我正在使用 QT 检查进程是否正在运行,并且我在 msdn 站点中使用了相同的代码。
它在 Visual Studio 上运行良好,但我在 QT 上运行时遇到了问题。
代码如下:
bool matchProcessName( DWORD processID, std::string processName)
{
TCHAR szProcessName[MAX_PATH] = TEXT(L"notepad.exe");
// Get a handle to the process.
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );
// Get the process name.
if (NULL != hProcess )
{
HMODULE hMod;
DWORD cbNeeded;
if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
&cbNeeded) )
{
GetModuleBaseName( hProcess, hMod, szProcessName,
sizeof(szProcessName)/sizeof(TCHAR) );
}
}
// Compare process name with your string
bool matchFound = !_tcscmp(szProcessName, processName.c_str() );
// Release the handle to the process.
CloseHandle( hProcess );
return matchFound;
}
我得到的错误是这样的:
错误:无法将参数“1”的“TCHAR*”转换为“const char*”到“int strcmp(const char*, const char*)”
我怎样才能在 QT 上完成这项工作?
非常感谢。
更新
我也试过这段代码:
DWORD FindProcessId(char* processName)
{
char* p = strrchr(processName, '\\');
if(p)
processName = p+1;
PROCESSENTRY32 processInfo;
processInfo.dwSize = sizeof(processInfo);
HANDLE processesSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, NULL);
if ( processesSnapshot == INVALID_HANDLE_VALUE )
return 0;
Process32First(processesSnapshot, &processInfo);
if ( !strcmp(processName, processInfo.szExeFile) )
{
CloseHandle(processesSnapshot);
return processInfo.th32ProcessID;
}
while ( Process32Next(processesSnapshot, &processInfo) )
{
if ( !strcmp(processName, processInfo.szExeFile) )
{
CloseHandle(processesSnapshot);
return processInfo.th32ProcessID;
}
}
CloseHandle(processesSnapshot);
return 0;
}
我也收到一个错误:无法将参数“2”的“WCHAR*”转换为“const char*”到“int strcmp(const char*, const char*)”
如果我能让第二种方法起作用,我更喜欢!
再次感谢
最佳答案
与Qt无关
在更新的代码中,PROCESSENTRY32.szExeFile
是一个TCHAR[]
,
即如果定义了宏 _UNCODE
,则为 WCHAR[]
,否则为 char[]
。
所以你必须将你的 char *processName
传输到 TCHAR[]
并使用 _tcscmp(...)
来比较 TCHAR[]
。
修改代码:
#include <Windows.h>
#include <TlHelp32.h>
#include <tchar.h>
#include <Psapi.h>
#include <cstring>
#include <string>
#define MIN(x, y) ((x) > (y)) ? (y) : (x)
void cstringToTCHAR(TCHAR *dst, const char *src, size_t l) {
#if defined(_UNICODE) || defined(UNICODE
mbstowcs(dst, src, l);
#else
memcpy(dst, src, l);
#endif
}
bool matchProcessName( DWORD processID, std::string processName)
{
TCHAR szProcessName[MAX_PATH] = _T("notepad.exe");
// Get a handle to the process.
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );
// Get the process name.
if (NULL != hProcess )
{
HMODULE hMod;
DWORD cbNeeded;
if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
&cbNeeded) )
{
GetModuleBaseName( hProcess, hMod, szProcessName,
sizeof(szProcessName)/sizeof(TCHAR) );
}
}
// Compare process name with your string
TCHAR systemEncodeProcessName[30];
size_t processNameLen = MIN((processName.size() + 1), 30);
cstringToTCHAR(systemEncodeProcessName, processName.c_str(), processNameLen);
bool matchFound = !_tcscmp(szProcessName, systemEncodeProcessName);
// Release the handle to the process.
CloseHandle( hProcess );
return matchFound;
}
DWORD FindProcessId(char* processName) {
char* p = strrchr(processName, '\\');
if(p) {
processName = p+1;
}
PROCESSENTRY32 processInfo;
processInfo.dwSize = sizeof(processInfo);
HANDLE processesSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, NULL);
if (processesSnapshot == INVALID_HANDLE_VALUE) {
return 0;
}
//Transfer char array to TCHAR array.
TCHAR systemEncodeProcessName[30];//Maybe need more or dynamic allocation.
size_t processNameLen = MIN((strlen(processName) + 1), 30);
cstringToTCHAR(systemEncodeProcessName, processName, processNameLen);
Process32First(processesSnapshot, &processInfo);
if (!_tcscmp(systemEncodeProcessName, processInfo.szExeFile)) {
CloseHandle(processesSnapshot);
return processInfo.th32ProcessID;
}
while ( Process32Next(processesSnapshot, &processInfo) ) {
if ( !_tcscmp(systemEncodeProcessName, processInfo.szExeFile) ) {
CloseHandle(processesSnapshot);
return processInfo.th32ProcessID;
}
}
CloseHandle(processesSnapshot);
return 0;
}
更新
在Qt creator(3.3.0)中,_UNICODE
宏在Windows平台下貌似没有,添加即可
DEFINES += _UNICODE
在您的 .pro 文件中,然后运行 qmake && build。
关于c++ - 检查进程是否正在运行 - Windows,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29246124/