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:
xsAF<:S\
5l)p5Bb48c 一、实现方法
ih~c(&n0 -F5U.6~`! 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:
) mv}u~ lbv, jS #pragma data_seg("shareddata")
k?xtZ,n{s HHOOK hHook =NULL; //钩子句柄
Bpk%,*$*) UINT nHookCount =0; //挂接的程序数目
_BW$?:)9 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
MX9q
)(: static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
*=;=VUu5 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
ASu9c2s static int KeyCount =0;
Pv/P<i^ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
AKAAb~{ #pragma data_seg()
0/] @#G2 yUH8 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。
?TzN?\ Y1
-cz: 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:
0!(Ii@m=N EB> RY+\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
}#yRaIp cKey,UCHAR cMask)
&Rn/c}[{ {
q5OW1% BOOL bAdded=FALSE;
.3HC*E.e for(int index=0;index<MAX_KEY;index++){
4AF"+L if(hCallWnd[index]==0){
.vT'hu
hCallWnd[index]=hWnd;
8-SVgo( HotKey[index]=cKey;
;'<K}h HotKeyMask[index]=cMask;
z1V 0WDVm bAdded=TRUE;
ZFdQZ=.' KeyCount++;
]j{S' cz break;
{b#c0>.8- }
j,G/[V }
}]n&" =Zk- return bAdded;
=6+BBD }
Z;n}*^U //删除热键
B8TI 5mZ4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
iK.MC%8? {
Dt+"E BOOL bRemoved=FALSE;
g~V{Ca;} for(int index=0;index<MAX_KEY;index++){
PN.=])7T if(hCallWnd[index]==hWnd){
U9N}6a= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
%NAz(B hCallWnd[index]=NULL;
@Sv
?Ar HotKey[index]=0;
;^
/9sLW?# HotKeyMask[index]=0;
x]{h$yI bRemoved=TRUE;
]gmf%g'C KeyCount--;
}%jb/@~ break;
FS@SC`~( }
*y0`P0V|8 }
0[hl&7 Ab@ }
I &m~ cBj< return bRemoved;
6l> G>) }
4wBCs0NIm `9wz:s QtP Y{J/Oib DLL中的钩子函数如下:
"1[N;|xa ~ R* 6w($ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Y@r#:BH) {
o 86}NqK BOOL bProcessed=FALSE;
kv'n W if(HC_ACTION==nCode)
{QhvHV {
D!X{9q}S1 if((lParam&0xc0000000)==0xc0000000){// 有键松开
-iW[cj
R`$ switch(wParam)
wLgRI$_Dm {
EG 1SIEo case VK_MENU:
c`t1:%S MaskBits&=~ALTBIT;
4 5Ql7~ break;
klx4Mvq+/@ case VK_CONTROL:
{?j|]j MaskBits&=~CTRLBIT;
H?aB8=) break;
jn+0g:l case VK_SHIFT:
"`3H0il;< MaskBits&=~SHIFTBIT;
W"2\vo) break;
yk#:.5H default: //judge the key and send message
ZRX>SyM break;
3Y s|M%N }
f5yd2wKy6 for(int index=0;index<MAX_KEY;index++){
FF/MTd}6qG if(hCallWnd[index]==NULL)
o+ tY[UX continue;
QOP*vH >J if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tq*Q|9j7VG {
_@@S,(MA SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
5Pr<%}[S^ bProcessed=TRUE;
cw^FOV*
}
tRXM8't }
[t6)M~&e:_ }
wo_FM
`@ else if((lParam&0xc000ffff)==1){ //有键按下
a;h:o>Do5 switch(wParam)
dyx4_!fO {
-(59F case VK_MENU:
j"NqNv MaskBits|=ALTBIT;
^|x{E20 break;
=_wgKXBFa case VK_CONTROL:
ioviJ7N%
O MaskBits|=CTRLBIT;
ZPMEN,Dw break;
Bf-&[ 5N} case VK_SHIFT:
oZ8SEC"] MaskBits|=SHIFTBIT;
AG9U2x break;
=*(d+[_ default: //judge the key and send message
"Srp/g]a break;
N7M^ }
)q=1<V44d for(int index=0;index<MAX_KEY;index++){
JRo{z{!O6 if(hCallWnd[index]==NULL)
V,Gt5lL&/! continue;
aI\VqOt] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-I|yi' {
tb=(L SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<<`."RY#0 bProcessed=TRUE;
RSnK`N\9jb }
/stED{j, }
`Y[zF1$kz^ }
M9N|Ql if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
7'o?'He-.2 for(int index=0;index<MAX_KEY;index++){
HD`%Ma
Yhc if(hCallWnd[index]==NULL)
\l[5U3{ continue;
yy>4`_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Uvuvr_IP SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
'shOSB //lParam的意义可看MSDN中WM_KEYDOWN部分
NH?s }
z;3}GxE-si }
xA-G&oC]<T }
{:rU5 !n return CallNextHookEx( hHook, nCode, wParam, lParam );
())|x[>JS+ }
oZ=e/\[K G>!"XK:fB 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:
J:Qp(s-N^: ^6`R:SV4Gx BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;m&f Vp BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Jsw<,uTD @9L%`=]b^ 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:
WL7:22nSHa Jne)?Gt LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
p*N+B
o {
!^N/n5eoz if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
lE`ScYG {
2AlLcfAW //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
cAL&>T SaveBmp();
m\VJ= return FALSE;
3O] e }
6znm?s@~ …… //其它处理及默认处理
bc 0|tJc }
P@Qo2zTh% F-ZD6l9O O
,DX%wk, 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。
mtF&Z\ag z1"UF4x* 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。
8CYJR/ 4o|~KX8Qz 二、编程步骤
$4L=Dg Q;Oc#
u 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";
8ZahpB {1qEN_ERx 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
YV2^eGr. 3NJ-.c@(p 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;
``O\'{o& 3$RII-}> 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;
5=
F-^ u}$U|Cw-;T 5、 添加代码,编译运行程序。
p@^2.O+ Y /wvn8~C 三、程序代码
jRBx7|ON (*2"dd ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
:q= XE$%H #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
9\"~ G) #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6HEl1FK{@ #if _MSC_VER > 1000
;or> Sh7 #pragma once
f.u{;W #endif // _MSC_VER > 1000
,%:`Ll
t]$ #ifndef __AFXWIN_H__
-Pvt+I> #error include 'stdafx.h' before including this file for PCH
{=(4 #endif
A,iXiDb3pK #include "resource.h" // main symbols
w}E?FEe. class CHookApp : public CWinApp
1] kk {
a`{'u)@ public:
;1y\!f3#V~ CHookApp();
M5q7`
}>G // Overrides
fL@[B{XMM // ClassWizard generated virtual function overrides
4ASc`w*0 //{{AFX_VIRTUAL(CHookApp)
ik]UzB public:
5n"'M&Ce virtual BOOL InitInstance();
oo qNPLa virtual int ExitInstance();
;<* VwXJR //}}AFX_VIRTUAL
-}>Q0d ) //{{AFX_MSG(CHookApp)
OU[Sm7B // NOTE - the ClassWizard will add and remove member functions here.
xE}q(.] // DO NOT EDIT what you see in these blocks of generated code !
rVO+
vhih //}}AFX_MSG
ClEtw DECLARE_MESSAGE_MAP()
B.{yf4a#L };
:jhJpm1Xq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
4RK^efnp BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%++q+pa BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
;TR.UUT BOOL InitHotkey();
a7CJ~8-1K BOOL UnInit();
^o{O5&i] #endif
w,P2_xk` :8rqTBa` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/!LfEO #include "stdafx.h"
l^SKd #include "hook.h"
`yf#(YP #include <windowsx.h>
_LS=O@s^ #ifdef _DEBUG
4}0s^>R #define new DEBUG_NEW
a]Lr<i8#% #undef THIS_FILE
0)nU[CY static char THIS_FILE[] = __FILE__;
)cvC9gt #endif
+Oxl1fDf #define MAX_KEY 100
P3:hGmk8|j #define CTRLBIT 0x04
1ptP ey #define ALTBIT 0x02
7y60-6r #define SHIFTBIT 0x01
y)=Xo7j #pragma data_seg("shareddata")
\:Nbl<9(9 HHOOK hHook =NULL;
[3\}Ca1 UINT nHookCount =0;
ul:jn]S* static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
m*(8I=]q static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
ed617J static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
5ecqJ static int KeyCount =0;
uh GL1{ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
kmuF*0Bjk #pragma data_seg()
g.veHh|;_ HINSTANCE hins;
O/FQ'o1F void VerifyWindow();
KI#hII[Q. BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
K/08F|]a //{{AFX_MSG_MAP(CHookApp)
Xf.SJ8G // NOTE - the ClassWizard will add and remove mapping macros here.
R[9[lQ'vR // DO NOT EDIT what you see in these blocks of generated code!
5` Q#2 //}}AFX_MSG_MAP
Gz
kf END_MESSAGE_MAP()
z,^baU x&7!m
CHookApp::CHookApp()
]@<O!fS {
Bq\%]2;eo{ // TODO: add construction code here,
x&kF;UC // Place all significant initialization in InitInstance
Wx^L~[l }
n0cqM}P@;! O6m}#?Ai/@ CHookApp theApp;
b>o38( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
pE`BB{[@ {
h nyZXk1| BOOL bProcessed=FALSE;
X${k if(HC_ACTION==nCode)
R@ihN?k {
mH;\z;lyK if((lParam&0xc0000000)==0xc0000000){// Key up
`i<U;?=0' switch(wParam)
tQ*5[F,fm {
QupCr/Hs case VK_MENU:
V a<L[8 MaskBits&=~ALTBIT;
`~gyq>Ik2 break;
] @IzJz"R case VK_CONTROL:
&L;0% MaskBits&=~CTRLBIT;
RU@`+6j+ break;
pvcD
61, case VK_SHIFT:
\`x$@s? MaskBits&=~SHIFTBIT;
qi$6y? break;
2r\f!m' default: //judge the key and send message
VJm).>E3k break;
uN'e~X6 }
':J[KWuV for(int index=0;index<MAX_KEY;index++){
V+DN<F- if(hCallWnd[index]==NULL)
$My%7S/3 continue;
sN;xHTY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g
}5lGz4 {
T,5]EHea SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
N5o jXX!l% bProcessed=TRUE;
P)Sw`^d }
qA5tMZ^w }
3!#d& }
6=iz@C7r else if((lParam&0xc000ffff)==1){ //Key down
f7\$rx switch(wParam)
YQ;?N66 {
wOn.m case VK_MENU:
|tyVC=${ MaskBits|=ALTBIT;
(Y:5u}*Y break;
cbNrto9 case VK_CONTROL:
6 fL=2a MaskBits|=CTRLBIT;
xa ??OT`( break;
|&3[YZY case VK_SHIFT:
{Q I"WFdGx MaskBits|=SHIFTBIT;
bF<FX_}!s! break;
8|HuxE default: //judge the key and send message
}H\wed]F/ break;
M2{{B^*$6 }
'
FF@I^O for(int index=0;index<MAX_KEY;index++)
)} tI8 {
GMr jZ if(hCallWnd[index]==NULL)
IyOb0WiEj continue;
8.bdN]zn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lEh; MJ {
3* 1cCM42 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
j!F5gP-l bProcessed=TRUE;
[}|x@
v9 }
!Qy%sY }
2h%/exeS; }
1pg&?L.MA if(!bProcessed){
**N{XxdN for(int index=0;index<MAX_KEY;index++){
">@]{e* if(hCallWnd[index]==NULL)
`O5wM\Z continue;
[RoOc)u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
C|*U)#3:F SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
s#hIzt }
&
=)HPzC }
OWx-I\: }
j]Kpwf<NS return CallNextHookEx( hHook, nCode, wParam, lParam );
{Cd Q)| }
I6S!-i u$O`
\= BOOL InitHotkey()
*c3(,Bmw {
ark~#<SqAr if(hHook!=NULL){
#rD0`[pz nHookCount++;
clV3x`z return TRUE;
db -h=L| }
W US[hx, else
H|JPqBNRh hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
TF R8 if(hHook!=NULL)
98'/yZ nHookCount++;
g0O~5.f return (hHook!=NULL);
B]iPixA6 }
piULIZ0 BOOL UnInit()
n@[_lNa4GD {
E^qJ5pr_P if(nHookCount>1){
_3~/Z{z8 nHookCount--;
qQ6rF
nA return TRUE;
@G,pM: t }
^hiIMqY_{` BOOL unhooked = UnhookWindowsHookEx(hHook);
D~P3~^ if(unhooked==TRUE){
hg4 d]R, nHookCount=0;
tpPP5C{ hHook=NULL;
RUco3fZ }
>}?jO B return unhooked;
A{NKHn>%` }
4&N#d;ErC 4}.PQ{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/Z^"[Ke {
[J{\Ke0<e1 BOOL bAdded=FALSE;
Y&wtF8 for(int index=0;index<MAX_KEY;index++){
=>3wI'I if(hCallWnd[index]==0){
#0kVhx7% hCallWnd[index]=hWnd;
,=>Ws:j HotKey[index]=cKey;
OEiu,Y|@l HotKeyMask[index]=cMask;
X(Z~oGyg bAdded=TRUE;
3V uoDmG KeyCount++;
3']a1\sy^ break;
x%_VzqR` }
_nwsIjsW }
WoV"&9y return bAdded;
}Wlm#t }
Lh@0|k c~``)N BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
f4 k {
e'I/}J BOOL bRemoved=FALSE;
(/gv
U80 for(int index=0;index<MAX_KEY;index++){
cV$an if(hCallWnd[index]==hWnd){
11VtC) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
U_Jchi,! hCallWnd[index]=NULL;
r{cmw`WA/P HotKey[index]=0;
%cO^: HotKeyMask[index]=0;
7F5v-/ bRemoved=TRUE;
f`<elWgc" KeyCount--;
2x5^kN7 break;
(n{x"rLy/ }
z`}z7e'> }
6.Jvqn }
ThvgYv--B return bRemoved;
_ sqj~|K }
&L[i"1a +$}3=n34) void VerifyWindow()
Bo,>blspw {
cslZ; for(int i=0;i<MAX_KEY;i++){
y#T.w0* if(hCallWnd
!=NULL){ r1axC%
if(!IsWindow(hCallWnd)){ tgyW:<iv
hCallWnd=NULL; fZ aTckbE
HotKey=0; _lG|t6y
HotKeyMask=0; gU&y5s~
KeyCount--; LwlO)|E
} ]z#+3DaH
} ]-j.\+(*
} oBO4a^D
} 9r.h^
PZ>(cvX&
BOOL CHookApp::InitInstance() `5Bv2wlIV
{ X L3m#zW&
AFX_MANAGE_STATE(AfxGetStaticModuleState()); yJK:4af;.
hins=AfxGetInstanceHandle(); R 7h^
@
InitHotkey(); [I?[N.v
return CWinApp::InitInstance(); G! Y
l0Zr
} ,&~-Sq)~
Ij>G7Q*d
int CHookApp::ExitInstance() )2lB
{ $l $p|
VerifyWindow(); $d-$dM?R5
UnInit(); 4^Ss\$*
return CWinApp::ExitInstance(); w/z o
} b/{$#[oP`
8NkyT_\
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3,'LW}
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) qRSoF04!R
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ N~uc%wOA
#if _MSC_VER > 1000 S zNZY&8
f
#pragma once Bs`mzA54
#endif // _MSC_VER > 1000 htT9Hrx
{'Y()p3kl
class CCaptureDlg : public CDialog ;`O9YbP#
{ [uwn\-
// Construction 5X>K#N
public: %[, R Q">v
BOOL bTray; =8vNOvA
BOOL bRegistered; ^g|j4N
BOOL RegisterHotkey(); ;hPVe_/
UCHAR cKey; %iB,hGatE
UCHAR cMask; NCdDG
void DeleteIcon(); -%Rw2@vU
void AddIcon(); v#lrF\G5
UINT nCount; ZZw2m@T>
void SaveBmp(); fH@cC`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor IL`LIJ:O
// Dialog Data =xQPg0g
//{{AFX_DATA(CCaptureDlg) v%r/PHw
enum { IDD = IDD_CAPTURE_DIALOG }; O>N/6Z
CComboBox m_Key; {)iiu
BOOL m_bControl; 6j8\3H~
BOOL m_bAlt; e*}*3kw)T
BOOL m_bShift; Sp6==(:.
CString m_Path; 1s~rWnhVv
CString m_Number; u/<ZGW(&s(
//}}AFX_DATA !</U"P:L
// ClassWizard generated virtual function overrides kbL7Xjk
//{{AFX_VIRTUAL(CCaptureDlg) deQ {
public: b#
Dd
virtual BOOL PreTranslateMessage(MSG* pMsg); tPa(H;
protected: ScjeAC)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rK3KxG
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .sc80i4
//}}AFX_VIRTUAL ^W(ue]j}o
// Implementation ,A&`WE
protected: YZ]}l%e
HICON m_hIcon; RH{+8?0
// Generated message map functions p$G3<Z&7
//{{AFX_MSG(CCaptureDlg) _Ss}dU9
virtual BOOL OnInitDialog(); )Tieef*Q~
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); k.7!)jL7
afx_msg void OnPaint(); tU$n3Bg
afx_msg HCURSOR OnQueryDragIcon(); WJxcJE
virtual void OnCancel(); =jKu=!QPq
afx_msg void OnAbout(); n*ROlCxV
afx_msg void OnBrowse(); HE{UgU:tY
afx_msg void OnChange(); {sxdDl
//}}AFX_MSG )3A+Ell`
DECLARE_MESSAGE_MAP() eIy:5/s
}; C?k\5AzT
#endif amq,^
<& 3[|Ca
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [ #ih
o(/
#include "stdafx.h" fN@ZJ~F%j
#include "Capture.h" giH#t< )W
#include "CaptureDlg.h" Zn0a)VH%
#include <windowsx.h> KWeE!f 7G
#pragma comment(lib,"hook.lib") GGo~39G
#ifdef _DEBUG G)^/#d#&
#define new DEBUG_NEW skXzck
#undef THIS_FILE {0lu>?<
static char THIS_FILE[] = __FILE__; @-L\c>rqT
#endif q sUBvq
#define IDM_SHELL WM_USER+1 :{^~&jgL
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c#CV5J\Kk3
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *3P+K:2lNG
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &^K(9"
class CAboutDlg : public CDialog :Tv>)N
{ daP_Kz/2K
public: 7x77s
CAboutDlg(); P3YM4&6XA
// Dialog Data S>b
3_D
//{{AFX_DATA(CAboutDlg) |QF_E4ISD
enum { IDD = IDD_ABOUTBOX }; q"@#FS
//}}AFX_DATA
B|V!=r1%
// ClassWizard generated virtual function overrides r\#nBoo(
//{{AFX_VIRTUAL(CAboutDlg) ZXL'R|?
protected: 8(&6*-7=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yY!)2{F+
//}}AFX_VIRTUAL z R'EQ
// Implementation b%*`}B
protected: wx`.
//{{AFX_MSG(CAboutDlg) '<vb_8.
//}}AFX_MSG */JYP +
DECLARE_MESSAGE_MAP() z .\r7
}; ]b]J)dDI
CS(XN>N
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6FJ*eWPC
{ ,\X! :y~
//{{AFX_DATA_INIT(CAboutDlg) 2z"<m2a
//}}AFX_DATA_INIT q5S_B]|
}
Qe7=6<
<"6\\#}VG
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [3qH?2&
{ (]\p'%A)
CDialog::DoDataExchange(pDX); sV-PR]
//{{AFX_DATA_MAP(CAboutDlg) 63%V_B|
//}}AFX_DATA_MAP wsQ],ZE
} ,C"6@/:l
_yJz:pa
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?<BI)[B
//{{AFX_MSG_MAP(CAboutDlg) %'i_iF8.
// No message handlers Q\}-MiI/
//}}AFX_MSG_MAP QcX\z\'vg
END_MESSAGE_MAP() s3m\
|c8\alw
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +c!HXX
: CDialog(CCaptureDlg::IDD, pParent) SPRTJdaC9
{ LC##em=Y
//{{AFX_DATA_INIT(CCaptureDlg) p-_9I7?
m_bControl = FALSE; E3Y0@r
m_bAlt = FALSE; 8m=R"
%h
m_bShift = FALSE; [ `1`E1X
m_Path = _T("c:\\"); jIr\.i
m_Number = _T("0 picture captured."); kr~n5WiAZ
nCount=0; ^`iz%^
bRegistered=FALSE; R4VX*qkB
bTray=FALSE; 5@r6'Z
//}}AFX_DATA_INIT A?lR[`'u\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 AaxQBTB
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Al6%RFt
} 3u[8;1}7Q
!QvmzuK
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) T fkGkVR
{ 0SWqC@AR%
CDialog::DoDataExchange(pDX); G/FDD{y
//{{AFX_DATA_MAP(CCaptureDlg) uq-`1m}
DDX_Control(pDX, IDC_KEY, m_Key); CJCxL\
DDX_Check(pDX, IDC_CONTROL, m_bControl); WkE="E}
DDX_Check(pDX, IDC_ALT, m_bAlt); .%7Le|Fb"
DDX_Check(pDX, IDC_SHIFT, m_bShift); g(X`.0
DDX_Text(pDX, IDC_PATH, m_Path); <QFayZ$
DDX_Text(pDX, IDC_NUMBER, m_Number); +>1?ck
//}}AFX_DATA_MAP T%&vq6
} zj]
g^c;
8<T~AU8'*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) sRZ<c
//{{AFX_MSG_MAP(CCaptureDlg) F(."nUrf
ON_WM_SYSCOMMAND() T(Q ~b
ON_WM_PAINT() dmXfz D
ON_WM_QUERYDRAGICON() wT- <#+L\
ON_BN_CLICKED(ID_ABOUT, OnAbout) =H23eOS_#
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0wNlt#G;{
ON_BN_CLICKED(ID_CHANGE, OnChange) xg7KU&
//}}AFX_MSG_MAP =O"]e/CfO
END_MESSAGE_MAP() u6?9#L(
*S.FM.r
BOOL CCaptureDlg::OnInitDialog() 8@LWg d
{ 2cQ~$
CDialog::OnInitDialog(); 6lg]5d2CD
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); n{MTh_C4n
ASSERT(IDM_ABOUTBOX < 0xF000); =^rp=
Az
CMenu* pSysMenu = GetSystemMenu(FALSE); $V`1<>4
if (pSysMenu != NULL) csLbzDg
{ 1Dc6v57
CString strAboutMenu; KMkD6g
strAboutMenu.LoadString(IDS_ABOUTBOX); RD)Vb$.B:
if (!strAboutMenu.IsEmpty()) u0arJU_.)
{ ]i6*$qgma
pSysMenu->AppendMenu(MF_SEPARATOR); \ +sa[jK
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;A@DE@^5w
} F.aG7
} M_UmnqN1C
SetIcon(m_hIcon, TRUE); // Set big icon bri8o"
SetIcon(m_hIcon, FALSE); // Set small icon }riM-
m_Key.SetCurSel(0); 9M7P|Q
RegisterHotkey(); v!ai_d^
CMenu* pMenu=GetSystemMenu(FALSE); fU
;H
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c CDT27@
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |5dNJF8;Q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6Y\TVRR
return TRUE; // return TRUE unless you set the focus to a control W ).Kq-
} W?aP%D"(i
J|^XD<Y
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D6?h
6`J
{ E:/!]sm!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]nebL{}5
{ }T\.;$f
CAboutDlg dlgAbout; 2*O#m
dlgAbout.DoModal(); ^?(#%~NS
} }za pN
v
else Y7g%nz[[
{ ,4'y(X<R
CDialog::OnSysCommand(nID, lParam); ;qUB[Kw
} ;T0X7MNx
} ^&mrY[;S
H.>EO|p
void CCaptureDlg::OnPaint() vxk0@k_
{ U _A'/p^D
if (IsIconic()) vdgK3I
{ _6c/,a8;*J
CPaintDC dc(this); // device context for painting B@ufrQ#Y.
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z a_0-G%C2
// Center icon in client rectangle b+ycEs=_
int cxIcon = GetSystemMetrics(SM_CXICON); L"dN
$ A
int cyIcon = GetSystemMetrics(SM_CYICON); j}/).O
CRect rect; `W+-0F@Y?@
GetClientRect(&rect); bfncO[Q,?
int x = (rect.Width() - cxIcon + 1) / 2; `S-l.zSZ4B
int y = (rect.Height() - cyIcon + 1) / 2; hg0{x/Dgny
// Draw the icon x`C"Z7t
dc.DrawIcon(x, y, m_hIcon); _6h.<BR
} Hik=(pTu>
else oLX[!0M^
{ yl@Nyu
CDialog::OnPaint(); BxV>s+o&]
} `^^t#sT
} eXnSH$uI
HbB8A#u
HCURSOR CCaptureDlg::OnQueryDragIcon() '-N5F
{ H?Sv6W.~
return (HCURSOR) m_hIcon; <>f;g"qS
} O:rfDO
{j`8XWLZZN
void CCaptureDlg::OnCancel() L;M@]
{ s1::\&`za
if(bTray) )i:*r8*~
DeleteIcon(); O#[b NLV
CDialog::OnCancel(); | Z7j
s"
}
*JFkqbf
ZQKo ]Kdr
void CCaptureDlg::OnAbout() JM/\n4ea:
{ &0bq3JGW
CAboutDlg dlg; "HqmS
dlg.DoModal(); i4k [#x
} 03zt^<
D~i 5E9s5
void CCaptureDlg::OnBrowse() !Z\Gv1
{ 3`{
vx
CString str; rloxM~7!,)
BROWSEINFO bi; j<BRaT
char name[MAX_PATH]; GLZ*5kw
ZeroMemory(&bi,sizeof(BROWSEINFO)); NhNd+SCZ@
bi.hwndOwner=GetSafeHwnd(); y!x[N!a
bi.pszDisplayName=name; M"p%CbcI]
bi.lpszTitle="Select folder"; Pke8RLg2A
bi.ulFlags=BIF_RETURNONLYFSDIRS; oO3^9?Z
LPITEMIDLIST idl=SHBrowseForFolder(&bi); svxjad@l/
if(idl==NULL) V*2*5hx
return; {4/*2IRN9h
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?#&[1.= u
str.ReleaseBuffer(); (vD==n9Hd
m_Path=str; \P":V
if(str.GetAt(str.GetLength()-1)!='\\') `\"<%CCe
m_Path+="\\"; *}#HBZe(9
UpdateData(FALSE); [!3cWJCt
} )jUPMIo
v_U/0
0
void CCaptureDlg::SaveBmp() &XI9%h9|
{ -^`s#0( y^
CDC dc; _](y<O^9yO
dc.CreateDC("DISPLAY",NULL,NULL,NULL); b5]<!~Fv:`
CBitmap bm;
T;{}bc&I
int Width=GetSystemMetrics(SM_CXSCREEN); L.-qTh^P
int Height=GetSystemMetrics(SM_CYSCREEN); AsuugcN*
bm.CreateCompatibleBitmap(&dc,Width,Height); z(.,BB[
CDC tdc; ^["D>@yIR
tdc.CreateCompatibleDC(&dc); s.;'-oA
CBitmap*pOld=tdc.SelectObject(&bm); kxEq_FX
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N>a~k}pPH
tdc.SelectObject(pOld); ^q& Rl\
BITMAP btm; 7CF>cpw
bm.GetBitmap(&btm); ^pew'pHQ
DWORD size=btm.bmWidthBytes*btm.bmHeight; ^:ny
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `~lG5|
BITMAPINFOHEADER bih; ]:2Ro:4Yv
bih.biBitCount=btm.bmBitsPixel; . bUmT !
bih.biClrImportant=0; ZRw^<
+
bih.biClrUsed=0; kRwY#
bih.biCompression=0; bk=;=K
bih.biHeight=btm.bmHeight; dZ*&3.#D5
bih.biPlanes=1; Y$Rte.?
bih.biSize=sizeof(BITMAPINFOHEADER); ^jS1g*nrN
bih.biSizeImage=size; u^^jt(j
bih.biWidth=btm.bmWidth; `.pd %\
bih.biXPelsPerMeter=0; nwfu@h0G
bih.biYPelsPerMeter=0; 0(u}z
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d
{ P$}b
static int filecount=0; {0fQE@5@
CString name; ZR|s]'
name.Format("pict%04d.bmp",filecount++); :?z@T[-
name=m_Path+name; u-jc8W`Zd
BITMAPFILEHEADER bfh; B+R|fQ
bfh.bfReserved1=bfh.bfReserved2=0; Z]2z*XD
bfh.bfType=((WORD)('M'<< 8)|'B'); nB :i G
bfh.bfSize=54+size; {hf_Xro&
bfh.bfOffBits=54; m*)jndXY
CFile bf; JS\]|~Gd
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,+OVRc
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3rN}iSF^
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )`Qr=DIsW
bf.WriteHuge(lpData,size); Si23w'T
bf.Close(); =I&BO[d
nCount++; tp!eF"v=
} Q
(gA:aQ
GlobalFreePtr(lpData); (NfB+Ue}
if(nCount==1) g co;8e_
m_Number.Format("%d picture captured.",nCount); n,-*$~{
else Mkt_pr
m_Number.Format("%d pictures captured.",nCount); %M8Q6
UpdateData(FALSE); 6kR3[]:16v
} Dh#5-Kf%
4y5Q5)j
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S_??G:i
{ x+'Ea.^
if(pMsg -> message == WM_KEYDOWN) kDQE*o
{ l$HBYA\Qh
if(pMsg -> wParam == VK_ESCAPE) /']`}*d
return TRUE; &ns??:\+T
if(pMsg -> wParam == VK_RETURN) 9X#]Lg?b
return TRUE; [;-;{
*{G
} L9,GUtK{
return CDialog::PreTranslateMessage(pMsg);
? uP5("c
} i~<.@&vt
bh\2&]Di/
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;Tq4!w'rH
{ -<T>paE9
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +Qzl-eN/+
SaveBmp(); } 21!b :a
return FALSE; cL#zE
} QiVKaBS8
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +yk 0ez
CMenu pop; e&[~}f?
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w_QWTD0
CMenu*pMenu=pop.GetSubMenu(0); ^K~=2^sh
pMenu->SetDefaultItem(ID_EXITICON); `@6y Wb:X
CPoint pt; i"DyXIrk2
GetCursorPos(&pt); bWZzb&
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); uxW<Eh4H*
if(id==ID_EXITICON) )@.0ai
DeleteIcon(); OeQ~g-n
else if(id==ID_EXIT) j#H&~f
OnCancel(); S09Xe_q
return FALSE; ]4\6_J&
} %w3tzE1Hq
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7U&<{U<
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `]/0&S
AddIcon(); q-+_Y `_\
return res; ]^QO^{Sz
} VY!A]S"
_Vt
CC/
void CCaptureDlg::AddIcon() ^/$U(4
{ 2(9~G|C.
NOTIFYICONDATA data; 07,&weQ
data.cbSize=sizeof(NOTIFYICONDATA); "haJwV6-
CString tip; a{kLAx[>
tip.LoadString(IDS_ICONTIP); Z?."cuTt
data.hIcon=GetIcon(0); +OOmy
data.hWnd=GetSafeHwnd(); U)('}u=b
strcpy(data.szTip,tip); ofCN[u
data.uCallbackMessage=IDM_SHELL; pE G!j ~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Tx$bg(
data.uID=98; ,@8*c0Y~<!
Shell_NotifyIcon(NIM_ADD,&data); aq^OzKP?
ShowWindow(SW_HIDE); m9$lOk4/
bTray=TRUE; YE-}1&8
} {>X2\.Rl
[](] "r
void CCaptureDlg::DeleteIcon() C'joJEo
{ O F?o
NOTIFYICONDATA data; ^`9O$.'@
data.cbSize=sizeof(NOTIFYICONDATA); Gnie|[3
data.hWnd=GetSafeHwnd(); 9Om3<der
data.uID=98; 6[a;83
Shell_NotifyIcon(NIM_DELETE,&data); 90a!_8o
ShowWindow(SW_SHOW); LH q~`
SetForegroundWindow(); @u-CR8^
ShowWindow(SW_SHOWNORMAL); gt(!I^LHYc
bTray=FALSE; G mmh&Uj
} [5MV$)"!j
.JWN\\
void CCaptureDlg::OnChange() R& HkWe
{ }Q;^C
RegisterHotkey(); ByjgM`
} iz6+jHu'l
vyruUYFWe
BOOL CCaptureDlg::RegisterHotkey() xGw|@d
{ GrM`\MIO
UpdateData(); i#Z#(D
`m
UCHAR mask=0; %$+bO/f
UCHAR key=0; ]l=iKl
if(m_bControl) F%:o6mT
mask|=4; 6LzN#g
if(m_bAlt) g_(O7
mask|=2; w+{ o^O
if(m_bShift) ,+'VQa"]
mask|=1; "bvob G
key=Key_Table[m_Key.GetCurSel()]; kO v37c'
if(bRegistered){ l +#FoN
DeleteHotkey(GetSafeHwnd(),cKey,cMask); W-4R;!42
bRegistered=FALSE; ?2Sm
f
} 'OsRQ)E
cMask=mask; j.SE'a_
cKey=key; ~.J{yrJ&
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); aoU5pftC
return bRegistered; $%?[f;S3,
} WTu1t]
|
=tGrHL
四、小结 j%fi*2uX
}syU(];s
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。