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:
42b. 7E
u:_sTfKm& 一、实现方法
[NHg&R H RDUT3H6~ 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:
e1^fUOS E:08%4O #pragma data_seg("shareddata")
ad"'O] HHOOK hHook =NULL; //钩子句柄
vC)"*wYB{ UINT nHookCount =0; //挂接的程序数目
X}zX`]:I' static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Pv< QjY static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
M0cd-Dn static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
~A^E static int KeyCount =0;
G;2R]H#p static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-Nsk}Rnk* #pragma data_seg()
mSU@UD|' C-Nuy1o 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。
SV$nyV
qq
OxTG] DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
fA"<MslKLK \bU` BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Qo'yS"g<9) cKey,UCHAR cMask)
! G*&4V3Mg {
f=t:[<
) BOOL bAdded=FALSE;
7)B&(2D& for(int index=0;index<MAX_KEY;index++){
x1t{SQ-C if(hCallWnd[index]==0){
ctp?y hCallWnd[index]=hWnd;
{/-y>sm HotKey[index]=cKey;
mbF(tSy HotKeyMask[index]=cMask;
rei
8LW bAdded=TRUE;
dX_!0E[c KeyCount++;
L<bYRGz break;
J"diFz+20 }
( V$Zc0 }
9 0X?1 return bAdded;
t";{1. }
'#O;mBPNi //删除热键
bAdiA2VF' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
z<a$q3!# {
W0Ktw6 BOOL bRemoved=FALSE;
(jMtN?&0H- for(int index=0;index<MAX_KEY;index++){
-M6L.gi)oJ if(hCallWnd[index]==hWnd){
tC^ 1} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
C`dkD0_ hCallWnd[index]=NULL;
( : HotKey[index]=0;
B9YsA?hg HotKeyMask[index]=0;
BY3bpR bRemoved=TRUE;
*dN N< KeyCount--;
q^5yk=2fq break;
X` ATH^S }
uaiz*Im }
|z:Q(d06 }
@!e~G'j%VD return bRemoved;
#;`Oj }
27m@|M] R W$r^ @c Z\*,T DLL中的钩子函数如下:
fO6[!M( xPt*CB LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
G%S6$@: {
/?Vdqci BOOL bProcessed=FALSE;
bMsECA& if(HC_ACTION==nCode)
8q0I:SJy {
~F;CE"3A if((lParam&0xc0000000)==0xc0000000){// 有键松开
?KCivf switch(wParam)
=ai2z2z {
N&"QKd l case VK_MENU:
W@^J6sH MaskBits&=~ALTBIT;
O16r!6=-n break;
>:2}V]/; case VK_CONTROL:
$0#6"urG MaskBits&=~CTRLBIT;
P'sfi>A break;
s
D_G)c case VK_SHIFT:
E4r.ky`#~ MaskBits&=~SHIFTBIT;
I FsE!oDs4 break;
ur6e&bTp default: //judge the key and send message
#,&8& break;
]BfS270 }
-^Xy% for(int index=0;index<MAX_KEY;index++){
UgC)7
K1 if(hCallWnd[index]==NULL)
.Rvf/-e continue;
}S */b1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
c_#*mA"+ {
Rv<L#!;
t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
><=rIhG%H@ bProcessed=TRUE;
}z
wX }
Yrxk Kw# }
LKx` v90p }
fJy)STQ4 else if((lParam&0xc000ffff)==1){ //有键按下
:k~dj C switch(wParam)
:=9< {
MGQ,\55" case VK_MENU:
+< yhcSSTB MaskBits|=ALTBIT;
y@3Q;~l, break;
ePEe?o4; case VK_CONTROL:
9/@ &* MaskBits|=CTRLBIT;
paWxanSt break;
[/cIUQ case VK_SHIFT:
.xl.P7@JJ MaskBits|=SHIFTBIT;
i6Qb[\; break;
T#@{G,N default: //judge the key and send message
zT7"VbP break;
(~&w-w3 }
O#EqG.L5 for(int index=0;index<MAX_KEY;index++){
:H?f*aw if(hCallWnd[index]==NULL)
:3^dF}> continue;
p x#suy if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#Ao !>qCE {
1[-vD= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9Kbw
GmSU bProcessed=TRUE;
Lc]1$ }
2JZdw }
g*y/j] }
z]=8eV\ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
"Zcu[2, for(int index=0;index<MAX_KEY;index++){
1`JB)9P if(hCallWnd[index]==NULL)
3+(z_!Qh continue;
^"x<)@X if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$7NCb7%/L SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
*~2cG;B"e //lParam的意义可看MSDN中WM_KEYDOWN部分
;7Okyj6EP }
uw33:G }
51 4Z<omrK }
mb1Vu return CallNextHookEx( hHook, nCode, wParam, lParam );
MQ` %`` }
HCj>,^<h (.?ZKL 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:
^m%52Tm
h O~PChUU*Y BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
8sg|MWSU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Fp%Ln(/m V_"f|[1 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:Jbt@R<n S!hXf|*0[ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%dW%o{ {
|4mVT&63( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
"3}<8c {
TH4\HY9qa? //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
(0L=AxH SaveBmp();
68e[:wf return FALSE;
[T^?Q%h }
dJD(\a>r.u …… //其它处理及默认处理
&|
!B!eOY }
iZxt/}1X0 1nI^-aQ3 3^wC<ZXcD 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。
BzN@gQo {C")#m-0 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。
rN5tI.iC q3h'l, 二、编程步骤
BBnq_w"a 7-*=|gl+ 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";
+,5-qm)Gh> %
frfSGf.# 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Sh&PNJ-* ho.(v;
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;
a#[-*ou` 3FNT|QF 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;
=Op+v" (D7$$!} 5、 添加代码,编译运行程序。
#;Tz[0 )`+YCCa6F 三、程序代码
pe.QiMW{8 <f>akT,W ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
M%`\P\A #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
E[g*O5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
QlEd6^& #if _MSC_VER > 1000
vH[Pb#f- #pragma once
{mTytT #endif // _MSC_VER > 1000
7L3ik;> #ifndef __AFXWIN_H__
;Ii1B{W #error include 'stdafx.h' before including this file for PCH
_#C()Ro*P #endif
%j+xgX/& #include "resource.h" // main symbols
:P+\p= class CHookApp : public CWinApp
%J~WC$=Qv {
p&Ed\aQ%z; public:
_O]xey^r CHookApp();
7%;_kFRV // Overrides
p2% // ClassWizard generated virtual function overrides
ig+4S[L~n //{{AFX_VIRTUAL(CHookApp)
[[+ pMI public:
+TJEG?o virtual BOOL InitInstance();
igC_)C^i> virtual int ExitInstance();
c#cx>wq9 //}}AFX_VIRTUAL
EWjgI_- //{{AFX_MSG(CHookApp)
"%6/a7S // NOTE - the ClassWizard will add and remove member functions here.
V/%~F6e // DO NOT EDIT what you see in these blocks of generated code !
L'Q<>{;Ig //}}AFX_MSG
=,V|OfW DECLARE_MESSAGE_MAP()
v=?2S };
5@!st LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
-e]7n*}H$ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z#6?8y2- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
IV `%V+
f BOOL InitHotkey();
D(]E/k@;~ BOOL UnInit();
ytAWOt}` #endif
\6!W05[ Q p $`92Be/ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*>[3I}mM #include "stdafx.h"
]!
*[Q\ #include "hook.h"
~nY]o"8D #include <windowsx.h>
}q[Bd #ifdef _DEBUG
>BVoHt~; #define new DEBUG_NEW
'{b1!nC; #undef THIS_FILE
s60
TxB static char THIS_FILE[] = __FILE__;
>I"V],d!6 #endif
q_[G1&MC #define MAX_KEY 100
5&!c7$K0 #define CTRLBIT 0x04
{XCf-{a]~ #define ALTBIT 0x02
gm)@c2?. #define SHIFTBIT 0x01
G}nO@ #pragma data_seg("shareddata")
#0Ds'pE- HHOOK hHook =NULL;
9Ul(GI( UINT nHookCount =0;
yxWO[ Z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
4JyM7ePND} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
%;"@Ah static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
9jir*UI static int KeyCount =0;
SPkn3D6 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ipE]}0q #pragma data_seg()
{KL5GowH HINSTANCE hins;
*%5{' void VerifyWindow();
%;xOB^H^ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
~@W*r5/ //{{AFX_MSG_MAP(CHookApp)
p{$p
$/A // NOTE - the ClassWizard will add and remove mapping macros here.
F>hZ{ // DO NOT EDIT what you see in these blocks of generated code!
0Q5^C!K //}}AFX_MSG_MAP
yYZxLJ=' END_MESSAGE_MAP()
x.mrCJn) u9qMqeF CHookApp::CHookApp()
w n|]{Ww35 {
""iaGH+Cxw // TODO: add construction code here,
Vr.Y/3N&' // Place all significant initialization in InitInstance
zg)sd1@ }
x2Lq=zwJ eOT+'[3" CHookApp theApp;
s%4M$e LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qQ]]~F {
]; $] G- BOOL bProcessed=FALSE;
C#0Qd% if(HC_ACTION==nCode)
Ah69
_>N`S {
q8P.,%
if((lParam&0xc0000000)==0xc0000000){// Key up
7V7zGx+Z7 switch(wParam)
5s{j=.O {
;]2s,za)qs case VK_MENU:
SkQswH MaskBits&=~ALTBIT;
,F6=b/eZ break;
pc]J[ S?P case VK_CONTROL:
sBX-X$*N MaskBits&=~CTRLBIT;
^Q<mV*~ break;
]b?9zeT*'l case VK_SHIFT:
@C_KV0i MaskBits&=~SHIFTBIT;
ZJW[?V\5= break;
>/$Fh:R- default: //judge the key and send message
e.d
#wyeX break;
-e GL) M }
W!Gdf^Yy< for(int index=0;index<MAX_KEY;index++){
$tqJ/:I if(hCallWnd[index]==NULL)
T#@lDpO continue;
y[};J
vk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
dq;|?ESP {
xgu `Q`~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ENVk{QE! bProcessed=TRUE;
#18 FA| }
d~J-|yyT }
OWp%v_y] }
B5%n(,Lx else if((lParam&0xc000ffff)==1){ //Key down
<6TT)t<h switch(wParam)
2-*V=El {
q/9H..6 case VK_MENU:
T=f|,sK +7 MaskBits|=ALTBIT;
Jb_1LZ)] break;
`O?T.p) case VK_CONTROL:
Uh
eC MaskBits|=CTRLBIT;
oTjyN\?H break;
2NGeC0= case VK_SHIFT:
E_z;s3AXQ MaskBits|=SHIFTBIT;
uQ$^;Pr break;
#65^w=Sp} default: //judge the key and send message
?
8aaD>OR$ break;
/wShUR{ }
~T7B$$ for(int index=0;index<MAX_KEY;index++)
WUc#)EEM) {
NH<gU_s8{9 if(hCallWnd[index]==NULL)
./vZe_o)j$ continue;
AFvgbn8Qh if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4LcX<BU9 {
RprKm'b8x` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
2zSG&",2D bProcessed=TRUE;
o Pci66 }
8F(h*e_? }
C;+(Zp }
uP3_FX:
e if(!bProcessed){
^)!F9h+ for(int index=0;index<MAX_KEY;index++){
w>fdQ!RdP if(hCallWnd[index]==NULL)
/PBaIoJE continue;
~[o4a ' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}T^cEfX SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
=;a!u }
Di_2Plo)4 }
7tM9u5FF }
EJ}!F?o return CallNextHookEx( hHook, nCode, wParam, lParam );
g>0XxjP4 }
B$3 ?K gJiK+&8I BOOL InitHotkey()
-$VZtex {
?^mi3VM if(hHook!=NULL){
`nXVE+E@ nHookCount++;
/^{BUo return TRUE;
7\zZpPDV }
JCcZuwu[ else
9fnA hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
#o/H~Iv if(hHook!=NULL)
qW:)!z3\ nHookCount++;
keW~ NM return (hHook!=NULL);
PP~rn fE }
-4rDbDsr BOOL UnInit()
kd:$oS_*s {
1be %G [* if(nHookCount>1){
{CG_P,FO nHookCount--;
3nZ9m return TRUE;
aJL^AG }
AsS$C&^ BOOL unhooked = UnhookWindowsHookEx(hHook);
5
8-e^. if(unhooked==TRUE){
f %lD08Sl nHookCount=0;
W6T|iZoV"r hHook=NULL;
"vYE+ }
/yz=Cj oz return unhooked;
UtB6V)YI }
Rgo rkZlVM l\AMl
\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.?p\n7 {
/&& 2u7* BOOL bAdded=FALSE;
P7ph}mB for(int index=0;index<MAX_KEY;index++){
etT + if(hCallWnd[index]==0){
H.<a`mm8 hCallWnd[index]=hWnd;
e~ aqaY~} HotKey[index]=cKey;
JjpRHw8\ HotKeyMask[index]=cMask;
n%R;-?*v bAdded=TRUE;
FlfI9mm KeyCount++;
zl-2$}<a break;
cfox7FmW }
K3uG2g(>2 }
oRKEJNps return bAdded;
KIA 2"KbjG }
jV#ahNq; n?\ nn3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`nKH"TaX {
&R|/t:DN BOOL bRemoved=FALSE;
fP
tm0.r for(int index=0;index<MAX_KEY;index++){
>-_d CNZ if(hCallWnd[index]==hWnd){
nVu&/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
f)c~cJz<q hCallWnd[index]=NULL;
Q$obOEr2( HotKey[index]=0;
)%SkJ HotKeyMask[index]=0;
x:vu'A bRemoved=TRUE;
/(.6bv KeyCount--;
rhpPCt break;
zWpqJK }
GU't%[ }
jztq.2-c# }
9jN)I(^D6 return bRemoved;
R(P%Csbqh }
xvzr:pP -yGDh+- void VerifyWindow()
,*4p?|A {
{GvTfZfp for(int i=0;i<MAX_KEY;i++){
V._6=ZJ if(hCallWnd
!=NULL){ "G-1>:
if(!IsWindow(hCallWnd)){ aK,z}l(N
hCallWnd=NULL; gH2,\z`[4
HotKey=0; <9=9b_z
HotKeyMask=0; {QBB^px
KeyCount--; x}U8zt)yD3
} ze_{=Cv&Y
} j-CnT)W<
} Ngr/QL]Q
} VIP7OHJh
*Ype>x{
BOOL CHookApp::InitInstance() @)kO=E d
{ DjU9
uZT
AFX_MANAGE_STATE(AfxGetStaticModuleState()); SVjl~U-^
hins=AfxGetInstanceHandle(); Xi?b]Z
InitHotkey(); 22kp l)vbU
return CWinApp::InitInstance(); 2,lqsd:xM
} "#v=IJy&r
vHAg-Avc
int CHookApp::ExitInstance() \BWykA>
{ j1SMeDDM
~
VerifyWindow(); k5kdCC0FCk
UnInit(); -(`OcGM'L
return CWinApp::ExitInstance(); L=2y57&Y
} QDpEb=|S
as=m`DqOh
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?[*0+h`en
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9Rek4<5
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ iX'rU@C
#if _MSC_VER > 1000 Lokl2o`
#pragma once '(f/~"9B
#endif // _MSC_VER > 1000 x^"ES%*
Ladsw
class CCaptureDlg : public CDialog Xtwun
{ ^QuiH'
// Construction g}p;\o
public: p8s:g~ W
BOOL bTray; Z/^ u
BOOL bRegistered; ]"c+sMW
BOOL RegisterHotkey(); h^
-.]Y
UCHAR cKey; "NRDNqj(
UCHAR cMask; !6Sd(2
void DeleteIcon(); !*2%"H*
void AddIcon(); dd?x(,"A`
UINT nCount; 0y&I/2
void SaveBmp(); 8/z3=O&
CCaptureDlg(CWnd* pParent = NULL); // standard constructor SuZ&vqS
// Dialog Data Z):n c% S
//{{AFX_DATA(CCaptureDlg) R3k1RE2c&g
enum { IDD = IDD_CAPTURE_DIALOG }; kNu'AT#3|
CComboBox m_Key; OD Ur
BOOL m_bControl; 7iJ&6=/
BOOL m_bAlt; j@Yi`a(sdm
BOOL m_bShift; 0
ugT2%
CString m_Path; FWH}j0Gj|
CString m_Number; <p;k)S2J
//}}AFX_DATA mDh1>>K'~
// ClassWizard generated virtual function overrides rF\"w0J_
//{{AFX_VIRTUAL(CCaptureDlg) =8gHS[
public: zI~owK)%Z
virtual BOOL PreTranslateMessage(MSG* pMsg); C"lJl k9g^
protected: !_2n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `OymAyEYQ
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~}K5#<
//}}AFX_VIRTUAL 8q`$y$06Dk
// Implementation ^-FRTC
protected: |[9?ma
HICON m_hIcon; &C>/L;
// Generated message map functions 6<0n *&
//{{AFX_MSG(CCaptureDlg) ;n\= R 5.
virtual BOOL OnInitDialog(); Y!6/[<r$~k
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s4_/&h
afx_msg void OnPaint(); N_L,]QT?
afx_msg HCURSOR OnQueryDragIcon(); p!Eft/A(
virtual void OnCancel(); vzF5xp.
afx_msg void OnAbout(); rbT)=-(
afx_msg void OnBrowse(); p;?*}xa
afx_msg void OnChange(); d--y
//}}AFX_MSG x.1-)\
DECLARE_MESSAGE_MAP() !ZDzEP*
}; m\/ Tj0e
#endif : S$l"wrh\
Yxv9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file = 07Gy, =i
#include "stdafx.h" (;VVCAoy
#include "Capture.h" {brMqE>P#
#include "CaptureDlg.h" &'l>rD^o
#include <windowsx.h> -T6(hT\
#pragma comment(lib,"hook.lib") CIjZG ?A
#ifdef _DEBUG 'WHHc 9rG,
#define new DEBUG_NEW 8@NH%zWBp
#undef THIS_FILE :Q+5,v-c
static char THIS_FILE[] = __FILE__; I ];M7
#endif ylKmj]A
#define IDM_SHELL WM_USER+1 9+,R`v
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t6c<kIQ:-O
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v){ .Z^_C
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Nr2 C@FU:0
class CAboutDlg : public CDialog RFh"&0[
{ rQTr8DYH
public: /yLZ/<WN
CAboutDlg(); 6 \B0^
// Dialog Data \.XLcz
//{{AFX_DATA(CAboutDlg) 2cu#lMq
enum { IDD = IDD_ABOUTBOX }; HE<1v@jW
//}}AFX_DATA ,:+dg(\r
// ClassWizard generated virtual function overrides Ld^GV
//{{AFX_VIRTUAL(CAboutDlg) ]4+s$rG
protected: PL{Q!QJK'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BQ^H? jo
//}}AFX_VIRTUAL JO14KY*%
// Implementation 7^}Ll@
protected: /S:F)MO9
//{{AFX_MSG(CAboutDlg) yBLK$@9
//}}AFX_MSG 7=@jARW&
DECLARE_MESSAGE_MAP() )pw&c_x
}; *%Qn{x
bbxLBD'
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .I3?7
{ bYe;b><G
//{{AFX_DATA_INIT(CAboutDlg) 2/,0iwj-
//}}AFX_DATA_INIT 2tayP@$
} \b[9ebME
)a}"^1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \U%#nU{
{ %iJ%{{f`
CDialog::DoDataExchange(pDX); (2?G:+C 7
//{{AFX_DATA_MAP(CAboutDlg) ozsxXBh-`'
//}}AFX_DATA_MAP z}SND9-"
} PLM _#+R>
xr0haN\p"
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9*6]&:fm
//{{AFX_MSG_MAP(CAboutDlg) \qsw"B*tv`
// No message handlers dBO@6*N4c
//}}AFX_MSG_MAP VC5_v62&.
END_MESSAGE_MAP() KlK`;cr?
U=bEA1*@0
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eMK+X \
: CDialog(CCaptureDlg::IDD, pParent) TG
n-7 88
{ VcK}2<8:+~
//{{AFX_DATA_INIT(CCaptureDlg) v+6@cC
m_bControl = FALSE; N__H*yP
m_bAlt = FALSE; 0"pVT%b
m_bShift = FALSE; _Fp>F
m_Path = _T("c:\\"); OPpjuIRv
m_Number = _T("0 picture captured."); DjMf,wX-{
nCount=0; (Lh#`L?x
bRegistered=FALSE; s!/TU{8J
bTray=FALSE; I[o*RKT'"
//}}AFX_DATA_INIT ctQbp~-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DOm[*1@^
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); u%2<\:~j
} ]L2Oz
elJ)4Em
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9ykM3
{ 0;sRJ
CDialog::DoDataExchange(pDX); 8GJdRL(
//{{AFX_DATA_MAP(CCaptureDlg) .AV)'j#6P
DDX_Control(pDX, IDC_KEY, m_Key); a:SQ16_?
DDX_Check(pDX, IDC_CONTROL, m_bControl); Z: 2I/
DDX_Check(pDX, IDC_ALT, m_bAlt); QbYc[8-[
DDX_Check(pDX, IDC_SHIFT, m_bShift); /Tz85 [%6
DDX_Text(pDX, IDC_PATH, m_Path); `n!viW|tB
DDX_Text(pDX, IDC_NUMBER, m_Number); '%v#v 3'
//}}AFX_DATA_MAP QGiAW7b5
} c*\<,n_
b7C
e%Br
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) U7&x rif
//{{AFX_MSG_MAP(CCaptureDlg) "rXOsX\;
ON_WM_SYSCOMMAND() ;??ohA"{5
ON_WM_PAINT() ps1YQ3Ep&
ON_WM_QUERYDRAGICON() ;D ~L|
ON_BN_CLICKED(ID_ABOUT, OnAbout) lfk9+)
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) n)8Yj/5
ON_BN_CLICKED(ID_CHANGE, OnChange) D-9\~gvh
//}}AFX_MSG_MAP [n,?WwC
END_MESSAGE_MAP() iNcZ)m/
5IVksg
BOOL CCaptureDlg::OnInitDialog() :lcea6iO
{ E]^5I3=O
CDialog::OnInitDialog(); ]kktoP|D
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B%<e FFV\
ASSERT(IDM_ABOUTBOX < 0xF000); "oJ(J{Jat
CMenu* pSysMenu = GetSystemMenu(FALSE); eR']#Q46{T
if (pSysMenu != NULL) HN5W@5m:
.
{ mkvvNm3
CString strAboutMenu; hJ%1
strAboutMenu.LoadString(IDS_ABOUTBOX); h
-_&MD/J
if (!strAboutMenu.IsEmpty()) (J:dK=O@Z
{ ic6L9>[
pSysMenu->AppendMenu(MF_SEPARATOR); $%2_{m_K:p
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h~HB0^|
} ~QG?k
} fF?6j
SetIcon(m_hIcon, TRUE); // Set big icon >AD=31lq
SetIcon(m_hIcon, FALSE); // Set small icon #?}6t~
m_Key.SetCurSel(0); ed~R>F>
RegisterHotkey(); "i'bTVs
CMenu* pMenu=GetSystemMenu(FALSE); DrS~lTf=>
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M\/XP| 7
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Qqs"?Z,P
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?`sy%G
return TRUE; // return TRUE unless you set the focus to a control k/&]KYwu
} P1 +"v*
_rQUE^9
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #,f{Ok+
{ 7u11&(Lz
if ((nID & 0xFFF0) == IDM_ABOUTBOX) vg%QXaM
{ V:K;] h*!
CAboutDlg dlgAbout; hsce:TB
dlgAbout.DoModal(); =7[)'
} .e[Tu|qo
else eVy2|n9rH
{ ft5DU/%
CDialog::OnSysCommand(nID, lParam); f|0lj
} )@QJ
} " mj^+u-
m$UvFP1>u1
void CCaptureDlg::OnPaint() Y'm=etE
{ H~+xB1
if (IsIconic()) * UcjQ
{ eO5ktEoJ
CPaintDC dc(this); // device context for painting \tt'm\_
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); SPy3~Db-o
// Center icon in client rectangle Zy$L rr!
int cxIcon = GetSystemMetrics(SM_CXICON); 2PC5^Ni/9@
int cyIcon = GetSystemMetrics(SM_CYICON); \d68-JS@~
CRect rect; p,#6
@*
GetClientRect(&rect); ;"7/@&M\m
int x = (rect.Width() - cxIcon + 1) / 2; ^KHLBSc:
int y = (rect.Height() - cyIcon + 1) / 2; -Q[g/%
// Draw the icon 9{J?HFw*;
dc.DrawIcon(x, y, m_hIcon); w$Ux?y-L
} to3?$-L
else 1 tfYsg=O
{ Ygj6(2
CDialog::OnPaint(); 3A0_C?E
} fp !:u
} AqYxWk3>
X\2_;zwf
HCURSOR CCaptureDlg::OnQueryDragIcon() @@pq'iRn
{ \XH@b6{
return (HCURSOR) m_hIcon; VyZV(k
} +t\^(SJ6
sWxK~Yg
void CCaptureDlg::OnCancel() mY2:m(9"5
{ b :\D\X
if(bTray) P.4E{.)(
DeleteIcon(); g^lFML|
%
CDialog::OnCancel(); .j 'wQ+_
} w!,QxrOV~
J%P)%yX
void CCaptureDlg::OnAbout() S=9E@(]
{ b~wKF0vq
CAboutDlg dlg; 'C]jwxy
dlg.DoModal(); fGO*%)
} zeOb Aw1O
>}]H;&
l
void CCaptureDlg::OnBrowse()
U1\MA6pXW
{ 9+VF<;Xw
CString str; !LSs9_w
BROWSEINFO bi; Q_lu`F|
char name[MAX_PATH]; ?[SVqj2-
ZeroMemory(&bi,sizeof(BROWSEINFO)); ./iXyta
bi.hwndOwner=GetSafeHwnd(); 9eSRCLhgD
bi.pszDisplayName=name; /RF%1!M
K
bi.lpszTitle="Select folder"; 1M+Zkak7p
bi.ulFlags=BIF_RETURNONLYFSDIRS; NhlJ3/J j
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5ZsDgOeY
if(idl==NULL) Sr7@ buF
return; m!!;/e?yx
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); wiV&xl
str.ReleaseBuffer(); 5Fe-=BX(
m_Path=str; Qx.jCy@
if(str.GetAt(str.GetLength()-1)!='\\') 4!'1/3cY
m_Path+="\\"; $MT}l
UpdateData(FALSE);
kgc.8
} pGk"3.ce
eiB(VOJ
void CCaptureDlg::SaveBmp() Q<'@V@H
{ 03"#J2b
CDC dc; \(9p&"Q-
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3;D?|E]1
CBitmap bm; "o==4?*L
int Width=GetSystemMetrics(SM_CXSCREEN); $~hdm$
int Height=GetSystemMetrics(SM_CYSCREEN); E3tj/4:L
bm.CreateCompatibleBitmap(&dc,Width,Height); '}zT1F*
p=
CDC tdc; *^6k[3VY
tdc.CreateCompatibleDC(&dc); nOuN|q=C
CBitmap*pOld=tdc.SelectObject(&bm); TAAR'Jz S
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >C^/,/%v
tdc.SelectObject(pOld); 0#
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BITMAP btm; P%jkKE?B4
bm.GetBitmap(&btm); [Yoa"K
DWORD size=btm.bmWidthBytes*btm.bmHeight; Ltg-w\?]
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !h/dZ`#
BITMAPINFOHEADER bih; pP
oxVvG{
bih.biBitCount=btm.bmBitsPixel; }wG|%Y#+r
bih.biClrImportant=0;
u;(K34!)
bih.biClrUsed=0; VS%@)sI|Z
bih.biCompression=0; hs,5LV)|y
bih.biHeight=btm.bmHeight; r&/D~g\"|[
bih.biPlanes=1; Si[eAAd'
:
bih.biSize=sizeof(BITMAPINFOHEADER); $l43>e{E
bih.biSizeImage=size; hgif]?:C<
bih.biWidth=btm.bmWidth; af^@
.$
|
bih.biXPelsPerMeter=0; Yoe les-
bih.biYPelsPerMeter=0; nO:HB.&@
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); CH#kvR2
static int filecount=0; ZK!4>OuH`
CString name; y8D 8Y8B
name.Format("pict%04d.bmp",filecount++); >+f'!*%7He
name=m_Path+name; F]Pul|.l
BITMAPFILEHEADER bfh; lk~dgky@
bfh.bfReserved1=bfh.bfReserved2=0; q"l>`KCG`
bfh.bfType=((WORD)('M'<< 8)|'B'); HMQ'b(a'
bfh.bfSize=54+size; {'&8`d
bfh.bfOffBits=54; (A|B@a!Y>
CFile bf; o:f|zf>
i<
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {;;eOxOP|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \hu':@}
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8}J(c=4Gk
bf.WriteHuge(lpData,size); i!y\WaCp
bf.Close(); d^_itC;-,
nCount++; f0g6g!&gf
} @Z,qu2~|!
GlobalFreePtr(lpData); (OQi%/Oy
if(nCount==1) q>c+bo
6
m_Number.Format("%d picture captured.",nCount); h#;?9DP
else [I_BCf
m_Number.Format("%d pictures captured.",nCount); &7lk2Q\
UpdateData(FALSE); {MA@A5
} =cknE=
m_~y
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9PWm@
Nlf
{ u`nt\OF
if(pMsg -> message == WM_KEYDOWN) EqYz,%I%
{ 0.3^
if(pMsg -> wParam == VK_ESCAPE) a?l_-Fi
return TRUE; !HbqbS22
if(pMsg -> wParam == VK_RETURN) *di&%&f
return TRUE; .;cxhgU
} <&*#famX
return CDialog::PreTranslateMessage(pMsg); &boj$ k!g[
} i<0D
Z_rub
o<~-k,{5P
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /1H9z`qV
{ rn[$x(G
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,WzG.3^m
SaveBmp(); `s#sE.=o
return FALSE; ]9dx3<2_I
} t4C<#nfo
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <[esA9.]t
CMenu pop; G!-7ic_4
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Hs.6;|0%
CMenu*pMenu=pop.GetSubMenu(0); p`pg5R
pMenu->SetDefaultItem(ID_EXITICON); MP_A<F
CPoint pt; |2[S/8g!
GetCursorPos(&pt); )Fw
@afE~
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Dg1kbO=2
if(id==ID_EXITICON) :Xh_$4~^Y
DeleteIcon(); Q|6Ls$'$
else if(id==ID_EXIT) =I
%g;YK
OnCancel(); z0=Rp0_W
return FALSE; rwasH,+
} S a(yjF1
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ks9FnDm8
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 'nC3:U
AddIcon(); wE-Ji<1HJ
return res; O-y6!u$6&
} qr7 X-[&
>Iu]T{QNO
void CCaptureDlg::AddIcon() u4`mQ6
{ +R3\cRM
NOTIFYICONDATA data; 3(cU)
data.cbSize=sizeof(NOTIFYICONDATA); A%.J%[MVz
CString tip; K'a#M g
tip.LoadString(IDS_ICONTIP); 'Wo?%n
data.hIcon=GetIcon(0); ocb%&m;i
data.hWnd=GetSafeHwnd(); !hwzKm=%N
strcpy(data.szTip,tip); -G(3Y2
data.uCallbackMessage=IDM_SHELL; l{M;PaJ`}
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )Ix-5084
data.uID=98; @>qx:jx(-S
Shell_NotifyIcon(NIM_ADD,&data); /5L' 9e
ShowWindow(SW_HIDE); UIC\CP d
bTray=TRUE; {QIS411
} z }FiU[Hs
UrD=|-r`
void CCaptureDlg::DeleteIcon() ;PuyA
{ 8@9hU`H8l
NOTIFYICONDATA data; 6R$F =MB
data.cbSize=sizeof(NOTIFYICONDATA); Y&K<{KA\4
data.hWnd=GetSafeHwnd(); Wq=ZU\Y
data.uID=98; lGD%R'}
Shell_NotifyIcon(NIM_DELETE,&data); 1(#*'xR
ShowWindow(SW_SHOW); b#?ai3E
SetForegroundWindow(); Nb|3?c_
ShowWindow(SW_SHOWNORMAL); X|lElN
bTray=FALSE; +0oyt?
}
c4!c_a2pS
.Um?5wG~i
void CCaptureDlg::OnChange() =!1-AR%.^
{ v#FJ+
RegisterHotkey(); {<''OwQF~+
} &KOG[tv
y^EF<<\
BOOL CCaptureDlg::RegisterHotkey() 1]D/3!
{ k;"R y8[k
UpdateData(); /8P4%[\
UCHAR mask=0; >o0&:h|>$'
UCHAR key=0; !0>!tW
if(m_bControl)
L@g Q L
mask|=4; !q7;{/QM6
if(m_bAlt) w~cq%%
mask|=2; w /Bn2bD
if(m_bShift) P%<aGb4
mask|=1; m<X#W W)N
key=Key_Table[m_Key.GetCurSel()]; \Y>#^b?
if(bRegistered){ )V9Mcr*Ce6
DeleteHotkey(GetSafeHwnd(),cKey,cMask); l`~a}y "n
bRegistered=FALSE; PsF- 9&_
} @1J51< x
cMask=mask; z$I[kR%I{
cKey=key; N+C%Z[gt[
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >Rl0%!
return bRegistered; O]$*EiO\
} 6ywnyh
onWYT} c{
四、小结 pAUfG^v
+[X.-,yW
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。