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:
PKZMuEEy,
a|ZJzuqo 一、实现方法
3F9 dr@I.7 lQL/I[} 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:
B$G9#G6pZ h^f?rWD:nz #pragma data_seg("shareddata")
7g4IAsoD HHOOK hHook =NULL; //钩子句柄
?NxaJ^ UINT nHookCount =0; //挂接的程序数目
Xc9NM1bp= static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
0?''v>% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
qgxGq(6K static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
*iUR1V Y static int KeyCount =0;
?s]?2>p static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
^3C%& #pragma data_seg()
$e%m=@ga RijFN.s 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
R=C+] "d*-k R DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
=.IAd<C )%q )!x BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
{3BWT cKey,UCHAR cMask)
6n^vG/.M {
dW%;Z BOOL bAdded=FALSE;
E8.1jCL>{" for(int index=0;index<MAX_KEY;index++){
o;v_vCLO if(hCallWnd[index]==0){
-+Z&O?pSH hCallWnd[index]=hWnd;
loD:4e1 HotKey[index]=cKey;
SQ`KR'E HotKeyMask[index]=cMask;
J@IF='{ bAdded=TRUE;
^x_+& KeyCount++;
RWZjD#5%Z break;
k^%F4d3z@C }
W"g@*B'| }
'kekJ.wJ; return bAdded;
8*sP }
Sr-!-eC //删除热键
T9AFL;1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8ZNwo {
X1="1{8H BOOL bRemoved=FALSE;
KS;Wr6]@(O for(int index=0;index<MAX_KEY;index++){
gFxa UrZA if(hCallWnd[index]==hWnd){
4EJ6Zy![0* if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
5Y5N hCallWnd[index]=NULL;
Zb2.o5#} HotKey[index]=0;
"9,+m$nj HotKeyMask[index]=0;
=BBqK=W.d bRemoved=TRUE;
}^PdW3O*m, KeyCount--;
2*Mu"v, break;
e9eBD }
;h4w<OqcM }
| EFbT> }
8'0KHn{# return bRemoved;
G}`Hu_ [\) }
Ekz)Nh)vGR ~GjM:* B0!W=T\ DLL中的钩子函数如下:
G:;(, IJ6&*t
wT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
t8B==% {
%M-B"#OB7 BOOL bProcessed=FALSE;
ys9MV%* if(HC_ACTION==nCode)
Es+BV+x[.c {
M!iYj+nrP if((lParam&0xc0000000)==0xc0000000){// 有键松开
(ChL$!x switch(wParam)
p"q4R2_/jh {
tH9BC5+r} case VK_MENU:
5x}OrfDU MaskBits&=~ALTBIT;
vH vwH break;
Nk shJ2 case VK_CONTROL:
%|3NCyJ*7 MaskBits&=~CTRLBIT;
z.*=3 break;
ETq~,g' case VK_SHIFT:
^4tz*i MaskBits&=~SHIFTBIT;
]|/\Sd break;
!Baq4V?KN default: //judge the key and send message
ysQ8==`38i break;
CfjVx }
~[
x} for(int index=0;index<MAX_KEY;index++){
!S[7IBk% if(hCallWnd[index]==NULL)
sme!!+Rd continue;
S)*!jI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|I=\+P}s {
)-d&XN7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
QfsTUAfR bProcessed=TRUE;
e[J0+
x#;r }
8}Su7v1 }
}P"JP[#E\ }
df!n.&\y! else if((lParam&0xc000ffff)==1){ //有键按下
X"
;ly0Mb switch(wParam)
44_CT?t< {
.p(~/MnO case VK_MENU:
=j !Ruy1 MaskBits|=ALTBIT;
.{LJ break;
I)F3sS45} case VK_CONTROL:
#zc{N"! MaskBits|=CTRLBIT;
j?P8&Fm< break;
D[R<H(( case VK_SHIFT:
xnG,1doa MaskBits|=SHIFTBIT;
3}X; WE ` break;
|%-:qk4rG default: //judge the key and send message
ue#Yh break;
r!J?Lc])8 }
*dm?,~f%< for(int index=0;index<MAX_KEY;index++){
C6(WnO{6 if(hCallWnd[index]==NULL)
(eJYv:
^ continue;
-4'yC_8t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_J`q\N
K {
pZe:U;bb SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
zq&,KZ bProcessed=TRUE;
0YVkq?1x9 }
xt"GO
b }
do(komP<\ }
\~bE|jWbj if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
'1yy&QUZq for(int index=0;index<MAX_KEY;index++){
Qd$!?h if(hCallWnd[index]==NULL)
j{u!/FD continue;
1?bX$$yl; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
: $>TeCm SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Rw\S-z/ //lParam的意义可看MSDN中WM_KEYDOWN部分
M/mUY }
:]oR x }
@q]{s+#Xf }
-l`1j6 return CallNextHookEx( hHook, nCode, wParam, lParam );
UP}5E h }
\;Ywr3 ONw;NaE, 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:
B!cg)Y?.bd fUgI*V BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
QR;E>eEq BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
'Nbae-pf O[[#\BL 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:
s`:-6{E |4s`;4c& LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
+]%d'h {
30v 3C7o= if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
uZ(j"y {
vQpR0IEf]e //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
:D'#CoBA SaveBmp();
+B#3! return FALSE;
@fWmz,Ngl }
UR&Uwa&. …… //其它处理及默认处理
c~+;P(> }
Z'~yUo= v8xNtUxN 6T5nr 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。
Cq,ox'kGl YdK]%% 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。
PDnwaK zi*2>5g 二、编程步骤
`2@t) : o(I[_oUy\ 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";
007SA6xq HV??B : 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
)MKzAAt~ ;hOrLy&O 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;
&T8prE? + fQ=G/ 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;
Tv&-n {1y-*@yU( 5、 添加代码,编译运行程序。
"gD)Uis (f 0p 三、程序代码
TB
gD"i- OwwlQp ~!J ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
EQkv&k5X #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\Om<
FH} #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6uYCU|JsU #if _MSC_VER > 1000
z Lw=* #pragma once
VR/>V7*7@ #endif // _MSC_VER > 1000
J['paHSF #ifndef __AFXWIN_H__
5CxD ys&< #error include 'stdafx.h' before including this file for PCH
=yfLqU #endif
~ (xIG #include "resource.h" // main symbols
c D+IMlT class CHookApp : public CWinApp
Mlp[xk| {
' [fo public:
VR>;{>~ CHookApp();
$^Dx4:k<2 // Overrides
3+;}2x0-F // ClassWizard generated virtual function overrides
byYdX'd. //{{AFX_VIRTUAL(CHookApp)
{@u;F2? public:
_-*Lj;^V virtual BOOL InitInstance();
BC0T[o(f8 virtual int ExitInstance();
x8sSb:N //}}AFX_VIRTUAL
(L?fYSP! //{{AFX_MSG(CHookApp)
yFT)R hN // NOTE - the ClassWizard will add and remove member functions here.
"$?f&* // DO NOT EDIT what you see in these blocks of generated code !
?#^_yd|< //}}AFX_MSG
h'x|yy]@3 DECLARE_MESSAGE_MAP()
Ch`XwLY9 };
;(Q4x"?I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
6=kA BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
D5]sf>~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Nw}y_Qf{ BOOL InitHotkey();
)DsC:cP BOOL UnInit();
E0^~i:Mk #endif
@8TD^ub h#?L6<*tm //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[Z484dS`_ #include "stdafx.h"
s#ijpc>h #include "hook.h"
9cAb\5c| #include <windowsx.h>
]&1Kz
2/ #ifdef _DEBUG
3~\mP\/4v #define new DEBUG_NEW
\iAkF`OC #undef THIS_FILE
EZz Ox(g static char THIS_FILE[] = __FILE__;
@<e+E"6 #endif
]5lp.#EB
#define MAX_KEY 100
k+2~=# #define CTRLBIT 0x04
Z&%#,0>] #define ALTBIT 0x02
w4 <FC$ #define SHIFTBIT 0x01
oBr/CW #pragma data_seg("shareddata")
vBUx)l HHOOK hHook =NULL;
2/qP:3) UINT nHookCount =0;
"#2z
'J static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
&dZ-}.
af static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
a3
<D1" static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
o~,dkV static int KeyCount =0;
sB
]~=vUP static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
kC"<4U #pragma data_seg()
Uu{I4ls6B HINSTANCE hins;
zCT Wi void VerifyWindow();
imAsE;: BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Z VuHO7' //{{AFX_MSG_MAP(CHookApp)
[K;J#0V+&L // NOTE - the ClassWizard will add and remove mapping macros here.
<Brq7:n| // DO NOT EDIT what you see in these blocks of generated code!
@gQ{*dN //}}AFX_MSG_MAP
}.Ht=E] END_MESSAGE_MAP()
|jV> ywpk\ CHookApp::CHookApp()
BEyg63= {
L,| 60* // TODO: add construction code here,
u-3A6Q // Place all significant initialization in InitInstance
}s=D,_}m }
jEsP: H(0^ S,m)yh. CHookApp theApp;
Mxn>WCPo LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
d6-a\]gF {
z iR} BOOL bProcessed=FALSE;
|BnjT*_9 if(HC_ACTION==nCode)
s_-G`xT>{ {
./LD if((lParam&0xc0000000)==0xc0000000){// Key up
>tnQuFKg] switch(wParam)
zRdL-u%(# {
);V6YE case VK_MENU:
TU{^/-l MaskBits&=~ALTBIT;
Y 9] break;
D)XF@z; case VK_CONTROL:
o ^L3Xiv MaskBits&=~CTRLBIT;
XP<wHh break;
G=!1P]M{ case VK_SHIFT:
bB'iK4 MaskBits&=~SHIFTBIT;
s@K)RhTY break;
C3Q[L}X\ default: //judge the key and send message
twU^ewO& break;
W}bed],l }
Vo<V!G{ for(int index=0;index<MAX_KEY;index++){
4bqi&h3 if(hCallWnd[index]==NULL)
Juj"cjob continue;
-l<b|`s=w. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a:Jsi= {
PI(;t9]b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qz"di~ 7 bProcessed=TRUE;
X[:Hp`_$ }
[!p>Id
}
" m<]B }
6Y0k}+j|>E else if((lParam&0xc000ffff)==1){ //Key down
&U ]L@]x switch(wParam)
xtYX}u {
fEE[huG case VK_MENU:
DcA{E8Y MaskBits|=ALTBIT;
R9nW5f
Nf break;
-hw^3Af case VK_CONTROL:
}YWLXxb; MaskBits|=CTRLBIT;
bmVksi2b break;
,\q9>cZ! case VK_SHIFT:
7{=/rbZT? MaskBits|=SHIFTBIT;
=.O8G=;DOA break;
yjlX@YXnw default: //judge the key and send message
\\XvVi:B break;
L\}o(P( }
.'JO7of for(int index=0;index<MAX_KEY;index++)
_Q,`Qn@|BD {
z^+f3-Z if(hCallWnd[index]==NULL)
U|.kAI* continue;
Ecp]fUQK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Y~#m-y {
4Ei*\: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
=mxG[zDtQ bProcessed=TRUE;
XQ]no aU }
&^Q-:Kxs8 }
>%5Ld`c:SD }
@ofivCc<% if(!bProcessed){
.6aC2A]es for(int index=0;index<MAX_KEY;index++){
n@ lf+
if(hCallWnd[index]==NULL)
3ha^NjE continue;
kx0(v1y3gT if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S[(Tpk2_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
|;e K5(| }
Aon3G }
P*Va<'{:{ }
LgXc}3 return CallNextHookEx( hHook, nCode, wParam, lParam );
-qaJ@T+J+7 }
5H#f;L\k \=PnC}7I BOOL InitHotkey()
}M-^A{C\% {
#'[4k: if(hHook!=NULL){
7{>mm$^|V nHookCount++;
9$ZQuHSw7 return TRUE;
8&<C.nKP }
\Fg%V> else
9` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
`~0)}K.F if(hHook!=NULL)
a (RTb< nHookCount++;
Hc^q_{}" return (hHook!=NULL);
l =~EweuM }
5<ZE.'O BOOL UnInit()
5r)ndW,aN {
@-=0T!/ if(nHookCount>1){
;Gixu9u' nHookCount--;
?D?_D,"C return TRUE;
@=JOAo }
ieuq9ah# BOOL unhooked = UnhookWindowsHookEx(hHook);
:bt;DJ@ if(unhooked==TRUE){
1) 7n
( nHookCount=0;
vOIK6- hHook=NULL;
Ahl-EVIr< }
4.Luy return unhooked;
-{[5P! }
R5OP=Q 8 r Q)?Bhf BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ZLm?8g6- {
%;ST7 BOOL bAdded=FALSE;
E;m]RtvH for(int index=0;index<MAX_KEY;index++){
VRden>vKN if(hCallWnd[index]==0){
DmzK* O{ hCallWnd[index]=hWnd;
mY6d+ HotKey[index]=cKey;
0?c2=Y HotKeyMask[index]=cMask;
WOBLgM,| bAdded=TRUE;
*-Y`7=^$ KeyCount++;
ZYRZ$87jZ break;
e=uElp'% }
C:z+8w t }
LB9D6,*t return bAdded;
t<=Ru*p }
zv[$N, _mSDz=!Z3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/ bm2v; {
\tR](, / BOOL bRemoved=FALSE;
h[eC i for(int index=0;index<MAX_KEY;index++){
C7PVJnY0 if(hCallWnd[index]==hWnd){
-_@zyF<G if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
iM
\3~3' hCallWnd[index]=NULL;
7\(mn$ HotKey[index]=0;
|T`ZK?B+u HotKeyMask[index]=0;
U)CGRh8%+ bRemoved=TRUE;
|w; hu] KeyCount--;
{"kEu break;
Y=G9|7*lO }
.M(')$\U }
>-S? rXO }
/wAx#[c[ return bRemoved;
Nk
JOD3>U }
o,qq*}= P}"=67$ void VerifyWindow()
hSAdD! {
oVZI([O for(int i=0;i<MAX_KEY;i++){
XotiKCk|Aq if(hCallWnd
!=NULL){ T'i^yd}*v
if(!IsWindow(hCallWnd)){ GK6/S_l%D+
hCallWnd=NULL; {*yFTP"93
HotKey=0; ws/e~ T<c
HotKeyMask=0; 69q#Zw[,,
KeyCount--; # <?igtUO
} ^Pwtu
} |ty?Ah,vb
} y~ 2C2'7
} %_P[
C}4
5r2A^<)
BOOL CHookApp::InitInstance() DtEvt+h
{ ]u5B]ZQnA
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1`sLbPW
hins=AfxGetInstanceHandle(); ztS:1\
InitHotkey(); IL0e:-@!0
return CWinApp::InitInstance(); hw5NHZ I'
} z:Y
Z]
,r5'nDV=d
int CHookApp::ExitInstance() ,|}}Ml
{ QT8GP?F
VerifyWindow(); C4[) yJ
UnInit(); c/6
return CWinApp::ExitInstance(); ;{L ~|q J
} 8_W=)w6
8(3nv[
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V><,.p8
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @5RbMf{
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )tvP|
#if _MSC_VER > 1000 :?!b\LJ2^
#pragma once ?d!*[Ke8
#endif // _MSC_VER > 1000 ?2(52?cJ
!+Fr U'^
class CCaptureDlg : public CDialog @1w[~QlV
{ z@<OR$/`L
// Construction g)Tr#
public:
<(Rbu2_
BOOL bTray; :~^_*:
BOOL bRegistered; bmzY^ %a
BOOL RegisterHotkey(); @D[tljc^
UCHAR cKey; v:F_!Q
UCHAR cMask; AAXlBY6Y-
void DeleteIcon(); fzdWM:g
void AddIcon(); eIDrN%3
UINT nCount; Xi~7pH
void SaveBmp(); ?W 6
:$
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Qx")D?u
// Dialog Data 79*f <Gr
//{{AFX_DATA(CCaptureDlg) 9 _oAs"w
enum { IDD = IDD_CAPTURE_DIALOG }; A+=K<e
CComboBox m_Key; @fQvAok
BOOL m_bControl; P#!^9)3
BOOL m_bAlt; A.9ZFFz
BOOL m_bShift; Q]{ `m
CString m_Path; i7XM7+}
CString m_Number; gbrn'NT
//}}AFX_DATA BHu%x|d
// ClassWizard generated virtual function overrides 0f5c#/7C9
//{{AFX_VIRTUAL(CCaptureDlg) %y{'p:
public: rD;R9b"J
virtual BOOL PreTranslateMessage(MSG* pMsg); Nov)'2g7G
protected: *t{^P*pc
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5O%?J-Hp
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #b
eLo J
//}}AFX_VIRTUAL <dGph
// Implementation OWys`2W
protected: 'NNfzh
HICON m_hIcon; Et! 6i7`]
// Generated message map functions OQ&'3hv{
//{{AFX_MSG(CCaptureDlg) Kh8
virtual BOOL OnInitDialog(); @tIY%;Bgk
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^)E#
c
afx_msg void OnPaint(); X \BxRgl},
afx_msg HCURSOR OnQueryDragIcon(); Xqy9D ZIn
virtual void OnCancel(); LO;?#e7
afx_msg void OnAbout(); b%QcB[k[WB
afx_msg void OnBrowse(); TCR|wi]
kW
afx_msg void OnChange(); l3xI\{jn
//}}AFX_MSG _:\zbn0\
DECLARE_MESSAGE_MAP() *.6m,QqJ(
}; der\"?_.
#endif 2b/Cs#-
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////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O)!S[5YI
#include "stdafx.h" 5c\dm
#include "Capture.h" `]=0oDG:1!
#include "CaptureDlg.h" 'Rb
tcFb
#include <windowsx.h> n52Q-6H
#pragma comment(lib,"hook.lib") 3UX6 Y]E3
#ifdef _DEBUG FN/siw(?3
#define new DEBUG_NEW Z,oCkv("n
#undef THIS_FILE I8/tD|3
static char THIS_FILE[] = __FILE__; 050V-S>s
#endif 9S|a!9J
#define IDM_SHELL WM_USER+1 []$L"?]0uk
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u]OYu
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +~V)&6Vn
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; v~A*?WU;n
class CAboutDlg : public CDialog &^7(?C'u
{ Qd/x{a8
public: 4"pU\g
CAboutDlg(); M0$_x~
// Dialog Data FR']Rj
//{{AFX_DATA(CAboutDlg) sp&gw XPG
enum { IDD = IDD_ABOUTBOX }; ]*hH.ZBY"^
//}}AFX_DATA Pj1 k?7
// ClassWizard generated virtual function overrides A">R-1R
//{{AFX_VIRTUAL(CAboutDlg) P]O=K
protected: &I:ZJuQ4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OtbPrF5
//}}AFX_VIRTUAL ^fQa whub
// Implementation CK#i 6!~r
protected: NX5$x/uz
//{{AFX_MSG(CAboutDlg) .^6yCs5~`
//}}AFX_MSG :'FCeS9
DECLARE_MESSAGE_MAP() DP-0,Gt&Xj
}; 3RF`F
i
V KxuK0{
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )nGH$Mu
{ ]v]tBVO$
//{{AFX_DATA_INIT(CAboutDlg) c#f@v45
//}}AFX_DATA_INIT x!6<7s
} CQPq5/@Y4
XE]"RD<z
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \&l@rMD3s
{ B3<sSe8L0
CDialog::DoDataExchange(pDX); ~e&O?X
//{{AFX_DATA_MAP(CAboutDlg) A&A{Thz
//}}AFX_DATA_MAP |\>Ifv%{
} 1ASoH,D/
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xf{ZwS%X
//{{AFX_MSG_MAP(CAboutDlg) CEVisKcE:
// No message handlers 8Wo!NG:V5
//}}AFX_MSG_MAP cbYQ';{
END_MESSAGE_MAP() <kk!ns I
TT no
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FKPR;H8>
: CDialog(CCaptureDlg::IDD, pParent) *I[tIO\
{ : H:Se
//{{AFX_DATA_INIT(CCaptureDlg) aU@1j;se@
m_bControl = FALSE; E
$P?%<o
m_bAlt = FALSE; ]V)*WP#a
m_bShift = FALSE; #q>\6} )
m_Path = _T("c:\\"); ^X?uAX-RP|
m_Number = _T("0 picture captured."); "lrQC`?
nCount=0; ^ FM
bRegistered=FALSE; 7?D?s!%\
bTray=FALSE; >=:^N-a
//}}AFX_DATA_INIT
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// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sm;kg=
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H@u5&
} e,r7UtjoxR
s7 sTY
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) JL>frS3M
{ 2liJ^ `
CDialog::DoDataExchange(pDX); do*aE
//{{AFX_DATA_MAP(CCaptureDlg) D &@Iuo
DDX_Control(pDX, IDC_KEY, m_Key); ?bpVdm!
DDX_Check(pDX, IDC_CONTROL, m_bControl); -:kIIK
DDX_Check(pDX, IDC_ALT, m_bAlt); J"Fp),
DDX_Check(pDX, IDC_SHIFT, m_bShift); 7<Qmpcp =
DDX_Text(pDX, IDC_PATH, m_Path); wFMw&=j
DDX_Text(pDX, IDC_NUMBER, m_Number); 4*D"*kR;
//}}AFX_DATA_MAP /2
hk 9XM
} &po!X )
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Sfa=AV7K
//{{AFX_MSG_MAP(CCaptureDlg) 1*|/N}g)
ON_WM_SYSCOMMAND() +,]VXH<y
ON_WM_PAINT() !!ma]pB,
ON_WM_QUERYDRAGICON() *Hi}FI
ON_BN_CLICKED(ID_ABOUT, OnAbout)
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ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >t<\zC|~w
ON_BN_CLICKED(ID_CHANGE, OnChange) r6R@"1/
//}}AFX_MSG_MAP c-v-UO%
END_MESSAGE_MAP()
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B=$O4nW_b
BOOL CCaptureDlg::OnInitDialog() ?20R\
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{ $7ix(WL<%
CDialog::OnInitDialog(); lD, ~%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "vT$?IoEV
ASSERT(IDM_ABOUTBOX < 0xF000); L`e19I$
CMenu* pSysMenu = GetSystemMenu(FALSE); :5.F
if (pSysMenu != NULL) l^$'6q"
{ $:\`E56\
CString strAboutMenu; 5KDCmw
strAboutMenu.LoadString(IDS_ABOUTBOX); oH!O{pQK}
if (!strAboutMenu.IsEmpty()) ,QpFVlPU
{ [qC0YM
pSysMenu->AppendMenu(MF_SEPARATOR); Nd+1r|e'
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); GKjtX?~1
} /%s:aO
} r/HCWs|
SetIcon(m_hIcon, TRUE); // Set big icon 7(oA(l1V
SetIcon(m_hIcon, FALSE); // Set small icon VX82n,'=t
m_Key.SetCurSel(0); Z1:%AqxP
RegisterHotkey(); K[
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CMenu* pMenu=GetSystemMenu(FALSE); %q~q,=H$]
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); vf$IF|
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +iFt)
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); |
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return TRUE; // return TRUE unless you set the focus to a control Aq*?Q/pV
} HsUh5;
@K+gh#
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uo J0wG.
{ ~#jiX6<I
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7Xu# |k
{ zA8@'`Id
CAboutDlg dlgAbout; wpN3-D
dlgAbout.DoModal(); fISK3t/=C
} vV*J;%MO
else fU?#^Lg
{ Lt=32SvTn
CDialog::OnSysCommand(nID, lParam); \/?J)k3H.
} =4co$oD}
} |/^S%t6*
gBi3^GxjM?
void CCaptureDlg::OnPaint() 9Li*L&B)
{ (XW'1@b
if (IsIconic()) E5@ =LS
{ xOAq!,|V
CPaintDC dc(this); // device context for painting mO]>]
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZJQFn
// Center icon in client rectangle 1}c'UEr%)
int cxIcon = GetSystemMetrics(SM_CXICON); QnD8L.Dg
int cyIcon = GetSystemMetrics(SM_CYICON); iB"ji4[z
CRect rect; abm 3q!a-
GetClientRect(&rect); Um6}h@>
int x = (rect.Width() - cxIcon + 1) / 2; lZ.lf.{F
int y = (rect.Height() - cyIcon + 1) / 2; TH'8^w f
// Draw the icon [A/2
M s
dc.DrawIcon(x, y, m_hIcon); RJzIzv99m
} kHylg{i{"
else .=TXi<8Brw
{ \20}/&
CDialog::OnPaint(); 0VSIyG_Z
} "n`z`{<n
} <<CWN(hQWO
j&_>_*.y
HCURSOR CCaptureDlg::OnQueryDragIcon() } `Ya;
{ rU&Y/
return (HCURSOR) m_hIcon; =CRptk6tS
} @R50M (@W
#`
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void CCaptureDlg::OnCancel() N+B!AK0.
{ HXSryjF?
if(bTray) "q+Z*
DeleteIcon(); |xcC'1WU
CDialog::OnCancel(); sdg2^] |
} #gO[di0WhC
c/A?-9
void CCaptureDlg::OnAbout() 05T?c{ ;
{ i79$D:PcLa
CAboutDlg dlg; S-q"'5>
dlg.DoModal(); t#|R"Q#
} CvE^t#Bok
*c[w9(fU
void CCaptureDlg::OnBrowse() R$hIgw+p[
{ ~M{/cv
CString str; ; Z7!BU
BROWSEINFO bi; h7q{i|5
char name[MAX_PATH]; !zF07.(E
ZeroMemory(&bi,sizeof(BROWSEINFO)); 5l1R")0`t_
bi.hwndOwner=GetSafeHwnd(); 7<!x:G?C
bi.pszDisplayName=name; f^B'BioW(
bi.lpszTitle="Select folder"; P>iZgv
bi.ulFlags=BIF_RETURNONLYFSDIRS; |<h}'
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ub-e! {
if(idl==NULL) SfC* ZM}<
return; ||QK)$"
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O}Pqbx&
str.ReleaseBuffer(); )5~T%_
m_Path=str; b)Da6fp
if(str.GetAt(str.GetLength()-1)!='\\') 7uL.=th'
m_Path+="\\"; SA}Dkt&,
UpdateData(FALSE); [;Lgbgt3f
} V&:x+swt
/qy6YF8;y
void CCaptureDlg::SaveBmp() m\XsU?SuX
{ ygIn6.p
CDC dc; %K|f,w=m
dc.CreateDC("DISPLAY",NULL,NULL,NULL); M' z.d
CBitmap bm; g^+p7G
int Width=GetSystemMetrics(SM_CXSCREEN); LxhS
9
int Height=GetSystemMetrics(SM_CYSCREEN); ajk}&`Wj"
bm.CreateCompatibleBitmap(&dc,Width,Height); B2Y.1mXq
CDC tdc; NL$z4m0
tdc.CreateCompatibleDC(&dc); }k-8PG =
CBitmap*pOld=tdc.SelectObject(&bm); ^rO"U[To
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1bQO:n):~
tdc.SelectObject(pOld); sED"}F)
BITMAP btm; (FApkvy
bm.GetBitmap(&btm); B._YT
DWORD size=btm.bmWidthBytes*btm.bmHeight; r/'!#7dLG-
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |{kbc0*
BITMAPINFOHEADER bih; lr~
|=}^
bih.biBitCount=btm.bmBitsPixel; "/e)v{
bih.biClrImportant=0; ,zM@)Q;9
bih.biClrUsed=0; >dJuk6J&c&
bih.biCompression=0; VqW5VLa
bih.biHeight=btm.bmHeight; ">.k 6Q
bih.biPlanes=1; :Q=y'<
bih.biSize=sizeof(BITMAPINFOHEADER); SgewAng?@o
bih.biSizeImage=size; A1+:y,wXs
bih.biWidth=btm.bmWidth; HP]5"ziA
bih.biXPelsPerMeter=0; OS@uGp=
bih.biYPelsPerMeter=0; m8{8r>6*
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N s0,Z#Z+
static int filecount=0; "ymR8y'
CString name; 5s3QN{h8
name.Format("pict%04d.bmp",filecount++); yPtE5"(o
name=m_Path+name; K*T^w3=
BITMAPFILEHEADER bfh; tW|0_m>{
bfh.bfReserved1=bfh.bfReserved2=0; /-FV1G,h
bfh.bfType=((WORD)('M'<< 8)|'B'); |Qcz5M90e
bfh.bfSize=54+size; 9&f+I@K
bfh.bfOffBits=54; T,9q~*"
CFile bf; S!u8JG1
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6WZffB{-TK
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -V6caVlg
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [%bGs1U
bf.WriteHuge(lpData,size); OgIRI8L
bf.Close(); kh.P)h'9
nCount++; XyN
" Jr
} Ez|NQ:o
GlobalFreePtr(lpData); 3#t#NW*e
if(nCount==1) fEL 9J{
m_Number.Format("%d picture captured.",nCount); d%0Gsga}
else q`r| DcN~
m_Number.Format("%d pictures captured.",nCount); <`pNdy4
UpdateData(FALSE); G$TO'Ciu:
} p% mHxYP
%p
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) b-VtQ%Q
{ 7nnF!9JOv
if(pMsg -> message == WM_KEYDOWN) K9Mz4K_
{ 2YZ>nqy
if(pMsg -> wParam == VK_ESCAPE) |D-[M_T5
return TRUE; RR[zvH} E
if(pMsg -> wParam == VK_RETURN) */IiL%g4u
return TRUE; T}^3 Re`i
} ]$L5}pE3
return CDialog::PreTranslateMessage(pMsg); (o B4*
} S=)
c7t?a
v%T'!(0j/
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a r8iuwfZ
{ gyAJ#N|
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [G$ #jUt/O
SaveBmp(); Rmmu#-{Y
return FALSE; \O "`o4
} kH hp;<
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ny7*MZ-
CMenu pop; T>%
5<P
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); hJ xL|5Uo
CMenu*pMenu=pop.GetSubMenu(0); r c[~S
pMenu->SetDefaultItem(ID_EXITICON); 9qCE{[(
CPoint pt; m_0y ]RfG
GetCursorPos(&pt); .8s-)I
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); f#:3TJV
if(id==ID_EXITICON) \:{K",2
DeleteIcon(); YOLzCnI4
else if(id==ID_EXIT) uT,i&
OnCancel(); [5L?#Y
return FALSE; 1-E6ACq
} r9{@e^Em
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -}UY2)
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8_4!Ar>2
AddIcon(); ds!nl1
return res; B;N<{Gb
} ULz<P
bC:sd2s
void CCaptureDlg::AddIcon() x @q.u3o9
{ -W^{)%4g
NOTIFYICONDATA data; >D!R)W`
data.cbSize=sizeof(NOTIFYICONDATA); ,L-/7}"VHA
CString tip; 50Gr\
tip.LoadString(IDS_ICONTIP); 7uc\AhOk6
data.hIcon=GetIcon(0); W
!j-/ql
data.hWnd=GetSafeHwnd(); yC 1OeO8{
strcpy(data.szTip,tip); {p1`[R&n#
data.uCallbackMessage=IDM_SHELL; N,qo/At}R[
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +7w5m
data.uID=98; rZdOU?U
Shell_NotifyIcon(NIM_ADD,&data); Lp:VU-S
ShowWindow(SW_HIDE); xS_;p9{E
bTray=TRUE; ' F.^ 8/>
} ;=0mL,
W;I{4ed6
void CCaptureDlg::DeleteIcon() gNP1UH4m
{ X,VI5$
NOTIFYICONDATA data; nm#23@uZ4K
data.cbSize=sizeof(NOTIFYICONDATA); WRu(F54Sk
data.hWnd=GetSafeHwnd(); bgBvzV&'8
data.uID=98; QD!NV*
Shell_NotifyIcon(NIM_DELETE,&data); 9dA+#;?
ShowWindow(SW_SHOW); <rgK}&q
SetForegroundWindow();
p*lP9[7
ShowWindow(SW_SHOWNORMAL); \u`P(fI!K%
bTray=FALSE; 69r%b7#
} HL"c yxe
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void CCaptureDlg::OnChange() -&7?!<f
{ UAXp;W`
RegisterHotkey(); 0>CG2 SRn
} [ K/l;Zd
C <:g"F:k
BOOL CCaptureDlg::RegisterHotkey() }:faHLYT
{ N}U+K
UpdateData(); QxW+|Gt._
UCHAR mask=0;
n(Nu
UCHAR key=0; |MGT8C&^!
if(m_bControl) #1$4<o#M
mask|=4; #sCR}
if(m_bAlt) ?P[:,0_
mask|=2; q-Z<.GTq
if(m_bShift) m-uXQS^@G
mask|=1; DDkN3\w
key=Key_Table[m_Key.GetCurSel()]; 1(Vv-bq$
if(bRegistered){ I= :yfW
DeleteHotkey(GetSafeHwnd(),cKey,cMask); wX)'1H):T
bRegistered=FALSE; v[uVAbfQ
} V.`hk^V,
cMask=mask; J&\Q3_vro9
cKey=key; jGo%Aase
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ! N2uJ?t
return bRegistered; aB~k8]q.
} m,+PYq
9J7yR}2-F
四、小结 %%X/gvaJ
V z
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。