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:
T8mY#^sW_
omT(3)TP 一、实现方法
F%y{%
C7l QP<FCmt8 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:
6.UKB<sV 1::LN(`< #pragma data_seg("shareddata")
K
/8qB~J* HHOOK hHook =NULL; //钩子句柄
J2=*-O: UINT nHookCount =0; //挂接的程序数目
/6smVz@O static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
A{t"M-< static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Fi/jR0]e2 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
[{/$9k-aF? static int KeyCount =0;
)ZeLaa P static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
79a9L{gso #pragma data_seg()
n8Q*
_?Z/ p*!q}%U 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
<YSg~T ,.q8Xf DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
[Q=4P*G}X m"q/,}DR BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
}eI`Qg cKey,UCHAR cMask)
CCn/ udp@ {
lf;~5/%wMG BOOL bAdded=FALSE;
b<8q 92F for(int index=0;index<MAX_KEY;index++){
>07shNX if(hCallWnd[index]==0){
>waN;&>/ hCallWnd[index]=hWnd;
k5g@myb- HotKey[index]=cKey;
.h a`)@MsZ HotKeyMask[index]=cMask;
;i}i5yv2
bAdded=TRUE;
bbO+%-(X KeyCount++;
8Y7 @D$=w break;
{DSyV: }
6G$/NW=L }
t+jIHo return bAdded;
hO%Y{Gg }
we
}#Ru* //删除热键
Hl!1h% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
G}s;JJax {
Q^vGj</u BOOL bRemoved=FALSE;
SC]6F* for(int index=0;index<MAX_KEY;index++){
7
s7}?l9 if(hCallWnd[index]==hWnd){
\A ;^ UxG if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
C1n??Y[ hCallWnd[index]=NULL;
ZHb7+ HotKey[index]=0;
F@Pem HotKeyMask[index]=0;
R2SBhs,+R bRemoved=TRUE;
4Sqvhz KeyCount--;
^z38<L=z" break;
zv`zsqDJ }
CJ0$;et }
nhp)yW }
x
Ridc^ return bRemoved;
%;'~%\|dZM }
B%) zGTp6 QXsfp :l4^iSf DLL中的钩子函数如下:
ysL0hwir j-j'ph K LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
RFhU# {
gYRqqV BOOL bProcessed=FALSE;
MPqY?KF if(HC_ACTION==nCode)
m9%yR"g9 {
{`tHJ|8 if((lParam&0xc0000000)==0xc0000000){// 有键松开
vY4WQbz( switch(wParam)
0PR4g}" {
|&9tU case VK_MENU:
l.sm~/ MaskBits&=~ALTBIT;
]~$c~*0g break;
gv`%Z8u( case VK_CONTROL:
U`:l AG MaskBits&=~CTRLBIT;
8u4gx<;O break;
q$bHO case VK_SHIFT:
i?lX,9% MaskBits&=~SHIFTBIT;
/DK*yS break;
zUe#Wp[ default: //judge the key and send message
Tw?Pp8' break;
Rd`{qW }
=7*oC for(int index=0;index<MAX_KEY;index++){
Dm&lSWW`/ if(hCallWnd[index]==NULL)
e6Wl7&@6 continue;
f S(^["*G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6'S5sRA {
w2.qT+;v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
": mCZUt bProcessed=TRUE;
8''9@xz }
<{3q{VW* }
7Ntjx(b$"h }
s$K@X ` else if((lParam&0xc000ffff)==1){ //有键按下
z?8zFP switch(wParam)
J,CJPUf& {
/+Wb6{lY case VK_MENU:
Dh*~U:6$g MaskBits|=ALTBIT;
n P0Ziu'{ break;
C~3@M<X case VK_CONTROL:
B)_!F`9 MaskBits|=CTRLBIT;
E|KLK4] break;
>^M!@=/?J case VK_SHIFT:
mABwM$_ MaskBits|=SHIFTBIT;
?FkQe~FN{ break;
N:m@D][/sW default: //judge the key and send message
<|mE9u break;
,e}mR>i=e }
*?EjYI for(int index=0;index<MAX_KEY;index++){
fx8y`8}_ if(hCallWnd[index]==NULL)
ZE5-i@1 continue;
2<`gs(oxXe if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|6\FI? {
V2WUM+`uT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-MVNXAKnZ bProcessed=TRUE;
; |E! |w }
^EnNbFI }
wFKuSd }
r*~n` if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
'[7C~r{% for(int index=0;index<MAX_KEY;index++){
l4R<`b\Jt if(hCallWnd[index]==NULL)
k1~nd=p continue;
JKEXYE if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
3.K{T SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$Hl+iF4j< //lParam的意义可看MSDN中WM_KEYDOWN部分
2Be ?5+ }
JsWq._O{/ }
-Ib+#pX }
auyKLT3C return CallNextHookEx( hHook, nCode, wParam, lParam );
?-RoqF }
1OfSq1G>v$ c:`` Y: 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:
B~'VDOG$Z yP1Y3Tga= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
~t.WwxY+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/I`bh r=iMo7q 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
'!r+Tz iA^+/Lt LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
8-y: == C {
K@$L~G if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
qD=m{O8%_ {
'o#J>a~!9L //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
AD!<%h: SaveBmp();
+ 8K1]'t$ return FALSE;
ac+k 5K+ }
I[cV"BDa …… //其它处理及默认处理
nDoiG#N0 }
HqnKpZ N8MlT \+r #?b^B~ # 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。
&[2Ej|o C&CsI] @g 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。
|)72E[lL KWn1 %oGJ 二、编程步骤
#ejw@bd CL@h!h554_ 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";
bsk=9K2_2t /i~^LITH 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
*3etxnQc mB|mt+ 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;
]zwqG A rO?x/{;ai 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;
tMPXvE BHJ'[{U*w 5、 添加代码,编译运行程序。
x 1x j\O =`\,2Nb 三、程序代码
b#I*~ >2Qqa;nx| ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<K=B(-~ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
z)Q^j>% #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
kFIB lPV #if _MSC_VER > 1000
^tKOxW#
a #pragma once
?#EXG #endif // _MSC_VER > 1000
J"2ODB5" #ifndef __AFXWIN_H__
FG5c:Ep #error include 'stdafx.h' before including this file for PCH
HT,kx #endif
h3d\MYO)B #include "resource.h" // main symbols
g=YiR/O1QN class CHookApp : public CWinApp
zyp"*0zUr {
72`/xryY public:
[ls ?IFg CHookApp();
xm10 // Overrides
% 6hw // ClassWizard generated virtual function overrides
Y7t{4P //{{AFX_VIRTUAL(CHookApp)
hte9l) public:
c>i*HN}Z| virtual BOOL InitInstance();
;Y|~!%2~ virtual int ExitInstance();
AIxBZt7{b //}}AFX_VIRTUAL
gUszMhHX //{{AFX_MSG(CHookApp)
\Af|$9boHz // NOTE - the ClassWizard will add and remove member functions here.
On.x~t // DO NOT EDIT what you see in these blocks of generated code !
xE-c9AH //}}AFX_MSG
GWqY$YT DECLARE_MESSAGE_MAP()
dK;\`>8 };
jme5'FR LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
3
cW"VrFy9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
g\{! 21M BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:k )<1ua BOOL InitHotkey();
eZod}~J8 BOOL UnInit();
ocuVDC #endif
UrcN? PUZXmnB //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
F%+rOT<5 #include "stdafx.h"
6u, 0y$3 #include "hook.h"
"QFADk1 #include <windowsx.h>
AB&wn>q #ifdef _DEBUG
|m 5;M$M) #define new DEBUG_NEW
?!
_pP| #undef THIS_FILE
E e\-q static char THIS_FILE[] = __FILE__;
)4_6\VaM #endif
.yfqS|( #define MAX_KEY 100
w$;*~Qc #define CTRLBIT 0x04
r=H\4%P4 #define ALTBIT 0x02
2au(8IWu #define SHIFTBIT 0x01
m3xj5]#^$ #pragma data_seg("shareddata")
?M-8Fp3 + HHOOK hHook =NULL;
^\kHEM|5v UINT nHookCount =0;
(`y|AOs static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
y3[)zv static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
b
G5 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
*;yMD-= static int KeyCount =0;
o4 g static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{ZM2WFpE #pragma data_seg()
zu*G4?]~h HINSTANCE hins;
e, 0I~: void VerifyWindow();
6ym)F!t8l BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
jzA8f+:q //{{AFX_MSG_MAP(CHookApp)
s1\BjSzk // NOTE - the ClassWizard will add and remove mapping macros here.
G{Enh<V // DO NOT EDIT what you see in these blocks of generated code!
d~Ry> //}}AFX_MSG_MAP
y^46z(I END_MESSAGE_MAP()
Cl.T'A$ Heif FJn CHookApp::CHookApp()
wBHDof
xX {
LLY;IUK!R // TODO: add construction code here,
'CO[s.03 // Place all significant initialization in InitInstance
HgATH }
*=9#tYn~ b-zX3R; CHookApp theApp;
Ib8{+j LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
RZh)0S>J {
OwIy(ukTI BOOL bProcessed=FALSE;
6%INNIyAWa if(HC_ACTION==nCode)
d@f2Vxe7 {
@CI6$ if((lParam&0xc0000000)==0xc0000000){// Key up
]]o[fqD-Zn switch(wParam)
"[S
6w {
B]F7t4Y! case VK_MENU:
*+Q*&-$ MaskBits&=~ALTBIT;
9ufs6z break;
%ys}Q!gR case VK_CONTROL:
[]!r|R3 MaskBits&=~CTRLBIT;
Z|S7", break;
U?j> 28 case VK_SHIFT:
5w{pX1z1 MaskBits&=~SHIFTBIT;
*Y0,d`
break;
<1.mm_pw default: //judge the key and send message
-%)
!XB
break;
;O|63 }
dKTAc":-} for(int index=0;index<MAX_KEY;index++){
`2+e\%f/0 if(hCallWnd[index]==NULL)
HWOH8q{f! continue;
K61os&K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
N4jLbnA {
BQ0\+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
R>&/n/l bProcessed=TRUE;
M
F: Eu }
0w. _}Cz }
xumv I{ }
"1Aus else if((lParam&0xc000ffff)==1){ //Key down
8mLU ~P
| switch(wParam)
4PM`hc {
`3oP^# case VK_MENU:
:?k=Yr MaskBits|=ALTBIT;
mJR
T+SZ break;
#'h CohL case VK_CONTROL:
}?kO<)d MaskBits|=CTRLBIT;
q:sR zX break;
Vp{2Z9]} case VK_SHIFT:
[V0 h9! MaskBits|=SHIFTBIT;
%pQ o%<d break;
2<@!m@ default: //judge the key and send message
695ppiKU break;
!T. @ }
vGT.(:\-, for(int index=0;index<MAX_KEY;index++)
kk+8NwM1 {
C~V$G}mM if(hCallWnd[index]==NULL)
a`Zf_;$@ continue;
toJ&$HrE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Pv.@Y30 {
o|q#A3%? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S6tH!Z=(g bProcessed=TRUE;
:K:gyVrC }
.Kwl8xRg }
]_8 \g`"u }
3y ,?>- if(!bProcessed){
Z"+!ayA7D for(int index=0;index<MAX_KEY;index++){
", ) if(hCallWnd[index]==NULL)
i%8 sy continue;
@ R Bw T if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:zRboqe(cc SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
hz<J8'U }
qG]PUc>j }
e|yuPd }
1tpD| return CallNextHookEx( hHook, nCode, wParam, lParam );
[Cp{i<C }
y8z%s/gRh &}1)]6q$ BOOL InitHotkey()
L{p-'V {
ht9b=1wd%s if(hHook!=NULL){
H]X)@n> nHookCount++;
j3&*wU_ return TRUE;
Q4q#/z }
?9TogW>W else
e*H$c?7NL hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
}*.*{I if(hHook!=NULL)
_AYF'o-Cm nHookCount++;
>.\E'e5^C return (hHook!=NULL);
M7 !"
t }
q|J] BOOL UnInit()
BUyA] {
--kK<9J7 if(nHookCount>1){
P\e%8&_U/ nHookCount--;
>`'9V|1 return TRUE;
a~>h'}C> }
n]Y _C^ BOOL unhooked = UnhookWindowsHookEx(hHook);
}DaYO\:yK* if(unhooked==TRUE){
sf0U(XYQ^ nHookCount=0;
GNOC5 E$I hHook=NULL;
O]lfs>>x }
nT"z(\i.!J return unhooked;
8F1!9W7 }
e_TDO 7<D_ h/WV BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2wQ
CQ" {
>qA&;M BOOL bAdded=FALSE;
]mA?TwD for(int index=0;index<MAX_KEY;index++){
U w" if(hCallWnd[index]==0){
%>TdTt hCallWnd[index]=hWnd;
`l#g`~L HotKey[index]=cKey;
5Y^YKV{ HotKeyMask[index]=cMask;
)3sb2
# bAdded=TRUE;
mN02T@R- KeyCount++;
+$5^+C\6A break;
K<GCP2 }
NY
x4&
*le }
t/|^Nt@XT return bAdded;
l1WVt} }
>kYyR.p.b S}X:LHr* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4NV1v&" {
S##W_OlrI BOOL bRemoved=FALSE;
)A%Y
wI$ for(int index=0;index<MAX_KEY;index++){
G>x0}c if(hCallWnd[index]==hWnd){
~55>uw< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
`2B+8,{% hCallWnd[index]=NULL;
BxF HotKey[index]=0;
)
|vFrR HotKeyMask[index]=0;
soF ^G21N bRemoved=TRUE;
g 7X>i: KeyCount--;
,dBI=D' break;
m='OnTeOE }
4<|u~n*JF }
{SV$fl; }
zdCt#=QV?R return bRemoved;
-eTGRr }
dyd_dK/ 7(H/|2;-d8 void VerifyWindow()
zYgLGwi{ {
zeX?]@]Y for(int i=0;i<MAX_KEY;i++){
GCHssw~P'v if(hCallWnd
!=NULL){ yFG&Ir
if(!IsWindow(hCallWnd)){ ?t-2oLE
hCallWnd=NULL; bX,Z<BvbF
HotKey=0; x%1Rp[
HotKeyMask=0; M3%<kk-_
KeyCount--; V QI7lJV"
} ;G$FLL1
} Cb.Aw!
} fJuJ#MX{:
} JFfx9%Fq
R<-KXT9
BOOL CHookApp::InitInstance() &3<]FK
{ +Q.[W`goV
AFX_MANAGE_STATE(AfxGetStaticModuleState()); M:x(_Lu
hins=AfxGetInstanceHandle(); I$$!YMm.N
InitHotkey(); ;XT$rtuX
return CWinApp::InitInstance(); _
0-YsD
} tBrVg<]t
F~EriO
int CHookApp::ExitInstance() k.%F!sK
{ m`Z4#_s2
VerifyWindow(); 8Xr"4;}f+
UnInit(); C}CX n X
return CWinApp::ExitInstance(); R##O9BSI8Z
} y03l_E,
HM/ qB^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;\h'A(
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8g\.1<~
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _>s.V`N'
#if _MSC_VER > 1000 eX\t]{\oC
#pragma once #ed]zI9O
#endif // _MSC_VER > 1000 6*$N@>8&
_wIAr
class CCaptureDlg : public CDialog fw<'ygd
{ ^#+9v
// Construction /=%4gWtr
public: XIU2l}g
BOOL bTray; lG2){){j
BOOL bRegistered; gb-n~m[y
BOOL RegisterHotkey(); a`}-^;}SW
UCHAR cKey; !T}`h'
UCHAR cMask; 7r>^_ aW
void DeleteIcon(); pxgv(:Tw
void AddIcon(); ;k>{I8L~
UINT nCount; FXbNmBXF
void SaveBmp(); D3eK!'qS
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Js'|N%pi
// Dialog Data >QYxX<W
//{{AFX_DATA(CCaptureDlg) @I%m}>4Jm
enum { IDD = IDD_CAPTURE_DIALOG }; b+kb7
CComboBox m_Key; X:YxsZQ5Y
BOOL m_bControl; E>&dG:3no
BOOL m_bAlt; q;rU}hAzG0
BOOL m_bShift; ^VA)vLj@
CString m_Path; _Q QO&0Z
CString m_Number; =&vV$UtV
//}}AFX_DATA YPN|qn(
// ClassWizard generated virtual function overrides 4WLB,<b}
//{{AFX_VIRTUAL(CCaptureDlg) /SyiJCx0
public: s;bqUY?LD
virtual BOOL PreTranslateMessage(MSG* pMsg); BzDS
protected: T6tJwSS4:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bcQ$S;U)
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U9Sp$$L
//}}AFX_VIRTUAL dG1qrh9_-
// Implementation Rcu/ @j{O
protected: {|qz>
HICON m_hIcon; cB|](gWS~
// Generated message map functions 9vXrC_W9
//{{AFX_MSG(CCaptureDlg) s;>jy/o0 s
virtual BOOL OnInitDialog(); , =#'?>Kq
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ox58L>:0m
afx_msg void OnPaint(); EM"YjC)F
afx_msg HCURSOR OnQueryDragIcon(); #6JG#!W
virtual void OnCancel(); /gxwp:&lY
afx_msg void OnAbout(); Zvc{o8^z
afx_msg void OnBrowse(); \hg12],#:@
afx_msg void OnChange(); xk#/J]j
//}}AFX_MSG !aLL|}S
DECLARE_MESSAGE_MAP() T7[ItLZ
}; 4]Krx
m`8
#endif C@xh$(y
86[TBX5'
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file TtHqdKL
#include "stdafx.h" o_?YYw-:
#include "Capture.h" -q[?,h
#include "CaptureDlg.h" 7uYJ_R
#include <windowsx.h> bEM-^SR
#pragma comment(lib,"hook.lib") h9No'!'!
#ifdef _DEBUG O `*}N1No[
#define new DEBUG_NEW *edB3!!
#undef THIS_FILE ondF
static char THIS_FILE[] = __FILE__; nP] ~8ViS
#endif 'En 6h" {
#define IDM_SHELL WM_USER+1 \ZXH(N*>2t
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]2?t$"G8
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z O&5C6qa
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =YR/|9(
class CAboutDlg : public CDialog 9\V^q9l
{ }yUZ(k#
public: b*7OIN5h
CAboutDlg(); <~'\~Z d+
// Dialog Data >=wlS\:"
//{{AFX_DATA(CAboutDlg) TeQpmhN
enum { IDD = IDD_ABOUTBOX }; QD<f)JZK
//}}AFX_DATA H.*XoktC]
// ClassWizard generated virtual function overrides _E3*;
//{{AFX_VIRTUAL(CAboutDlg) >-f`mT
protected: k\A8Z[
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]"^U
//}}AFX_VIRTUAL q* +}wP
// Implementation Ve<l7U;
protected: fVw+8 [d0
//{{AFX_MSG(CAboutDlg) $`mxOcBmQ
//}}AFX_MSG fs\l*nBig
DECLARE_MESSAGE_MAP() +[ !K
}; LyH{{+V
\It8+^d@
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F8f@^LVM/
{ @a+1Ri`)
//{{AFX_DATA_INIT(CAboutDlg) L'.7V ~b{
//}}AFX_DATA_INIT I6~.sTl
} =
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Y`w+?}(M
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _uID3N%
{ *zJ}=%)f
CDialog::DoDataExchange(pDX); e+j7dmGa
//{{AFX_DATA_MAP(CAboutDlg) .hXxh)F
//}}AFX_DATA_MAP W-2,QVp%
} YhRES]^
|X0h-kX4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UO>ADRs}
//{{AFX_MSG_MAP(CAboutDlg) m!V ?xGKJ
// No message handlers `$7.(.#s
//}}AFX_MSG_MAP uPhFBD7
END_MESSAGE_MAP() :>] =YE
4u0=/pfi[
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gh#9<
: CDialog(CCaptureDlg::IDD, pParent) xx_]e4
{ g ?qm >X
//{{AFX_DATA_INIT(CCaptureDlg)
pO[ @2tF
m_bControl = FALSE; x[zt(kC0+
m_bAlt = FALSE; D:4Iex9$F"
m_bShift = FALSE; (w}iEm\b
m_Path = _T("c:\\"); )[i0~o[
m_Number = _T("0 picture captured."); W$=Ad *
nCount=0; W{<_gD9
bRegistered=FALSE; &]iiBp#2
bTray=FALSE; B/6wp^#VX
//}}AFX_DATA_INIT 1^jGSB.%A
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 yHsmX2s
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,3 =|a|p
} INZsDM 9
A\X?Aq-^'
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) :XqqhG
{ W1fEUVj
CDialog::DoDataExchange(pDX); @@M
2s(
//{{AFX_DATA_MAP(CCaptureDlg) rOHU)2
DDX_Control(pDX, IDC_KEY, m_Key); J'jwRn
DDX_Check(pDX, IDC_CONTROL, m_bControl); kr[p4X4
DDX_Check(pDX, IDC_ALT, m_bAlt); ux:czZqy
DDX_Check(pDX, IDC_SHIFT, m_bShift); @z[,w`
DDX_Text(pDX, IDC_PATH, m_Path); 0Z$=2c?xT
DDX_Text(pDX, IDC_NUMBER, m_Number); K-vG5t0$\/
//}}AFX_DATA_MAP rl"$6{Z}
} CY"&@v1
ssj(-\5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I&%{%*y
//{{AFX_MSG_MAP(CCaptureDlg) VC$,Y
ON_WM_SYSCOMMAND() ~gg(i"V
ON_WM_PAINT() {}RE;5n\['
ON_WM_QUERYDRAGICON() PT4Wox9U
ON_BN_CLICKED(ID_ABOUT, OnAbout) 6aRPm%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bis}zv^%v
ON_BN_CLICKED(ID_CHANGE, OnChange) {xJq F4
//}}AFX_MSG_MAP v,Eqn8/O
END_MESSAGE_MAP() dY[ XNP
Z\c^CN
BOOL CCaptureDlg::OnInitDialog() _$g6Mj]1z
{ iZm#
"}VG
CDialog::OnInitDialog(); 4LO4SYW7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YW9r'{(D(I
ASSERT(IDM_ABOUTBOX < 0xF000); B8_)I.
CMenu* pSysMenu = GetSystemMenu(FALSE); WZ,}]D
if (pSysMenu != NULL) Vz_ac
vfk^
{ b|jdYJbol&
CString strAboutMenu; IsP-[0it
strAboutMenu.LoadString(IDS_ABOUTBOX); J8IdQ:4^l
if (!strAboutMenu.IsEmpty()) P5-1z&9O
{ 0se0AcrW
pSysMenu->AppendMenu(MF_SEPARATOR); A8tzIh8
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3*INDD=
} {<$ D|<S
} %8C,9q
SetIcon(m_hIcon, TRUE); // Set big icon d^b(Uo=$
SetIcon(m_hIcon, FALSE); // Set small icon max 5s$@
m_Key.SetCurSel(0); TNun)0p
RegisterHotkey(); +pMa-{
CMenu* pMenu=GetSystemMenu(FALSE); Zfwhg4G~
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); vfBIQfH
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v_=xN^R
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }#'I,?_k
return TRUE; // return TRUE unless you set the focus to a control f0"N
} LelCjC{`1
b~$B0o)
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $r> $
u
{ 0
]K\G55
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "$P|!k45(
{ gbf2ty
CAboutDlg dlgAbout; Yvmo%.oU
dlgAbout.DoModal(); Z/
w}so
} CcDmZ
else kD"BsL*6!
{ Qk`ykTS!
CDialog::OnSysCommand(nID, lParam); `eZ
+Pf".
} -!_\4
} 1=o|[7
`wGP31Y.
void CCaptureDlg::OnPaint() ,^Ug[pGG-
{ ^ &UezDTS
if (IsIconic()) '2LK(uaU
{ H| UGR~&
CPaintDC dc(this); // device context for painting 8nV#\J9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); t?&@bs5~g
// Center icon in client rectangle EuH[G_5e0
int cxIcon = GetSystemMetrics(SM_CXICON); 7tZvz `\
int cyIcon = GetSystemMetrics(SM_CYICON); XHN*'@
77;
CRect rect; $!Qv f
GetClientRect(&rect); WF#3'"I
int x = (rect.Width() - cxIcon + 1) / 2; yZHh@W4v
int y = (rect.Height() - cyIcon + 1) / 2; NCu:E{([
// Draw the icon cpY'::5.%
dc.DrawIcon(x, y, m_hIcon); 0XgJCvMcB
} +O]jklS4H
else J~jxmh
{ 322)r$!"
CDialog::OnPaint(); N"',
} nO;*Peob
} O\~/J/u
<
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HCURSOR CCaptureDlg::OnQueryDragIcon() D6Q6yNE
{ 5>S=f{ghFw
return (HCURSOR) m_hIcon; ng0tNifZ;
} pYxdE|2j
76'@}wNnw
void CCaptureDlg::OnCancel() V?[dg^*0
{ aB$xQ|~
if(bTray) mKTa.
DeleteIcon(); PQ0l <]Y
CDialog::OnCancel(); ,V`zW<8
} [<0\v<{`L
\N|ma P
void CCaptureDlg::OnAbout() #.j[iN
:+
{ JXhHitUD
CAboutDlg dlg; j Z6]G{
dlg.DoModal(); B)L=)N
} {?+dVLa^;
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void CCaptureDlg::OnBrowse() Q:v9C ^7
{ B8G9V6KS-
CString str; e6
&-f
BROWSEINFO bi; sJ3O ]
char name[MAX_PATH]; xPcH]Gs^b
ZeroMemory(&bi,sizeof(BROWSEINFO)); J$+K't5BZ
bi.hwndOwner=GetSafeHwnd(); U??T>
bi.pszDisplayName=name; =!R+0
bi.lpszTitle="Select folder"; FS+v YqwK
bi.ulFlags=BIF_RETURNONLYFSDIRS; !dcGBj
LPITEMIDLIST idl=SHBrowseForFolder(&bi); |0wHNRN_
if(idl==NULL) !kpnBgm U
return; ^7p>p8
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3Yb2p!o
str.ReleaseBuffer(); ZH
s' #
m_Path=str; <T^:`p/]4
if(str.GetAt(str.GetLength()-1)!='\\') I\y=uC
m_Path+="\\"; [V2`t'
UpdateData(FALSE); <+r<3ZBA
} QBD\2VR
{y\5 9
void CCaptureDlg::SaveBmp() _=g;K+%fb
{ yG/_k!{9
CDC dc; _v\L'`bif
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Vi:<W0:
CBitmap bm; wI{ED
int Width=GetSystemMetrics(SM_CXSCREEN); 6@X j
int Height=GetSystemMetrics(SM_CYSCREEN); O_~vl m<#
bm.CreateCompatibleBitmap(&dc,Width,Height); C)H1<Br7
CDC tdc; 0*4h}t9j
tdc.CreateCompatibleDC(&dc); um5n3=K
CBitmap*pOld=tdc.SelectObject(&bm); h ycdk1SN
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QPZ|C{Ce
tdc.SelectObject(pOld); Vmb `%k20'
BITMAP btm; p$+.]
bm.GetBitmap(&btm); wF\5 X
DWORD size=btm.bmWidthBytes*btm.bmHeight; QE\t}>
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }
N$soaUs
BITMAPINFOHEADER bih; j~#nJI5]
bih.biBitCount=btm.bmBitsPixel; 9{(A-
bih.biClrImportant=0; DtRu&>o_6D
bih.biClrUsed=0; s0/[mAY
bih.biCompression=0; bAkCk]>5
bih.biHeight=btm.bmHeight; ]A#K;AW{U
bih.biPlanes=1; "4Bk
bih.biSize=sizeof(BITMAPINFOHEADER); \~4IOu
bih.biSizeImage=size; +#wh`9[wBt
bih.biWidth=btm.bmWidth; $p?TE8G
bih.biXPelsPerMeter=0; 24; BY'
bih.biYPelsPerMeter=0; gQ8FjL6?
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4r+s"
|
static int filecount=0; &X%vp?p
CString name; E4;@P']`
name.Format("pict%04d.bmp",filecount++); :,~]R,tJQ
name=m_Path+name; 7wA.:$
BITMAPFILEHEADER bfh; xn BL{
[]
bfh.bfReserved1=bfh.bfReserved2=0; O)EA2`)E
bfh.bfType=((WORD)('M'<< 8)|'B'); Ug~]!L
bfh.bfSize=54+size; m,1Hlp
bfh.bfOffBits=54; W6y-~
CFile bf; um}%<Cy[
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Z<A BK`rEO
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R>#BJ^>=
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wusj;v4C4M
bf.WriteHuge(lpData,size); _
!r]**
bf.Close(); 65g"$:0
nCount++; 7#G8qh<
} 8
mFy9{M
GlobalFreePtr(lpData); <,\Op=$l3I
if(nCount==1) NW
AT"
m_Number.Format("%d picture captured.",nCount); 9`8D Ga
else R32A2Ml
m_Number.Format("%d pictures captured.",nCount); KN\*|)
UpdateData(FALSE); #J_+
SL[
} !\(j[d#
%7vjYvo>
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Jp#Onl+d6
{ @5tW*:s
if(pMsg -> message == WM_KEYDOWN) ZPO+ #,
{ $eQf 5)5
if(pMsg -> wParam == VK_ESCAPE) ynQ+yW74Z
return TRUE; 83[gV@LW0m
if(pMsg -> wParam == VK_RETURN) $bdtiD
return TRUE; a|5^4 J\%
} >anq1Kf
return CDialog::PreTranslateMessage(pMsg); u.~`/O
} O
S%
4
>2g&);B
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -l2aAK1M
{ J 6%CF2
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Dmq_jt
SaveBmp(); !YZ$WiPl
return FALSE; WNo",Vc
} L?:fyNA3[
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `rQDX<?
CMenu pop; TTQ(\l4
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rV[/G#V>{
CMenu*pMenu=pop.GetSubMenu(0); 5+yT{,(5
pMenu->SetDefaultItem(ID_EXITICON); 1v2pPUH\
CPoint pt; zc4l{+3
GetCursorPos(&pt); 6%Ws>H4@|
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "%[a Wb
if(id==ID_EXITICON) |u5Xi5q.f
DeleteIcon(); T x
6\
else if(id==ID_EXIT) g6V>_|
OnCancel(); "gQA|NHwV
return FALSE; 5U[bn=n
} 1:Dm,d;
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 48p< ~#<W\
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8-clL\bm
AddIcon(); Uk0Fo(HY
return res; \]$TBN
dJ4
} +ia N[F$
{%PgR){qR
void CCaptureDlg::AddIcon() {EL
J!o[
{ |tua*zEsS
NOTIFYICONDATA data; M
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data.cbSize=sizeof(NOTIFYICONDATA); JrA\ V=K
CString tip; \[MQJX,dn
tip.LoadString(IDS_ICONTIP); g$a
5
data.hIcon=GetIcon(0); '|~L9t
data.hWnd=GetSafeHwnd(); L2P#5B!S
strcpy(data.szTip,tip); *s[bq;$
data.uCallbackMessage=IDM_SHELL; 3^x
C=++
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; bxFDB^
data.uID=98; PZB_6!}2[F
Shell_NotifyIcon(NIM_ADD,&data); "(cMCBVYdA
ShowWindow(SW_HIDE); E3`&W8
bTray=TRUE; z($h7TZ$
} )(`HEl>-9c
n+q a/<
void CCaptureDlg::DeleteIcon() _G1C5nkDl4
{ *\4u :1Cu
NOTIFYICONDATA data; xzrA%1y
data.cbSize=sizeof(NOTIFYICONDATA);
{=A8kgt
data.hWnd=GetSafeHwnd(); yD\[`!sWk
data.uID=98; VHlo}Ek<#
Shell_NotifyIcon(NIM_DELETE,&data); `j1(GQt
ShowWindow(SW_SHOW); ?V>{3
SetForegroundWindow(); !^m,v19Ds<
ShowWindow(SW_SHOWNORMAL); S(MVL!Lm
bTray=FALSE; x}(p\Efx
} 1 ^q~NYTK
trAIh}Dj
void CCaptureDlg::OnChange() Uc>$w?oA
{ ~Q36lR
RegisterHotkey(); C;BC@OE
} $EUlh^
[L4s.l_#
BOOL CCaptureDlg::RegisterHotkey() |WMP_sGn
{ g2t'u4>
UpdateData(); sPoH12?AL
UCHAR mask=0; *!p#1fE
UCHAR key=0; rJ 7yq|^Z
if(m_bControl) 4y$tp18
mask|=4; OEwKT7CX
if(m_bAlt) q\q8xF~[p
mask|=2; .*acw
if(m_bShift) 8&2W^f5
mask|=1; EKTn$k=
key=Key_Table[m_Key.GetCurSel()]; "1X@t'H38
if(bRegistered){ gI5" \"T{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); IP3%'2}-
bRegistered=FALSE; uFH ]w]X
} Q
xg)Wb#
cMask=mask; E%tGwbi7
cKey=key; (I7s[
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W2 p&LP
return bRegistered; 1w|C+m/(
} oBqWIXM
6OOdVS3\J
四、小结 Kp.d#W_TX
y?4%eD
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。