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:
}cg 1CT5
Zg >!5{T 一、实现方法
cHwN=mg]S cLMFC1=b 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:
t%Y}JKLR .~4DlT #pragma data_seg("shareddata")
QST-!`]v HHOOK hHook =NULL; //钩子句柄
SwhArvS UINT nHookCount =0; //挂接的程序数目
e\]CZ5hs3 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
1ka58_^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
et6@);F static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
it=ir9 static int KeyCount =0;
/6p7k static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
|C\XU5} #pragma data_seg()
b"~Ct}6f DQ_ pLXCC 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。
d^XRkB:h )`m/vYKWL 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:
qTnk>g_oS& K.6xNQl{} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
:D=y<n;S+ cKey,UCHAR cMask)
H=_k|#/ {
Bj\ oo+L/ BOOL bAdded=FALSE;
IN!IjInaT@ for(int index=0;index<MAX_KEY;index++){
Je~<2EsQ if(hCallWnd[index]==0){
; <|m0>X hCallWnd[index]=hWnd;
/k^O1+]H HotKey[index]=cKey;
Y;q['h HotKeyMask[index]=cMask;
$C6O<A bAdded=TRUE;
]N1gzHaS KeyCount++;
|_wbxdq break;
0bR})}a+Yg }
:FI4GR*? }
XFvPc return bAdded;
eX{Tyd{ }
ixo?o]Xb` //删除热键
Qx[
nR/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C.{z+ {
n0=[N'Tw3 BOOL bRemoved=FALSE;
j;i7.B"[ for(int index=0;index<MAX_KEY;index++){
Dad*6;+N if(hCallWnd[index]==hWnd){
[moz{Y if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ILXV yU hCallWnd[index]=NULL;
8'Bik HotKey[index]=0;
{;Y2O.lV HotKeyMask[index]=0;
tje bRemoved=TRUE;
A(qy>x-BI KeyCount--;
e/ V8lo break;
\g\, }
8@4)p.{5I }
*'ex>4^ }
5TcirVO82 return bRemoved;
+J%9%DqF }
'B$qq[l]S E.OL_ \ n/-d56 DLL中的钩子函数如下:
KdkZ-. )I9W a*I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a`uHkRX
)U {
{t<U:*n2 BOOL bProcessed=FALSE;
`$N AK if(HC_ACTION==nCode)
L\H,cimN {
[|\BuUT' if((lParam&0xc0000000)==0xc0000000){// 有键松开
<Q?X'. switch(wParam)
<YBA
7i {
*ZA.O case VK_MENU:
bcZ s+FOPd MaskBits&=~ALTBIT;
A{b?ZT~2] break;
Dz>v;%$S- case VK_CONTROL:
66l$}+|Zzc MaskBits&=~CTRLBIT;
xk8P4`;d$ break;
&+V|L dh case VK_SHIFT:
/I3>u MaskBits&=~SHIFTBIT;
kkE1CHY break;
7tr;adjs default: //judge the key and send message
c_^-`7g break;
9hIcnPu }
_,;|, for(int index=0;index<MAX_KEY;index++){
QC*>
qo if(hCallWnd[index]==NULL)
eZ~ZWb, % continue;
rZv5>aEI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cA{zyq26 {
L|[0&u! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Gdf*x<T1 bProcessed=TRUE;
.I&]G }
_4jRUsvjY }
|0$wRl+kN }
}^
j"@{~ else if((lParam&0xc000ffff)==1){ //有键按下
rwUKg[
1N switch(wParam)
2,O;<9au< {
Lg[_9`\ case VK_MENU:
h tn?iLq MaskBits|=ALTBIT;
]OKs65 break;
vo_m$ /O case VK_CONTROL:
#(G#O1+ MaskBits|=CTRLBIT;
e8"?Qm7 J break;
GY%48}7 case VK_SHIFT:
.oFkx*Ln MaskBits|=SHIFTBIT;
>>C(y?g break;
HO(9)sK default: //judge the key and send message
U^$o<2 break;
*@2?_b}A
^ }
m# ]VdO'f for(int index=0;index<MAX_KEY;index++){
k6vY/)-S if(hCallWnd[index]==NULL)
v&GBu continue;
Z
^tF if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
} 1> i {
YI*Av+Z) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
h)qapC5z, bProcessed=TRUE;
sKT GZA }
)0I;+9:D= }
mw1|>*X&R }
kU5chltGF if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
<ZV !fn for(int index=0;index<MAX_KEY;index++){
:3# t; if(hCallWnd[index]==NULL)
;-1yG@KG continue;
,nELWzz%{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
nRmZu\(Ow| SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Dog Tj //lParam的意义可看MSDN中WM_KEYDOWN部分
6R+m;' }
$(ugnnJ* }
SBY
}
gL+8fX2G6 return CallNextHookEx( hHook, nCode, wParam, lParam );
\*0ow`|K }
PKhH0O\_U jz_\B(m9% 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:
mG!Rh (bk~,n_ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
TrHz(no BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
=*aun& #lM :BO 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:
>d&_e[j 0N~AQu LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
gZ*8F|sg {
Jm|eZDp if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Ub8|x]ix {
DV(^h$1_ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
XO*62>Ed SaveBmp();
JR1/\F<} return FALSE;
85<zl|ZD }
OE(Z)|LF …… //其它处理及默认处理
(dxkDS-G }
_[8BAm 4
|E` !'()QtvC< 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
P%v7(bqL4+ e{~s\G8g 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
ZlHN-!OZp =8?gx$r2 二、编程步骤
;=IGl:
]:m}nJ_ 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";
:66xrw _
FcfNF 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
6Hz45 0i2ZgOJ 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;
DbdxHuKa> \Ze"Hv 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;
`Tx1?] :bxq%D%|o 5、 添加代码,编译运行程序。
OQ>r;)/ Br2ZloJ@+ 三、程序代码
Ldnw1xy 2-9'zN0u ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
T.vkGB=QZ% #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
1'dL8Y #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
*7'}"@@ #if _MSC_VER > 1000
$\xS~w #pragma once
ewYZ} "o #endif // _MSC_VER > 1000
iol.RszlZ| #ifndef __AFXWIN_H__
URbu=U #error include 'stdafx.h' before including this file for PCH
DS,"^K #endif
R&13P&:g #include "resource.h" // main symbols
v*+.;60_ class CHookApp : public CWinApp
_e<3 g9bj {
8}FZ1h2
4 public:
Tz H*?bpP CHookApp();
"=0#pH1o // Overrides
Y4Hi<JWo // ClassWizard generated virtual function overrides
n%lY7.z8d //{{AFX_VIRTUAL(CHookApp)
sEj?,1jk public:
b$kCyOg virtual BOOL InitInstance();
ULq#2l virtual int ExitInstance();
d>z?JDt //}}AFX_VIRTUAL
xyK_1n@b //{{AFX_MSG(CHookApp)
Re3vW re // NOTE - the ClassWizard will add and remove member functions here.
75j`3wzu // DO NOT EDIT what you see in these blocks of generated code !
'"{ IV //}}AFX_MSG
:zk69P3 DECLARE_MESSAGE_MAP()
__\Tv>Y };
s)dN.'5/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Aen)r@Y: BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u:r'jb~@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)x1LOMe BOOL InitHotkey();
A ^YHtJ BOOL UnInit();
DGMvYNKTj #endif
85U')LY ?Xscc mN //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
c0v;r4Jo#j #include "stdafx.h"
+5Yf9 #include "hook.h"
yjUSM}$ #include <windowsx.h>
-7:J#T/\ #ifdef _DEBUG
|cwGc\ES #define new DEBUG_NEW
[bd fp
a #undef THIS_FILE
X p4x:N static char THIS_FILE[] = __FILE__;
yk1syN_ #endif
IKhpe5} #define MAX_KEY 100
K4]c #define CTRLBIT 0x04
RI_:~^nO{r #define ALTBIT 0x02
|EuWzhNAO #define SHIFTBIT 0x01
Ur`Ri? #pragma data_seg("shareddata")
]2kgG*^n" HHOOK hHook =NULL;
l][{
#>V UINT nHookCount =0;
RkVU^N" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
P+!j[X^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
&K@2kq, static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
DN)Ehd. static int KeyCount =0;
&?\ h[3 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
zG|}| //} #pragma data_seg()
rtr0 d HINSTANCE hins;
(P
{o9 void VerifyWindow();
V
QE *B BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
1df}gG //{{AFX_MSG_MAP(CHookApp)
+$Q33@F5l // NOTE - the ClassWizard will add and remove mapping macros here.
E5.3wOE // DO NOT EDIT what you see in these blocks of generated code!
LyM" //}}AFX_MSG_MAP
hC@oyC(4 END_MESSAGE_MAP()
WyH2` xxX $Yh7N5XH, CHookApp::CHookApp()
FCv3ZF?K {
sr!m // TODO: add construction code here,
2x-67_BHY= // Place all significant initialization in InitInstance
Wu]Dpe }
0\f3L a r'7>J:cy= CHookApp theApp;
Bd$i%.r LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@RW=(&<1 {
;C=C`$Q BOOL bProcessed=FALSE;
tZR%s if(HC_ACTION==nCode)
:d7Ju.*J {
`N%q^f~ if((lParam&0xc0000000)==0xc0000000){// Key up
VmM?KlC switch(wParam)
#8P9}WTno. {
F;l*@y Tq case VK_MENU:
n!5 :I#B MaskBits&=~ALTBIT;
5 3=zHYQ break;
b]s.h8+v; case VK_CONTROL:
:4]^PB@dl MaskBits&=~CTRLBIT;
8 ;oU{ break;
'1]Iu@? case VK_SHIFT:
JiL%1y9| MaskBits&=~SHIFTBIT;
aW-'Jg=@H^ break;
Bi?+e~R default: //judge the key and send message
Id3i qAL break;
U5 ~L^ }
AW;"` ]. for(int index=0;index<MAX_KEY;index++){
}r:H7&|& if(hCallWnd[index]==NULL)
p`ai2`qC` continue;
[UN`~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<
&[=,R0 @ {
K@u\^6419 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
A7!!kR": bProcessed=TRUE;
uY+N163i }
R(Y4n w+Y- }
C.M]~"e }
O?|st$g else if((lParam&0xc000ffff)==1){ //Key down
).HYW _Yih switch(wParam)
sV{M#UF2 {
wmh[yYWc case VK_MENU:
V_*TY6 MaskBits|=ALTBIT;
,gHgb break;
o<T_Pjp case VK_CONTROL:
w.kb/ MaskBits|=CTRLBIT;
zRDBl02v$T break;
/L,VZ?CmtK case VK_SHIFT:
9
z_9yT MaskBits|=SHIFTBIT;
-xi]~svg break;
-s
Iji)t default: //judge the key and send message
i6F`KF'i& break;
,1+AfI }
I6}ineps for(int index=0;index<MAX_KEY;index++)
&y-(UOqbkP {
mup<%@7m if(hCallWnd[index]==NULL)
67zCil continue;
Dk&@AjJga if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H% c:f {
p]z
* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
kae&,'@JF bProcessed=TRUE;
nRKh|B) }
G?\\k[#,& }
Cf#[E~2 4 }
cnfjOg'\{ if(!bProcessed){
D,Ft*(|T for(int index=0;index<MAX_KEY;index++){
w>M8FG(4] if(hCallWnd[index]==NULL)
^F@z+q continue;
Q)}_S@v|% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
*^]Hqf(` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\OMWE/qMy }
JY4sB8 }
S+LE ASOr }
Lw EI return CallNextHookEx( hHook, nCode, wParam, lParam );
P9j[
NEV }
+z/_'DE +m Plid\ BOOL InitHotkey()
*z-Mr~V {
oZ%rzLH if(hHook!=NULL){
=bt/2nPV nHookCount++;
E3X6-J| return TRUE;
>U/m/H' }
Qo7]fnnaV else
@SH%l] hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
04eE\%? if(hHook!=NULL)
7`,A]":; nHookCount++;
L8"0o 0- return (hHook!=NULL);
1t" }
Z]H`s{3 BOOL UnInit()
JWHKa=-H {
c#lW ? if(nHookCount>1){
ROZOX$XM nHookCount--;
)%e`SGmp return TRUE;
SM3Q29XIw }
6wk/IJ` BOOL unhooked = UnhookWindowsHookEx(hHook);
ESdjDg$[u if(unhooked==TRUE){
I7!+~uX nHookCount=0;
Rlvb@aXgy hHook=NULL;
p
BU,"Yy& }
:CH?,x^!@ return unhooked;
[~cb&6|M }
>l|ao&z>bm j*uc$hC" BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5r#0/1ym! {
k@HV
wK'y BOOL bAdded=FALSE;
rkw^ RW^ for(int index=0;index<MAX_KEY;index++){
GabYxYK if(hCallWnd[index]==0){
F'eV%g hCallWnd[index]=hWnd;
W(
O)J$j HotKey[index]=cKey;
~N{ 7 HotKeyMask[index]=cMask;
";:"p6? bAdded=TRUE;
>fCz,.L KeyCount++;
yk1.fxik' break;
3yT7;~vPj }
zoFCHsr }
1Yj ^N"= return bAdded;
qo2/? ]
}
"u#T0 xWNB/{F BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@m*^v\q<u {
x'Uv;mGo BOOL bRemoved=FALSE;
xiv1y4(% for(int index=0;index<MAX_KEY;index++){
:aYbP,mE if(hCallWnd[index]==hWnd){
8t{- if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
85$W\d hCallWnd[index]=NULL;
P)VysYb? HotKey[index]=0;
JA .J~3 HotKeyMask[index]=0;
GwHp@_> bRemoved=TRUE;
_0Mt*]L } KeyCount--;
'q+CL&D break;
-ti
nL(?3 }
VK7lm|J+ }
;xp^FKP }
sA(
e return bRemoved;
8KQD
w: }
v.wHj@ 7 (}gs?&w void VerifyWindow()
$kc*~V~ {
3`V#ImV> for(int i=0;i<MAX_KEY;i++){
x RV@_ if(hCallWnd
!=NULL){ ;QVX'?
if(!IsWindow(hCallWnd)){ <,r(^Ntz
hCallWnd=NULL; $j ZU(<4,
HotKey=0; y81B3`@
HotKeyMask=0; cr;\;Ta_!W
KeyCount--; z%$,F9/
} Z?IwR
} bf9LR1
} c:%ll&Xtn
} *U[Nn5#?
=3~u.iq$
BOOL CHookApp::InitInstance() q6xm#Fd'.
{ +W{ELdup%q
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0vu$dxb[
hins=AfxGetInstanceHandle(); ;@I4[4ph}
InitHotkey(); ;ALkeUR[
return CWinApp::InitInstance(); 3&'u7e
} u0Nag=cU
y.pwj~s
int CHookApp::ExitInstance() q4'Vb
{ s]tBd!~
VerifyWindow(); 7'pmW,;
UnInit(); ZS@ Gt
return CWinApp::ExitInstance(); 38I .1p9
} "4 Lt:o4x
`i'72\(
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D^R=
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^xBF$ua37)
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ G4VdJ(_
#if _MSC_VER > 1000 >?pWbL
#pragma once mBp3_E.t
#endif // _MSC_VER > 1000 7q%<JZPY
&}YJ"o[I
class CCaptureDlg : public CDialog `7f><p/q
{ _8-iO.T+2
// Construction Z9TUaMhF
public: Sr9)i8x{
BOOL bTray; ZSB_OS[N
BOOL bRegistered; 1c$<z~
BOOL RegisterHotkey(); F|rJ{=x
UCHAR cKey; QA=G+1x
UCHAR cMask; e 58
void DeleteIcon(); E3p3DM0F$
void AddIcon(); /b$0).fj@,
UINT nCount; ~v
/N G
void SaveBmp(); J ejDF*Q
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z~JX@s0v
// Dialog Data U}6FB =
//{{AFX_DATA(CCaptureDlg) *@E Itj `
enum { IDD = IDD_CAPTURE_DIALOG }; b1("(,r/`
CComboBox m_Key; y<53xZi
BOOL m_bControl; p1-bq:
BOOL m_bAlt; -zzM!1@F
BOOL m_bShift; m|7lDfpb
CString m_Path; -{ae
CString m_Number; Usa
//}}AFX_DATA 4 ^=qc99
// ClassWizard generated virtual function overrides 9JG9;[
//{{AFX_VIRTUAL(CCaptureDlg)
R%(ww
public: :9_N
Y"P
virtual BOOL PreTranslateMessage(MSG* pMsg); rO_|_nV[
protected: ]m>N!Iu
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZPM,ZGlu:
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0+i\j`O&
//}}AFX_VIRTUAL T:/68b*H\:
// Implementation dzK]F/L]
protected: Z5oX "Yx
HICON m_hIcon; #Cwzk{p(
// Generated message map functions Eyv|~D
//{{AFX_MSG(CCaptureDlg) w6^X*tE
virtual BOOL OnInitDialog(); /c`s$h4-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); m((A
afx_msg void OnPaint(); #4?(A[]>H
afx_msg HCURSOR OnQueryDragIcon(); C< :F<[H
virtual void OnCancel(); uSAb
afx_msg void OnAbout(); bIX'|=
afx_msg void OnBrowse(); d1MVhE
afx_msg void OnChange(); C:]&V*d.v4
//}}AFX_MSG liYR8 D
|
DECLARE_MESSAGE_MAP() 4. &t
}; F(-1m A&-
#endif 1pUIZ$@?`
Is87
9_Z
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ";)SA,Z
#include "stdafx.h" j3!]wolY
#include "Capture.h" 5]Wkk~a
#include "CaptureDlg.h" Kg#5
@;
#include <windowsx.h> v7"Hvp3w
#pragma comment(lib,"hook.lib") pB3dx#l
#ifdef _DEBUG 6.%V"l
#define new DEBUG_NEW 2n9E:tc
#undef THIS_FILE )u. ut8![T
static char THIS_FILE[] = __FILE__; UE3#(:xA
#endif JG2)-x;9
#define IDM_SHELL WM_USER+1 b&Dc DX
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O_PKS$sz{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \Z +O9T%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; VW7
?{EL7
class CAboutDlg : public CDialog \XG18V&
{ .js@F/Hp
public: fP>K!@!8
CAboutDlg(); zH0{S.3k
// Dialog Data u}Q@u!~e9
//{{AFX_DATA(CAboutDlg) ty8\@l
enum { IDD = IDD_ABOUTBOX }; 94=aVM\>>
//}}AFX_DATA =Vgj=19X(
// ClassWizard generated virtual function overrides ~%6GF57gC
//{{AFX_VIRTUAL(CAboutDlg) jLULf+8&
protected: w3^>{2iqq
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4eSV(u)4
//}}AFX_VIRTUAL hRn[ 9B
// Implementation H8>u:
protected: 6J|Ee1Ez
//{{AFX_MSG(CAboutDlg) 1 :xN )M,s
//}}AFX_MSG D4:c)}
DECLARE_MESSAGE_MAP() SX$Nef9p
}; yDt3)fP#
zSYh\g"
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) o{EWNkmj
{ `Gl@?9,i
//{{AFX_DATA_INIT(CAboutDlg) +4k Bd<0Y
//}}AFX_DATA_INIT FFT h}>>
} @v1f)(N
C~4$A/&(
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #+2|ZfCn%
{ =O
qw`jw
CDialog::DoDataExchange(pDX); `+~@VZ3m
//{{AFX_DATA_MAP(CAboutDlg) WcyN,5
//}}AFX_DATA_MAP c}nXMA^^
} Ns6Vf5T.
.Dw^'p>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qb+vptg@I
//{{AFX_MSG_MAP(CAboutDlg) &j@i>(7
// No message handlers c
k=
//}}AFX_MSG_MAP ,UFr??ZKm
END_MESSAGE_MAP() ,q
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w5I
+5/I
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D`=hP(y^
: CDialog(CCaptureDlg::IDD, pParent) d%$'Y|
{ kRBPl99
//{{AFX_DATA_INIT(CCaptureDlg) *KP
60T
m_bControl = FALSE; :tu_@3bg-
m_bAlt = FALSE; W
s!N%%g
m_bShift = FALSE; em@\S
m_Path = _T("c:\\"); Te`Z
Qqb
m_Number = _T("0 picture captured."); $I%75IZ
nCount=0; Ju$vuEO
bRegistered=FALSE; gB!K{ Io'
bTray=FALSE; gt5
//}}AFX_DATA_INIT b??k|q
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;C8'7
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *)c,~R^
} g->cgExj
P=K+!3ZXo
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hB#z8D
{ Z6<vLc
CDialog::DoDataExchange(pDX); {0fQ"))"
//{{AFX_DATA_MAP(CCaptureDlg) n/_cJD\
DDX_Control(pDX, IDC_KEY, m_Key); u 89u#gCAC
DDX_Check(pDX, IDC_CONTROL, m_bControl); Xp]tL3-p
DDX_Check(pDX, IDC_ALT, m_bAlt); *N"bn'>3
DDX_Check(pDX, IDC_SHIFT, m_bShift); Cc:m~e6r
DDX_Text(pDX, IDC_PATH, m_Path); n237%LH[
DDX_Text(pDX, IDC_NUMBER, m_Number); CErkmod{}e
//}}AFX_DATA_MAP f!}c0nb
} :%Dw3IrOM
h(hb?f@1:
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `;L0ax
//{{AFX_MSG_MAP(CCaptureDlg) W?m?r.K?
ON_WM_SYSCOMMAND() DXAA[hUjF
ON_WM_PAINT() :U`8s#
ON_WM_QUERYDRAGICON() 6g@@V=mf
ON_BN_CLICKED(ID_ABOUT, OnAbout) [{F8+a^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oLcOp.8h[
ON_BN_CLICKED(ID_CHANGE, OnChange) s1XW}Dw
//}}AFX_MSG_MAP /i+8b(x
END_MESSAGE_MAP() "1rZwFI0l
JHN35a+
BOOL CCaptureDlg::OnInitDialog() Pm]6E[zC
{ ^'DrU<o
CDialog::OnInitDialog(); 24 S,w>j
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t@-:e^ v
ASSERT(IDM_ABOUTBOX < 0xF000); v~:$]a8
CMenu* pSysMenu = GetSystemMenu(FALSE); 3\6UH
if (pSysMenu != NULL) T!o 4k
{ rt5UT~
CString strAboutMenu; /ey[cm2#[s
strAboutMenu.LoadString(IDS_ABOUTBOX); Qci<cVgP
if (!strAboutMenu.IsEmpty()) N1ZHaZ
{ Fkas*79
pSysMenu->AppendMenu(MF_SEPARATOR); $smzP.V
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &$fe%1#
} 2 @g'3M
} C !81Km5
SetIcon(m_hIcon, TRUE); // Set big icon SGMLs'D
SetIcon(m_hIcon, FALSE); // Set small icon 5gWn{[[e)y
m_Key.SetCurSel(0); =:(8F*Q
RegisterHotkey(); 8Z>ZjNG
CMenu* pMenu=GetSystemMenu(FALSE); fSdv%$;Hc
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Dqu1!f
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2s,wC!',
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hM2^[8
return TRUE; // return TRUE unless you set the focus to a control 'j];tO6GfC
} uQ#3;sFO
!8]W"@qb
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [#H$@g|CT
{ Zs!)w9y&V
if ((nID & 0xFFF0) == IDM_ABOUTBOX) WF<0QH
{ ^ MkT">
CAboutDlg dlgAbout; 6.|f iQs]
dlgAbout.DoModal(); vyT$IdV2
} CqDMq !
else HPs$R[
{ 5:SfPAx
CDialog::OnSysCommand(nID, lParam); w}pFa76rm
} @)iv'
} 0Ha1pqR
4f~hd-z
void CCaptureDlg::OnPaint() Zk2-U"0\o
{ C(C4R+U
if (IsIconic()) z%t>z9hU
{ +u*WUw!%
CPaintDC dc(this); // device context for painting bU1UNm`{C
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?lCKZm.,(-
// Center icon in client rectangle xmZ]mu,,$
int cxIcon = GetSystemMetrics(SM_CXICON); D!TL~3d
1
int cyIcon = GetSystemMetrics(SM_CYICON); s]0x^"#B
CRect rect; 2a2C z'G
GetClientRect(&rect); RLr;]j8cm
int x = (rect.Width() - cxIcon + 1) / 2; 0o[p<<c*
int y = (rect.Height() - cyIcon + 1) / 2; JI5?,
)-St
// Draw the icon waXA%u50
dc.DrawIcon(x, y, m_hIcon); +r9:n(VP
} 2#5SI
else <R}(UK
{ xtN%v0ZZ
CDialog::OnPaint(); v]gJ 7x
} 0Ep%&>@
} a;m-Vu!
&| el8;D
HCURSOR CCaptureDlg::OnQueryDragIcon() H Kx2QFB
{ R<)7,i`F
return (HCURSOR) m_hIcon; YVZm^@ZVV
} {$ 4fRxj
25h.u>6@{
void CCaptureDlg::OnCancel() X:+;d8rCy
{ E
N%cjvE
if(bTray) 1p>5ZkHb
DeleteIcon(); Z<z(;)?c
CDialog::OnCancel(); UceZWtYa
} XX~~SvSM
Lm"l*j4
void CCaptureDlg::OnAbout() |eWlB\ x8
{ e.n&Os<|<
CAboutDlg dlg; ]~CGzV
dlg.DoModal(); om$)8'A,l
} LnvC{#TFO
^,'!j/w5
void CCaptureDlg::OnBrowse() L~SM#?z:ue
{ HS]|s':
CString str; "zR+}
BROWSEINFO bi; f$9V_j-K+
char name[MAX_PATH]; ?%(8RQ
ZeroMemory(&bi,sizeof(BROWSEINFO)); Q/r9r*>z
bi.hwndOwner=GetSafeHwnd(); bl(rCbj(w
bi.pszDisplayName=name; V[Fzh\2n
bi.lpszTitle="Select folder"; Xm*gH, '
bi.ulFlags=BIF_RETURNONLYFSDIRS; ~c,HE] B
LPITEMIDLIST idl=SHBrowseForFolder(&bi); )P@t,mxW/
if(idl==NULL) |i7|QLUT
return; \kZxys!4
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cF3V{b|bU
str.ReleaseBuffer(); $`x4|a8-
m_Path=str; WMZ&LlB%
if(str.GetAt(str.GetLength()-1)!='\\') BdB/`X*
m_Path+="\\"; zn&NLsA
UpdateData(FALSE); qYZX,
x
} BftW<1,U^
i}N'WV`!
void CCaptureDlg::SaveBmp() ([iMOE[D3
{ I/rq@27o
CDC dc; *Ibl+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xa#`VDh
CBitmap bm; g:`V:kbY$
int Width=GetSystemMetrics(SM_CXSCREEN); Wcl@H @
int Height=GetSystemMetrics(SM_CYSCREEN); tM <6c+
bm.CreateCompatibleBitmap(&dc,Width,Height); PYPs64kNC]
CDC tdc; G+[hE|L~y
tdc.CreateCompatibleDC(&dc); Vq2d+
,fb
CBitmap*pOld=tdc.SelectObject(&bm); E(*RtOC<W
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3iJ4VL7
tdc.SelectObject(pOld); +'Pf|S
BITMAP btm; #GT/Q3{C
bm.GetBitmap(&btm); J,%v`A ~N
DWORD size=btm.bmWidthBytes*btm.bmHeight; -("sp
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !"j?dQ.U;
BITMAPINFOHEADER bih; u.x>::i&
bih.biBitCount=btm.bmBitsPixel; p)RASIB
bih.biClrImportant=0; .Ebg>j:\
bih.biClrUsed=0; AK%`EsI^
bih.biCompression=0; ?<bByxa
bih.biHeight=btm.bmHeight; SwpS6
bih.biPlanes=1; g"c\ouSY
bih.biSize=sizeof(BITMAPINFOHEADER); xX*I.saK
bih.biSizeImage=size; Hly2{hokq
bih.biWidth=btm.bmWidth; @~hiL(IR'
bih.biXPelsPerMeter=0; j[k&O)A{C
bih.biYPelsPerMeter=0; A
'rfoA6
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2Kovvh y#
static int filecount=0; (4o_\&
CString name; wP8Wx~Q=
name.Format("pict%04d.bmp",filecount++); Pqli3(
name=m_Path+name; vmm#UjwF3
BITMAPFILEHEADER bfh; B ZP}0
bfh.bfReserved1=bfh.bfReserved2=0; pZUckQ
bfh.bfType=((WORD)('M'<< 8)|'B'); [Nbs{f^J=
bfh.bfSize=54+size; vx62u29m
bfh.bfOffBits=54; |RS9N_eRt
CFile bf; Pky/fF7e
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A^nB!veh
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "bZ%1)+
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <]xGd!x$
bf.WriteHuge(lpData,size); rrbD0UzFA
bf.Close(); A-x; ai]
nCount++; SDt)|s
} XFKe6:
GlobalFreePtr(lpData); s.`:9nj
if(nCount==1) GcaLP*%>B
m_Number.Format("%d picture captured.",nCount); e=&,jg?K
else FOVghq@
m_Number.Format("%d pictures captured.",nCount); n4\UoKq
UpdateData(FALSE); d"o5uo
}
2%P{fJbwd
EK`}?>'
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S^(OjS
{ "TEF
if(pMsg -> message == WM_KEYDOWN) "`HkAW4GZa
{ dJxdrs
if(pMsg -> wParam == VK_ESCAPE) n]:Xmi8p
return TRUE; `Cq&;-u
if(pMsg -> wParam == VK_RETURN) +9Q,[)e r
return TRUE; 36"-cGNr{
} HR'sMu3
return CDialog::PreTranslateMessage(pMsg); -i93
} GPV=(}z
!Q[j;f
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %PA#x36
{ hK^(Y
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'kU5
SaveBmp(); SFqY*:svOw
return FALSE; )1?#q[x
} 'kBg3E$y
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )&/ecx"2Q
CMenu pop; 4^uQB(}Z
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F(h
jP
CMenu*pMenu=pop.GetSubMenu(0); EPeKg{w
pMenu->SetDefaultItem(ID_EXITICON); yuP1*QJ%
CPoint pt; 709/'#- ^
GetCursorPos(&pt); - t#YL
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *G rYB6MT
if(id==ID_EXITICON) V[DiN~H
DeleteIcon(); B|WM;Y^
else if(id==ID_EXIT) H@,h$$
OnCancel(); ^mwS6WH6
return FALSE; pW&K=,7|
} qAI%6d
LRESULT res= CDialog::WindowProc(message, wParam, lParam); T'6MAxEZUq
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) zTBf.A;e7
AddIcon(); /EP
RgRX
return res; *Aqd["q
} L(RI4d
W kP`qD3
void CCaptureDlg::AddIcon() trx y3k;
{ ?Vre"6U
NOTIFYICONDATA data; [D%(Y
~2
data.cbSize=sizeof(NOTIFYICONDATA); ^(F@ #zN}
CString tip; 76oJCNY
tip.LoadString(IDS_ICONTIP); s5s'[<
data.hIcon=GetIcon(0); -v %n@8p
data.hWnd=GetSafeHwnd(); px${
"K<
strcpy(data.szTip,tip); .9NYa |+0
data.uCallbackMessage=IDM_SHELL; n2A
;
`=
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l+nT$IPF
data.uID=98; wn-1fz<d
Shell_NotifyIcon(NIM_ADD,&data); *Jwx,wF}4
ShowWindow(SW_HIDE); ldFR%v>9
bTray=TRUE; zgNzdO/B
} =;Q:z^S
3xIelTf*
void CCaptureDlg::DeleteIcon() /7N&4FrG
{ }3O 0nab
NOTIFYICONDATA data; qdnwaJ;&
data.cbSize=sizeof(NOTIFYICONDATA); &J?:wC=E
data.hWnd=GetSafeHwnd(); /hN;\Z[@
data.uID=98; v<3KxP'a
Shell_NotifyIcon(NIM_DELETE,&data); =h\unQ1T
ShowWindow(SW_SHOW); 'MgYSP<
SetForegroundWindow(); c/DK31K
ShowWindow(SW_SHOWNORMAL); O!G!Gq&
bTray=FALSE; zm!M'|~@7
} 4`e[gvh
xyD2<?dGUb
void CCaptureDlg::OnChange() S=<OS2W7+r
{ EVlj#~mV
RegisterHotkey(); s_;o1 K0
} k{F]^VXQ
5,R4:y ?cK
BOOL CCaptureDlg::RegisterHotkey() ?}e^-//*i
{ [XE\2Qa8e
UpdateData(); `r'$l<(4WV
UCHAR mask=0; =`ZRPA!aY
UCHAR key=0; nIr:a|}[
if(m_bControl) s*Nb=v.e9
mask|=4; bj6;>Ezp3(
if(m_bAlt) )+Y"4?z~
mask|=2; H+{@VB
if(m_bShift) hd*GDjmRQ/
mask|=1; t6uYFxE
key=Key_Table[m_Key.GetCurSel()]; ds2%i
if(bRegistered){ ZkJLq[:cM
DeleteHotkey(GetSafeHwnd(),cKey,cMask); VqUCcT
bRegistered=FALSE; PI.Zd1r
} QWc,JCu
cMask=mask; KKq%'y)u^
cKey=key; $cWt^B'
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %*NED zy
return bRegistered; ff;~k?L
} P;`Awp?
D 0Mxl?S?
四、小结 &,P; 7 R
]Twyj
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。