBOX) -E6av|c,F
{ )! rD&l$tE
CAboutDlg dlgAbout; ?/MkH0[G =
dlgAbout.DoModal(); d m"R0>
} NvIg,@}
else tgCp2`n
{ U1/I(w
CDialog::OnSysCommand(nID, lParam); p2l@6\m\
} Ih5Y7<8b~
} %Bm{ctf#)
k]:`<`/I_
void CCaptureDlg::OnPaint() ".|8 (Y
{ a"xRc
if (IsIconic()) J&'*N:d
{ d_$0
CPaintDC dc(this); // device context for painting -:d{x#
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dL4VcUS.
// Center icon in client rectangle |Tmug X7
int cxIcon = GetSystemMetrics(SM_CXICON); J&h59dm-
int cyIcon = GetSystemMetrics(SM_CYICON); 'qiAmaX
CRect rect; mz1m^p)~{
GetClientRect(&rect); a'Cny((
int x = (rect.Width() - cxIcon + 1) / 2; $H3C/|
int y = (rect.Height() - cyIcon + 1) / 2; dkEbP*yXg
// Draw the icon xzY/$?
dc.DrawIcon(x, y, m_hIcon); y_[VhZ%
} ={cM6F}a@
else CZ]Dm4
{ mB0`>?#i
CDialog::OnPaint(); "Y^Fn,c
} "dv\
9O
}
MwQtf(_
NMw5ixl
HCURSOR CCaptureDlg::OnQueryDragIcon() @eBo7#Zr
{ \M.?*p
return (HCURSOR) m_hIcon; 4Yok,<
} dbEXlm
-}T7F+
void CCaptureDlg::OnCancel() K'8?%&IQ
{ 4IW90"uc
if(bTray) #
{k$Fk
DeleteIcon(); Gl{'a1
CDialog::OnCancel(); o92BGqA>&
} }T}c%p
emJZ+:%
void CCaptureDlg::OnAbout() w_`;Mn%p
{ R=Lkf
CAboutDlg dlg; |QbCFihn
dlg.DoModal(); jl7>
} [8tpU&J
> (n/
void CCaptureDlg::OnBrowse() ho^c#>81
{ `r=^{Y
CString str; 4?(=?0/[
BROWSEINFO bi; B(71I;
char name[MAX_PATH]; |uFb(kL[U
ZeroMemory(&bi,sizeof(BROWSEINFO)); l#ct;KZ
bi.hwndOwner=GetSafeHwnd(); g1F9IB42@<
bi.pszDisplayName=name; dQH8s
bi.lpszTitle="Select folder"; {7IZN< e
bi.ulFlags=BIF_RETURNONLYFSDIRS; {be|G^.c
LPITEMIDLIST idl=SHBrowseForFolder(&bi); A`vRUl,c=
if(idl==NULL) :SN? t
return; OBlQ
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $M-"az]
str.ReleaseBuffer(); G~&q
m_Path=str; :G9d,B7*
if(str.GetAt(str.GetLength()-1)!='\\') dwvc;f-
m_Path+="\\"; vfc5M6Vm)<
UpdateData(FALSE); m>[G-~0?kI
} JT6Be8
Gz\wmH&rVz
void CCaptureDlg::SaveBmp() =Ldf#8J
{ p|0SA=?k"
CDC dc; >3 p8o@:
dc.CreateDC("DISPLAY",NULL,NULL,NULL); *hFJI9G
CBitmap bm; UDkH'x$=
int Width=GetSystemMetrics(SM_CXSCREEN); +('xzW
int Height=GetSystemMetrics(SM_CYSCREEN); pkG8g5(w
bm.CreateCompatibleBitmap(&dc,Width,Height); BB1_EdoG
CDC tdc; 2^5RQl/
tdc.CreateCompatibleDC(&dc); c2GTN "
CBitmap*pOld=tdc.SelectObject(&bm); k?3mFWc
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); qixnaiZ
tdc.SelectObject(pOld); _ !"[Zr
BITMAP btm; buKkm$@w
bm.GetBitmap(&btm); A;/,</
DWORD size=btm.bmWidthBytes*btm.bmHeight; H,/=<Th;i
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S>HfyZ&Pc
BITMAPINFOHEADER bih; }{J>kgr6
bih.biBitCount=btm.bmBitsPixel; fWg3gRI
bih.biClrImportant=0; 7S=]@*
bih.biClrUsed=0; [ryII hQ
bih.biCompression=0; E'+z.~+
bih.biHeight=btm.bmHeight; QRdtr
bih.biPlanes=1; z:Ru`
bih.biSize=sizeof(BITMAPINFOHEADER); (i<\n`h1K
bih.biSizeImage=size; ZLP0SCkuR
bih.biWidth=btm.bmWidth; i-95>ff
bih.biXPelsPerMeter=0; w1F)R^tU
bih.biYPelsPerMeter=0; |t$%kpp
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [8DPZU@
static int filecount=0; - sq=|
CString name; b\NY!)B
name.Format("pict%04d.bmp",filecount++); bWCtRli}
name=m_Path+name; #'#@H
BITMAPFILEHEADER bfh; *gwo.s
bfh.bfReserved1=bfh.bfReserved2=0; X"f]
bfh.bfType=((WORD)('M'<< 8)|'B'); vvG*DGL)qL
bfh.bfSize=54+size; Kx;l a
bfh.bfOffBits=54; ~-yq,x
CFile bf; z^KBV^n
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n?^oQX}.\
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); l~1l~Gx_&n
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =jG."o
bf.WriteHuge(lpData,size); )ZZ6 (O
bf.Close(); K[V#Pj9
nCount++; D#>d+X$
} &xC5Mecb*
GlobalFreePtr(lpData); >n&+<06
if(nCount==1) nob}}w]~C
m_Number.Format("%d picture captured.",nCount); {*F8'6YQ$
else >#;>6q9_
m_Number.Format("%d pictures captured.",nCount); ` apCu
UpdateData(FALSE); 8X\":l:
} 0w2<2grQ
H7 {kl
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }mk z_P(Z
{ (
~>-6Nb 5
if(pMsg -> message == WM_KEYDOWN) @&Af[X4s
{ 9~r8$,e
if(pMsg -> wParam == VK_ESCAPE) ``h*A
return TRUE; \gir
if(pMsg -> wParam == VK_RETURN) Jjx1`S*i
return TRUE; >IS BK[=H
} @# p{,L
return CDialog::PreTranslateMessage(pMsg); c5eimA%`
} Fe 78YDx?
uH} }z !
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c`)[-
{ =#I/x=L:
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KW36nY\7
SaveBmp(); ph7]*W-
return FALSE; r;zG
} 7x$VH5jie#
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Fy^8]u*Fu
CMenu pop; f F9=zrW
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Is (
Ji
CMenu*pMenu=pop.GetSubMenu(0); phcYQqR
pMenu->SetDefaultItem(ID_EXITICON); {%Q+Pzl.
CPoint pt; 7a%)/)<D
GetCursorPos(&pt); / \k\HK8
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u>03l(X6f
if(id==ID_EXITICON) =kW7|c5Z
DeleteIcon(); 5q}7#{A
else if(id==ID_EXIT) RDu{U(!
OnCancel(); ~N+H7T.L
return FALSE; o7fJ@3B/
} Gd[:&h
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jxgs!B>
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~Y7:08
AddIcon(); ~2 J!I^J
return res; Yc>.P
} `Y<FR
mx0EEU*
void CCaptureDlg::AddIcon() 8/CK(G
{ @B>pPCowa
NOTIFYICONDATA data; GUvEOD=p
data.cbSize=sizeof(NOTIFYICONDATA); E$5A
1
CString tip; tNDv[IF
tip.LoadString(IDS_ICONTIP); srIt_Wq
data.hIcon=GetIcon(0); ^#z*
data.hWnd=GetSafeHwnd(); e6'y S81
strcpy(data.szTip,tip); ;<K#h9#*7
data.uCallbackMessage=IDM_SHELL; oMb@)7
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kfs[*ku
data.uID=98; Uj)`(}r
Shell_NotifyIcon(NIM_ADD,&data); zhC5%R &n/
ShowWindow(SW_HIDE); SGLU7*sfd
bTray=TRUE; ,D{D
QJ(B
} -j}zr yG-
f;a55%3c
void CCaptureDlg::DeleteIcon() Ob
h@d|
{ lD1m<AC
NOTIFYICONDATA data; <L<d_
data.cbSize=sizeof(NOTIFYICONDATA); 5wm(gF_t
data.hWnd=GetSafeHwnd(); 6tBe,'*
data.uID=98; /baSAoh/e
Shell_NotifyIcon(NIM_DELETE,&data); 67P@YL
ShowWindow(SW_SHOW); ~:"//%M3l
SetForegroundWindow(); KyRcZ"
ShowWindow(SW_SHOWNORMAL); /qPhptV
bTray=FALSE; ^qNr<Ye
} 9at_F'>R
I73=PfS:m
void CCaptureDlg::OnChange() 2j-^F
{ T5+9#
RegisterHotkey(); w@hbY:Z9z
} 8/ PS#dM\
JR4fJG
BOOL CCaptureDlg::RegisterHotkey() :z%q09.)
{ %1kIaYZ
UpdateData(); <2fgao&-n
UCHAR mask=0; 7NQEn Al
UCHAR key=0; a/lTQj]A
if(m_bControl) /n8\^4{fP{
mask|=4; C\gKJW^]y@
if(m_bAlt) ;^|:*
mask|=2; /zIUYY
if(m_bShift) OCbwV7q:
mask|=1; }6 MoC0
key=Key_Table[m_Key.GetCurSel()]; wp>L}!
if(bRegistered){ \~I>@SG2W+
DeleteHotkey(GetSafeHwnd(),cKey,cMask); *w23(f
bRegistered=FALSE; X~ g9TUv8
} qW|_|%{U+
cMask=mask; !4(QeV-=
cKey=key; 1R7w
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D Ax1
return bRegistered; k[5:]5lp+
} E8b:MY
aJ$({ZN\#
四、小结 jF0>wm
c4(og|ifk
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。