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:
u1X^#K$nu'
Im~DK 一、实现方法
Z4/D38_ &/UfXKr 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
&YY`XEG59O ;:bp?( #pragma data_seg("shareddata")
3&})gU&a HHOOK hHook =NULL; //钩子句柄
GxzO|vFQ UINT nHookCount =0; //挂接的程序数目
,]1f)> static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
.*`^dt static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
I4@XOwl{P static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
jr)M], static int KeyCount =0;
,1~zYL?
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
d?X,od6 #pragma data_seg()
E:8*o7 BmV`<Q, 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
8
*f9 /HRKw
D DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
>ZkL`!:s fhN\AjB6Td BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
60%nQhb cKey,UCHAR cMask)
n8Qv8 {
op`9(=DJ] BOOL bAdded=FALSE;
%}TJr]'F for(int index=0;index<MAX_KEY;index++){
E$
\l57 if(hCallWnd[index]==0){
[Ep'm hCallWnd[index]=hWnd;
NC~?4F[ HotKey[index]=cKey;
=i vlS HotKeyMask[index]=cMask;
B<EqzP*# bAdded=TRUE;
*xxk70Cb KeyCount++;
-*mbalU,J break;
129\H<
m }
.Qrpz^wdt }
H]tD~KM< return bAdded;
`\VtTS }
q!Ek
EW\n //删除热键
01o<eZ, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
OD~Q|I(j {
_3%$E.Q BOOL bRemoved=FALSE;
;7s^slVzF for(int index=0;index<MAX_KEY;index++){
_{'[Uf/l if(hCallWnd[index]==hWnd){
+m./RlQ{ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
eQuw uT hCallWnd[index]=NULL;
%mss{p!d6 HotKey[index]=0;
j.] ]VA HotKeyMask[index]=0;
P0m9($JBD bRemoved=TRUE;
%"r9;^bj&< KeyCount--;
H 0+-$s;f break;
w ?_8OJ }
w =F9> }
o;6~pw% }
YT8q0BR] return bRemoved;
:N<Qk }
|v7Je?yh Pi"?l[T0 8lx}0U DLL中的钩子函数如下:
w` +,
+H&/C1u LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
}+m4(lpl {
Ydrh+ BOOL bProcessed=FALSE;
=aB+|E if(HC_ACTION==nCode)
>/\TG8t,f {
Crc6wmp if((lParam&0xc0000000)==0xc0000000){// 有键松开
nZi&`HjQ switch(wParam)
aR3jeB,=x {
AsE77AUA case VK_MENU:
r1
:TM|5L MaskBits&=~ALTBIT;
$H+X'1 break;
^J> m4` case VK_CONTROL:
3A^AEO MaskBits&=~CTRLBIT;
kkZ}&OXS; break;
KH#z =_ case VK_SHIFT:
JfkEJk< MaskBits&=~SHIFTBIT;
~9o@1TO:v break;
_5S0A0 default: //judge the key and send message
i45.2, break;
\\ItN }
})]
iN" for(int index=0;index<MAX_KEY;index++){
g5+m]3#t if(hCallWnd[index]==NULL)
+i}H $.
continue;
a^LckHPI> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZB1%Kn#zo4 {
%' WC7s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qery|0W bProcessed=TRUE;
Vf:.C|Z }
1p~ORQ }
qnyacI }
nmn/4> else if((lParam&0xc000ffff)==1){ //有键按下
v`mB82s switch(wParam)
Q0"?TSY {
Mhn1-ma: case VK_MENU:
@$kO7k0{g MaskBits|=ALTBIT;
%0y-f break;
Lbo3fwW case VK_CONTROL:
T"htWo{v> MaskBits|=CTRLBIT;
JZ`u?ZaJ/s break;
i
Ehc< case VK_SHIFT:
[ p,]/ ^ N MaskBits|=SHIFTBIT;
|e!Y
C iU break;
#tg\
bb default: //judge the key and send message
OMk3\FV2Z break;
^|oI^"IQ= }
afHRy:<+% for(int index=0;index<MAX_KEY;index++){
rr,A Vw if(hCallWnd[index]==NULL)
.s4vJKK0 continue;
.B xQF if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6, j60`f) {
kVZs: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Qa/1*Mb bProcessed=TRUE;
Da)p%E>Q }
#@-dT,t }
$W}:,]hoj }
;g8v7>p if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
:4[>]&:u3 for(int index=0;index<MAX_KEY;index++){
{.oz^~zs]g if(hCallWnd[index]==NULL)
>!Y#2]@}o continue;
^7>~y( if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!otseI!!/ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
PdVY tK% //lParam的意义可看MSDN中WM_KEYDOWN部分
M*n94L=Sg& }
;\}dQsX }
}>AA[ba"' }
|8{ k,!P'K return CallNextHookEx( hHook, nCode, wParam, lParam );
HABUf^~- }
LsI@_,XW< + R6X 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
CB9:53zK9 =#4>c8MM BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%x,HQNRDU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1O,5bi>t7 VFawASwQ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
FT>>XP8 2V;{@k LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%w>3Fwj`z {
Iu0GOy*[ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Zc38ht\r; {
G"3KYBN> //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
\nyqW4nTm SaveBmp();
2sgp$r return FALSE;
lAG@nh^ }
zk3\v
" …… //其它处理及默认处理
28M^F~0 }
4 5wqX h _~tF2`,Y_p dpchZ{ 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。
416}# Mk Pbbi*&i 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。
=3% GLj ?`Mk$Y%my 二、编程步骤
|Wck-+}U ^GYVRD 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";
POc<XLZB c1i[1x% 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?z|Bf@TJ[+ x ]}'H 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;
I m-M2n <]z4;~/& 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;
L Y4bn)Qf $s
,g&7*- 5、 添加代码,编译运行程序。
si~zg\uY Ui"$A/ 三、程序代码
.PT7 F@ |( ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
HD{u#~8{ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
3&E@#I^], #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
.
WJ #if _MSC_VER > 1000
jR:\D_: #pragma once
R$IsP,Uw #endif // _MSC_VER > 1000
^h=gaNL #ifndef __AFXWIN_H__
{=Ji2k0U' #error include 'stdafx.h' before including this file for PCH
/EQ^-4yr #endif
!"/"Mqs3$ #include "resource.h" // main symbols
8z|]{XW{ class CHookApp : public CWinApp
OcpvY~"Pr {
-/B*\X[ public:
&)Zv>P8z` CHookApp();
m@I}$ // Overrides
;D-k\kv // ClassWizard generated virtual function overrides
Omn$O> //{{AFX_VIRTUAL(CHookApp)
3HR)H-@6@7 public:
+3AX1o%p,# virtual BOOL InitInstance();
8kd):gZKZ virtual int ExitInstance();
HnFH|H<Uf //}}AFX_VIRTUAL
Q A~F
//{{AFX_MSG(CHookApp)
=],c$) // NOTE - the ClassWizard will add and remove member functions here.
Z
s|*+[ // DO NOT EDIT what you see in these blocks of generated code !
]C+PJ:CC //}}AFX_MSG
kuLur)^ DECLARE_MESSAGE_MAP()
h)W# };
5i{J0/'Xu) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
sm[zE/2b BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
@o}J ) BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
<o|k'Y(- BOOL InitHotkey();
YsiH=x BOOL UnInit();
dKXzFyW #endif
%RwWyzm#\ ow`F 7 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
xi<}n# #include "stdafx.h"
WSU/Z[\`H #include "hook.h"
c;t3I}, #include <windowsx.h>
pwSkw J] #ifdef _DEBUG
{#@[ttw$U #define new DEBUG_NEW
Yc)Dx3 #undef THIS_FILE
&{wRB l # static char THIS_FILE[] = __FILE__;
Ln+ .$ C #endif
S+eu3nMq #define MAX_KEY 100
d'Dd66 #define CTRLBIT 0x04
f2KH&j>~r #define ALTBIT 0x02
l.;^w #define SHIFTBIT 0x01
Q>\DM'{:4 #pragma data_seg("shareddata")
OFcP4hDi HHOOK hHook =NULL;
d7&d
FvG UINT nHookCount =0;
Ps0<CUyI static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
e8_EB/)_Z static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
M
$EHx[*5 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
HpeU'0u0VK static int KeyCount =0;
kDR5kDiS static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
y fuH #pragma data_seg()
&0ymAf5R HINSTANCE hins;
y'oH>l+n void VerifyWindow();
0&kmP ' BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
/{[tU-}qJ //{{AFX_MSG_MAP(CHookApp)
m>w{vqPwJ // NOTE - the ClassWizard will add and remove mapping macros here.
I+^iOa // DO NOT EDIT what you see in these blocks of generated code!
3T 0'zJ2f //}}AFX_MSG_MAP
=kOo( END_MESSAGE_MAP()
>*^SQ{9 Z;R/!Py. CHookApp::CHookApp()
VggSDb {
J5f}-W@ // TODO: add construction code here,
0;w 4WJJ // Place all significant initialization in InitInstance
siV]NI':| }
hDoFF8)c PF)s> CHookApp theApp;
7''iT{-[p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
c&<Ei1 {
BG4TUt BOOL bProcessed=FALSE;
l\m7~ if(HC_ACTION==nCode)
vy-(:aH7U {
K1;b4Sl?A if((lParam&0xc0000000)==0xc0000000){// Key up
}U}ppq0Eo switch(wParam)
0E3;f;'X {
WkpHe case VK_MENU:
)#? K2E MaskBits&=~ALTBIT;
bVZAf break;
Crla~h?= case VK_CONTROL:
VS~+W=5} MaskBits&=~CTRLBIT;
d,'gh4C break;
4]
u\5K- case VK_SHIFT:
x],XiSyp MaskBits&=~SHIFTBIT;
BoARM{m break;
*
+6Z^7 default: //judge the key and send message
k0b6X5 break;
lEQj62zIQ }
}-Nc}%5 for(int index=0;index<MAX_KEY;index++){
i\4YT r, if(hCallWnd[index]==NULL)
X
VH(zJ continue;
FId,/la if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
VYH
$em6 {
:yw(Co]f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
79jnYjk bProcessed=TRUE;
^`$-c9M?' }
BuitM|k' }
y<BG- }
Xoq - else if((lParam&0xc000ffff)==1){ //Key down
Smh=Q4,W switch(wParam)
$p}q,f. {
E;k$ICOXA case VK_MENU:
%w!x \U V MaskBits|=ALTBIT;
G8Ow;:Ro
break;
r'*#i>PkQD case VK_CONTROL:
Oo~
MaskBits|=CTRLBIT;
[*H h6 break;
#2*R0_b case VK_SHIFT:
/p}pdXS MaskBits|=SHIFTBIT;
Wrm3U/>e break;
:hf%6N='kI default: //judge the key and send message
l['ER$(7 break;
OSh'b$Z }
v>j<ky for(int index=0;index<MAX_KEY;index++)
iDsY5l {
G}dq
ft5" if(hCallWnd[index]==NULL)
&pv*TL8 continue;
Hr}\-$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{uqP+Cs {
Pvm pWa SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
dD
6jMl bProcessed=TRUE;
aOUTKyR ~ }
*iSE)[W }
g`6I, 6G }
.F\[AD 5 if(!bProcessed){
z4]z3U<}3] for(int index=0;index<MAX_KEY;index++){
AZ\f6r{
if(hCallWnd[index]==NULL)
J'wJe, continue;
$9G".T if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
d]?fL&jr SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
W yP] ]I. }
zTn.#-7y }
SEM-t }
Pn?gB}l return CallNextHookEx( hHook, nCode, wParam, lParam );
}JUc!cH8z }
{s2eOL5I|% I3ugBLxVC3 BOOL InitHotkey()
ki?V
eFp {
!|J2o8g if(hHook!=NULL){
raMtTL+ nHookCount++;
4Le{|B return TRUE;
)~w
bu2; }
)L"J?wTe else
qE6D"+1y7 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Z|3[Y@c\ if(hHook!=NULL)
{JfL7% nHookCount++;
zUWWXC%R return (hHook!=NULL);
YTfi g{a }
2H~E~6G BOOL UnInit()
&o`LT|*m {
P (fWJVF7 if(nHookCount>1){
@G|z_ nHookCount--;
8K\S]SZ return TRUE;
E6?0/" }
a{.-qp BOOL unhooked = UnhookWindowsHookEx(hHook);
)<5hga][~a if(unhooked==TRUE){
0/~{, nHookCount=0;
oSO~72 hHook=NULL;
;_/!F}d }
WjvgDNk return unhooked;
HoZsDs.XZ }
x*:"G'zT 3_J({ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<.lt?!.ZH {
:4Y5 BOOL bAdded=FALSE;
h~Z:YY)4 for(int index=0;index<MAX_KEY;index++){
^jk-GRD* if(hCallWnd[index]==0){
rFW,x_*_vP hCallWnd[index]=hWnd;
kr44@!s+' HotKey[index]=cKey;
FJsM3|{2=d HotKeyMask[index]=cMask;
UQBc$`v bAdded=TRUE;
{@ tO9pc`8 KeyCount++;
t+Qx-sW break;
;"NW=P& }
* YLpC^& }
d(, M return bAdded;
cfc=a }
ypTH=]y Rvj[Csgi BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
T7(U6yN {
iu`B8yI BOOL bRemoved=FALSE;
T^2o'_: for(int index=0;index<MAX_KEY;index++){
q9nQ/]rkHF if(hCallWnd[index]==hWnd){
{t('`z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
oe=W}y_k hCallWnd[index]=NULL;
VexQ ] HotKey[index]=0;
(%4O\s#l HotKeyMask[index]=0;
VE^IA\J x bRemoved=TRUE;
r
<2&_$| KeyCount--;
]OC?g2&6 break;
O7f"8|=HX }
07vzVsQ}p }
?|GwuG8g }
M1K[6V! return bRemoved;
=BeJ.8$@VC }
6PLdzZ{ 6+SaO
!lR void VerifyWindow()
e#ne 5 {
1@q"rPE^ for(int i=0;i<MAX_KEY;i++){
fs,>X!l+ if(hCallWnd
!=NULL){ zy8D&7Ytf
if(!IsWindow(hCallWnd)){ N1dM,H
hCallWnd=NULL; E$4Ik.k
HotKey=0; wqJ1^>TB
HotKeyMask=0; '.XR,\g>
KeyCount--; wHs4~"EY9
} R1Q~UX]d=
} or[! C%
} 2'}/aL|G
} 41i#w;ojI
z[]8"C=
BOOL CHookApp::InitInstance() 3o_@3-Y%
{ [h0)V(1KR
AFX_MANAGE_STATE(AfxGetStaticModuleState()); n-CFB:L
hins=AfxGetInstanceHandle(); /,+&O#SX
InitHotkey(); |bk$VT4\
return CWinApp::InitInstance(); =qww|B92
}
YS>VQl
&[[Hfs2:-]
int CHookApp::ExitInstance() r@G34QC+
{ 4z^VwKH\ j
VerifyWindow(); fczH^+mI
UnInit(); !PEP`wEKdp
return CWinApp::ExitInstance(); e @|uG %
} -D
wO*f
Ots] y
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S\6.vw!'
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \WM"VT
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +VO(6Jn
#if _MSC_VER > 1000 F2',3
#pragma once vgKdhN2kI
#endif // _MSC_VER > 1000 >2#F5c67
v<gve<]
class CCaptureDlg : public CDialog x#'v}(v
{ G@,XUP
// Construction =u.hHkx
public: Wtp;se@#
BOOL bTray; W<Asr@
BOOL bRegistered; +wm%`N;v<
BOOL RegisterHotkey(); =gO4B-[
UCHAR cKey; 1*OZu.NdK
UCHAR cMask; A7aW]
void DeleteIcon(); ]J.|XRp/
void AddIcon(); B{7hRk.5!
UINT nCount; W>E|Iv[o
void SaveBmp(); *;~i\M9_
CCaptureDlg(CWnd* pParent = NULL); // standard constructor |GP1[Q{
// Dialog Data #M[%JTTn
//{{AFX_DATA(CCaptureDlg) !Gh*Vtd8-
enum { IDD = IDD_CAPTURE_DIALOG }; f+4j ^y}
CComboBox m_Key; )/BbASO$)Z
BOOL m_bControl; Ji0FHa_
BOOL m_bAlt; u9R@rQ9r
BOOL m_bShift; KH9D},
CString m_Path; OTWp,$YA=
CString m_Number; @}_Wl<kn
//}}AFX_DATA Z':w
X
// ClassWizard generated virtual function overrides %kV #UzL
//{{AFX_VIRTUAL(CCaptureDlg) 4X$|jGQ\
public: _{?-=<V'_
virtual BOOL PreTranslateMessage(MSG* pMsg); m 8P`n
protected: ;~n^/D2.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :E2 ww`
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2@|,VN V6~
//}}AFX_VIRTUAL v=E(U4v9e
// Implementation ?GeMD
/]
protected: {w<"jw&2
HICON m_hIcon; F;Bq[V)R
// Generated message map functions SH6T\}X:
//{{AFX_MSG(CCaptureDlg) i:
VMCNH
virtual BOOL OnInitDialog(); VB}^&{t)!
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `4a9<bG
afx_msg void OnPaint(); v}Kj+9h
afx_msg HCURSOR OnQueryDragIcon(); dg@'5.ApPu
virtual void OnCancel(); Ypx"<CKP}
afx_msg void OnAbout(); 4.q^r]m*
afx_msg void OnBrowse(); *+j r? |
afx_msg void OnChange(); noO#o+
Jg#
//}}AFX_MSG )^j62uv
DECLARE_MESSAGE_MAP() >ui;B$=
}; 4ms"mIt
#endif o}y(T07n
oGz5ZDa#
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Pk&sY'
#include "stdafx.h" .hK:-q,
#include "Capture.h" |}wT/3>\
#include "CaptureDlg.h" vg*~t3{ L
#include <windowsx.h> yG,uD!N]|
#pragma comment(lib,"hook.lib") F<Ig(Wl#az
#ifdef _DEBUG F_nXsKem
#define new DEBUG_NEW y*#+:D]o*
#undef THIS_FILE mIv}%hD
static char THIS_FILE[] = __FILE__; wfQImCZ>l
#endif y`8jz,&.
#define IDM_SHELL WM_USER+1 mtVoA8(6
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h<bCm`qj
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j-7aJj%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8_T9[]7V8
class CAboutDlg : public CDialog F+<Z%KuCu
{ > QG@P
public: pLtK :Z
CAboutDlg(); O-qpB;|
// Dialog Data fY!9i5@'
//{{AFX_DATA(CAboutDlg) nt*K@
enum { IDD = IDD_ABOUTBOX }; `a9iq>
//}}AFX_DATA +w8$-eFY
// ClassWizard generated virtual function overrides n {..Q,z
//{{AFX_VIRTUAL(CAboutDlg) tiF-lq
protected: %;b] k
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?{wD%58^oG
//}}AFX_VIRTUAL ?vmoRX
// Implementation ;e6-*
protected: __`6 W1
//{{AFX_MSG(CAboutDlg) 5>aK4: S/
//}}AFX_MSG deCi\n
DECLARE_MESSAGE_MAP() EAK[2?CY
}; !k!1h%7q
F[]6U/g n
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5'n$aFqI
{ VI?kbqjo
//{{AFX_DATA_INIT(CAboutDlg) Fmzkbt~oe
//}}AFX_DATA_INIT {pC$jd>T
} O6Y1*XTmH6
TEi1,yc
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?b\oM
v5y
{ Z=(Tq1t
CDialog::DoDataExchange(pDX); q I*7ToBJ
//{{AFX_DATA_MAP(CAboutDlg) 0N_u6*@
//}}AFX_DATA_MAP ku
GaOO
} =4gPoS
|2Uw8M7.E
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3e)$ <e
//{{AFX_MSG_MAP(CAboutDlg) {2U3
// No message handlers )oy+-1dE
//}}AFX_MSG_MAP y-mjfW`n
END_MESSAGE_MAP() >{>X.I~
SZ~lCdWad
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;KT/;I
: CDialog(CCaptureDlg::IDD, pParent) 8LUl@!4b
{ JV?d/[u,
//{{AFX_DATA_INIT(CCaptureDlg) ':]Hj8t_
m_bControl = FALSE; M"yOWD~s~
m_bAlt = FALSE; XC4wm#R
m_bShift = FALSE; GIhFOK
m_Path = _T("c:\\"); 'u6n,yRm
m_Number = _T("0 picture captured."); a&u!KAQ
nCount=0; %uvA3N>
bRegistered=FALSE; B(Er/\-@U
bTray=FALSE; HJt
'@t=Ak
//}}AFX_DATA_INIT 6xx(o
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 }H|'W[Q.
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F12$BKDH
} |qpFR)l
.TNGiUzG
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) lLLPvW[Q
{ WG
+]
CDialog::DoDataExchange(pDX); ~bz$] o-<
//{{AFX_DATA_MAP(CCaptureDlg) 9K-,#a
DDX_Control(pDX, IDC_KEY, m_Key); uobQS!
DDX_Check(pDX, IDC_CONTROL, m_bControl); vb3hDy
DDX_Check(pDX, IDC_ALT, m_bAlt); ?0+N
DDX_Check(pDX, IDC_SHIFT, m_bShift); svtqX-Vj"
DDX_Text(pDX, IDC_PATH, m_Path); ?%$~Bb _
DDX_Text(pDX, IDC_NUMBER, m_Number); Q+s2S>U{v
//}}AFX_DATA_MAP AOef1^S=
} ~vcua@
ahFK^ #s
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <MoyL1=
//{{AFX_MSG_MAP(CCaptureDlg) ijKQ`}JA
ON_WM_SYSCOMMAND() dtig_s,)D
ON_WM_PAINT() LQV&;O4'
ON_WM_QUERYDRAGICON() M"6J"s
ON_BN_CLICKED(ID_ABOUT, OnAbout) O)D$UG\<
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Xh }G=1}
ON_BN_CLICKED(ID_CHANGE, OnChange) 6VLo4bq 5
//}}AFX_MSG_MAP *'@sm*
END_MESSAGE_MAP() QwL*A `@
yatZAl(B
BOOL CCaptureDlg::OnInitDialog() M5 ^qc
{ Nw1Bn~yx<R
CDialog::OnInitDialog(); 3AAciMq}
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `nY.&YT
ASSERT(IDM_ABOUTBOX < 0xF000); >X*Y jv:r
CMenu* pSysMenu = GetSystemMenu(FALSE); \{v-Xe&d^
if (pSysMenu != NULL) lv+:
`
{ uZ'(fnZ$
CString strAboutMenu; ^DVryeLD
strAboutMenu.LoadString(IDS_ABOUTBOX); e$E>6Ngsr
if (!strAboutMenu.IsEmpty()) jwSPLq%
{ ,.0B0Y-X
pSysMenu->AppendMenu(MF_SEPARATOR); D;[%*q*
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tToP7q^
}
\UZ7_\
} @76I8r5l
SetIcon(m_hIcon, TRUE); // Set big icon zx@L sp
SetIcon(m_hIcon, FALSE); // Set small icon $i1:--~2\
m_Key.SetCurSel(0); Z+=-)&L
RegisterHotkey(); $:&b5=i
CMenu* pMenu=GetSystemMenu(FALSE); ElK Md
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4'Ya-xx
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s\p 1EL(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _%#Uh#7P$
return TRUE; // return TRUE unless you set the focus to a control NMUF)ksjN
} [3x},KM
i*@ZIw
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %,e,KcP'
{ _7~q|
if ((nID & 0xFFF0) == IDM_ABOUTBOX) x=kJlGT
{ z m]R76
CAboutDlg dlgAbout; {a15s6'd
dlgAbout.DoModal(); 3#y`6e=5
} [z!pm-Ir
else =Aw`0
{ kSEgq<i!
CDialog::OnSysCommand(nID, lParam); 4p%^?L?
} ')/w+|F
} 6OqF-nso[E
VF g(:
void CCaptureDlg::OnPaint() .[Qi4jm>`
{ \fp'=&tp~a
if (IsIconic()) cp0yr:~
{ ~(B%E'
CPaintDC dc(this); // device context for painting "=LeHY=9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); KtArV
// Center icon in client rectangle HZ1 nuA
int cxIcon = GetSystemMetrics(SM_CXICON); MhJA8|B6|
int cyIcon = GetSystemMetrics(SM_CYICON); 5sNN:m
CRect rect; "c.-`1,t
GetClientRect(&rect); |~&cTDd
int x = (rect.Width() - cxIcon + 1) / 2; hBVm;`
int y = (rect.Height() - cyIcon + 1) / 2; \S&OAe/b
// Draw the icon %(]B1Zg6,
dc.DrawIcon(x, y, m_hIcon); ?bg
/%o
} zKp R:F
else F{rC{5@fj
{ *9aI\#}
CDialog::OnPaint(); <$d2m6 J
} vP=H 2P
} yr?X.Np
?*ZQ:jH
HCURSOR CCaptureDlg::OnQueryDragIcon() $4qM\3x0,
{ reM~q-M~o@
return (HCURSOR) m_hIcon; OR37
} V]m}xZ'?^
s_^N=3Si
void CCaptureDlg::OnCancel() %@|)&][hO
{ kUfb B#.5L
if(bTray) @Ae&1O;Zh
DeleteIcon(); oOaLD{g>
CDialog::OnCancel(); ^bfU>02Q6p
} 4wGBB{X
Cl3L)
void CCaptureDlg::OnAbout() Br.UN~q
{
V<?0(esgR
CAboutDlg dlg; |WSpWsr,
dlg.DoModal(); kD7'BP/#
} |_QpB?b
5NhAb$q2Y
void CCaptureDlg::OnBrowse() qq3/K9 #y
{ ?%#no{9
CString str; ]&9=f#k%
BROWSEINFO bi; R%q:].
char name[MAX_PATH]; ] SLeWs
ZeroMemory(&bi,sizeof(BROWSEINFO)); AEDBr <
bi.hwndOwner=GetSafeHwnd(); 6y57m;JW/
bi.pszDisplayName=name; (ti!Y"e2
bi.lpszTitle="Select folder"; o*2Mjd]r
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9U4[o<G]=
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z9q4W:jyS
if(idl==NULL) IKaW],sr#
return; S%B56|'
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C' {B
str.ReleaseBuffer(); ynZEJKo
m_Path=str; E7hs+Mh
if(str.GetAt(str.GetLength()-1)!='\\') U<>@)0~7g!
m_Path+="\\"; ZS=;)
UpdateData(FALSE); q&_\A0
} @&%/<|4P5
:UAcS^n7h"
void CCaptureDlg::SaveBmp() />pAZa
{ k\9kOZW
CDC dc; .o,-a >jL
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2v;&`04V<
CBitmap bm; Bj9FSKiH
int Width=GetSystemMetrics(SM_CXSCREEN); _HjB'XNr(
int Height=GetSystemMetrics(SM_CYSCREEN); SuNc&e#(
bm.CreateCompatibleBitmap(&dc,Width,Height); _MuzD&^qE
CDC tdc; uXvE>VpJG
tdc.CreateCompatibleDC(&dc); GN=8;Kq%
CBitmap*pOld=tdc.SelectObject(&bm); J!G92A~*]
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &4#%xg
tdc.SelectObject(pOld); MgN;[4|[h
BITMAP btm; z`I%3U5(
bm.GetBitmap(&btm); G2 V$8lh
DWORD size=btm.bmWidthBytes*btm.bmHeight; i)$+#N
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P}( c0/
BITMAPINFOHEADER bih; a=x&sz\x
bih.biBitCount=btm.bmBitsPixel; '.8eLN
bih.biClrImportant=0; 1?3+>
bih.biClrUsed=0; #W
l^!)#j?
bih.biCompression=0; %_CL/H
bih.biHeight=btm.bmHeight; ]YfG`0eK<
bih.biPlanes=1; M?Q\
Hw
bih.biSize=sizeof(BITMAPINFOHEADER); #$L/pRC
bih.biSizeImage=size; O1\25D
bih.biWidth=btm.bmWidth; 0NU3%
4?
bih.biXPelsPerMeter=0; qm'@o -[
bih.biYPelsPerMeter=0; X+<9-]=
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9`5.0**
static int filecount=0; Ktvs*.?
CString name; 6}0_o[23
name.Format("pict%04d.bmp",filecount++); e=IbEm{|
name=m_Path+name; )"|wWu
BITMAPFILEHEADER bfh; CdcBE.%<
bfh.bfReserved1=bfh.bfReserved2=0; p]?eIovi
bfh.bfType=((WORD)('M'<< 8)|'B'); zf5%|7o
bfh.bfSize=54+size; ZCb@!V}=
bfh.bfOffBits=54; W<[7LdAB
CFile bf;
j0O1??
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /L2n
~/
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mo=@Zt
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <7B;_3/
bf.WriteHuge(lpData,size); /R?*i@rvf
bf.Close(); G&MO(r}B
nCount++; Z![#Uz.z
} 3-n&&<
GlobalFreePtr(lpData); \$t{K
if(nCount==1) NwQ$gDgu t
m_Number.Format("%d picture captured.",nCount); 3UZ_1nY
else 4`cf FowK~
m_Number.Format("%d pictures captured.",nCount); {ehYE ^%N
UpdateData(FALSE); NNTrH\SU#
} t\!5$P
RZSEcRlN
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) iEy2z+/"^
{ J
p%J02
if(pMsg -> message == WM_KEYDOWN) UYQ@ub
{ /k^j'MMQs6
if(pMsg -> wParam == VK_ESCAPE) 6z/&j} (
return TRUE; i=M[$
if(pMsg -> wParam == VK_RETURN) f(K1,L:&7
return TRUE; ;ByCtVm2
} #q9BU:
return CDialog::PreTranslateMessage(pMsg); E%stFyr9`/
} sk0/3X*Q%
vp d!|/
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gu'+kw
{ 7)Tix7:9S;
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |8x_Av0
SaveBmp(); i12G\Ye
return FALSE; j.+,c#hFo
} IBNb!mPu%
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ CUjRz5L
CMenu pop; 4"{g{8
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); //Xz
CMenu*pMenu=pop.GetSubMenu(0); v]KPA.W
pMenu->SetDefaultItem(ID_EXITICON); YY'[PXP$Y
CPoint pt; 73tjDO7d
GetCursorPos(&pt); d)XT> &
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r8FAV9A
if(id==ID_EXITICON) ^<v.=7cL0
DeleteIcon();
60f%J1u
else if(id==ID_EXIT) eU-A_5
OnCancel(); FgPmQ
return FALSE; zx"0^r}
} |BGzdBm^x:
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [`KQ\4u
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) XoMgbDC
AddIcon(); =U:]x'g(
return res; CaoQPb*
} &;GoCU Le
S=~+e{
void CCaptureDlg::AddIcon() ~wGjr7Wt
{ /\1Q
:B3W
NOTIFYICONDATA data; "e29j'u!*
data.cbSize=sizeof(NOTIFYICONDATA); OU mZ|
CString tip; 0{?%"t\/f
tip.LoadString(IDS_ICONTIP); +OB&PE
data.hIcon=GetIcon(0); Q-U,1b
data.hWnd=GetSafeHwnd(); gKIN* Od
strcpy(data.szTip,tip); ~IQjQz?
data.uCallbackMessage=IDM_SHELL; k<"N^+GSz
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =aehhs>
data.uID=98; O&">%aU1I
Shell_NotifyIcon(NIM_ADD,&data); v57Kr ,
ShowWindow(SW_HIDE); do%.KIk
bTray=TRUE; MUN:}S
} =3,Sjme
nXxnyom,
void CCaptureDlg::DeleteIcon() )%!X,
{ y G>sBc
NOTIFYICONDATA data; R/^;,.
data.cbSize=sizeof(NOTIFYICONDATA); o9v9
bL+X
data.hWnd=GetSafeHwnd(); ~i}/
data.uID=98; =)]RD%Oq
Shell_NotifyIcon(NIM_DELETE,&data); -**fT?n
ShowWindow(SW_SHOW); %]O#t<D
SetForegroundWindow(); ]7h;MR
ShowWindow(SW_SHOWNORMAL); xz,M>Ua
bTray=FALSE; dsbz\w3:
} a<V
Mh79*
I+Fr#1
void CCaptureDlg::OnChange() \}Pr!tk!
{ )9!ZkZbv_m
RegisterHotkey(); a$6pA@7}
} Io_7
Z \-
BOOL CCaptureDlg::RegisterHotkey() _g"su#
{ b|`
UpdateData(); uQWd`7
UCHAR mask=0; HlX7A1i/
UCHAR key=0; VAa;XVmB
if(m_bControl)
"M]`>eixL
mask|=4; qZSW5lC0
if(m_bAlt) $,Y?qn/
mask|=2; :/NP8$~@j
if(m_bShift) bHHR^*B
mask|=1; x1:1Jj:
key=Key_Table[m_Key.GetCurSel()]; +OUM 4y
if(bRegistered){ ZJ_P=
DeleteHotkey(GetSafeHwnd(),cKey,cMask); b55G1w
bRegistered=FALSE; yhyh\.
} )#Y:Bj7H@2
cMask=mask; P~"""3de4
cKey=key; xtp55"g
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); KV'-^\
return bRegistered; 2Xfy?U
} <^8OYnp
?Ye%k
四、小结 ]O+Nl5*
sF#t{x/sW
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。