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:
e\7AtlW"
f'WRszrF 一、实现方法
> f*-9 089 <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:
w}WfQj epm ~ #pragma data_seg("shareddata")
s$D" HHOOK hHook =NULL; //钩子句柄
!+V."*]l UINT nHookCount =0; //挂接的程序数目
T jrz_o) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
qvC 2BQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
9@^N*
E+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
>z|bQW#2 static int KeyCount =0;
s^R$u"pFs static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
!~_6S*~ #pragma data_seg()
<Eu/f`8 >Hwf/Gf[ 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。
9
M90X8 #DA ,* 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:
3S=$ng 044Q>Qz, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
OD6dMql cKey,UCHAR cMask)
cyH=LjgJf {
KSve_CBOh BOOL bAdded=FALSE;
=:=s for(int index=0;index<MAX_KEY;index++){
9ePR6WS4 if(hCallWnd[index]==0){
cXIuGvE&= hCallWnd[index]=hWnd;
4Dw|
I${O HotKey[index]=cKey;
_T(77KLn; HotKeyMask[index]=cMask;
5 D[`nU} bAdded=TRUE;
_5/3RN
KeyCount++;
? ]H'egG6 break;
%4x,^ K] }
R,+"^:} }
\F9HsR6 return bAdded;
TUX:[1~Nf[ }
;]VLA9dC //删除热键
IXU~&5&J BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Mi<}q@]e {
:Tdl84 BOOL bRemoved=FALSE;
B*^8kc:)L for(int index=0;index<MAX_KEY;index++){
*qKf!& if(hCallWnd[index]==hWnd){
yHs'E4V`$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
|k<5yj4? hCallWnd[index]=NULL;
ge[&og/$ HotKey[index]=0;
]D@y""{--s HotKeyMask[index]=0;
fO}Y$y\q bRemoved=TRUE;
4`p[t;q KeyCount--;
s@K #M break;
BFPy~5W }
Q32GI,M%B }
l-q.VY2 }
mU;\,96# return bRemoved;
G\Q0{4w8 }
fH 0&Wc3yC bdyIt)tK+ , R $ZZ4 DLL中的钩子函数如下:
k7=mxXF 84y#L[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Wa'm]J {
aZL
FsSY BOOL bProcessed=FALSE;
|\/V1 if(HC_ACTION==nCode)
a WMEo`O% {
F2CoXe7 if((lParam&0xc0000000)==0xc0000000){// 有键松开
+\~Mx>Cn switch(wParam)
K2ry@haN {
u
=|A case VK_MENU:
?Q/9aqHe; MaskBits&=~ALTBIT;
22"/|S break;
nX-%qc" case VK_CONTROL:
Ng1uJa[k!d MaskBits&=~CTRLBIT;
usOIbrQ break;
gfU!sYZ case VK_SHIFT:
q/^&si MaskBits&=~SHIFTBIT;
Q~G>=J9 break;
]z5gC`E0 default: //judge the key and send message
a[Oi break;
m'ykDK\B }
+)-`$N for(int index=0;index<MAX_KEY;index++){
~U_,z)<`)c if(hCallWnd[index]==NULL)
3NC-)S continue;
y1+~IjY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
i*Ee(m]I {
Zv)x-48 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
mLL?n) bProcessed=TRUE;
1U< g }
FT.;}!"l }
Z}4
`y"By }
:,BKB*a\ else if((lParam&0xc000ffff)==1){ //有键按下
(
mKuFz7 switch(wParam)
cG~-OHU {
Ye) F{WqZ# case VK_MENU:
h?ZxS MaskBits|=ALTBIT;
#iAEcC0k5 break;
%#,EqN case VK_CONTROL:
uGMmS9v$ J MaskBits|=CTRLBIT;
)I`Ma6bX break;
>g FEA0- case VK_SHIFT:
QSq0{ MaskBits|=SHIFTBIT;
+nT(>RJR break;
^E(:nxQ6s default: //judge the key and send message
(5(TbyWwD break;
8RJ^e[?o( }
a@&P\"k for(int index=0;index<MAX_KEY;index++){
- r!sY+Z> if(hCallWnd[index]==NULL)
$D)Ajd; continue;
a2'f#[as if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
EFNi# D8s {
]1(G:h\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
QZs ]'*=# bProcessed=TRUE;
=~f\m:Y }
#[C=LGi }
z nxAP| }
da/Tms`T if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
IDIok~B=e for(int index=0;index<MAX_KEY;index++){
C[xY 0<^B if(hCallWnd[index]==NULL)
t+?m<h6w;l continue;
.!pr0/9B if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Ghb Jty` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
^Voi4; //lParam的意义可看MSDN中WM_KEYDOWN部分
{5,
]7 =] }
]'iOV-2^' }
R@8pKCL. }
Z/f%$~Ch return CallNextHookEx( hHook, nCode, wParam, lParam );
o'SZsG }
'M'k$G@Z V|n}v?f_q 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:
p&nPzZQL( Fb0r(vQ^ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>{HQ"{Q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
C3"5XR_Ov ;n~-z5) 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:
%A^V@0K3 $%P?2g"j, LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
CVy\']
{
#@3&1}J/ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
:+qd>;yf# {
2]}4)_&d<e //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
~Bi>T15e SaveBmp();
iX|K4.Pz{ return FALSE;
{)?:d6" }
^tTASK …… //其它处理及默认处理
+>}LT_ }
d^(7\lw| w5+H9R6 3HEm-pok 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
o^ zrF X;&Iu{&= 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
*t%Z'IA <%iRa$i5 二、编程步骤
SIridZ*% 2if7|o$= 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
cTJi8f=g RH}i= 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
[p+-]V 9,wD 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
,6EhtNDu 9$?Sts}6& 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;
akA7))Q ;p+[R+ ) 5、 添加代码,编译运行程序。
mPL0s l+A)MJd oj 三、程序代码
vR3\E"Zi }6_*i!68"U ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
dfP4SJqq
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
x:K~?c3 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
s(Bcw`'# #if _MSC_VER > 1000
`y|_hb #pragma once
BPuum #endif // _MSC_VER > 1000
(Z0_e&=* #ifndef __AFXWIN_H__
u*T(n s
l #error include 'stdafx.h' before including this file for PCH
\$4 [qG= #endif
,g pZz$Ef( #include "resource.h" // main symbols
_a#k3r class CHookApp : public CWinApp
PU,%Y_xR {
lvsj4cT public:
Y}]-o9Rl CHookApp();
V3>tW,z // Overrides
Z)}UCi+/". // ClassWizard generated virtual function overrides
^)(-7H //{{AFX_VIRTUAL(CHookApp)
fX.1=BjXi public:
Fw S>V2R virtual BOOL InitInstance();
5a-x$Qb9 virtual int ExitInstance();
s&hr$`V4 //}}AFX_VIRTUAL
h
8xcq# //{{AFX_MSG(CHookApp)
g#MLA5%=u // NOTE - the ClassWizard will add and remove member functions here.
pM^Z C // DO NOT EDIT what you see in these blocks of generated code !
s+?2oPa //}}AFX_MSG
-&COI-P8 DECLARE_MESSAGE_MAP()
RA!q)/+ };
MkL) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Z}TLk^_[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
F"bz<{ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z %Bzf~N9 BOOL InitHotkey();
rlaeqG BOOL UnInit();
QgI[#d{ #endif
.faf!3d f4
qVUU //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
RC/45:hZZ #include "stdafx.h"
*E*oWb]H #include "hook.h"
XC5/$3'M& #include <windowsx.h>
EJ>&\Iq #ifdef _DEBUG
sO`
oapy #define new DEBUG_NEW
2j:0!% #undef THIS_FILE
c}+*$DeT static char THIS_FILE[] = __FILE__;
M+0PEf. #endif
f"KrPx!^b #define MAX_KEY 100
Z6rhInIY #define CTRLBIT 0x04
jM&di #define ALTBIT 0x02
f-G)pHm #define SHIFTBIT 0x01
4 sax #pragma data_seg("shareddata")
puJB&u"4L HHOOK hHook =NULL;
o]~\u{o#. UINT nHookCount =0;
D3yTN" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
~W [I static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
!(rAI static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
8f/KNh7#s static int KeyCount =0;
4SZ,X^]I> static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
t&xoi7!$ #pragma data_seg()
>Jmla~A HINSTANCE hins;
&yvvea] void VerifyWindow();
X58U>4a BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
{_Wrs.a'8 //{{AFX_MSG_MAP(CHookApp)
%(1OjfZc // NOTE - the ClassWizard will add and remove mapping macros here.
cvaG[NF // DO NOT EDIT what you see in these blocks of generated code!
B=!!R]dxA //}}AFX_MSG_MAP
J(l\VvK END_MESSAGE_MAP()
4LKpEl.= GLn=*Dh# CHookApp::CHookApp()
Sv T0%2 {
/@F'f@; // TODO: add construction code here,
AP=h*1udk // Place all significant initialization in InitInstance
&em~+83 }
-67Z!N k1<^Ept CHookApp theApp;
byxlC?q7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
2%sZaM {
taE
p BOOL bProcessed=FALSE;
]>1Mq,! if(HC_ACTION==nCode)
{ c#US {
i%-yR DIX if((lParam&0xc0000000)==0xc0000000){// Key up
8>9Mh!t}(I switch(wParam)
=&z+7Pe[ {
d}\]!x3t case VK_MENU:
~.:{
Ik] MaskBits&=~ALTBIT;
E`o_R=% break;
V: D;?$Jl case VK_CONTROL:
7|5kak>= MaskBits&=~CTRLBIT;
]q1w@)]n} break;
k|/VNV( =0 case VK_SHIFT:
CPJ21^ MaskBits&=~SHIFTBIT;
SE+hB break;
V
vrsf6l] default: //judge the key and send message
,<U=
7<NU break;
#yochxF_ }
EHwb?{ for(int index=0;index<MAX_KEY;index++){
!-lI<$S: if(hCallWnd[index]==NULL)
0`x>p6.)G continue;
K=N&kda if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
rRRh-%.RU {
IU8zidn& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
|8'}mjs.Q bProcessed=TRUE;
Qn$'bK2V }
th{f|fm62 }
OkciL] }
h"1}j'2>@ else if((lParam&0xc000ffff)==1){ //Key down
8xLQ"
l+" switch(wParam)
-s0SQe{!_ {
hl:Ba2_E
+ case VK_MENU:
!0l|[c4 e> MaskBits|=ALTBIT;
Q#% LIkeq break;
{ 4j<X5V case VK_CONTROL:
zeMV_rW~ MaskBits|=CTRLBIT;
z\|<h=EU break;
8XH;<z<oJ case VK_SHIFT:
JP Dxzp MaskBits|=SHIFTBIT;
x<l 5wh break;
"o--MBq4 default: //judge the key and send message
oO
tjG3B({ break;
j0L%jz }
NuO@Nr for(int index=0;index<MAX_KEY;index++)
oc"p5Y3,Os {
I;XM4a if(hCallWnd[index]==NULL)
D\G 8p; continue;
0")_% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<2(X?,N5BD {
1Lf - SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1jx?zvE, bProcessed=TRUE;
>(2;(TbQm0 }
A5R"|<UPR }
gkK(7=r% }
Ge)G.> c if(!bProcessed){
J)g
+I for(int index=0;index<MAX_KEY;index++){
Z84w9y7O< if(hCallWnd[index]==NULL)
I_B%F#X) continue;
D Z~036 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
@^0}w k SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
s {*rBX8N }
9uxoMjR- }
/\ fR6|tJ }
&4wSX{c/P return CallNextHookEx( hHook, nCode, wParam, lParam );
VnN(lJ }
~e|E5[-i 5#z7Hj&w BOOL InitHotkey()
Vb\^xdL> {
l )r^|9{ if(hHook!=NULL){
fhk(<KZvJ nHookCount++;
([m4dr return TRUE;
6oWFj eZ0 }
]@_|A, ] else
rhF2U hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
ZHRMW'Ne if(hHook!=NULL)
e<DcuF<ZS nHookCount++;
C^?/9\
return (hHook!=NULL);
U7LCd+Z5X }
-4Q\FLC'k BOOL UnInit()
<&+0[9x {
u$qasII if(nHookCount>1){
O>*Vo!z\f nHookCount--;
V%*91t _ return TRUE;
[$6YPM>Ee }
KfK5e{yT BOOL unhooked = UnhookWindowsHookEx(hHook);
$LBgBH&z if(unhooked==TRUE){
\0*dKgN nHookCount=0;
Gp_flGdGQ hHook=NULL;
a U<+ ` }
P(\x. d: return unhooked;
6XAofN/5f }
&i805,lx cr18`xU BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
M )v='O<H8 {
2L.6!THG BOOL bAdded=FALSE;
29z@ ! for(int index=0;index<MAX_KEY;index++){
\+
Ese-la if(hCallWnd[index]==0){
`OZiN;*| hCallWnd[index]=hWnd;
{rF9[S"h HotKey[index]=cKey;
y2B'0l HotKeyMask[index]=cMask;
sVlQ5M oo( bAdded=TRUE;
H ~<.2b KeyCount++;
IUG}Q7w5 break;
;Rxc(tR!n }
*I9O63 }
%xXb5aY return bAdded;
^%1u3 }
K,bX<~e5 %4wHiCOg BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MHCwjo" {
YvUV9qps~ BOOL bRemoved=FALSE;
DRVvC~M-, for(int index=0;index<MAX_KEY;index++){
WQ{^+C9g'1 if(hCallWnd[index]==hWnd){
p8iKZI]g if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
*y~~~ 'J/ hCallWnd[index]=NULL;
2p *!up( HotKey[index]=0;
B;<zA' 1 HotKeyMask[index]=0;
Eh *u6K)Z bRemoved=TRUE;
?%T]V+40 KeyCount--;
9
H>JS break;
6anH#=( }
r+a0. }
C)cuy7< }
=s:Z-*vy! return bRemoved;
z|<?=c2P }
0<Rq #,SPV& void VerifyWindow()
}?6gj%$c {
\5#eBJ for(int i=0;i<MAX_KEY;i++){
Z>.(' if(hCallWnd
!=NULL){ #_'^oGz`
if(!IsWindow(hCallWnd)){ LP>GM=S#"
hCallWnd=NULL; ,H]S-uK~
HotKey=0; W#L/|K!S
HotKeyMask=0; `cFNO:
KeyCount--; Cv<
s|
} wYd{X 8$
} %\1W0%w
} 3g3Znb
} p%+'iDb
WFfn:WSWU
BOOL CHookApp::InitInstance() cE*d(g
{ 3oApazH*
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5?>ES*
hins=AfxGetInstanceHandle(); K#x|/b'5d
InitHotkey(); j^m pkv<P
return CWinApp::InitInstance(); ,a":/ /[
} tf>"fU\P
CE|rn8MB
int CHookApp::ExitInstance() V17!~
{ 4
udW6U
VerifyWindow(); 4V'HPD>=V
UnInit(); ,HK-mAH
return CWinApp::ExitInstance(); }(9ZME<(
} (JT
273
:CP,DO
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file B|r'
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wB"`lY
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X?'pcYSL
#if _MSC_VER > 1000 [G"Va_A8
#pragma once kTm}VTr
1
#endif // _MSC_VER > 1000 /sdZf|Zl
G|z%T`!U1;
class CCaptureDlg : public CDialog 1YtK+,mz
{ "-Wb[*U;
// Construction /])P{"v$^
public: ">vi=Tr
BOOL bTray; +.QJZo_
BOOL bRegistered; H'&[kgnQ@
BOOL RegisterHotkey(); ;KT5qiqYH
UCHAR cKey; ~,.;2K73
UCHAR cMask; N t\ZM
void DeleteIcon(); &mm!UJ
void AddIcon(); x7/";L>
UINT nCount; U+&Eps&NI
void SaveBmp(); gmZ] E45
CCaptureDlg(CWnd* pParent = NULL); // standard constructor >+):eBL
// Dialog Data z#2n+hwE
//{{AFX_DATA(CCaptureDlg) od^ylg>K
enum { IDD = IDD_CAPTURE_DIALOG }; TQ=HFs
~
CComboBox m_Key; y2=yh30L0E
BOOL m_bControl; Gr#WD=I-}
BOOL m_bAlt; 9+3 VK
BOOL m_bShift; Rx?ze(
CString m_Path; 'UM *7
CString m_Number; -F MonM
//}}AFX_DATA jwP5pu
// ClassWizard generated virtual function overrides ^!gq_x
//{{AFX_VIRTUAL(CCaptureDlg) "uFwsjz&B
public: 9*r^1PRc
virtual BOOL PreTranslateMessage(MSG* pMsg); Nnq1&j"m
protected: nu(7YYCM$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }_5 R9w]"
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); B<0Kl.V
//}}AFX_VIRTUAL w^U{e
xo
// Implementation ij;P5OA
protected: c3r`T{Kf
HICON m_hIcon; bF5"ab0
// Generated message map functions +wxsAGy_j
//{{AFX_MSG(CCaptureDlg) 7Gy:T47T\@
virtual BOOL OnInitDialog(); CP0'pL=;
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); W1EYVXN
afx_msg void OnPaint(); qG ? :Q
afx_msg HCURSOR OnQueryDragIcon(); ]Y!x7
virtual void OnCancel(); pdvnpzj
afx_msg void OnAbout(); ~]q>}/&YLo
afx_msg void OnBrowse(); Dp!91NgB p
afx_msg void OnChange(); z+- o}i
//}}AFX_MSG ,~DV0#"
DECLARE_MESSAGE_MAP() um}q @BU
}; Eku9u
#endif tym:C7v%~
lRb>W31"
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Id&e'
#include "stdafx.h" imeE&
#include "Capture.h" `G_~zt/
#include "CaptureDlg.h" eLnS1w2
#include <windowsx.h> qR_>41JU"
#pragma comment(lib,"hook.lib") =*"8N-FU
#ifdef _DEBUG S0QLM)
#define new DEBUG_NEW .Z
67
#undef THIS_FILE Fxc_s/^=t
static char THIS_FILE[] = __FILE__; 6 dV )pJd
#endif D>-r `
#define IDM_SHELL WM_USER+1 QS5t~rb
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8-B7_GoJ+B
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1^^8,.'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; b^Re947{g
class CAboutDlg : public CDialog @uldD"MJ<]
{ 6-fv<Pn
public: d?T!)w
CAboutDlg(); -1RMyVx
// Dialog Data KE@+I.x
//{{AFX_DATA(CAboutDlg) Uq$/Q7
enum { IDD = IDD_ABOUTBOX }; Dzf\m>H[
//}}AFX_DATA )38%E;T{X
// ClassWizard generated virtual function overrides fg3Jv*
//{{AFX_VIRTUAL(CAboutDlg) OtmDZ.t;`
protected: YLGE{bS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hHU=lnO
//}}AFX_VIRTUAL tVEe) QX
// Implementation ,>h"~X
protected: R`Z"ey@C
//{{AFX_MSG(CAboutDlg) !>n!Q*\(Ov
//}}AFX_MSG A5TSbW']+5
DECLARE_MESSAGE_MAP() e,/]]E/o
}; E|"SMA,
H3<tsK=:
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {pIh/0
{ Z%]K,9K
//{{AFX_DATA_INIT(CAboutDlg) HS/.H,X
//}}AFX_DATA_INIT A}(]J!rc
} w\o6G7
u,So+%
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1vj@qw3
{ 8%#8PLB2
CDialog::DoDataExchange(pDX); eTvWkpK+
//{{AFX_DATA_MAP(CAboutDlg) V%r`v%ktF
//}}AFX_DATA_MAP S
F*C'
} ,s #~00C|
"dX~J3$
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {x_.QWe5
//{{AFX_MSG_MAP(CAboutDlg) e=OHO,74z"
// No message handlers KHML!f=mu
//}}AFX_MSG_MAP ?f"5yQ-B
END_MESSAGE_MAP() sip4,>,E
<J&S[`U!
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~4{q
: CDialog(CCaptureDlg::IDD, pParent) )OV0YfO
{ ^[xcfTN
//{{AFX_DATA_INIT(CCaptureDlg) #y:D{%Wp
m_bControl = FALSE; '6dVe2V
m_bAlt = FALSE; [ ulub|
m_bShift = FALSE; 9E2iZt]
m_Path = _T("c:\\"); 4f[%Bb
m_Number = _T("0 picture captured."); 7EE{*}?0E
nCount=0; .C%
28fH
bRegistered=FALSE; Z
v@nK%#J
bTray=FALSE; \FVfV`x
//}}AFX_DATA_INIT p0@^1
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 o6[.$C
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d&j
} H{*Dc_
<=*f
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }mj9$=B4
{ 1|MRXK
CDialog::DoDataExchange(pDX); h3CA,$HJ
//{{AFX_DATA_MAP(CCaptureDlg) pmNy=ZXx
DDX_Control(pDX, IDC_KEY, m_Key); t%lat./yT
DDX_Check(pDX, IDC_CONTROL, m_bControl); YExgUE|
DDX_Check(pDX, IDC_ALT, m_bAlt); 'o-4'
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~lw9sm*2v2
DDX_Text(pDX, IDC_PATH, m_Path); g_Z
tDxz
DDX_Text(pDX, IDC_NUMBER, m_Number); ,|]JaZq
//}}AFX_DATA_MAP b7QE
} *LEy#N
{~U3|_"[pX
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) pE5v~~9Ikv
//{{AFX_MSG_MAP(CCaptureDlg) 3Z
b]@n
ON_WM_SYSCOMMAND() |./mPV r
ON_WM_PAINT() [;u#79aE
ON_WM_QUERYDRAGICON() q)k:pQ
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3z8i0
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) W7S~~
ON_BN_CLICKED(ID_CHANGE, OnChange) JusU5 e|
//}}AFX_MSG_MAP %fj5;}E.
END_MESSAGE_MAP() T`&zQQ6F'
xlI=)ak{
BOOL CCaptureDlg::OnInitDialog() j6m;03<|
{ 6_j |@
CDialog::OnInitDialog(); yb`PMj j15
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); en<~_|J
ASSERT(IDM_ABOUTBOX < 0xF000); _ \D%
CMenu* pSysMenu = GetSystemMenu(FALSE); 0fsVbC
if (pSysMenu != NULL) cLtVj2Wb
{ 39X~<\&'
CString strAboutMenu; 7UfNz60+~
strAboutMenu.LoadString(IDS_ABOUTBOX); s4|\cY`b-
if (!strAboutMenu.IsEmpty()) *1)>He$qL
{ ![_x/F9
pSysMenu->AppendMenu(MF_SEPARATOR); >i/jqT/
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); QNNURf\[(
} H1bR+2s
} ]fyfL|(;
SetIcon(m_hIcon, TRUE); // Set big icon owAO&"C
SetIcon(m_hIcon, FALSE); // Set small icon #HUn~r
m_Key.SetCurSel(0); .biq)Le
RegisterHotkey(); 7Uenr9)M
CMenu* pMenu=GetSystemMenu(FALSE); At Wv9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a|ufm^F
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 98[uRywI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I
]m
return TRUE; // return TRUE unless you set the focus to a control |2(q9j
} - x
SQodk:1)
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mQ[$U
{ qmrT dG
if ((nID & 0xFFF0) == IDM_ABOUTBOX) >xFvfuyC
{ `[/#,*\
CAboutDlg dlgAbout; Xaq;d'
dlgAbout.DoModal(); ;4F6
$T'I
} M:+CW;||!
else ?@64gdlwq
{ \6b~$\~B
CDialog::OnSysCommand(nID, lParam); xGd60"w2
} _7c3=f83
} vX+oZj
+f3Rzx]
void CCaptureDlg::OnPaint() 3[m~-8
{ g4?2'G5m?
if (IsIconic()) bC{4a_B
{ Al$z.i?R
CPaintDC dc(this); // device context for painting 0z8(9DlTc
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'HA{6v,y
// Center icon in client rectangle Y{Z&W9U
int cxIcon = GetSystemMetrics(SM_CXICON); ,KY;NbL-Jp
int cyIcon = GetSystemMetrics(SM_CYICON); E|O&bUMh
CRect rect; hRkCB
GetClientRect(&rect); P\U<,f
int x = (rect.Width() - cxIcon + 1) / 2; b?~p/[
int y = (rect.Height() - cyIcon + 1) / 2; -gn0@hS0
// Draw the icon 4_#$k{
dc.DrawIcon(x, y, m_hIcon); c`O~I<(Pm
} s:T%,xS
else -&/?&{Q0
{ "x,lL
CDialog::OnPaint(); .$U,bE
} N_Us6X
} V)$!WPL@
, ZsZzZ#
HCURSOR CCaptureDlg::OnQueryDragIcon() N[{rsUBd
{ Wt.DL mO
return (HCURSOR) m_hIcon; |Ajd$+3
} UP](1lAf
Qz(D1>5I?
void CCaptureDlg::OnCancel() 9*"
{ Tmg C {_
if(bTray) x@#>l8k?
DeleteIcon(); u>>|ZPe
CDialog::OnCancel(); a%#UF@I
} }7.A~h
V,r~%p
void CCaptureDlg::OnAbout() cU;Bm}U
{ VDxm|7
CAboutDlg dlg; jz!I +
dlg.DoModal(); l*ltS(?
} C4m+Ta%
b(K"CL\p
void CCaptureDlg::OnBrowse() 6wlLE5
{ 1AJ6NBC&c
CString str; 80nE QT
y
BROWSEINFO bi; /&gg].&2?
char name[MAX_PATH]; 4Kj.o
ZeroMemory(&bi,sizeof(BROWSEINFO)); k*1Lr\1
bi.hwndOwner=GetSafeHwnd(); b9H(w%7ucU
bi.pszDisplayName=name; :zL)O
bi.lpszTitle="Select folder"; %A zy#m
bi.ulFlags=BIF_RETURNONLYFSDIRS; 3lF"nv
LPITEMIDLIST idl=SHBrowseForFolder(&bi); !2t7s96
if(idl==NULL) ')jItje|
return; ':.Hz]]/A
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q[OwP
str.ReleaseBuffer(); 0)&!$@HW
m_Path=str; 6A"$9sj6
if(str.GetAt(str.GetLength()-1)!='\\') e#[Klh$]EW
m_Path+="\\"; (.-4Jn
UpdateData(FALSE); O84]J:b
} 7|}4UXr7y
e!VtDJDS
void CCaptureDlg::SaveBmp() }UyQGRZ=
{ eB0exPz%
CDC dc; xs= ~N
dc.CreateDC("DISPLAY",NULL,NULL,NULL); <Km9Mq
CBitmap bm; 9=>q0D2
int Width=GetSystemMetrics(SM_CXSCREEN); 5RPG3ppS
int Height=GetSystemMetrics(SM_CYSCREEN); B&cIx~+
bm.CreateCompatibleBitmap(&dc,Width,Height); G+dq
*/
CDC tdc; sq$v6x sl
tdc.CreateCompatibleDC(&dc); DI\=udN
CBitmap*pOld=tdc.SelectObject(&bm); e)sR$]i:v
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); b
3x|Dq .
tdc.SelectObject(pOld); .n<vhLDQn
BITMAP btm; $zP5Hzx
bm.GetBitmap(&btm); )Do 0
DWORD size=btm.bmWidthBytes*btm.bmHeight; Pb&tWv\ql
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); sK2N3B&6
BITMAPINFOHEADER bih; -6[DQB
bih.biBitCount=btm.bmBitsPixel;
v,<14w
bih.biClrImportant=0; R"W}\0k
bih.biClrUsed=0; <-I69`
bih.biCompression=0; --$* q"
bih.biHeight=btm.bmHeight; ;UQza ]i
bih.biPlanes=1; `Gio
2gl9
bih.biSize=sizeof(BITMAPINFOHEADER); D4VDWv
bih.biSizeImage=size; y_m+&Oe
bih.biWidth=btm.bmWidth; O`Tz^Q/D
bih.biXPelsPerMeter=0; a=2.Y?
bih.biYPelsPerMeter=0; Vk{;g
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zYzV!s2^
static int filecount=0; 6n]+(=
CString name; 3U<m\A1
name.Format("pict%04d.bmp",filecount++); V'vWz`#
name=m_Path+name; `'1g>Ebk0
BITMAPFILEHEADER bfh; d]DV\*v
bfh.bfReserved1=bfh.bfReserved2=0; |5 V0_79
bfh.bfType=((WORD)('M'<< 8)|'B'); y[m,t}gi
bfh.bfSize=54+size; ` aVp#
bfh.bfOffBits=54; ^oi']O
CFile bf; <r}wQ\F#
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >9H^r\
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^_]ZZin
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +d3|Up8=
bf.WriteHuge(lpData,size); sF{~7IB
bf.Close(); %,\JTN|g|A
nCount++; J?o
} qb? <u
GlobalFreePtr(lpData); !
I:N<
if(nCount==1) kX8C'D4 gX
m_Number.Format("%d picture captured.",nCount); ZJ3g,dc
else -#ZvjEaey
m_Number.Format("%d pictures captured.",nCount); PYCN3s#Gi
UpdateData(FALSE); w;lpJB\
} /h>g-zb
z:\9t[e4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p@jw)xI
{ i<Z%
if(pMsg -> message == WM_KEYDOWN) B|m)V9A%-
{ &J3QO%
if(pMsg -> wParam == VK_ESCAPE) 3RaduN]
return TRUE; AR[m+E
if(pMsg -> wParam == VK_RETURN) u`'"=Y_E
return TRUE; E0ED[d,
} ^8
VW$}
return CDialog::PreTranslateMessage(pMsg); }a;xs};X;
} R1zt6oY
#Y=^4 U`
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gH//@`6
{ T]tP!a;K
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +p%3pnj:K
SaveBmp(); syw1Z*WK
return FALSE; |Y
uf/G%/
} d"XZlEV
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ t'U=K>7
CMenu pop; @1*^ttC
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3L&:
CMenu*pMenu=pop.GetSubMenu(0); 3m>YR-n$
pMenu->SetDefaultItem(ID_EXITICON); 7${<u 0((!
CPoint pt; #
55>?
GetCursorPos(&pt); i(.e=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D
/QLp3+o
if(id==ID_EXITICON) <D a-rv8
DeleteIcon(); 6=f)3!=
else if(id==ID_EXIT) =+iY<~8
OnCancel(); qPPe)IM'Sc
return FALSE; =mYf]
PIX
} xSudDhRP
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xl4}S"a
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \B#tB?rA
AddIcon(); W1REF9i){
return res; p]kEH\
sh
} @_do<'a
}#^Cj;
void CCaptureDlg::AddIcon() CzBYH
{ ;+~5XLk
NOTIFYICONDATA data; .`IhxE~mN
data.cbSize=sizeof(NOTIFYICONDATA); Em!- W5*s
CString tip; E&8Nh J
tip.LoadString(IDS_ICONTIP); i)x0]XF
data.hIcon=GetIcon(0); ov+{<0Q
data.hWnd=GetSafeHwnd(); GxhE5f;
strcpy(data.szTip,tip); v6 5C
j2ec
data.uCallbackMessage=IDM_SHELL; 'J?{/O ^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k-ZO/yPo
data.uID=98; w'TAM"D`
Shell_NotifyIcon(NIM_ADD,&data); %M96m
ShowWindow(SW_HIDE); -m^-p
bTray=TRUE; pB:XNkxL
} E
ASnh
/#00'(oD
void CCaptureDlg::DeleteIcon() I~6)
Gk&
{ CQ2vFg3+o
NOTIFYICONDATA data; RZHfT0*jL
data.cbSize=sizeof(NOTIFYICONDATA); s~7a-J
data.hWnd=GetSafeHwnd(); DXf
data.uID=98; "1,*6(;:
Shell_NotifyIcon(NIM_DELETE,&data); 9 :2Bt <q
ShowWindow(SW_SHOW); IP`lx
SetForegroundWindow(); OH/9<T?
ShowWindow(SW_SHOWNORMAL); KPToyCyR1
bTray=FALSE; A}lxJ5h0
} %mQ&pk
as@8L|i*
void CCaptureDlg::OnChange() )+L|<6J XA
{ Gsh9D
RegisterHotkey(); obvE m[x!Z
} f7*Qa!!2p]
:u7BCV|yr
BOOL CCaptureDlg::RegisterHotkey() =K:[26
{ s",Ea*
UpdateData(); Z#}sK5s
UCHAR mask=0; %UI^+:C
UCHAR key=0; j/aJD E(+
if(m_bControl) kEh\@x[
mask|=4; 4ior
if(m_bAlt) ovp/DM
mask|=2; Qhj']>#g
if(m_bShift) 1i#y>fUj
mask|=1; 0PkX- .
key=Key_Table[m_Key.GetCurSel()]; i`+w.zJOH8
if(bRegistered){ J?V$V
>d
DeleteHotkey(GetSafeHwnd(),cKey,cMask); byI"
?
bRegistered=FALSE; %1
)c{7
} dy+A$)gY<
cMask=mask; {]6-,/3UR
cKey=key; -Mr_Ao`E
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); i@9
qp?eb
return bRegistered; 45 ^ Z5t
} gs1yWnSv5
A
l;a~45
四、小结 frcX'M}%
K3mP 6Z#2
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。