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:
w6Gez~8
KTYjC\\G 一、实现方法
$6m@gW]N vyS>3(NZ 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
=cRmaD 2Pb+/1*ix #pragma data_seg("shareddata")
kk5&lak2V HHOOK hHook =NULL; //钩子句柄
?Tc|3U UINT nHookCount =0; //挂接的程序数目
rn
.qs static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
T[4xt,[a static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@7}XBg[pI static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
0d2RB^"i static int KeyCount =0;
Rir0^XqG static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
|ufT)+: #pragma data_seg()
>V8!OaY5n 6W_:w 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
g@ J F <yl@!-'J7 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
OGcdv{,P @(L}:]{@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
25Ee+&&%
cKey,UCHAR cMask)
rOOo42YW` {
yLf9cS6= BOOL bAdded=FALSE;
!RJ@;S for(int index=0;index<MAX_KEY;index++){
v8F{qT50 if(hCallWnd[index]==0){
62nmm/c hCallWnd[index]=hWnd;
}t#|+T2f HotKey[index]=cKey;
!84Lvg0& HotKeyMask[index]=cMask;
([<{RjPb bAdded=TRUE;
W?SAa7+ KeyCount++;
&'`C#-e@ break;
iZk4KX }
ajkV"~w',| }
'T^MaLK return bAdded;
Xc+YoA0Ez }
xJ<RQCW$ //删除热键
I]n X6=j5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
a;dWM(;Kw {
`'|6b5`2j BOOL bRemoved=FALSE;
rXmrT%7k for(int index=0;index<MAX_KEY;index++){
i-w<5pGnf if(hCallWnd[index]==hWnd){
V}TPt6C2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Ur 1k3 hCallWnd[index]=NULL;
^jL44?W}l HotKey[index]=0;
m\*ca3$ HotKeyMask[index]=0;
bv <^zuV bRemoved=TRUE;
H,<CR9@(5d KeyCount--;
Zz (qc5o,F break;
_*=4xmB.= }
UxMy8}w!y }
#&uajo }
c1kV}-v return bRemoved;
(XR}U6^v] }
8Y% 2FdwX,O. lq-F*r\/~+ DLL中的钩子函数如下:
o[wiQ9Tl \RDqW+, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Ho}*Bn~ic {
/T
qbl^[ BOOL bProcessed=FALSE;
7h(
if(HC_ACTION==nCode)
)+v5H {
%o/@0.w if((lParam&0xc0000000)==0xc0000000){// 有键松开
xK0;saG# switch(wParam)
[Cd#<Te3 {
RPMz&/k case VK_MENU:
8yYag[m8 MaskBits&=~ALTBIT;
qPi $kecx break;
&:C[
n q case VK_CONTROL:
L$a{%]I MaskBits&=~CTRLBIT;
u`B/ 9-K)y break;
E_30)"] case VK_SHIFT:
A##Q>|>) MaskBits&=~SHIFTBIT;
j/O9LygB break;
^{J^oZ'%~ default: //judge the key and send message
<NDV 5P break;
44n41.Q] }
ph)=:*A6& for(int index=0;index<MAX_KEY;index++){
!1S!)# if(hCallWnd[index]==NULL)
OWfB8*4@ continue;
Te!eM{_$T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fFC9:9< {
aiX4;'$x! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
V@LBy1z bProcessed=TRUE;
08@4u
L }
.rg "(I }
O>f*D+A- }
J7wwM'\ else if((lParam&0xc000ffff)==1){ //有键按下
gzK/ l: switch(wParam)
rx]Q,;" {
.@r{Tq,%q8 case VK_MENU:
H[g i`{c MaskBits|=ALTBIT;
7^)yo#i4 break;
[$$R>ELYQ case VK_CONTROL:
;E{@)X..| MaskBits|=CTRLBIT;
'M?pg$ta_V break;
U4a8z<l$ case VK_SHIFT:
} j6|+ MaskBits|=SHIFTBIT;
L#D)[v" break;
Y$^vA[]c> default: //judge the key and send message
j AoI`J break;
"AqLR }
WSF$xC/~ for(int index=0;index<MAX_KEY;index++){
= ?/6hB=7< if(hCallWnd[index]==NULL)
k,OxGG continue;
\\Zsxya1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7!o#pt7 {
ho#<?rh_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
}>f%8O} bProcessed=TRUE;
(.z0.0W }
3?gfDJfE }
|J-tU)|1vl }
$D^27q:H if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
4y.'O for(int index=0;index<MAX_KEY;index++){
Z 5wDf+ if(hCallWnd[index]==NULL)
Vl(id_~ _ continue;
b*Hk}
!qH if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[$>@f{: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,DWq //lParam的意义可看MSDN中WM_KEYDOWN部分
Rc@lGq9 }
BD.l 5~: }
:hB6-CZkqN }
LEg|R+6E return CallNextHookEx( hHook, nCode, wParam, lParam );
&RS)U72 }
^}gZ+!kA :1UOT'_ 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:
55y}t%5 $Zi{1w BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2
=>3B BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4;jAdWj3 : @gW3' 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:
e'v_eD T^ Z0~,cO8~ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
iF:NDqc {
+5GC?cW if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ncsk(`lo {
0|\JbM //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
m*e8j[w# SaveBmp();
qIy9{LF return FALSE;
925T#%y
}
5}]gL …… //其它处理及默认处理
`]&'yt }
DM,;W`|6% Q\^BOdX^` tnXW7ej ^ 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。
tuo'Uk) =xH>,-8} 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。
zyK11 tQMz1$ 二、编程步骤
A,#z_2~ dDYor-g> 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";
: T4ap_Ycq p8CaD4bE 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
1
!.PH I=E\=UTG,5 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;
nwDW<J{f|U ^sJp!hi4=) 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;
N9H qFp odvUU#l 5、 添加代码,编译运行程序。
~a>3,v- X-"0Zc 三、程序代码
-zH-9N*c VM3)L>x]/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
*:chN' < #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
"+&@iL #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
_=qk.| p/ #if _MSC_VER > 1000
nzB!0U #pragma once
{X\FS #endif // _MSC_VER > 1000
%CrpUx #ifndef __AFXWIN_H__
O4W2X@ #error include 'stdafx.h' before including this file for PCH
;[,#VtD #endif
2Aq+:ud)P #include "resource.h" // main symbols
1(VskFtZF class CHookApp : public CWinApp
z)&&Ym# {
0NSCeq%;6q public:
rsK
b9G CHookApp();
lb)i0`AN+ // Overrides
e A9r M: // ClassWizard generated virtual function overrides
pAtxEaXh //{{AFX_VIRTUAL(CHookApp)
FxX nX public:
i?F~]8 virtual BOOL InitInstance();
mndNkK5o virtual int ExitInstance();
,ce$y4%( //}}AFX_VIRTUAL
7ws[Rp8 //{{AFX_MSG(CHookApp)
B/EGaYH // NOTE - the ClassWizard will add and remove member functions here.
cn
;2& // DO NOT EDIT what you see in these blocks of generated code !
;sSRv9Xb //}}AFX_MSG
*^%ohCUi DECLARE_MESSAGE_MAP()
%G] W Oq=q };
P9# }aw+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
<
$rXQ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
WZ@$bf}f0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
][T>052v BOOL InitHotkey();
0mT.J~}1v BOOL UnInit();
qUNXT #endif
ZN`I4Ak 04E#d.o' //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
{<Vw55)#0Q #include "stdafx.h"
h`:gMhn #include "hook.h"
@%As>X<3t #include <windowsx.h>
Xu[A,6 #ifdef _DEBUG
T
"t%>g #define new DEBUG_NEW
SM`n:{N( #undef THIS_FILE
T!H }^v static char THIS_FILE[] = __FILE__;
4V5h1/JPm #endif
F)tcQO"G #define MAX_KEY 100
5lm>~J!/^ #define CTRLBIT 0x04
Ar$Am #define ALTBIT 0x02
y-:d`>b>\ #define SHIFTBIT 0x01
>uz3 O?z P #pragma data_seg("shareddata")
X
gA(
D HHOOK hHook =NULL;
l9$"zEC UINT nHookCount =0;
[Kanj/ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Y{dj~}mM+ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)!D,;,aQ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
~w$ ^`e!] static int KeyCount =0;
U#n1N7P|$F static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
;[j)g,7{ #pragma data_seg()
]A:G>K HINSTANCE hins;
AhSN'gWpbF void VerifyWindow();
&;%LTF@I, BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Y X{F$BM //{{AFX_MSG_MAP(CHookApp)
=&?BPhJE // NOTE - the ClassWizard will add and remove mapping macros here.
h Qbz}x // DO NOT EDIT what you see in these blocks of generated code!
*h"7!g //}}AFX_MSG_MAP
+@yTcz END_MESSAGE_MAP()
+zsB ~Vz Ne2eBmY}( CHookApp::CHookApp()
n]WVT@ {
vF$sVu|B // TODO: add construction code here,
V0F&a~Q // Place all significant initialization in InitInstance
~fF;GtP }
Sa$-Yf q!8aYw+c CHookApp theApp;
7a<:\F}E0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
w:[\G%yQ {
0\yA6`}! BOOL bProcessed=FALSE;
+Rd;>s*.Y if(HC_ACTION==nCode)
`9p;LZC1 K {
a.s5>:Ct if((lParam&0xc0000000)==0xc0000000){// Key up
[-JU(:Rh switch(wParam)
zM|Y
X< {
C.9l${QU case VK_MENU:
QetyuhS~ MaskBits&=~ALTBIT;
Gmh6|Dsg break;
2lRE+_qz case VK_CONTROL:
IX 2 dic' MaskBits&=~CTRLBIT;
=$Sd2UD break;
Q)\4 .d case VK_SHIFT:
6^"Spf] MaskBits&=~SHIFTBIT;
`-82u :" break;
qgw)SuwW default: //judge the key and send message
77p8|63 break;
Dt*/tVF }
3 etW4 for(int index=0;index<MAX_KEY;index++){
@
M if(hCallWnd[index]==NULL)
o0F&,|' continue;
di]TS9&9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W 33MYw {
#w#:f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4:Id8rzz bProcessed=TRUE;
?=0BU} }
h_K!ch} }
JWvL }
c^EU&q{4 else if((lParam&0xc000ffff)==1){ //Key down
[$%O-_x switch(wParam)
,ftKRq {
L~>~a1p! case VK_MENU:
@j=Q$k.GF MaskBits|=ALTBIT;
'o]8UD( break;
zP|^) h5 case VK_CONTROL:
8(""ui8 MaskBits|=CTRLBIT;
pt=H?{06 break;
QL`Hb p case VK_SHIFT:
qjmlwVw MaskBits|=SHIFTBIT;
xv>]e <": break;
XMw*4j2E default: //judge the key and send message
='<789wT break;
QNm8`1 }
Ud'/
9:P for(int index=0;index<MAX_KEY;index++)
`ehcj
G1nY {
\d}>@@U& if(hCallWnd[index]==NULL)
.h[yw$z6 continue;
Vo8gLX]a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NNP ut$. {
MC;2.e` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
h@yn0CU3. bProcessed=TRUE;
.*Ylj2nM }
j NkobJ1 }
YzVhNJWpw }
![j?/376 if(!bProcessed){
;30SnR/ for(int index=0;index<MAX_KEY;index++){
nb_$g@ 03 if(hCallWnd[index]==NULL)
`D={l29H continue;
b,uudtlH if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
i-gN<8\v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
G#nZ%qQ:I }
fm1yZX?` }
_mc-CZ }
OV,t| return CallNextHookEx( hHook, nCode, wParam, lParam );
1paLxR5 }
3
G_0DS 6w)a.^yx7 BOOL InitHotkey()
jWqjGX` {
\x;`8H if(hHook!=NULL){
/Xk-xg+U nHookCount++;
25{-GaB return TRUE;
+Fa!<txn }
^c| _%/ else
X_aC$_b hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Yh2[
nF_ if(hHook!=NULL)
jiqE^j3; nHookCount++;
! N'HL-oT return (hHook!=NULL);
sFV&e->AN\ }
6&`hf > BOOL UnInit()
h1 pEC {
iR]K!j2 if(nHookCount>1){
!\5w<*p8 nHookCount--;
2xK v; return TRUE;
V;29ieE! }
3>QkO.b BOOL unhooked = UnhookWindowsHookEx(hHook);
#%7)a; ' if(unhooked==TRUE){
@A'@%Zv- nHookCount=0;
'M!M$<j hHook=NULL;
c8Je&y8 }
aI;-NnC return unhooked;
h5<eU;Rw+ }
G4]( !f!Kv h0a|R4J BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
D0^h;wJ=4+ {
Fj4>)!^kM BOOL bAdded=FALSE;
*WaqNMD[% for(int index=0;index<MAX_KEY;index++){
WT63ve if(hCallWnd[index]==0){
a(uZ}yS$ hCallWnd[index]=hWnd;
5yk#(i7C HotKey[index]=cKey;
zd|n!3; HotKeyMask[index]=cMask;
LR#BP}\b' bAdded=TRUE;
%%FzBbWAO KeyCount++;
D9h break;
HT
."J }
Q@KCODi }
55Y a(E return bAdded;
7z q@T] }
Kv9Z.DY 6GA+xr= BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ir|c<~_= {
Kk`LuS? BOOL bRemoved=FALSE;
r4m z for(int index=0;index<MAX_KEY;index++){
\zKO5,qw if(hCallWnd[index]==hWnd){
&P7Z_&34Z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
-nXlW hCallWnd[index]=NULL;
}Xvm(
; HotKey[index]=0;
%+^Qs\j HotKeyMask[index]=0;
zf;sdQ;4 bRemoved=TRUE;
'^)}"sZ@G KeyCount--;
U0U y
C break;
8W Etm} }
10_#Z~aU }
7-gT: }
s }Ql9 return bRemoved;
=;Dj[<mJ45 }
ly:2XvV3~
T~L&c void VerifyWindow()
f@[qS7ok {
R$X~d8o>% for(int i=0;i<MAX_KEY;i++){
O,JS*jXl if(hCallWnd
!=NULL){ GZ^Qt*5 {
if(!IsWindow(hCallWnd)){ T@A Qe[U'v
hCallWnd=NULL; *:"@
HotKey=0; mv7W03
HotKeyMask=0; dXfLN<nD>U
KeyCount--; 0j;q^>
} Zm0' p!
} 5] LfJh+"n
} z]7 /Gc,j
} LcZ|A;it
"T9UedZ
BOOL CHookApp::InitInstance() !2h ZtX
{ Gk]ZP31u
AFX_MANAGE_STATE(AfxGetStaticModuleState()); t{s*,X\b
hins=AfxGetInstanceHandle(); k!Q{u2
InitHotkey(); q=}1ud}1
return CWinApp::InitInstance(); DD2K>1A1
} .+,U9e:%
"9 f+F
int CHookApp::ExitInstance() 6$[7hlE
{ U*b7 Pxq;
VerifyWindow(); Z?xRSi2~7
UnInit(); IVY)pS"pR"
return CWinApp::ExitInstance(); @{W"mc+
} |kP utB
u"4B5D
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Evd|_ W-
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cPv(VjS1;
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bf|ePGW?
#if _MSC_VER > 1000 )+R n[MMp
#pragma once @S=9@3m{w;
#endif // _MSC_VER > 1000 K`2(Q
hJsP;y:@Lm
class CCaptureDlg : public CDialog w@<II-9L)<
{ $1g1Bn
// Construction C!|LGzs0
public: YZ`SF"Bd(
BOOL bTray; tj$[szo
BOOL bRegistered; s&Y"a,|Z
BOOL RegisterHotkey(); K8R>O *~
UCHAR cKey; -Caj>K
UCHAR cMask; Q;J(
5;
void DeleteIcon(); vxHFNGI
void AddIcon(); r!
HXhl
UINT nCount; le]~Cy0
void SaveBmp(); x x4GP2
CCaptureDlg(CWnd* pParent = NULL); // standard constructor N#2ldY *
// Dialog Data nwh @F1|
//{{AFX_DATA(CCaptureDlg) ^sB0$|DU
enum { IDD = IDD_CAPTURE_DIALOG }; 3H`{
A/r
CComboBox m_Key; vENf3;o0
BOOL m_bControl; M(zZ8#
BOOL m_bAlt; ZXGi> E
BOOL m_bShift; QW$p{ zo
CString m_Path; l<BV{Gl
CString m_Number; eIfQ
TV
//}}AFX_DATA U8AH,?]#
// ClassWizard generated virtual function overrides QeG9CS)E}j
//{{AFX_VIRTUAL(CCaptureDlg) vaGF(hfTA
public: N@L{9ak1
virtual BOOL PreTranslateMessage(MSG* pMsg); e"52'zAV-
protected: ;}j(x;l>t
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w7o`BR
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); naW!b&:
//}}AFX_VIRTUAL r34MDUZdI
// Implementation Id##367R
protected: y;uR@{
HICON m_hIcon; 31@Lr[!
// Generated message map functions c~?Zmdn:
//{{AFX_MSG(CCaptureDlg) r`.N?
virtual BOOL OnInitDialog(); o$buoGSPc
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q+y\pdhdO
afx_msg void OnPaint(); &'x~<rx
afx_msg HCURSOR OnQueryDragIcon(); Rh?bBAn8
virtual void OnCancel(); mr^3Y8$s
afx_msg void OnAbout(); 2Jio_Hk
afx_msg void OnBrowse(); ]Ob|!L(
afx_msg void OnChange(); u;gO+)wqv
//}}AFX_MSG ##*]2Dy
DECLARE_MESSAGE_MAP() G %6P`:
}; [104;g <
#endif a9z#l}IQ
m^G(qoZ]
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~e 1l7H;
#include "stdafx.h" b.@a,:"
#include "Capture.h" {VE
h@yn
#include "CaptureDlg.h" z.!N|"4yr
#include <windowsx.h> S k~"-HL|
#pragma comment(lib,"hook.lib") CMaph
#ifdef _DEBUG -g]Rs!w'
#define new DEBUG_NEW L"NHr~
#undef THIS_FILE m&Mupl
static char THIS_FILE[] = __FILE__; +ti ?7|bK<
#endif 8s@N NjV
#define IDM_SHELL WM_USER+1 b1.*cIv}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w_xca(
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~DI$O[KpR%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =d<RgwscJ
class CAboutDlg : public CDialog
M .b8 -`V
{ 4
"HX1qP
public: 1!~cPD'F
CAboutDlg(); Y~-y\l;Tr
// Dialog Data Ve3z5d:^
//{{AFX_DATA(CAboutDlg) NEIkG>\7q
enum { IDD = IDD_ABOUTBOX }; >F7w]XH
//}}AFX_DATA >sfg`4
// ClassWizard generated virtual function overrides e~9O#rQI
//{{AFX_VIRTUAL(CAboutDlg) BVNW1<_:
protected: V@G#U[D
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N8b\OTk2
//}}AFX_VIRTUAL 6!ve6ZB[p
// Implementation K Lg1(W(
protected: 3}0\W.jH
//{{AFX_MSG(CAboutDlg) `za,sRFR
//}}AFX_MSG Sw\*$g]
DECLARE_MESSAGE_MAP() $'498%K2
}; ~ELMLwn.
qW0:q.
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sQvRupYRO
{ ]
3"t]U'f
//{{AFX_DATA_INIT(CAboutDlg) c+9L6}D
//}}AFX_DATA_INIT 2}r=DAe0
} <Ep L<K%
rp||#v0l!w
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XH"+oW
{ /x6p
CDialog::DoDataExchange(pDX); a /sj W
//{{AFX_DATA_MAP(CAboutDlg) `hi=y BO
//}}AFX_DATA_MAP //q(v,D%Q
} vxOqo)yO
gBm'9|?
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qd*}d)!
//{{AFX_MSG_MAP(CAboutDlg) &riGzU]
// No message handlers xH-d<Ht,7
//}}AFX_MSG_MAP *1b|j|5v
END_MESSAGE_MAP() ,^UqE{
;*<tU
n^t
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u0q$`9J
: CDialog(CCaptureDlg::IDD, pParent) 4wl1hp>,
{ /\I6j;$z
//{{AFX_DATA_INIT(CCaptureDlg) G*fo9eu5$
m_bControl = FALSE; Wwq:\C
m_bAlt = FALSE; z)qYW6o%
m_bShift = FALSE; /kW Z 8Z
m_Path = _T("c:\\"); mgq!)
m_Number = _T("0 picture captured."); $KiCs]I+
nCount=0; Oj5UG*
bRegistered=FALSE; &O&HczO
bTray=FALSE; 0
&zp
//}}AFX_DATA_INIT Ts5)r(
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \G" S7
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M&Ka^h;N
} =ejj@c
8M,*w6P
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) A`c%p7Z%
{ Ps!MpdcL3
CDialog::DoDataExchange(pDX); ;c(a)_1
//{{AFX_DATA_MAP(CCaptureDlg) |*&l?S
DDX_Control(pDX, IDC_KEY, m_Key); {PHH1dC{
DDX_Check(pDX, IDC_CONTROL, m_bControl); "|SMRc
DDX_Check(pDX, IDC_ALT, m_bAlt); 2/LSB8n|
DDX_Check(pDX, IDC_SHIFT, m_bShift); k~Ex_2;#
DDX_Text(pDX, IDC_PATH, m_Path); 'cW^ S7
DDX_Text(pDX, IDC_NUMBER, m_Number); wVs?E
//}}AFX_DATA_MAP -@W9+Zf5
} ,fkvvM{mq
Td=4V,BN
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -8TJ:#|N
//{{AFX_MSG_MAP(CCaptureDlg) #~*v##^vFH
ON_WM_SYSCOMMAND() )h{&O
,s
ON_WM_PAINT() )`\hK
ON_WM_QUERYDRAGICON() xY^sC56Z
ON_BN_CLICKED(ID_ABOUT, OnAbout) )g0lI
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) h0GoF A<
ON_BN_CLICKED(ID_CHANGE, OnChange) m&.LJ*uM\K
//}}AFX_MSG_MAP CRb8WD6.
END_MESSAGE_MAP() RLmOg{L
WE<?y_0y&
BOOL CCaptureDlg::OnInitDialog() N9e'jM>Oos
{ "TV'}HH
CDialog::OnInitDialog(); &`"DG$N(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $*yYmF
ASSERT(IDM_ABOUTBOX < 0xF000); *]6g-E?:@
CMenu* pSysMenu = GetSystemMenu(FALSE); D'"
T'@
if (pSysMenu != NULL) BuJo W@)
{ NB-dlv1
CString strAboutMenu; oxwbq=a6yV
strAboutMenu.LoadString(IDS_ABOUTBOX); z:Ml;y
if (!strAboutMenu.IsEmpty()) bz4Gzp'6k
{ 1Ms[$$b$
pSysMenu->AppendMenu(MF_SEPARATOR);
*LT~:Gs#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _5oTNL2
} ~wvt:E,fC
} d+9V% T
SetIcon(m_hIcon, TRUE); // Set big icon ]ss[n.T0*
SetIcon(m_hIcon, FALSE); // Set small icon LD$5KaOW
m_Key.SetCurSel(0); Z*,e<zNQ
RegisterHotkey(); Av X1*
CMenu* pMenu=GetSystemMenu(FALSE); N'Gq9A
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~f/|bcep
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <Vat@e
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Wh[QR-7Ew
return TRUE; // return TRUE unless you set the focus to a control `zd,^.i5~
} vCzZjGBY
*FS8]!Qg
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `KJ(. m
{ a:kAo0@":j
if ((nID & 0xFFF0) == IDM_ABOUTBOX) D31X {dJ
{ %()d$.F
CAboutDlg dlgAbout; %go2tv:|W
dlgAbout.DoModal(); )H8_.]|
} ;Rrh$Ag
else %pC<T*f
{ ,/;Aew;
CDialog::OnSysCommand(nID, lParam); 1'kO{Ge*p:
} =C"[o\]VV
}
q6
CrUn
pwFp<O"
void CCaptureDlg::OnPaint() ewDYu=`*
{ -^_m(@A<~
if (IsIconic()) "F
F$Q#)
{ ("$/sT
CPaintDC dc(this); // device context for painting B}e/MlX3M
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); m4:c$5
// Center icon in client rectangle
~?ab_CY
int cxIcon = GetSystemMetrics(SM_CXICON); ^7gGtz2
int cyIcon = GetSystemMetrics(SM_CYICON); zj
6I:Qr
CRect rect; &i#$ia r
GetClientRect(&rect); _y@28t
int x = (rect.Width() - cxIcon + 1) / 2; Y]z
:^D
int y = (rect.Height() - cyIcon + 1) / 2; ]\E"oZ
// Draw the icon +;N]34>S7
dc.DrawIcon(x, y, m_hIcon); Q@D7\<t
} VtBC~?2U)B
else &D,Iwq
{ d?,'$$ aB
CDialog::OnPaint(); xc^@"
} v 6 ~9)\!j
} 222 Y?3>@D
DUp`zW;B
HCURSOR CCaptureDlg::OnQueryDragIcon() wk(25(1q
{ 8-Abg:)
return (HCURSOR) m_hIcon; |/Nh#
} tKbxC>w
/cjz=r1U>
void CCaptureDlg::OnCancel() P/%7kD@5;
{ 6h 0qtXn-
if(bTray) FO!Td
DeleteIcon(); A*JOp8\)
CDialog::OnCancel(); 4TtC~#D:
} 3I)~;>meo
N*Y[[N(
void CCaptureDlg::OnAbout() Fmk:[hMw
{ X5 vMY
CAboutDlg dlg; $)lkiA&;
dlg.DoModal(); KVi6vdgD
} ?N#I2jxaD
*?)MJ@
void CCaptureDlg::OnBrowse() +! 1_Mt6
{ 1d^~KBfv
CString str; oD)x\ )t8
BROWSEINFO bi; uEPp%&D.+
char name[MAX_PATH]; !)s(Lv%]
ZeroMemory(&bi,sizeof(BROWSEINFO)); L/k35 x8
bi.hwndOwner=GetSafeHwnd(); c%&,(NJ]K
bi.pszDisplayName=name; m#"_x{oa
bi.lpszTitle="Select folder"; v%tjZ5x
bi.ulFlags=BIF_RETURNONLYFSDIRS; -&+:7t
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Cbbdq%ySI
if(idl==NULL) ~i,d%a
return; &l(T},-X
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7)?C+=,0
str.ReleaseBuffer(); x :SjdT
m_Path=str; w$]G$e
if(str.GetAt(str.GetLength()-1)!='\\') kmQ:wf:
m_Path+="\\"; LdUz;sb
UpdateData(FALSE); [2:d@=%.
} ZO+RE7f*?c
SN6 QX!3
void CCaptureDlg::SaveBmp() Ly=.
{ pPReo)
CDC dc; ~q>jXi
dc.CreateDC("DISPLAY",NULL,NULL,NULL); vYgJu-Sl
CBitmap bm; /[R=-s ;
int Width=GetSystemMetrics(SM_CXSCREEN); inu.U[.
int Height=GetSystemMetrics(SM_CYSCREEN); HQ-[k$d
W4
bm.CreateCompatibleBitmap(&dc,Width,Height); aDS:82GMQ
CDC tdc; lrrTeE*
tdc.CreateCompatibleDC(&dc); *G"hjc$L
CBitmap*pOld=tdc.SelectObject(&bm); X3:1KDVsV
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }7PJr/IuF
tdc.SelectObject(pOld); ;,y_^-h;
BITMAP btm; <ZC.9
bm.GetBitmap(&btm); y?sz&*:
DWORD size=btm.bmWidthBytes*btm.bmHeight; ZCCCuB
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dc$zW^i
BITMAPINFOHEADER bih; Y3~Uz#`SU
bih.biBitCount=btm.bmBitsPixel; }8'_M/u\
bih.biClrImportant=0; LkbD='\=
bih.biClrUsed=0; e=Ox~2S
bih.biCompression=0; $tlBI:ay1
bih.biHeight=btm.bmHeight; -Jv,#Z3
bih.biPlanes=1; Ey@^gHku\
bih.biSize=sizeof(BITMAPINFOHEADER);
yg\QtWWM
bih.biSizeImage=size; D+T/ Z)
bih.biWidth=btm.bmWidth; G|cjI*
bih.biXPelsPerMeter=0; ,Yag! i>;
bih.biYPelsPerMeter=0; RDps{),E;d
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); k>i88^kPV
static int filecount=0; S|tD8A
CString name; 3M#x)cW
name.Format("pict%04d.bmp",filecount++); N"9^A^w8k
name=m_Path+name; 6 (rm%c
BITMAPFILEHEADER bfh; 8\J$\Edv
bfh.bfReserved1=bfh.bfReserved2=0; l;-2hZ
bfh.bfType=((WORD)('M'<< 8)|'B'); Tzd#!Lvm:,
bfh.bfSize=54+size; |Iy;_8c
bfh.bfOffBits=54; {$S"Sj
CFile bf; r^k+D<k[7
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =Jp:dM*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [REH*_
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B:>:$LIL
bf.WriteHuge(lpData,size); QPuc{NcB>
bf.Close(); O>E}Lu;|
nCount++; JMAdsg/
} R0t!y3r&N
GlobalFreePtr(lpData); ,e'r 0
if(nCount==1) FQek+[ox
m_Number.Format("%d picture captured.",nCount); uc9h}QJ*
else 9>{fsy
m_Number.Format("%d pictures captured.",nCount); `;mgJD
UpdateData(FALSE); h-p}Qil,
} J;sQvPHV8
7 [e-3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >VhZv75
{ rBJ`=o z
if(pMsg -> message == WM_KEYDOWN) O%%Q./oh
{ $uLTYu
if(pMsg -> wParam == VK_ESCAPE) @5d^ C
return TRUE; <*vR_?!
if(pMsg -> wParam == VK_RETURN) F`KXG$
return TRUE; KKwM\
} u?V}pYX
return CDialog::PreTranslateMessage(pMsg); @@ j\OR
} taDe^Istj
8{Wl
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :@(1~Hm
{ 6TRLHL~B
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2UQF:R?LQ
SaveBmp(); Zx8$M5
return FALSE; OX,em Ti
} (ot,CpI(I
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "%K'~"S#Q,
CMenu pop; H~*N:$C
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Az8b_:=
CMenu*pMenu=pop.GetSubMenu(0); K0>;4E>B
pMenu->SetDefaultItem(ID_EXITICON); gpq ,rOIK
CPoint pt; 0L;,\&*u
GetCursorPos(&pt); *mV?_4!,f7
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); tk0m[HN@eV
if(id==ID_EXITICON) >QDyG8*
DeleteIcon(); IFW(nB(
else if(id==ID_EXIT) 23|JgKuA
OnCancel(); L1_O!EQ
return FALSE; aj|3(2;Kp
} ll}_EUF|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5]mH.{$x$?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e@c8Ce|0
AddIcon(); $c*fbBM(&n
return res; ^5Y<evjm
} 7(5d$ W
qKSR5 #
void CCaptureDlg::AddIcon() iK2f]h
{ WiH8j$;xu
NOTIFYICONDATA data; y%|E z
data.cbSize=sizeof(NOTIFYICONDATA); H/t0#
CString tip; \[!{tbK`2
tip.LoadString(IDS_ICONTIP); >0 7i"a
data.hIcon=GetIcon(0); O0y0'P-rJq
data.hWnd=GetSafeHwnd(); 75>%!mhM
strcpy(data.szTip,tip); Y"ta`+VJ
data.uCallbackMessage=IDM_SHELL;
/1TK+E$
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Dj= {%
data.uID=98; :xg
J2
Shell_NotifyIcon(NIM_ADD,&data); |`yU \
ShowWindow(SW_HIDE); DK2Wjr;
bTray=TRUE; .|"E:qTD
} S%H"i
y
&pY$\
void CCaptureDlg::DeleteIcon() zvN7aG
{ c}v8j2{
NOTIFYICONDATA data; Sj)?!
data.cbSize=sizeof(NOTIFYICONDATA); @Y,t]
data.hWnd=GetSafeHwnd(); =Crl{Ax
data.uID=98; ka=A:biz
Shell_NotifyIcon(NIM_DELETE,&data); ZYY`f/qi
ShowWindow(SW_SHOW); qAp<OJ
SetForegroundWindow(); AW;xlY= g
ShowWindow(SW_SHOWNORMAL); %-YWn`yEm
bTray=FALSE; BZOl&G(
} dJzaP
^0"fPG`
void CCaptureDlg::OnChange() GRpwEfG
{ S^q^=q0F
RegisterHotkey(); m
Urb
} "cS7E5-|
5~>j98K
BOOL CCaptureDlg::RegisterHotkey() ~Y0K Wx4
{ ;"f9"
UpdateData(); -~sW@u)O
UCHAR mask=0; f*V^HfiQb
UCHAR key=0; p%Q{Rqc)
if(m_bControl) io"NqR#"v
mask|=4; zp4@T)
if(m_bAlt) ;B<rw^h5
mask|=2; lX.1B&T9Lr
if(m_bShift) |-v/
mask|=1; UU}Hs}
key=Key_Table[m_Key.GetCurSel()]; UQI!/6F
if(bRegistered){ d:Z|It
DeleteHotkey(GetSafeHwnd(),cKey,cMask); )-XD=
]
bRegistered=FALSE; ]=3hH+1 a
} C(sz/x?11
cMask=mask; &]f8Xd
cKey=key; n\7>_
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z3<lJk\Y
return bRegistered; W-D4"
G@
} X+;#^A3
l d%#.~Q
四、小结 :\mdVS!o
M~X~2`fFH
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。