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:
qXhdU/
=
k(M:#oA! 一、实现方法
y/5GY,z%aL Rw|'LaW 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:
v`{N0 R x|O^#X(, #pragma data_seg("shareddata")
gq"d$Xh$x7 HHOOK hHook =NULL; //钩子句柄
E7M_R/7@y UINT nHookCount =0; //挂接的程序数目
>,E^ R `y static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Nk<^ Qv static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+V Nk#Z i static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
aZ+><1TD static int KeyCount =0;
zgH(/@P static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
U`lK'.. #pragma data_seg()
tU5uL.( O dt^h9I2O 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。
mBE&>}G< P#,;)HF 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:
*yaS^k\ 0y6M;"&~E BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
&!OEd] cKey,UCHAR cMask)
dFF=-_O> {
,2^4"gIl BOOL bAdded=FALSE;
&w#! for(int index=0;index<MAX_KEY;index++){
c!_c, vwrn if(hCallWnd[index]==0){
?C#E_ hCallWnd[index]=hWnd;
~MBPN4r HotKey[index]=cKey;
#c5jCy}n HotKeyMask[index]=cMask;
N+h05` bAdded=TRUE;
l?=\9y KeyCount++;
jj1\oyQ8 break;
'3Lu_]I- }
8!rdqI }
ICvV}%d return bAdded;
pF4Z4?W }
u8]FJQ*\6+ //删除热键
h693TS_N BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
==& y9e {
#{vC =m73 BOOL bRemoved=FALSE;
Rd&DH_<+^ for(int index=0;index<MAX_KEY;index++){
'*`#xNu[ if(hCallWnd[index]==hWnd){
Jjm#ofv if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
bh<;px- hCallWnd[index]=NULL;
Vv45w#w; HotKey[index]=0;
!t^DN\\# HotKeyMask[index]=0;
e=WjFnK[x7 bRemoved=TRUE;
FO5a<6 KeyCount--;
REU," break;
b:D92pH }
IQRuqp KL }
v6s,lC5qR }
B*,)@h return bRemoved;
V`1,s~"q }
pL5cw= 1^4:l!0D )](ls@* DLL中的钩子函数如下:
I5_HaC>
/\c'kMAW! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
O=A2QykV( {
<;6{R#Tuh BOOL bProcessed=FALSE;
@ M]_], if(HC_ACTION==nCode)
"FWx;65CR {
,|{`(y/v
if((lParam&0xc0000000)==0xc0000000){// 有键松开
/{\ /e"5 switch(wParam)
I I+y {
l6ym <V(1p case VK_MENU:
;^5k_\ MaskBits&=~ALTBIT;
yGdX>h break;
Zgo~"G case VK_CONTROL:
eF,F<IJT{ MaskBits&=~CTRLBIT;
MLu!8dgI break;
d_,5;M^k case VK_SHIFT:
];OvV ,* MaskBits&=~SHIFTBIT;
gvA}s/ break;
-2M~KlYl default: //judge the key and send message
S^eem_C break;
x9vSekV }
G}fBd for(int index=0;index<MAX_KEY;index++){
@kWL "yy, if(hCallWnd[index]==NULL)
+e-F`k continue;
x#J9GP. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gSz<K.CT {
x9"Cm;H% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
HOR8Jwf: bProcessed=TRUE;
9{*{Ba }
P.'.KZJ:WD }
@up,5` }
L~Gr,i else if((lParam&0xc000ffff)==1){ //有键按下
#h5lz%2g switch(wParam)
DB5J3r81 {
iT>u&0B- case VK_MENU:
R}ki%i5| MaskBits|=ALTBIT;
x
b"z%.j break;
:\\NK/" case VK_CONTROL:
:&IHdf0+ MaskBits|=CTRLBIT;
jYHn J}< break;
Dfs*~H63 case VK_SHIFT:
s-$Wc)l MaskBits|=SHIFTBIT;
dFm_"135 break;
%
i4
5 default: //judge the key and send message
2.D2
o break;
ABN4kM>% }
tk&AZb,sP for(int index=0;index<MAX_KEY;index++){
;xZ+1zmL0 if(hCallWnd[index]==NULL)
_MBhwNBxZ continue;
{p +&Q| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)G/bP!^+( {
Q":_\inF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
m/KaWrw/) bProcessed=TRUE;
BNfj0e 5b }
)`DVPudiy }
HwUaaK
}
yQ$irS? if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ppyy0E^M for(int index=0;index<MAX_KEY;index++){
^M'(/O1 if(hCallWnd[index]==NULL)
{821e&r continue;
CS7b3p!I if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
u>*a@3$f SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
'J,UKK\5 //lParam的意义可看MSDN中WM_KEYDOWN部分
5/=$p:E> }
';tlV
u }
n<.7tr0f\ }
/)ZjI
W"| return CallNextHookEx( hHook, nCode, wParam, lParam );
FDMQLx f }
jHFjd' 0D(8-H 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:
OS(`H5D .z>/A/&+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
B\J[O5}, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
j&8YE7 6}^x#9\ 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:
sL$sj|" S hX.cdt_? LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
/5NWV#- {
'Z{`P0/^o` if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
kL'4m {
h`&TDB2 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^?cu9S3 SaveBmp();
yu;EL>G_AY return FALSE;
[V'c }
)Te\6qM …… //其它处理及默认处理
Tn7Mt7 h }
Y~UuT8-c `% 9Y)a/e |! 9~ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
w
<r*& +(+lbCW/ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
xV>
.] Xf4Q Lw/r 二、编程步骤
/!]K+6>u 7X$CJ%6b 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";
iC#a+G*N_M 1)z'-dQ-5$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
f(Xin3#' $H<_P'h-B 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Y=XDN: sp\6-*F 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
6tH}K ~VsN\! G 5、 添加代码,编译运行程序。
w7MRuAJ4 x1@,k=qrd 三、程序代码
>WZ.Dj0n F 'uqL+jVO ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
:` SIuu~@ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
RuHDAJ"&a #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
zA#pgX[# #if _MSC_VER > 1000
b 8@}Jv #pragma once
i+`8$uz #endif // _MSC_VER > 1000
,a5q62)q #ifndef __AFXWIN_H__
4Wl`hF #error include 'stdafx.h' before including this file for PCH
ozOc6 #endif
so` \e^d #include "resource.h" // main symbols
Xe4 class CHookApp : public CWinApp
3o rSk {
Hcf"u&% public:
gW~YB2 $ CHookApp();
s)\PY // Overrides
4-bM90&1t // ClassWizard generated virtual function overrides
eEqcAUn //{{AFX_VIRTUAL(CHookApp)
0*MUe1{ public:
w"v96%"Y virtual BOOL InitInstance();
8(? &=>@ virtual int ExitInstance();
Jq^[^ //}}AFX_VIRTUAL
M(>74(}] //{{AFX_MSG(CHookApp)
zw3I(_d[ // NOTE - the ClassWizard will add and remove member functions here.
)a^&7 // DO NOT EDIT what you see in these blocks of generated code !
2m $C;j!D //}}AFX_MSG
OdNo2SO DECLARE_MESSAGE_MAP()
Y$OE[nGi%X };
M&iXdw& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
W%rUa&00 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
O]IAIM BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
N1Y
uLG: BOOL InitHotkey();
@.L#u#
BOOL UnInit();
^C
K!=oO #endif
U R^r> DlzL(p@r //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
X}GX6qAdt #include "stdafx.h"
rw)!>j+&A #include "hook.h"
Eq_@xT0> #include <windowsx.h>
2 4od74\ #ifdef _DEBUG
Af\@J6viF7 #define new DEBUG_NEW
",~ZO<P #undef THIS_FILE
);HhV,$n static char THIS_FILE[] = __FILE__;
2H;#L`Z* #endif
p4uzw #define MAX_KEY 100
U>n[R/~] #define CTRLBIT 0x04
V'b4wO1RV #define ALTBIT 0x02
^4IJL", #define SHIFTBIT 0x01
I!!cA?W #pragma data_seg("shareddata")
WReHep HHOOK hHook =NULL;
%Ja0:e UINT nHookCount =0;
&tUX( static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
2?qT,pN static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
2a-]TVL3 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
jct=Nee| static int KeyCount =0;
odL*_<Z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
E|-oUzt #pragma data_seg()
gR/?MJ(v HINSTANCE hins;
dOaOWMrfdf void VerifyWindow();
[m! P(o BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
e>_a
( //{{AFX_MSG_MAP(CHookApp)
sC"w{_D@*4 // NOTE - the ClassWizard will add and remove mapping macros here.
6# bTlmcg // DO NOT EDIT what you see in these blocks of generated code!
otaRA //}}AFX_MSG_MAP
TQ![ END_MESSAGE_MAP()
e6*,MnqBh |Fx *,91 CHookApp::CHookApp()
xm=Gt$>.o {
sw9ri}oc // TODO: add construction code here,
6lpJ+A57# // Place all significant initialization in InitInstance
}S*]#jr& }
iYiTkq &CQ28WG X CHookApp theApp;
:/gHqEC24 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#HP-ne; # {
E#d~.#uH BOOL bProcessed=FALSE;
Ca5LLG if(HC_ACTION==nCode)
V}`ri~ {
]?V:+>t= if((lParam&0xc0000000)==0xc0000000){// Key up
07=I&Pum switch(wParam)
}x#e.}hf& {
,n%b~.$:v5 case VK_MENU:
pq_U?_5Z'r MaskBits&=~ALTBIT;
AP`1hz4].- break;
CY':'aWfa< case VK_CONTROL:
K/(QR_@? MaskBits&=~CTRLBIT;
@[v,q_^8 break;
R:l &2 case VK_SHIFT:
\(`2 @ MaskBits&=~SHIFTBIT;
Y9-F\t=~ break;
e1b?TF@lz default: //judge the key and send message
Q e/XEW break;
+P9eE,WR }
r(>812^\ for(int index=0;index<MAX_KEY;index++){
xxg/vaQt=s if(hCallWnd[index]==NULL)
o/&K>]8M continue;
gKQs:25 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
iW2\;}y {
fVZ92Xw
B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^?0'\Z bProcessed=TRUE;
W8x&:5Fc)3 }
Xhyn! &H5 }
VcsMDa }
\-Xtbm else if((lParam&0xc000ffff)==1){ //Key down
3_9CREZCl switch(wParam)
FzSL[S4i {
Oc,HnyV+ case VK_MENU:
OVxg9 MaskBits|=ALTBIT;
0$b4\.0>~ break;
UlNiH case VK_CONTROL:
b)#rUI|O MaskBits|=CTRLBIT;
s1sn,? break;
7}MnvWP case VK_SHIFT:
E`xpZ>$mPx MaskBits|=SHIFTBIT;
]1zud break;
SXe1Q8; default: //judge the key and send message
__+8wC break;
<_kA+&T }
MSBrI3MqQ for(int index=0;index<MAX_KEY;index++)
mJ(ElDG {
7;Lv_Y"b if(hCallWnd[index]==NULL)
pUqNB_ continue;
g'w"U9tjO if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"1XTgCu\ {
)/[L)-~y~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
XM"Qs.E bProcessed=TRUE;
j[mII5e7g }
|c2sJy j* }
x)Zm5&"Gg }
p{v*/<.; if(!bProcessed){
Zl'/Mxg for(int index=0;index<MAX_KEY;index++){
h-O;5.m-P if(hCallWnd[index]==NULL)
_iDVd2X"H continue;
R
i,_x if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
(GGosXU-v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(~bx % }
zN;P_@U }
!;vv-v,LQ }
3 G<4rH] return CallNextHookEx( hHook, nCode, wParam, lParam );
@PLJ)RL }
H2Z
e\c GL-b})yy BOOL InitHotkey()
}CZw'fhVWO {
JC9$"0d7 if(hHook!=NULL){
bZAL~z+ V nHookCount++;
IsJx5GO return TRUE;
PJ?C[+& }
oclU)f., else
SO STtuT hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Ahba1\,N$ if(hHook!=NULL)
_!vy|,w@e nHookCount++;
@^ti*` return (hHook!=NULL);
f52P1V] }
f9},d1k BOOL UnInit()
ux!YVvTPd {
|&
jrU-( if(nHookCount>1){
<I2ENo5? nHookCount--;
.}Xf<G& return TRUE;
G3]#Du }
Nmt~1.J BOOL unhooked = UnhookWindowsHookEx(hHook);
5a@9PX^.J if(unhooked==TRUE){
~Ma r nHookCount=0;
.m\0<8C hHook=NULL;
Wb cm1I) }
<Uj9~yVN] return unhooked;
{J/Fp# }
a]%sks u8%X~K\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h~CLJoK< {
.,#H]?Wil BOOL bAdded=FALSE;
j`$$BVZ for(int index=0;index<MAX_KEY;index++){
7Nk|9t if(hCallWnd[index]==0){
Y6)o7t hCallWnd[index]=hWnd;
bi",DKU{l HotKey[index]=cKey;
|Ox='.oIb HotKeyMask[index]=cMask;
xYW&Mfka bAdded=TRUE;
@^.W|Zh[& KeyCount++;
VlL%dN;
0 break;
QX<x2U }
[.Kp/,JY }
1kvs2 return bAdded;
#,6T. O }
u-:3C<&> T,>L BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
nfGI4ZE {
kQ lwl9 BOOL bRemoved=FALSE;
N]|>\ for(int index=0;index<MAX_KEY;index++){
cL03V? }
~ if(hCallWnd[index]==hWnd){
:{lP9%J- if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+w?R4Sxjn hCallWnd[index]=NULL;
IPYwUix HotKey[index]=0;
[2Nux0g HotKeyMask[index]=0;
s/C'f4 bRemoved=TRUE;
LGW_7&0<< KeyCount--;
&(32s! qH break;
NW 2`)e' }
^eO/?D8~h }
b.\xPb }
).(y#zJ7P return bRemoved;
*W^ZXhrZ }
r;[ =y<Yf +DR$ >a void VerifyWindow()
=Tl_~OR {
t8xXGWk0 for(int i=0;i<MAX_KEY;i++){
.PR+_a-X if(hCallWnd
!=NULL){ /T(9:1/G
if(!IsWindow(hCallWnd)){ > l0H)W
hCallWnd=NULL; #qDm)zCM
HotKey=0; !d!u{1Y&
HotKeyMask=0; pPo xx"y
KeyCount--; cgQ6b.
} y5+%8#3
} {Y Y,{H
} E0&d*BI2
} fbbbTZy
Dat',5
BOOL CHookApp::InitInstance() +0UBP7kn
{ 9:VUtx#}2
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0('ec60u
hins=AfxGetInstanceHandle(); ,J!$Q0 e
InitHotkey(); /"u37f?[^
return CWinApp::InitInstance(); Rq[d\BN0.d
} Ur>1eN%9'
2xX:Q'\2
int CHookApp::ExitInstance() ty pbwfM]
{ >X05f#c"v/
VerifyWindow(); pe+h8
UnInit(); GbL1<P$V
return CWinApp::ExitInstance(); 9jEH"`qqk
} L*A-&9.p3
$$&.}}.,
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }b&S3?ONt
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .#|?-5q/iN
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ wB \`3u4
#if _MSC_VER > 1000 b7Z o~Z
#pragma once :Ez,GA k
#endif // _MSC_VER > 1000 $#u'XyA
,bdjk(
class CCaptureDlg : public CDialog &s(&B>M
{ V8TdtGB.|h
// Construction G--X)h-
public: 15<? [`:6
BOOL bTray; OVe0{}
j
BOOL bRegistered; DyGls8<\!
BOOL RegisterHotkey(); -YKy"
UCHAR cKey; ]FTi2B{}H
UCHAR cMask; TSsZzsdr2
void DeleteIcon(); %KT}Map
void AddIcon(); c:9n8skE7
UINT nCount; Dpw*m.f
void SaveBmp(); cAEvv[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Q^rR }Ws
// Dialog Data :\His{%
//{{AFX_DATA(CCaptureDlg) %60 OS3
enum { IDD = IDD_CAPTURE_DIALOG }; 0C/ZcfFU~
CComboBox m_Key; =huV(THU
BOOL m_bControl; .)!QsBU
BOOL m_bAlt; x}?<9(nE c
BOOL m_bShift; Wx{E\ l
CString m_Path; ~:bdS 4w
CString m_Number; 'Uf?-t*LT@
//}}AFX_DATA yivu|q
// ClassWizard generated virtual function overrides &.*UVc2+Y
//{{AFX_VIRTUAL(CCaptureDlg) 4.jRTL5-oj
public: /]xa}{^B
virtual BOOL PreTranslateMessage(MSG* pMsg); )XK\[tL
protected: 4#0 3x:/<\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =ZIT!B?4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f=R+]XPzz
//}}AFX_VIRTUAL gaY&2
// Implementation i!?gga
protected: `9J9[!+!`
HICON m_hIcon; _2hLc\#
// Generated message map functions tZ9i/ =S
//{{AFX_MSG(CCaptureDlg) mSxn7LG
virtual BOOL OnInitDialog(); HN{c)DIm]
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~dRstH7u
afx_msg void OnPaint(); cA
q3Gh
afx_msg HCURSOR OnQueryDragIcon(); 0^-1d2Z~
virtual void OnCancel(); WxGD*%
afx_msg void OnAbout(); fj5g\m
afx_msg void OnBrowse(); X&qx4DL
afx_msg void OnChange(); !`Rh2g*o9
//}}AFX_MSG /;Tc]
DECLARE_MESSAGE_MAP() ([u|j
}; V;XKvH
#endif nG!<wlY14P
2Kz+COP+
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file xZ9:9/Vg
#include "stdafx.h" }bjZeh.
#include "Capture.h" ?W'p&(;
#include "CaptureDlg.h" 3N+lWuE}K
#include <windowsx.h> cj8cV|8@
#pragma comment(lib,"hook.lib") m,E$KHt (
#ifdef _DEBUG sV
#define new DEBUG_NEW .9qK88fU R
#undef THIS_FILE lZ\8W^
static char THIS_FILE[] = __FILE__; S 13cQ?4
#endif GrL{q;IO
#define IDM_SHELL WM_USER+1 ^QRg9s,T<
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |:=o\eu&
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {q?&h'#y
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; EMW6'
class CAboutDlg : public CDialog
KeQcL4<
{ YZBh}l6t
public: JF.Lo;
CAboutDlg(); c0@8KW[,
// Dialog Data lS.Adl^k
//{{AFX_DATA(CAboutDlg) c[dzO.~
enum { IDD = IDD_ABOUTBOX }; ]yU"J:/
//}}AFX_DATA }Q/onBt
// ClassWizard generated virtual function overrides AC)
M2;
//{{AFX_VIRTUAL(CAboutDlg) jV3PTU
protected: =^nb+}Nz(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _95296
//}}AFX_VIRTUAL A IP~A]T
// Implementation az(<<2=
protected: PLyity-L[7
//{{AFX_MSG(CAboutDlg) \n)',4mY
//}}AFX_MSG Zh<;r;2
DECLARE_MESSAGE_MAP() )|F|\6:ne
}; +$,Re.WnP
O<gfZ>
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) k&]nF,f
{ Z',!LK!
//{{AFX_DATA_INIT(CAboutDlg) Ma[EgG
//}}AFX_DATA_INIT {3tzr ;c?
} ^/2I)y]W0
@p+;iS1}
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %iN>4;T8
{ Z4j6z>q E
CDialog::DoDataExchange(pDX); zH8E,)
//{{AFX_DATA_MAP(CAboutDlg) fd\RS1[
//}}AFX_DATA_MAP ):D"LC
} ,^#Jw`w^
g{65 QP
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @X2*O9
//{{AFX_MSG_MAP(CAboutDlg) |p11Jt[
// No message handlers -Aj)<KNx[
//}}AFX_MSG_MAP ,kN;d}bg
END_MESSAGE_MAP() #<im?
6[> lzEZ
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !~@GIr
: CDialog(CCaptureDlg::IDD, pParent) UNdD2Fd9
{ Y`|+sND
//{{AFX_DATA_INIT(CCaptureDlg) 5'~_d@M
m_bControl = FALSE; _kj]vbG^;
m_bAlt = FALSE; sHP-@
m_bShift = FALSE; eU?hin@X
m_Path = _T("c:\\"); !'7fOP-J]
m_Number = _T("0 picture captured."); #%0V`BS7n
nCount=0; ~C.*Vc?|
bRegistered=FALSE; h+ f>#O+:
bTray=FALSE; j2Zp#E!
//}}AFX_DATA_INIT $B+| &]a
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *Z5^WHwg
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [VCC+_
} tZrc4$D-
/:&!o2&1H
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l>?c AB[
{ p*Bty@CRi
CDialog::DoDataExchange(pDX); I2ek`t]
//{{AFX_DATA_MAP(CCaptureDlg) &|>+LP@8
DDX_Control(pDX, IDC_KEY, m_Key); 24mdhT|
DDX_Check(pDX, IDC_CONTROL, m_bControl); lfGyK4:
DDX_Check(pDX, IDC_ALT, m_bAlt); C$3*[
DDX_Check(pDX, IDC_SHIFT, m_bShift); T(4d5 fY
DDX_Text(pDX, IDC_PATH, m_Path); ]T4/dk&|o^
DDX_Text(pDX, IDC_NUMBER, m_Number); kIrrbD
//}}AFX_DATA_MAP qS!r<'F3dP
} )?L=o0
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i=8iK#2 h
//{{AFX_MSG_MAP(CCaptureDlg) @=Kq99=\U
ON_WM_SYSCOMMAND() }{aGh I~<
ON_WM_PAINT() R$awg SE
ON_WM_QUERYDRAGICON() IP~!E_e}\
ON_BN_CLICKED(ID_ABOUT, OnAbout) ^4y]7p
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;SR ESW
ON_BN_CLICKED(ID_CHANGE, OnChange) ])x1MmRg\
//}}AFX_MSG_MAP j]a$RC#
END_MESSAGE_MAP() vh9* >[i
=P-&dN
BOOL CCaptureDlg::OnInitDialog() XZ
rI w
{ v0^9"V:y
CDialog::OnInitDialog(); LSo!_tY
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \u3\ TJ
ASSERT(IDM_ABOUTBOX < 0xF000); Pf?kNJ*Tv)
CMenu* pSysMenu = GetSystemMenu(FALSE); *dzZOe>,
if (pSysMenu != NULL) E*_^+ %
{ mYBEjZB
CString strAboutMenu; /'O8RUjN
strAboutMenu.LoadString(IDS_ABOUTBOX); ^
k^y|\UtZ
if (!strAboutMenu.IsEmpty()) 97}]@xN=
{ ) "#'
pSysMenu->AppendMenu(MF_SEPARATOR); [\uR3$j#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); g|=_@
pL
} WA{igj@\
} ?Cq7_rq
SetIcon(m_hIcon, TRUE); // Set big icon ntiS7g e1
SetIcon(m_hIcon, FALSE); // Set small icon T X`X5j
m_Key.SetCurSel(0); xS18t="
RegisterHotkey(); 3:%k
pnO
CMenu* pMenu=GetSystemMenu(FALSE); j jpYg
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *OVB;]D3+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6 Z/`p~e
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;`9f<d#\
return TRUE; // return TRUE unless you set the focus to a control N!A20Bv
} tiK?VwaKI
s>rR\`
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ejRK-!
{ ajbe7#}
if ((nID & 0xFFF0) == IDM_ABOUTBOX) i jI/z5
{ )oEVafNsT
CAboutDlg dlgAbout; -!\3;/
dlgAbout.DoModal(); h\m35'v!
} *P()&}JK
else NOz3_k
{ @0`A!5h?u
CDialog::OnSysCommand(nID, lParam); TFVQfj$r
} :dmE/Tq
} FR(W.5[
=O/Bte.
void CCaptureDlg::OnPaint() vNv?trw
{
fF:57*ys
if (IsIconic()) -F[8ZiZ
{ ^s,3*cAU
CPaintDC dc(this); // device context for painting yr]ja-Y
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \}-4(Xdaq
// Center icon in client rectangle y)f.ON36I
int cxIcon = GetSystemMetrics(SM_CXICON); !`ol&QQ#
int cyIcon = GetSystemMetrics(SM_CYICON); 1I Yip\:lS
CRect rect; Pms@!yce
GetClientRect(&rect); w$gvgz
int x = (rect.Width() - cxIcon + 1) / 2; R^Rc!G}
int y = (rect.Height() - cyIcon + 1) / 2; `i{d"H0E
// Draw the icon B`tq*T%
dc.DrawIcon(x, y, m_hIcon); y48]|%73
} a|ft l&uk
else KaIKb=4L|
{ e~h>b.~
CDialog::OnPaint(); owVvbC2<b(
} H$6RDMU
} wNONh`b
,'NasL8?We
HCURSOR CCaptureDlg::OnQueryDragIcon() .^YxhUH,G
{ p_r` "
return (HCURSOR) m_hIcon; $QX$r N
} @xG&K{j
Z\$HgG
void CCaptureDlg::OnCancel() uL'f8Pqg
{ N_t,n^i9>*
if(bTray) (1/Sf&2i
DeleteIcon(); OhF55,[
CDialog::OnCancel(); DF%d/a{]
} 3)OZf{D[
`CK~x=
void CCaptureDlg::OnAbout() uf(ayDE
{ VA/2$5Wu
CAboutDlg dlg; $Dg-;I
dlg.DoModal(); Rq4;{a/j
} >Wg=
Tuef
Y#U.9>h
void CCaptureDlg::OnBrowse() 9t! d.}
{ ?y>N&\pt2
CString str; g/?Vl2W
BROWSEINFO bi; j*=!M# D
char name[MAX_PATH]; @uSO~.7
ZeroMemory(&bi,sizeof(BROWSEINFO)); Jcw^Z,
bi.hwndOwner=GetSafeHwnd(); 6#w>6g4V~R
bi.pszDisplayName=name; ktu?-?#0,
bi.lpszTitle="Select folder"; RK# 6JfC3X
bi.ulFlags=BIF_RETURNONLYFSDIRS; !E70e$Th
LPITEMIDLIST idl=SHBrowseForFolder(&bi); B`pBIUu
if(idl==NULL) cJKnB!iL5
return; UhB+c
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?7\V)$00(&
str.ReleaseBuffer(); UG1<Xfu|
m_Path=str; ,f03TBD}
if(str.GetAt(str.GetLength()-1)!='\\') OM'iJB6=
m_Path+="\\"; 8jK=A2pTa
UpdateData(FALSE); glAS$<
} ZlV
e8,_"_1:F
void CCaptureDlg::SaveBmp() "tEp8m
{ 7KtU\u
CDC dc; gt4GN`-k
dc.CreateDC("DISPLAY",NULL,NULL,NULL); /4{WT?j
CBitmap bm; ITPE2x
int Width=GetSystemMetrics(SM_CXSCREEN); ?o<vmIge
int Height=GetSystemMetrics(SM_CYSCREEN); z$ ^d_)
bm.CreateCompatibleBitmap(&dc,Width,Height); So5/n7
CDC tdc; 7o4E_ .*
tdc.CreateCompatibleDC(&dc); O{ :{P5
CBitmap*pOld=tdc.SelectObject(&bm); Y A.&ap
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I=`? 4%
tdc.SelectObject(pOld); &9jJ\+:7
BITMAP btm; -:}vf?
bm.GetBitmap(&btm); G/x6zdk
DWORD size=btm.bmWidthBytes*btm.bmHeight; ,@Csa#
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;W0J
BITMAPINFOHEADER bih; 0 '&C5v'
bih.biBitCount=btm.bmBitsPixel; g%2G=gR$?z
bih.biClrImportant=0; lM-\:Q!
bih.biClrUsed=0; cGot0' mB
bih.biCompression=0; deVd87;@7[
bih.biHeight=btm.bmHeight; }OkzP)(
bih.biPlanes=1; .0Ud?v>=
bih.biSize=sizeof(BITMAPINFOHEADER); 6:_~-xG
bih.biSizeImage=size; 3mgvWR
bih.biWidth=btm.bmWidth; vc#o(?g
bih.biXPelsPerMeter=0; b[vE!lJEq
bih.biYPelsPerMeter=0; Rtf<UhUn
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u5CSx'h]
static int filecount=0; I0-1Hr
CString name; Kq7r+A
name.Format("pict%04d.bmp",filecount++); L5hF-Ek!
3
name=m_Path+name; z$<=8ox8e
BITMAPFILEHEADER bfh; A;!5c;ftj,
bfh.bfReserved1=bfh.bfReserved2=0; L1IF$eC
bfh.bfType=((WORD)('M'<< 8)|'B'); 1$Up7=Dr=
bfh.bfSize=54+size; BKFO^
bfh.bfOffBits=54; at>_EiS
CFile bf; T*p7[}#
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _ep&`K
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); lw=kTYbq
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); LcKc#)'EE
bf.WriteHuge(lpData,size); g}9,U&$]y
bf.Close(); lyL6w1
nCount++; 6O4*OR<&
} iBE|6+g~Cj
GlobalFreePtr(lpData); DLwlA!z
if(nCount==1) HoBx0N9\2
m_Number.Format("%d picture captured.",nCount); XT0-"-q
else |dIR v
m_Number.Format("%d pictures captured.",nCount); ;5X6`GlS#5
UpdateData(FALSE); +;,{`*W+N
} '[
c-$X2Ak
^P^"t^O
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) AA-$;s
{ $$AZ)#t[
if(pMsg -> message == WM_KEYDOWN) 3P_.SF
{ 1@Ba7>%'
if(pMsg -> wParam == VK_ESCAPE) H c/7x).
return TRUE; e`Yj}i*bx]
if(pMsg -> wParam == VK_RETURN) h!B{7J
return TRUE; -O})Y>=}
} $GoS?\G
return CDialog::PreTranslateMessage(pMsg); j,rc9
} c{'Z.mut
1dD%a91
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) MpKXC
{ F%L"Q>aHW
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Eu|/pH=:
SaveBmp(); fMwF|;
return FALSE; qJ" (:~
} FC 8<D
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zBm~ J%
CMenu pop; Vc\g"1x
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); clDn=k<
CMenu*pMenu=pop.GetSubMenu(0); mjOxmwo
pMenu->SetDefaultItem(ID_EXITICON); /}u:N:HA%
CPoint pt; j'*.=cwsp
GetCursorPos(&pt); %>&~?zrq
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H_g]q
if(id==ID_EXITICON) ImQ-kz?b
DeleteIcon(); 4#t'1tzu#
else if(id==ID_EXIT) &"u(0q
OnCancel(); 7Kym|Zg
return FALSE; 7$7|~k
} !19T=p/:$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -cUW,>E
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :] Wn26z)
AddIcon(); "]^U(m>f
return res; w !kk(QMV
} +sJ{9# 6
fe\'N4
void CCaptureDlg::AddIcon() 3SM'vV0[
{ A._CCou
NOTIFYICONDATA data; xK8m\=#
data.cbSize=sizeof(NOTIFYICONDATA); NO/$}vw
CString tip; C,,T7(: k
tip.LoadString(IDS_ICONTIP); ^uX"04>;
data.hIcon=GetIcon(0); +4J'> dr
data.hWnd=GetSafeHwnd(); X6sZwb
strcpy(data.szTip,tip); -0uGzd+m*
data.uCallbackMessage=IDM_SHELL; A?tCa*b^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; H#F"n"~$
data.uID=98; ks$5$,^T2o
Shell_NotifyIcon(NIM_ADD,&data); <F`9;WX
ShowWindow(SW_HIDE); 2SU'lh\E
bTray=TRUE; lC*xyOK
} tL&_@PD)3
.KYs5Qu
void CCaptureDlg::DeleteIcon() +%CXc%
{ *3^7'^j<
NOTIFYICONDATA data; H94_a e
data.cbSize=sizeof(NOTIFYICONDATA); ,!SbH
data.hWnd=GetSafeHwnd(); ; 8VZsh
data.uID=98; `?:{aOI
Shell_NotifyIcon(NIM_DELETE,&data); [/ CB1//Y
ShowWindow(SW_SHOW); !d0$cF):
SetForegroundWindow(); &=zJ MGa
ShowWindow(SW_SHOWNORMAL); 0"-H34M<D
bTray=FALSE; D _\HX9
} SdufI_'B
AU*]D@H
void CCaptureDlg::OnChange() daY0;,>
{ M|y!,/'
RegisterHotkey(); MPp:EH
} (*26aMp
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BOOL CCaptureDlg::RegisterHotkey() q.:a4w J
{ 2+|r*2_glo
UpdateData(); Gj#BG49g2
UCHAR mask=0; )p!")
:'fv
UCHAR key=0; >yyu:dk-;
if(m_bControl) mGz'%?zj
mask|=4; sS)tSt{C
if(m_bAlt) zv1,DnkqF
mask|=2; $IKN7
if(m_bShift) bq7()ocA
mask|=1; M#o=.,
key=Key_Table[m_Key.GetCurSel()]; Q0PqyobD
if(bRegistered){ C _W]3
DeleteHotkey(GetSafeHwnd(),cKey,cMask); hAi'|;g
bRegistered=FALSE; fk#Ggp<
} 4P2p|Gc3
cMask=mask; ),<h6$
cKey=key; (1,4egMpR
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); uxrNkZia
return bRegistered; 4pDZ +}p
} Kd#64NSi$A
PHsM)V+
四、小结 NFU=PS$
JjAO9j%
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。